Unrated severityNVD Advisory· Published May 28, 2026

CVE-2026-46178

Description

In the Linux kernel, the following vulnerability has been resolved:

RDMA/mlx4: Fix resource leak on error in mlx4_ib_create_srq()

Sashiko points out that mlx4_srq_alloc() was not undone during error unwind, add the missing call to mlx4_srq_free().

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Resource leak in Linux kernel RDMA/mlx4 driver when creating SRQ; missing mlx4_srq_free() on error path.

Vulnerability

In the Linux kernel's RDMA/mlx4 driver, the function mlx4_ib_create_srq() fails to call mlx4_srq_free() when an error occurs after a successful mlx4_srq_alloc(). This results in a resource leak. The bug affects kernel versions prior to the fix commit c5dc30da990045105c9762248d23076223e7878a [1].

Exploitation

An attacker with the ability to create an SRQ (typically requiring root or CAP_NET_ADMIN) can trigger the error path by causing a failure after the allocation, for example by exhausting memory or providing invalid parameters. No user interaction beyond initiating the SRQ creation is needed.

Impact

Each failed SRQ creation leaks the allocated resource, leading to gradual memory exhaustion. Over time, this can cause denial of service (DoS) by depleting system memory. No code execution or privilege escalation is possible.

Mitigation

The fix is included in commit c5dc30da990045105c9762248d23076223e7878a [1], which is part of the stable kernel tree. Users should update to a kernel version containing this commit. No workaround is documented.

References

Making sure you're not a bot!

AI Insight generated on May 28, 2026. Synthesized from this CVE's description and the cited reference URLs; citations are validated against the source bundle.

Affected products

Linux/Kernelllm-fuzzy

Patches

0dbd619716fb

RDMA/mlx4: Fix resource leak on error in mlx4_ib_create_srq()

https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.gitJason GunthorpeApr 28, 2026Fixed in 6.12.88via kernel-cna

commit

2 files changed · +6 −4

drivers/infiniband/hw/mlx4/srq.c+3 −2 modified

diff --git a/drivers/infiniband/hw/mlx4/srq.c b/drivers/infiniband/hw/mlx4/srq.c
index c4cf91235eee3a..68e8b04c538808 100644
--- a/drivers/infiniband/hw/mlx4/srq.c
+++ b/drivers/infiniband/hw/mlx4/srq.c
@@ -193,13 +193,15 @@ int mlx4_ib_create_srq(struct ib_srq *ib_srq,
 	if (udata)
 		if (ib_copy_to_udata(udata, &srq->msrq.srqn, sizeof (__u32))) {
 			err = -EFAULT;
-			goto err_wrid;
+			goto err_srq;
 		}
 
 	init_attr->attr.max_wr = srq->msrq.max - 1;
 
 	return 0;
 
+err_srq:
+	mlx4_srq_free(dev->dev, &srq->msrq);
 err_wrid:
 	if (udata)
 		mlx4_ib_db_unmap_user(ucontext, &srq->db);
-- 
cgit 1.3-korg

drivers/infiniband/hw/mlx4/srq.c+3 −2 modified

diff --git a/drivers/infiniband/hw/mlx4/srq.c b/drivers/infiniband/hw/mlx4/srq.c
index c4cf91235eee3a..68e8b04c538808 100644
--- a/drivers/infiniband/hw/mlx4/srq.c
+++ b/drivers/infiniband/hw/mlx4/srq.c
@@ -193,13 +193,15 @@ int mlx4_ib_create_srq(struct ib_srq *ib_srq,
 	if (udata)
 		if (ib_copy_to_udata(udata, &srq->msrq.srqn, sizeof (__u32))) {
 			err = -EFAULT;
-			goto err_wrid;
+			goto err_srq;
 		}
 
 	init_attr->attr.max_wr = srq->msrq.max - 1;
 
 	return 0;
 
