High severity7.8NVD Advisory· Published Jun 25, 2026· Updated Jul 2, 2026
CVE-2026-53212
CVE-2026-53212
Description
In the Linux kernel, the following vulnerability has been resolved:
netfilter: nft_tunnel: fix use-after-free on object destroy
nft_tunnel_obj_destroy() calls metadata_dst_free() which directly kfree()s the metadata_dst, ignoring the dst_entry refcount. Packets that took a reference via dst_hold() in nft_tunnel_obj_eval() and are still queued (e.g. in a netem qdisc) are left with a dangling pointer. When these packets are eventually dequeued, dst_release() operates on freed memory.
Replace metadata_dst_free() with dst_release() so the metadata_dst is freed only after all references are dropped. The dst subsystem already handles metadata_dst cleanup in dst_destroy() when DST_METADATA is set.
Affected products
22cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*+ 7 more
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*range: >=4.19,<5.10.259
- cpe:2.3:o:linux:linux_kernel:7.1:rc1:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:7.1:rc2:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:7.1:rc3:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:7.1:rc4:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:7.1:rc5:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:7.1:rc6:*:*:*:*:*:*
- (no CPE)
- osv-coords14 versionspkg:apk/chainguard/linux-aws-6.12pkg:apk/chainguard/linux-aws-6.18pkg:apk/chainguard/linux-azure-6.12pkg:apk/chainguard/linux-azure-6.18pkg:apk/chainguard/linux-gcp-6.12pkg:apk/chainguard/linux-gcp-6.18pkg:apk/chainguard/linux-gcp-6.18-bootc-boot-installedpkg:apk/chainguard/linux-qemu-6.12pkg:apk/chainguard/linux-qemu-6.18pkg:apk/chainguard/linux-qemu-6.18-bootc-boot-installedpkg:apk/chainguard/linux-qemu-melangepkg:apk/chainguard/linux-vmware-6.12pkg:apk/chainguard/linux-vmware-6.18pkg:linux/kernel
< 6.12.95-r0+ 13 more
- (no CPE)range: < 6.12.95-r0
- (no CPE)range: < 6.18.38-r0
- (no CPE)range: < 6.12.95-r0
- (no CPE)range: < 6.18.38-r0
- (no CPE)range: < 6.12.95-r0
- (no CPE)range: < 6.18.38-r0
- (no CPE)range: < 6.18.38-r0
- (no CPE)range: < 6.12.95-r0
- (no CPE)range: < 6.18.38-r0
- (no CPE)range: < 6.18.38-r0
- (no CPE)range: < 6.18.38-r0
- (no CPE)range: < 6.12.95-r0
- (no CPE)range: < 6.18.38-r0
- (no CPE)range: >= 4.19.0, < 5.10.259
Patches
Vulnerability mechanics
References
8- git.kernel.org/stable/c/349df61526d2e39decc685d246202e3e284cfe05nvdPatch
- git.kernel.org/stable/c/55b79b1ae42372012413ce0413181d26679b17efnvdPatch
- git.kernel.org/stable/c/5e9ee18b27fde88cb6148202b33916c66693fe82nvdPatch
- git.kernel.org/stable/c/8767fe4079affa74314d7eb3220e700150289842nvdPatch
- git.kernel.org/stable/c/941d7394efda5e054e2d6f3e0dd0f6a9ba19aaa3nvdPatch
- git.kernel.org/stable/c/c32b26aaa2f9216520a38b3f4bfeec846eb3eb8anvdPatch
- git.kernel.org/stable/c/f9a0e4b61054cde89a2a77845293c726cc07cc43nvdPatch
- git.kernel.org/stable/c/fda6573a46ad24f35348e024905ee5bdf729797envdPatch
News mentions
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