Medium severity5.5NVD Advisory· Published Apr 25, 2026· Updated Jun 1, 2026
CVE-2026-31684
CVE-2026-31684
Description
In the Linux kernel, the following vulnerability has been resolved:
net: sched: act_csum: validate nested VLAN headers
tcf_csum_act() walks nested VLAN headers directly from skb->data when an skb still carries in-payload VLAN tags. The current code reads vlan->h_vlan_encapsulated_proto and then pulls VLAN_HLEN bytes without first ensuring that the full VLAN header is present in the linear area.
If only part of an inner VLAN header is linearized, accessing h_vlan_encapsulated_proto reads past the linear area, and the following skb_pull(VLAN_HLEN) may violate skb invariants.
Fix this by requiring pskb_may_pull(skb, VLAN_HLEN) before accessing and pulling each nested VLAN header. If the header still is not fully available, drop the packet through the existing error path.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
90cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*+ 8 more
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*range: >=4.19.99,<4.20
- 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-coords81 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/rv
< 6.18.31-r0+ 80 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
- (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: < 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
Patches
Vulnerability mechanics
References
8- git.kernel.org/stable/c/3d165d975305cf76ff0b10a3c798fb31e5f5f9a5nvdPatch
- git.kernel.org/stable/c/a69738efea0996d05a3c7d2178551b891744df1bnvdPatch
- git.kernel.org/stable/c/c842743d073bdd683606cb414eb0ca84465dd834nvdPatch
- git.kernel.org/stable/c/eb3765b90eb8f2a3d6310a80c14a9e57ec4267a2nvdPatch
- git.kernel.org/stable/c/ec4930979b3f7bbeb7af5744599fc6603a4dba62nvdPatch
- git.kernel.org/stable/c/0410c619e86551677fb79887a38eccad3f5a0725nvd
- git.kernel.org/stable/c/46c07ad50fa2f4ba7663ee1b72b75ad7ad45cf09nvd
- git.kernel.org/stable/c/886469b6455611a511aa6013e957e15e50577513nvd
News mentions
0No linked articles in our index yet.