+err_srq:
+	mlx4_srq_free(dev->dev, &srq->msrq);
 err_wrid:
 	if (udata)
 		mlx4_ib_db_unmap_user(ucontext, &srq->db);
-- 
cgit 1.3-korg

e01b8c9286c4

RDMA/mlx4: Fix resource leak on error in mlx4_ib_create_srq()

https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.gitJason GunthorpeApr 28, 2026Fixed in 6.18.30via kernel-cna

commit

2 files changed · +6 −4

drivers/infiniband/hw/mlx4/srq.c+3 −2 modified

diff --git a/drivers/infiniband/hw/mlx4/srq.c b/drivers/infiniband/hw/mlx4/srq.c
index c4cf91235eee3a..68e8b04c538808 100644
--- a/drivers/infiniband/hw/mlx4/srq.c
+++ b/drivers/infiniband/hw/mlx4/srq.c
@@ -193,13 +193,15 @@ int mlx4_ib_create_srq(struct ib_srq *ib_srq,
 	if (udata)
 		if (ib_copy_to_udata(udata, &srq->msrq.srqn, sizeof (__u32))) {
 			err = -EFAULT;
-			goto err_wrid;
+			goto err_srq;
 		}
 
 	init_attr->attr.max_wr = srq->msrq.max - 1;
 
 	return 0;
 
+err_srq:
+	mlx4_srq_free(dev->dev, &srq->msrq);
 err_wrid:
 	if (udata)
 		mlx4_ib_db_unmap_user(ucontext, &srq->db);
-- 
cgit 1.3-korg

drivers/infiniband/hw/mlx4/srq.c+3 −2 modified

diff --git a/drivers/infiniband/hw/mlx4/srq.c b/drivers/infiniband/hw/mlx4/srq.c
index c4cf91235eee3a..68e8b04c538808 100644
--- a/drivers/infiniband/hw/mlx4/srq.c
+++ b/drivers/infiniband/hw/mlx4/srq.c
@@ -193,13 +193,15 @@ int mlx4_ib_create_srq(struct ib_srq *ib_srq,
 	if (udata)
 		if (ib_copy_to_udata(udata, &srq->msrq.srqn, sizeof (__u32))) {
 			err = -EFAULT;
-			goto err_wrid;
+			goto err_srq;
 		}
 
 	init_attr->attr.max_wr = srq->msrq.max - 1;
 
 	return 0;
 
+err_srq:
+	mlx4_srq_free(dev->dev, &srq->msrq);
 err_wrid:
 	if (udata)
 		mlx4_ib_db_unmap_user(ucontext, &srq->db);
-- 
cgit 1.3-korg

c5dc30da9900

RDMA/mlx4: Fix resource leak on error in mlx4_ib_create_srq()

https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.gitJason GunthorpeApr 28, 2026Fixed in 6.6.140via kernel-cna

commit

2 files changed · +6 −4

drivers/infiniband/hw/mlx4/srq.c+3 −2 modified

diff --git a/drivers/infiniband/hw/mlx4/srq.c b/drivers/infiniband/hw/mlx4/srq.c
index c4cf91235eee3a..68e8b04c538808 100644
--- a/drivers/infiniband/hw/mlx4/srq.c
+++ b/drivers/infiniband/hw/mlx4/srq.c
@@ -193,13 +193,15 @@ int mlx4_ib_create_srq(struct ib_srq *ib_srq,
 	if (udata)
 		if (ib_copy_to_udata(udata, &srq->msrq.srqn, sizeof (__u32))) {
 			err = -EFAULT;
-			goto err_wrid;
+			goto err_srq;
 		}
 
 	init_attr->attr.max_wr = srq->msrq.max - 1;
 
 	return 0;
 
