Medium severity5.5NVD Advisory· Published Jun 25, 2026· Updated Sep 8, 2026
CVE-2026-53218
CVE-2026-53218
Description
In the Linux kernel, the following vulnerability has been resolved:
netfilter: nft_exthdr: fix register tracking for F_PRESENT flag
nft_exthdr_init() passes user-controlled priv->len to nft_parse_register_store(), which marks that many bytes in the register bitmap as initialized. However, when NFT_EXTHDR_F_PRESENT is set, the eval paths write only 1 byte (nft_reg_store8) or 4 bytes (*dest = 0 on TCP/DCCP error path). When len > 4, registers beyond the first are never written, retaining uninitialized stack data from nft_regs.
Bail out if userspace requests too much data when F_PRESENT is set.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
36- osv-coords27 versionspkg:rpm/opensuse/kernel-obs-qa&distro=openSUSE%20Leap%2016.0pkg:rpm/opensuse/kernel-rt&distro=openSUSE%20Leap%2016.0pkg:apk/chainguard/linux-qemu-6.18pkg:apk/chainguard/linux-qemu-6.18-bootc-boot-installedpkg:apk/chainguard/linux-gcp-6.12pkg:linux/kernelpkg:rpm/opensuse/kernel-default&distro=openSUSE%20Leap%2016.0pkg:rpm/opensuse/kernel-syms&distro=openSUSE%20Leap%2016.0pkg:rpm/opensuse/kernel-azure&distro=openSUSE%20Leap%2016.0pkg:apk/chainguard/linux-qemu-melangepkg:rpm/opensuse/kernel-kvmsmall&distro=openSUSE%20Leap%2016.0pkg:rpm/opensuse/kernel-obs-build&distro=openSUSE%20Leap%2016.0pkg:rpm/opensuse/kernel-source&distro=openSUSE%20Leap%2016.0pkg:rpm/opensuse/kernel-64kb&distro=openSUSE%20Leap%2016.0pkg:rpm/opensuse/kernel-default-base&distro=openSUSE%20Leap%2016.0pkg:rpm/opensuse/dtb-aarch64&distro=openSUSE%20Leap%2016.0pkg:rpm/opensuse/kernel-docs&distro=openSUSE%20Leap%2016.0pkg:rpm/opensuse/kernel-zfcpdump&distro=openSUSE%20Leap%2016.0pkg:apk/chainguard/linux-qemu-6.12pkg:apk/chainguard/linux-azure-6.18pkg:apk/chainguard/linux-gcp-6.18pkg:apk/chainguard/linux-aws-6.12pkg:apk/chainguard/linux-vmware-6.12pkg:apk/chainguard/linux-vmware-6.18pkg:apk/chainguard/linux-aws-6.18pkg:apk/chainguard/linux-azure-6.12pkg:apk/chainguard/linux-gcp-6.18-bootc-boot-installed
< 6.12.0-160000.37.1+ 26 more
- (no CPE)range: < 6.12.0-160000.37.1
- (no CPE)range: < 6.12.0-160000.37.1
- (no CPE)range: < 6.18.38-r0
- (no CPE)range: < 6.18.38-r0
- (no CPE)range: < 6.12.95-r0
- (no CPE)range: >= 4.11.0, < 5.10.259
- (no CPE)range: < 6.12.0-160000.37.1
- (no CPE)range: < 6.12.0-160000.37.1
- (no CPE)range: < 6.12.0-160000.37.1
- (no CPE)range: < 6.18.38-r0
- (no CPE)range: < 6.12.0-160000.37.1
- (no CPE)range: < 6.12.0-160000.37.1
- (no CPE)range: < 6.12.0-160000.37.1
- (no CPE)range: < 6.12.0-160000.37.1
- (no CPE)range: < 6.12.0-160000.37.1.160000.2.19
- (no CPE)range: < 6.12.0-160000.37.1
- (no CPE)range: < 6.12.0-160000.37.1
- (no CPE)range: < 6.12.0-160000.37.1
- (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: < 6.12.95-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
(expand)+ 8 more
- (no CPE)
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*range: >=4.11,<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:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:7.1:rc7:*:*:*:*:*:*
Patches
Vulnerability mechanics
References
9- git.kernel.org/stable/c/19748967d59c31d24d21d40b728570788310b237nvdPatch
- git.kernel.org/stable/c/46fc15a044e9938e7ea77786fb37edd2cd74f031nvdPatch
- git.kernel.org/stable/c/67b27434c43b68a97becda98c9f0c8cf6cba2134nvdPatch
- git.kernel.org/stable/c/772cecf198da732faebb5dcfc46d66a505be8495nvdPatch
- git.kernel.org/stable/c/78069a6d8bc86c9e036eb82c2af4a19cc1871a53nvdPatch
- git.kernel.org/stable/c/8738b1b6d0e639ca1fc0f61516afd3557ac4ecc6nvdPatch
- git.kernel.org/stable/c/cd513e43b4b2bd1de39e2367bc4261c699a8652fnvdPatch
- git.kernel.org/stable/c/f08fb3d42fd3aad0b7a263da3ac3ebaf0845e265nvdPatch
- cert-portal.siemens.com/productcert/html/ssa-019113.htmlnvd
News mentions
1- Linux Kernel: 25 CVEs Land in a Single Day, Spanning Bluetooth to Memory ManagementVypr Intelligence · Jun 26, 2026