CVE-2026-98573net: skbuff: fix pull-bound underflow in skb_checksum_setup_ipv6()
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- Not yet scored
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Received
- Record last updated
- Oct 19, 2026
- First seen by InfoSec Signals
- Oct 18, 2026
Affected products
Linux Linux linux:linux (from the name) | 1431fb31ecbaba1b5718006128f0f2ed0b94e1c3 builds before 9c4e432132a97b82edf28fa172c39f743e6bfb26; from 1431fb31ecbaba1b5718006128f0f2ed0b94e1c3 before 718747afa5463d9cc5fd9a09f03b2a492edd9b78; from 1431fb31ecbaba1b5718006128f0f2ed0b94e1c3 before a0ad0473c09d2e947aecac5c82e637ec85924b12; from 1431fb31ecbaba1b5718006128f0f2ed0b94e1c3 before b2da5ed3d8c75e1b729a21b6d3beaed415e263f6; 1431fb31ecbaba1b5718006128f0f2ed0b94e1c3 builds before 6c28c31f051dbf49c71ba7ab7bb9bc905fa1d14b; from 1431fb31ecbaba1b5718006128f0f2ed0b94e1c3 before cfa643f2ca36c6f913fe1a2ceb12412ebb0fd962; from 1431fb31ecbaba1b5718006128f0f2ed0b94e1c3 before d7f474226809471dc7877435e9c492cc914df0bf; 1431fb31ecbaba1b5718006128f0f2ed0b94e1c3 builds before 3b4e0b0c008a8c1b474730248cd5b873026c74bd | CNA record |
References
- https://git.kernel.org/stable/c/9c4e432132a97b82edf28fa172c39f743e6bfb26
- https://git.kernel.org/stable/c/718747afa5463d9cc5fd9a09f03b2a492edd9b78
- https://git.kernel.org/stable/c/a0ad0473c09d2e947aecac5c82e637ec85924b12
- https://git.kernel.org/stable/c/b2da5ed3d8c75e1b729a21b6d3beaed415e263f6
- https://git.kernel.org/stable/c/6c28c31f051dbf49c71ba7ab7bb9bc905fa1d14b
- https://git.kernel.org/stable/c/cfa643f2ca36c6f913fe1a2ceb12412ebb0fd962
- https://git.kernel.org/stable/c/d7f474226809471dc7877435e9c492cc914df0bf
- https://git.kernel.org/stable/c/3b4e0b0c008a8c1b474730248cd5b873026c74bd
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.