+err_srq:
+	mlx4_srq_free(dev->dev, &srq->msrq);
 err_wrid:
 	if (udata)
 		mlx4_ib_db_unmap_user(ucontext, &srq->db);
-- 
cgit 1.3-korg

drivers/infiniband/hw/mlx4/srq.c+3 −2 modified

diff --git a/drivers/infiniband/hw/mlx4/srq.c b/drivers/infiniband/hw/mlx4/srq.c
index c4cf91235eee3a..68e8b04c538808 100644
--- a/drivers/infiniband/hw/mlx4/srq.c
+++ b/drivers/infiniband/hw/mlx4/srq.c
@@ -193,13 +193,15 @@ int mlx4_ib_create_srq(struct ib_srq *ib_srq,
 	if (udata)
 		if (ib_copy_to_udata(udata, &srq->msrq.srqn, sizeof (__u32))) {
 			err = -EFAULT;
-			goto err_wrid;
+			goto err_srq;
 		}
 
 	init_attr->attr.max_wr = srq->msrq.max - 1;
 
 	return 0;
 
+err_srq:
+	mlx4_srq_free(dev->dev, &srq->msrq);
 err_wrid:
 	if (udata)
 		mlx4_ib_db_unmap_user(ucontext, &srq->db);
-- 
cgit 1.3-korg

388617f44d81

RDMA/mlx4: Fix resource leak on error in mlx4_ib_create_srq()

https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.gitJason GunthorpeApr 28, 2026Fixed in 7.0.7via kernel-cna

commit

2 files changed · +6 −4

drivers/infiniband/hw/mlx4/srq.c+3 −2 modified

diff --git a/drivers/infiniband/hw/mlx4/srq.c b/drivers/infiniband/hw/mlx4/srq.c
index c4cf91235eee3a..68e8b04c538808 100644
--- a/drivers/infiniband/hw/mlx4/srq.c
+++ b/drivers/infiniband/hw/mlx4/srq.c
@@ -193,13 +193,15 @@ int mlx4_ib_create_srq(struct ib_srq *ib_srq,
 	if (udata)
 		if (ib_copy_to_udata(udata, &srq->msrq.srqn, sizeof (__u32))) {
 			err = -EFAULT;
-			goto err_wrid;
+			goto err_srq;
 		}
 
 	init_attr->attr.max_wr = srq->msrq.max - 1;
 
 	return 0;
 
+err_srq:
+	mlx4_srq_free(dev->dev, &srq->msrq);
 err_wrid:
 	if (udata)
 		mlx4_ib_db_unmap_user(ucontext, &srq->db);
-- 
cgit 1.3-korg

drivers/infiniband/hw/mlx4/srq.c+3 −2 modified

diff --git a/drivers/infiniband/hw/mlx4/srq.c b/drivers/infiniband/hw/mlx4/srq.c
index c4cf91235eee3a..68e8b04c538808 100644
--- a/drivers/infiniband/hw/mlx4/srq.c
+++ b/drivers/infiniband/hw/mlx4/srq.c
@@ -193,13 +193,15 @@ int mlx4_ib_create_srq(struct ib_srq *ib_srq,
 	if (udata)
 		if (ib_copy_to_udata(udata, &srq->msrq.srqn, sizeof (__u32))) {
 			err = -EFAULT;
-			goto err_wrid;
+			goto err_srq;
 		}
 
 	init_attr->attr.max_wr = srq->msrq.max - 1;
 
 	return 0;
 
+err_srq:
+	mlx4_srq_free(dev->dev, &srq->msrq);
 err_wrid:
 	if (udata)
 		mlx4_ib_db_unmap_user(ucontext, &srq->db);
-- 
cgit 1.3-korg

c54c7e4cb679

RDMA/mlx4: Fix resource leak on error in mlx4_ib_create_srq()

https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.gitJason GunthorpeApr 28, 2026Fixed in 7.1-rc3via kernel-cna

commit

2 files changed · +6 −4

drivers/infiniband/hw/mlx4/srq.c+3 −2 modified

diff --git a/drivers/infiniband/hw/mlx4/srq.c b/drivers/infiniband/hw/mlx4/srq.c
index 5b23e5f8b84aca..767840736d583b 100644
--- a/drivers/infiniband/hw/mlx4/srq.c
+++ b/drivers/infiniband/hw/mlx4/srq.c
@@ -194,13 +194,15 @@ int mlx4_ib_create_srq(struct ib_srq *ib_srq,
 	if (udata)
 		if (ib_copy_to_udata(udata, &srq->msrq.srqn, sizeof (__u32))) {
 			err = -EFAULT;
-			goto err_wrid;
+			goto err_srq;
 		}
 
 	init_attr->attr.max_wr = srq->msrq.max - 1;
 
 	return 0;
 
