net: skbuff: fix pull-bound underflow in skb_checksum_setup_ipv6()

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-98573
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-18 16:17:09 UTC
Updated2026-10-19 10:19:15 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: net: skbuff: fix pull-bound underflow in skb_checksum_setup_ipv6() skb_maybe_pull_tail() subtracts skb_headlen(skb) from the unsigned max argument and passes the result to __pskb_pull_tail() as a signed int. The function does not ensure that max is at least skb_headlen(skb). This can happen while parsing IPv6 extension headers when an skb already has a linear area larger than MAX_IPV6_HDR_LEN. Once the parser needs data beyond the linear area, max - skb_headlen(skb) wraps and is converted to a negative delta. __pskb_pull_tail() then passes that negative length to skb_copy_bits(), where it can become a very large copy length. Pass the requested length itself as the pull bound at the three extension-header call sites, so the delta can no longer go negative.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 1431fb31ecbaba1b5718006128f0f2ed0b94e1c3 9c4e432132a97b82edf28fa172c39f743e6bfb26 git Not specified
CNA Linux Linux affected 1431fb31ecbaba1b5718006128f0f2ed0b94e1c3 718747afa5463d9cc5fd9a09f03b2a492edd9b78 git Not specified
CNA Linux Linux affected 1431fb31ecbaba1b5718006128f0f2ed0b94e1c3 a0ad0473c09d2e947aecac5c82e637ec85924b12 git Not specified
CNA Linux Linux affected 1431fb31ecbaba1b5718006128f0f2ed0b94e1c3 b2da5ed3d8c75e1b729a21b6d3beaed415e263f6 git Not specified
CNA Linux Linux affected 1431fb31ecbaba1b5718006128f0f2ed0b94e1c3 6c28c31f051dbf49c71ba7ab7bb9bc905fa1d14b git Not specified
CNA Linux Linux affected 1431fb31ecbaba1b5718006128f0f2ed0b94e1c3 cfa643f2ca36c6f913fe1a2ceb12412ebb0fd962 git Not specified
CNA Linux Linux affected 1431fb31ecbaba1b5718006128f0f2ed0b94e1c3 d7f474226809471dc7877435e9c492cc914df0bf git Not specified
CNA Linux Linux affected 1431fb31ecbaba1b5718006128f0f2ed0b94e1c3 3b4e0b0c008a8c1b474730248cd5b873026c74bd git Not specified
CNA Linux Linux affected 3.13 Not specified
CNA Linux Linux unaffected 3.13 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/d7f474226809471dc7877435e9c492cc914df0bf 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/718747afa5463d9cc5fd9a09f03b2a492edd9b78 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/6c28c31f051dbf49c71ba7ab7bb9bc905fa1d14b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/a0ad0473c09d2e947aecac5c82e637ec85924b12 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/b2da5ed3d8c75e1b729a21b6d3beaed415e263f6 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/3b4e0b0c008a8c1b474730248cd5b873026c74bd 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/cfa643f2ca36c6f913fe1a2ceb12412ebb0fd962 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/9c4e432132a97b82edf28fa172c39f743e6bfb26 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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