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CVE-2026-98573

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

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 5.10.271, 5.15.222, 6.1.189, 6.6.158, 6.12.112, and 2 more
None on Exploit-DB, Metasploit or GitHub

Summary

In 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.

Timeline

  1. CVE published
  2. Record last updated

Affected versions

  • Linux Linux

    From 1431fb31ecbaba1b5718006128f0f2ed0b94e1c3 · fixed in 9c4e432132a97b82edf28fa172c39f743e6bfb26; From 1431fb31ecbaba1b5718006128f0f2ed0b94e1c3 · fixed in 718747afa5463d9cc5fd9a09f03b2a492edd9b78; From 1431fb31ecbaba1b5718006128f0f2ed0b94e1c3 · fixed in a0ad0473c09d2e947aecac5c82e637ec85924b12; From 1431fb31ecbaba1b5718006128f0f2ed0b94e1c3 · fixed in b2da5ed3d8c75e1b729a21b6d3beaed415e263f6; From 1431fb31ecbaba1b5718006128f0f2ed0b94e1c3 · fixed in 6c28c31f051dbf49c71ba7ab7bb9bc905fa1d14b; From 1431fb31ecbaba1b5718006128f0f2ed0b94e1c3 · fixed in cfa643f2ca36c6f913fe1a2ceb12412ebb0fd962; From 1431fb31ecbaba1b5718006128f0f2ed0b94e1c3 · fixed in d7f474226809471dc7877435e9c492cc914df0bf; From 1431fb31ecbaba1b5718006128f0f2ed0b94e1c3 · fixed in 3b4e0b0c008a8c1b474730248cd5b873026c74bd

  • Linux Linux

    3.13

  • KernelLinux

    From 3.13.0 · fixed in 5.10.271; From 5.11.0 · fixed in 5.15.222; From 5.16.0 · fixed in 6.1.189; From 6.2.0 · fixed in 6.6.158; From 6.7.0 · fixed in 6.12.112; From 6.13.0 · fixed in 6.18.55; From 6.19.0 · fixed in 7.2.9

References 8

git.kernel.org