+err_srq:
+	mlx4_srq_free(dev->dev, &srq->msrq);
 err_wrid:
 	if (udata)
 		mlx4_ib_db_unmap_user(ucontext, &srq->db);
-- 
cgit 1.3-korg

drivers/infiniband/hw/mlx4/srq.c+3 −2 modified

diff --git a/drivers/infiniband/hw/mlx4/srq.c b/drivers/infiniband/hw/mlx4/srq.c
index 5b23e5f8b84aca..767840736d583b 100644
--- a/drivers/infiniband/hw/mlx4/srq.c
+++ b/drivers/infiniband/hw/mlx4/srq.c
@@ -194,13 +194,15 @@ int mlx4_ib_create_srq(struct ib_srq *ib_srq,
 	if (udata)
 		if (ib_copy_to_udata(udata, &srq->msrq.srqn, sizeof (__u32))) {
 			err = -EFAULT;
-			goto err_wrid;
+			goto err_srq;
 		}
 
 	init_attr->attr.max_wr = srq->msrq.max - 1;
 
 	return 0;
 
+err_srq:
+	mlx4_srq_free(dev->dev, &srq->msrq);
 err_wrid:
 	if (udata)
 		mlx4_ib_db_unmap_user(ucontext, &srq->db);
-- 
cgit 1.3-korg

e01b8c9286c4

RDMA/mlx4: Fix resource leak on error in mlx4_ib_create_srq()

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.gitJason GunthorpeApr 28, 2026via nvd-ref

commit

2 files changed · +6 −4

drivers/infiniband/hw/mlx4/srq.c+3 −2 modified

diff --git a/drivers/infiniband/hw/mlx4/srq.c b/drivers/infiniband/hw/mlx4/srq.c
index c4cf91235eee3a..68e8b04c538808 100644
--- a/drivers/infiniband/hw/mlx4/srq.c
+++ b/drivers/infiniband/hw/mlx4/srq.c
@@ -193,13 +193,15 @@ int mlx4_ib_create_srq(struct ib_srq *ib_srq,
 	if (udata)
 		if (ib_copy_to_udata(udata, &srq->msrq.srqn, sizeof (__u32))) {
 			err = -EFAULT;
-			goto err_wrid;
+			goto err_srq;
 		}
 
 	init_attr->attr.max_wr = srq->msrq.max - 1;
 
 	return 0;
 
+err_srq:
+	mlx4_srq_free(dev->dev, &srq->msrq);
 err_wrid:
 	if (udata)
 		mlx4_ib_db_unmap_user(ucontext, &srq->db);
-- 
cgit 1.3-korg

drivers/infiniband/hw/mlx4/srq.c+3 −2 modified

diff --git a/drivers/infiniband/hw/mlx4/srq.c b/drivers/infiniband/hw/mlx4/srq.c
index c4cf91235eee3a..68e8b04c538808 100644
--- a/drivers/infiniband/hw/mlx4/srq.c
+++ b/drivers/infiniband/hw/mlx4/srq.c
@@ -193,13 +193,15 @@ int mlx4_ib_create_srq(struct ib_srq *ib_srq,
 	if (udata)
 		if (ib_copy_to_udata(udata, &srq->msrq.srqn, sizeof (__u32))) {
 			err = -EFAULT;
-			goto err_wrid;
+			goto err_srq;
 		}
 
 	init_attr->attr.max_wr = srq->msrq.max - 1;
 
 	return 0;
 
