Critical severity9.4NVD Advisory· Published Apr 25, 2026· Updated Jun 1, 2026
CVE-2026-31685
CVE-2026-31685
Description
In the Linux kernel, the following vulnerability has been resolved:
netfilter: ip6t_eui64: reject invalid MAC header for all packets
eui64_mt6() derives a modified EUI-64 from the Ethernet source address and compares it with the low 64 bits of the IPv6 source address.
The existing guard only rejects an invalid MAC header when par->fragoff != 0. For packets with par->fragoff == 0, eui64_mt6() can still reach eth_hdr(skb) even when the MAC header is not valid.
Fix this by removing the par->fragoff != 0 condition so that packets with an invalid MAC header are rejected before accessing eth_hdr(skb).
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
102cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*+ 13 more
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*range: >=2.6.12.1,<6.6.136
- cpe:2.3:o:linux:linux_kernel:2.6.12:-:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:2.6.12:rc2:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:2.6.12:rc3:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:2.6.12:rc4:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:2.6.12:rc5:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:7.0:rc3:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:7.0:rc4:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:7.0:rc5:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:7.0:rc6:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:7.0:rc7:*:*:*:*:*:*
- (no CPE)
- osv-coords88 versionspkg:apk/chainguard/linux-aws-6.18pkg:apk/chainguard/linux-azure-6.18pkg:apk/chainguard/linux-gcp-6.18pkg:apk/chainguard/linux-qemu-6.18pkg:apk/chainguard/linux-vmware-6.18pkg:rpm/almalinux/bpftoolpkg:rpm/almalinux/kernelpkg:rpm/almalinux/kernel-64kpkg:rpm/almalinux/kernel-64k-corepkg:rpm/almalinux/kernel-64k-debugpkg:rpm/almalinux/kernel-64k-debug-corepkg:rpm/almalinux/kernel-64k-debug-develpkg:rpm/almalinux/kernel-64k-debug-devel-matchedpkg:rpm/almalinux/kernel-64k-debug-modulespkg:rpm/almalinux/kernel-64k-debug-modules-corepkg:rpm/almalinux/kernel-64k-debug-modules-extrapkg:rpm/almalinux/kernel-64k-develpkg:rpm/almalinux/kernel-64k-devel-matchedpkg:rpm/almalinux/kernel-64k-modulespkg:rpm/almalinux/kernel-64k-modules-corepkg:rpm/almalinux/kernel-64k-modules-extrapkg:rpm/almalinux/kernel-abi-stablelistspkg:rpm/almalinux/kernel-corepkg:rpm/almalinux/kernel-cross-headerspkg:rpm/almalinux/kernel-debugpkg:rpm/almalinux/kernel-debug-corepkg:rpm/almalinux/kernel-debug-develpkg:rpm/almalinux/kernel-debug-devel-matchedpkg:rpm/almalinux/kernel-debug-modulespkg:rpm/almalinux/kernel-debug-modules-corepkg:rpm/almalinux/kernel-debug-modules-extrapkg:rpm/almalinux/kernel-debug-uki-virtpkg:rpm/almalinux/kernel-develpkg:rpm/almalinux/kernel-devel-matchedpkg:rpm/almalinux/kernel-docpkg:rpm/almalinux/kernel-headerspkg:rpm/almalinux/kernel-modulespkg:rpm/almalinux/kernel-modules-corepkg:rpm/almalinux/kernel-modules-extrapkg:rpm/almalinux/kernel-modules-extra-matchedpkg:rpm/almalinux/kernel-rtpkg:rpm/almalinux/kernel-rt-64kpkg:rpm/almalinux/kernel-rt-64k-corepkg:rpm/almalinux/kernel-rt-64k-debugpkg:rpm/almalinux/kernel-rt-64k-debug-corepkg:rpm/almalinux/kernel-rt-64k-debug-develpkg:rpm/almalinux/kernel-rt-64k-debug-modulespkg:rpm/almalinux/kernel-rt-64k-debug-modules-corepkg:rpm/almalinux/kernel-rt-64k-debug-modules-extrapkg:rpm/almalinux/kernel-rt-64k-develpkg:rpm/almalinux/kernel-rt-64k-modulespkg:rpm/almalinux/kernel-rt-64k-modules-corepkg:rpm/almalinux/kernel-rt-64k-modules-extrapkg:rpm/almalinux/kernel-rt-corepkg:rpm/almalinux/kernel-rt-debugpkg:rpm/almalinux/kernel-rt-debug-corepkg:rpm/almalinux/kernel-rt-debug-develpkg:rpm/almalinux/kernel-rt-debug-modulespkg:rpm/almalinux/kernel-rt-debug-modules-corepkg:rpm/almalinux/kernel-rt-debug-modules-extrapkg:rpm/almalinux/kernel-rt-develpkg:rpm/almalinux/kernel-rt-modulespkg:rpm/almalinux/kernel-rt-modules-corepkg:rpm/almalinux/kernel-rt-modules-extrapkg:rpm/almalinux/kernel-toolspkg:rpm/almalinux/kernel-tools-libspkg:rpm/almalinux/kernel-tools-libs-develpkg:rpm/almalinux/kernel-uki-virtpkg:rpm/almalinux/kernel-uki-virt-addonspkg:rpm/almalinux/kernel-zfcpdumppkg:rpm/almalinux/kernel-zfcpdump-corepkg:rpm/almalinux/kernel-zfcpdump-develpkg:rpm/almalinux/kernel-zfcpdump-devel-matchedpkg:rpm/almalinux/kernel-zfcpdump-modulespkg:rpm/almalinux/kernel-zfcpdump-modules-corepkg:rpm/almalinux/kernel-zfcpdump-modules-extrapkg:rpm/almalinux/libperfpkg:rpm/almalinux/perfpkg:rpm/almalinux/python3-perfpkg:rpm/almalinux/rtlapkg:rpm/almalinux/rvpkg:rpm/suse/kernel-default&distro=SUSE%20Linux%20Enterprise%20Server%2011%20SP4%20LTSS%20EXTREME%20COREpkg:rpm/suse/kernel-docs&distro=SUSE%20Linux%20Enterprise%20Server%2011%20SP4%20LTSS%20EXTREME%20COREpkg:rpm/suse/kernel-ec2&distro=SUSE%20Linux%20Enterprise%20Server%2011%20SP4%20LTSS%20EXTREME%20COREpkg:rpm/suse/kernel-source&distro=SUSE%20Linux%20Enterprise%20Server%2011%20SP4%20LTSS%20EXTREME%20COREpkg:rpm/suse/kernel-syms&distro=SUSE%20Linux%20Enterprise%20Server%2011%20SP4%20LTSS%20EXTREME%20COREpkg:rpm/suse/kernel-trace&distro=SUSE%20Linux%20Enterprise%20Server%2011%20SP4%20LTSS%20EXTREME%20COREpkg:rpm/suse/kernel-xen&distro=SUSE%20Linux%20Enterprise%20Server%2011%20SP4%20LTSS%20EXTREME%20CORE
< 6.18.31-r0+ 87 more
- (no CPE)range: < 6.18.31-r0
- (no CPE)range: < 6.18.31-r0
- (no CPE)range: < 6.18.31-r0
- (no CPE)range: < 6.18.24-r3
- (no CPE)range: < 6.18.31-r0
- (no CPE)range: < 4.18.0-553.126.1.el8_10
- (no CPE)range: < 5.14.0-687.12.1.el9_8
- (no CPE)range: < 5.14.0-687.12.1.el9_8
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- (no CPE)range: < 5.14.0-687.12.1.el9_8
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- (no CPE)range: < 5.14.0-687.12.1.el9_8
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- (no CPE)range: < 5.14.0-687.12.1.el9_8
- (no CPE)range: < 5.14.0-687.12.1.el9_8
- (no CPE)range: < 5.14.0-687.12.1.el9_8
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- (no CPE)range: < 5.14.0-687.12.1.el9_8
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- (no CPE)range: < 5.14.0-687.12.1.el9_8
- (no CPE)range: < 5.14.0-687.12.1.el9_8
- (no CPE)range: < 5.14.0-687.12.1.el9_8
- (no CPE)range: < 5.14.0-687.12.1.el9_8
- (no CPE)range: < 5.14.0-687.12.1.el9_8
