CVE-2026-98573net: skbuff: fix pull-bound underflow in skb_checksum_setup_ipv6()
- —Not scoredno CVSS score yet
- 0.22%Exploitation in 30 daysEPSS · top 88% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
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
ID reserved
By Linux
- 23 days later
· 23 days later
Published
- 1 day later
· 1 day later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
No CVSS score yet: neither the CNA, CISA nor NVD has scored this CVE. NVD status: Received.
- EPSS (exploitation in 30 days)
- 0.22% · top 88% of all CVEs (14 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: Not scored.
Affected products
- affected 1431fb31ecbaba1b5718006128f0f2ed0b94e1c3 – < 9c4e432132a97b82edf28fa172c39f743e6bfb26
- affected 1431fb31ecbaba1b5718006128f0f2ed0b94e1c3 – < 718747afa5463d9cc5fd9a09f03b2a492edd9b78
- affected 1431fb31ecbaba1b5718006128f0f2ed0b94e1c3 – < a0ad0473c09d2e947aecac5c82e637ec85924b12
- affected 1431fb31ecbaba1b5718006128f0f2ed0b94e1c3 – < b2da5ed3d8c75e1b729a21b6d3beaed415e263f6
- affected 1431fb31ecbaba1b5718006128f0f2ed0b94e1c3 – < 6c28c31f051dbf49c71ba7ab7bb9bc905fa1d14b
- affected 1431fb31ecbaba1b5718006128f0f2ed0b94e1c3 – < cfa643f2ca36c6f913fe1a2ceb12412ebb0fd962
- affected 1431fb31ecbaba1b5718006128f0f2ed0b94e1c3 – < d7f474226809471dc7877435e9c492cc914df0bf
- affected 1431fb31ecbaba1b5718006128f0f2ed0b94e1c3 – < 3b4e0b0c008a8c1b474730248cd5b873026c74bd
- affected 3.13
- unaffected < 3.13
- unaffected 5.10.271 – ≤ 5.10.*
- unaffected 5.15.222 – ≤ 5.15.*
- unaffected 6.1.189 – ≤ 6.1.*
- unaffected 6.6.158 – ≤ 6.6.*
- unaffected 6.12.112 – ≤ 6.12.*
- unaffected 6.18.55 – ≤ 6.18.*
- unaffected 7.2.9 – ≤ 7.2.*
- unaffected 7.3 – ≤ *
References
References8
- https://git.kernel.org/stable/c/9c4e432132a97b82edf28fa172c39f743e6bfb26 (opens in a new tab)
- https://git.kernel.org/stable/c/718747afa5463d9cc5fd9a09f03b2a492edd9b78 (opens in a new tab)
- https://git.kernel.org/stable/c/a0ad0473c09d2e947aecac5c82e637ec85924b12 (opens in a new tab)
- https://git.kernel.org/stable/c/b2da5ed3d8c75e1b729a21b6d3beaed415e263f6 (opens in a new tab)
- https://git.kernel.org/stable/c/6c28c31f051dbf49c71ba7ab7bb9bc905fa1d14b (opens in a new tab)
- https://git.kernel.org/stable/c/cfa643f2ca36c6f913fe1a2ceb12412ebb0fd962 (opens in a new tab)
- https://git.kernel.org/stable/c/d7f474226809471dc7877435e9c492cc914df0bf (opens in a new tab)
- https://git.kernel.org/stable/c/3b4e0b0c008a8c1b474730248cd5b873026c74bd (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-103618 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-98573)Record last updated .