+err_srq:
+	mlx4_srq_free(dev->dev, &srq->msrq);
 err_wrid:
 	if (udata)
 		mlx4_ib_db_unmap_user(ucontext, &srq->db);
-- 
cgit 1.3-korg

c54c7e4cb679

RDMA/mlx4: Fix resource leak on error in mlx4_ib_create_srq()

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.gitJason GunthorpeApr 28, 2026via nvd-ref

commit

2 files changed · +6 −4

drivers/infiniband/hw/mlx4/srq.c+3 −2 modified

diff --git a/drivers/infiniband/hw/mlx4/srq.c b/drivers/infiniband/hw/mlx4/srq.c
index 5b23e5f8b84aca..767840736d583b 100644
--- a/drivers/infiniband/hw/mlx4/srq.c
+++ b/drivers/infiniband/hw/mlx4/srq.c
@@ -194,13 +194,15 @@ int mlx4_ib_create_srq(struct ib_srq *ib_srq,
 	if (udata)
 		if (ib_copy_to_udata(udata, &srq->msrq.srqn, sizeof (__u32))) {
 			err = -EFAULT;
-			goto err_wrid;
+			goto err_srq;
 		}
 
 	init_attr->attr.max_wr = srq->msrq.max - 1;
 
 	return 0;
 
+err_srq:
+	mlx4_srq_free(dev->dev, &srq->msrq);
 err_wrid:
 	if (udata)
 		mlx4_ib_db_unmap_user(ucontext, &srq->db);
-- 
cgit 1.3-korg

drivers/infiniband/hw/mlx4/srq.c+3 −2 modified

diff --git a/drivers/infiniband/hw/mlx4/srq.c b/drivers/infiniband/hw/mlx4/srq.c
index 5b23e5f8b84aca..767840736d583b 100644
--- a/drivers/infiniband/hw/mlx4/srq.c
+++ b/drivers/infiniband/hw/mlx4/srq.c
@@ -194,13 +194,15 @@ int mlx4_ib_create_srq(struct ib_srq *ib_srq,
 	if (udata)
 		if (ib_copy_to_udata(udata, &srq->msrq.srqn, sizeof (__u32))) {
 			err = -EFAULT;
-			goto err_wrid;
+			goto err_srq;
 		}
 
 	init_attr->attr.max_wr = srq->msrq.max - 1;
 
 	return 0;
 
+err_srq:
+	mlx4_srq_free(dev->dev, &srq->msrq);
 err_wrid:
 	if (udata)
 		mlx4_ib_db_unmap_user(ucontext, &srq->db);
-- 
cgit 1.3-korg

c5dc30da9900

RDMA/mlx4: Fix resource leak on error in mlx4_ib_create_srq()

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.gitJason GunthorpeApr 28, 2026via nvd-ref

commit

2 files changed · +6 −4

drivers/infiniband/hw/mlx4/srq.c+3 −2 modified

diff --git a/drivers/infiniband/hw/mlx4/srq.c b/drivers/infiniband/hw/mlx4/srq.c
index c4cf91235eee3a..68e8b04c538808 100644
--- a/drivers/infiniband/hw/mlx4/srq.c
+++ b/drivers/infiniband/hw/mlx4/srq.c
@@ -193,13 +193,15 @@ int mlx4_ib_create_srq(struct ib_srq *ib_srq,
 	if (udata)
 		if (ib_copy_to_udata(udata, &srq->msrq.srqn, sizeof (__u32))) {
 			err = -EFAULT;
-			goto err_wrid;
+			goto err_srq;
 		}
 
 	init_attr->attr.max_wr = srq->msrq.max - 1;
 
 	return 0;
 
