llc: reserve device headroom for allocated frames

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-98526
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-18 16:17:04 UTC
Updated2026-10-18 16:17:04 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: llc: reserve device headroom for allocated frames llc_alloc_frame() reserves link-layer headroom using the device type. This is insufficient for stacked Ethernet devices such as VLAN devices, where vlan_dev_hard_header() pushes a VLAN header before the lower device's Ethernet header. An LLC response on such a device can therefore underflow skb headroom in eth_header(). Use LL_RESERVED_SPACE() to account for the device's actual required headroom while preserving the existing LLC device-type check.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected bf9ae5386bca8836c16e69ab8fdbe46767d7452a 018020f5a48cc86fdd6dc2d380f6c70443ae7639 git Not specified
CNA Linux Linux affected bf9ae5386bca8836c16e69ab8fdbe46767d7452a 3a3f57c4061d9e9cc3bc04205d36ce41ae3406c1 git Not specified
CNA Linux Linux affected bf9ae5386bca8836c16e69ab8fdbe46767d7452a 7c38524b2b2456bd33cb360420da6cbf9cad1b33 git Not specified
CNA Linux Linux affected bf9ae5386bca8836c16e69ab8fdbe46767d7452a 1937222c2511ac91377d39f28106c34734f5f8c6 git Not specified
CNA Linux Linux affected bf9ae5386bca8836c16e69ab8fdbe46767d7452a 16ceac2daa89dd16917bc488ab05b9dd6961a603 git Not specified
CNA Linux Linux affected bf9ae5386bca8836c16e69ab8fdbe46767d7452a e06f8b6e27cc616d3c587e9784c4a033eb310a16 git Not specified
CNA Linux Linux affected bf9ae5386bca8836c16e69ab8fdbe46767d7452a 3361c93e417384ebf28003e0fb6d5304653d3b05 git Not specified
CNA Linux Linux affected bf9ae5386bca8836c16e69ab8fdbe46767d7452a 72b5b9a28b996e09b8b5b944370c79851bb68f52 git Not specified
CNA Linux Linux affected 2.6.34 Not specified
CNA Linux Linux unaffected 2.6.34 semver Not specified
CNA Linux Linux unaffected 5.10.271 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.222 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.189 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.158 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.112 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.55 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.9 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/1937222c2511ac91377d39f28106c34734f5f8c6 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/e06f8b6e27cc616d3c587e9784c4a033eb310a16 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/16ceac2daa89dd16917bc488ab05b9dd6961a603 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/018020f5a48cc86fdd6dc2d380f6c70443ae7639 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/3361c93e417384ebf28003e0fb6d5304653d3b05 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/7c38524b2b2456bd33cb360420da6cbf9cad1b33 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/3a3f57c4061d9e9cc3bc04205d36ce41ae3406c1 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/72b5b9a28b996e09b8b5b944370c79851bb68f52 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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