- (no CPE)range: < 5.14.0-687.12.1.el9_8
- (no CPE)range: < 5.14.0-687.12.1.el9_8
- (no CPE)range: < 5.14.0-687.12.1.el9_8
- (no CPE)range: < 5.14.0-687.12.1.el9_8
- (no CPE)range: < 5.14.0-687.12.1.el9_8
- (no CPE)range: < 5.14.0-687.12.1.el9_8
- (no CPE)range: < 5.14.0-687.12.1.el9_8
- (no CPE)range: < 5.14.0-687.12.1.el9_8
- (no CPE)range: < 5.14.0-687.12.1.el9_8
- (no CPE)range: < 5.14.0-687.12.1.el9_8
- (no CPE)range: < 5.14.0-687.12.1.el9_8
- (no CPE)range: < 5.14.0-687.12.1.el9_8
- (no CPE)range: < 6.12.0-211.18.1.el10_2
- (no CPE)range: < 5.14.0-687.12.1.el9_8
- (no CPE)range: < 5.14.0-687.12.1.el9_8
- (no CPE)range: < 5.14.0-687.12.1.el9_8
- (no CPE)range: < 5.14.0-687.12.1.el9_8
- (no CPE)range: < 5.14.0-687.12.1.el9_8
- (no CPE)range: < 5.14.0-687.12.1.el9_8
- (no CPE)range: < 5.14.0-687.12.1.el9_8
- (no CPE)range: < 5.14.0-687.12.1.el9_8
- (no CPE)range: < 5.14.0-687.12.1.el9_8
- (no CPE)range: < 5.14.0-687.12.1.el9_8
- (no CPE)range: < 5.14.0-687.12.1.el9_8
- (no CPE)range: < 5.14.0-687.12.1.el9_8
- (no CPE)range: < 5.14.0-687.12.1.el9_8
- (no CPE)range: < 5.14.0-687.12.1.el9_8
- (no CPE)range: < 5.14.0-687.12.1.el9_8
- (no CPE)range: < 5.14.0-687.12.1.el9_8
- (no CPE)range: < 5.14.0-687.12.1.el9_8
- (no CPE)range: < 5.14.0-687.12.1.el9_8
- (no CPE)range: < 5.14.0-687.12.1.el9_8
- (no CPE)range: < 5.14.0-687.12.1.el9_8
- (no CPE)range: < 5.14.0-687.12.1.el9_8
- (no CPE)range: < 5.14.0-687.12.1.el9_8
- (no CPE)range: < 5.14.0-687.12.1.el9_8
- (no CPE)range: < 5.14.0-687.12.1.el9_8
- (no CPE)range: < 5.14.0-687.12.1.el9_8
- (no CPE)range: < 5.14.0-687.12.1.el9_8
- (no CPE)range: < 5.14.0-687.12.1.el9_8
- (no CPE)range: < 5.14.0-687.12.1.el9_8
- (no CPE)range: < 5.14.0-687.12.1.el9_8
- (no CPE)range: < 5.14.0-687.12.1.el9_8
- (no CPE)range: < 5.14.0-687.12.1.el9_8
- (no CPE)range: < 5.14.0-687.12.1.el9_8
- (no CPE)range: < 5.14.0-687.12.1.el9_8
- (no CPE)range: < 5.14.0-687.12.1.el9_8
- (no CPE)range: < 5.14.0-687.12.1.el9_8
- (no CPE)range: < 5.14.0-687.12.1.el9_8
- (no CPE)range: < 5.14.0-687.12.1.el9_8
- (no CPE)range: < 5.14.0-687.12.1.el9_8
- (no CPE)range: < 5.14.0-687.12.1.el9_8
- (no CPE)range: < 5.14.0-687.12.1.el9_8
- (no CPE)range: < 5.14.0-687.12.1.el9_8
- (no CPE)range: < 3.0.101-108.210.1
- (no CPE)range: < 3.0.101-108.210.1
- (no CPE)range: < 3.0.101-108.210.1
- (no CPE)range: < 3.0.101-108.210.1
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- (no CPE)range: < 3.0.101-108.210.1
- (no CPE)range: < 3.0.101-108.210.1
Patches
Vulnerability mechanics
References
8- git.kernel.org/stable/c/288138418bef956f8b295751a4536c60f0e89f4anvdPatch
- git.kernel.org/stable/c/309ae3e9a51a69699ca94eac5fac5688fa562d55nvdPatch
- git.kernel.org/stable/c/807d6ee15804df6f01a35c910f09612e858739a6nvdPatch
- git.kernel.org/stable/c/9eda5478746ef7dc0e4e537b5a5e4b0ca1027091nvdPatch
- git.kernel.org/stable/c/fdce0b3590f724540795b874b4c8850c90e6b0a8nvdPatch
- git.kernel.org/stable/c/4d75bc2cd093bf5803edf512c099bfb220fd6459nvd
- git.kernel.org/stable/c/7d6a57411caf54df025860c9b1a82cd42d57a562nvd
- git.kernel.org/stable/c/d5603591373441fecf9951833d6d873e09320f08nvd
News mentions
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