+err_srq:
+	mlx4_srq_free(dev->dev, &srq->msrq);
 err_wrid:
 	if (udata)
 		mlx4_ib_db_unmap_user(ucontext, &srq->db);
-- 
cgit 1.3-korg

drivers/infiniband/hw/mlx4/srq.c+3 −2 modified

diff --git a/drivers/infiniband/hw/mlx4/srq.c b/drivers/infiniband/hw/mlx4/srq.c
index c4cf91235eee3a..68e8b04c538808 100644
--- a/drivers/infiniband/hw/mlx4/srq.c
+++ b/drivers/infiniband/hw/mlx4/srq.c
@@ -193,13 +193,15 @@ int mlx4_ib_create_srq(struct ib_srq *ib_srq,
 	if (udata)
 		if (ib_copy_to_udata(udata, &srq->msrq.srqn, sizeof (__u32))) {
 			err = -EFAULT;
-			goto err_wrid;
+			goto err_srq;
 		}
 
 	init_attr->attr.max_wr = srq->msrq.max - 1;
 
 	return 0;
 
+err_srq:
+	mlx4_srq_free(dev->dev, &srq->msrq);
 err_wrid:
 	if (udata)
 		mlx4_ib_db_unmap_user(ucontext, &srq->db);
-- 
cgit 1.3-korg

0dbd619716fb

RDMA/mlx4: Fix resource leak on error in mlx4_ib_create_srq()

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.gitJason GunthorpeApr 28, 2026via nvd-ref

commit

2 files changed · +6 −4

drivers/infiniband/hw/mlx4/srq.c+3 −2 modified

diff --git a/drivers/infiniband/hw/mlx4/srq.c b/drivers/infiniband/hw/mlx4/srq.c
index c4cf91235eee3a..68e8b04c538808 100644
--- a/drivers/infiniband/hw/mlx4/srq.c
+++ b/drivers/infiniband/hw/mlx4/srq.c
@@ -193,13 +193,15 @@ int mlx4_ib_create_srq(struct ib_srq *ib_srq,
 	if (udata)
 		if (ib_copy_to_udata(udata, &srq->msrq.srqn, sizeof (__u32))) {
 			err = -EFAULT;
-			goto err_wrid;
+			goto err_srq;
 		}
 
 	init_attr->attr.max_wr = srq->msrq.max - 1;
 
 	return 0;
 
+err_srq:
+	mlx4_srq_free(dev->dev, &srq->msrq);
 err_wrid:
 	if (udata)
 		mlx4_ib_db_unmap_user(ucontext, &srq->db);
-- 
cgit 1.3-korg

drivers/infiniband/hw/mlx4/srq.c+3 −2 modified

diff --git a/drivers/infiniband/hw/mlx4/srq.c b/drivers/infiniband/hw/mlx4/srq.c
index c4cf91235eee3a..68e8b04c538808 100644
--- a/drivers/infiniband/hw/mlx4/srq.c
+++ b/drivers/infiniband/hw/mlx4/srq.c
@@ -193,13 +193,15 @@ int mlx4_ib_create_srq(struct ib_srq *ib_srq,
 	if (udata)
 		if (ib_copy_to_udata(udata, &srq->msrq.srqn, sizeof (__u32))) {
 			err = -EFAULT;
-			goto err_wrid;
+			goto err_srq;
 		}
 
 	init_attr->attr.max_wr = srq->msrq.max - 1;
 
 	return 0;
 
+err_srq:
+	mlx4_srq_free(dev->dev, &srq->msrq);
 err_wrid:
 	if (udata)
 		mlx4_ib_db_unmap_user(ucontext, &srq->db);
-- 
cgit 1.3-korg

388617f44d81

RDMA/mlx4: Fix resource leak on error in mlx4_ib_create_srq()

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.gitJason GunthorpeApr 28, 2026via nvd-ref

commit

2 files changed · +6 −4

drivers/infiniband/hw/mlx4/srq.c+3 −2 modified

diff --git a/drivers/infiniband/hw/mlx4/srq.c b/drivers/infiniband/hw/mlx4/srq.c
index c4cf91235eee3a..68e8b04c538808 100644
--- a/drivers/infiniband/hw/mlx4/srq.c
+++ b/drivers/infiniband/hw/mlx4/srq.c
@@ -193,13 +193,15 @@ int mlx4_ib_create_srq(struct ib_srq *ib_srq,
 	if (udata)
 		if (ib_copy_to_udata(udata, &srq->msrq.srqn, sizeof (__u32))) {
 			err = -EFAULT;
-			goto err_wrid;
+			goto err_srq;
 		}
 
 	init_attr->attr.max_wr = srq->msrq.max - 1;
 
 	return 0;
 
+err_srq:
+	mlx4_srq_free(dev->dev, &srq->msrq);
 err_wrid:
 	if (udata)
 		mlx4_ib_db_unmap_user(ucontext, &srq->db);
-- 
cgit 1.3-korg

drivers/infiniband/hw/mlx4/srq.c+3 −2 modified

diff --git a/drivers/infiniband/hw/mlx4/srq.c b/drivers/infiniband/hw/mlx4/srq.c
index c4cf91235eee3a..68e8b04c538808 100644
--- a/drivers/infiniband/hw/mlx4/srq.c
+++ b/drivers/infiniband/hw/mlx4/srq.c
@@ -193,13 +193,15 @@ int mlx4_ib_create_srq(struct ib_srq *ib_srq,
 	if (udata)
 		if (ib_copy_to_udata(udata, &srq->msrq.srqn, sizeof (__u32))) {
 			err = -EFAULT;
-			goto err_wrid;
+			goto err_srq;
 		}
 
 	init_attr->attr.max_wr = srq->msrq.max - 1;
 
 	return 0;
 
+err_srq:
+	mlx4_srq_free(dev->dev, &srq->msrq);
 err_wrid:
 	if (udata)
 		mlx4_ib_db_unmap_user(ucontext, &srq->db);
-- 
cgit 1.3-korg

Vulnerability mechanics

Root cause

"Missing resource deallocation in error path: mlx4_srq_free() was not called when ib_copy_to_udata() fails after a successful mlx4_srq_alloc()."

Attack vector

An attacker with the ability to create an SRQ (Shared Receive Queue) via the RDMA subsystem can trigger the bug by causing `ib_copy_to_udata()` to fail — for example, by providing a user buffer that is too small to hold the SRQ number. When the copy fails, the error path jumps to `err_wrid` and returns `-EFAULT` without freeing the previously allocated SRQ resource [patch_id=2898015]. This leaks kernel memory and SRQ hardware resources, which can be repeated to exhaust system resources.

Affected code

The bug is in `drivers/infiniband/hw/mlx4/srq.c` in the function `mlx4_ib_create_srq()`. The error path after a failed `ib_copy_to_udata()` call jumped to `err_wrid`, which only unmaps the user database but never calls `mlx4_srq_free()` to release the SRQ allocated earlier by `mlx4_srq_alloc()` [patch_id=2898015].

What the fix does

The patch adds a new error label `err_srq` that calls `mlx4_srq_free(dev->dev, &srq->msrq)` before falling through to the existing `err_wrid` cleanup. The `ib_copy_to_udata()` failure now jumps to `err_srq` instead of `err_wrid`, ensuring the SRQ allocated by `mlx4_srq_alloc()` is properly freed on this error path [patch_id=2898015]. This closes the resource leak by making the error unwind symmetric with the allocation order.

Preconditions

authThe attacker must be able to invoke the RDMA create SRQ operation (requires appropriate RDMA device access or local root privileges on the system).
inputThe attacker must provide a user buffer (udata) that causes ib_copy_to_udata() to fail, e.g., a buffer too small to hold the SRQ number.

Generated on May 28, 2026. Inputs: CWE entries + fix-commit diffs from this CVE's patches. Citations validated against bundle.

References

News mentions

No linked articles in our index yet.

cvss	0.000
epss	0.000
exploit	0.000
kev	0.000
patch	-0.070
ransomware	0.000