CVE-2026-98591bpf: Fix bounds check for skb-backed dynptrs
- —Not scoredno CVSS score yet
- 0.20%Exploitation in 30 daysEPSS · top 90% 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: bpf: Fix bounds check for skb-backed dynptrs The skb_pointer_if_linear() function checks whether a memory region of length len starting at offset off into the skb is in the linear area, and returns a pointer to the region if so. The check currently subtracts between skb_headlen and offset of the check, and since skb_headlen is unsigned the subtraction can underflow. This causes the bounds check to spuriously pass and generate an arbitrary pointer of the form *(skb->data + off). The only user of this helper is currently skb-backed BPF dynptr code. Returning the wrong pointer leads to the dynptr erroneously being backed with invalid memory. Ensure the subtraction cannot underflow, and fail the check if it would. Use u64 arithmetic to also prevent overflow when calculating (skb_headlen(skb) - off) since off is unsigned.
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)
- 0.20% · top 90% of all CVEs (12 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: Not scored.
Affected products
- affected 6f5a630d7c57cd79b1f526a95e757311e32d41e5 – < 1b923538598be768e9f2f258a77a083d00e0c78b
- affected 6f5a630d7c57cd79b1f526a95e757311e32d41e5 – < 37877a24758068742fef687a7cf5362360dde1d1
- affected 6f5a630d7c57cd79b1f526a95e757311e32d41e5 – < 1196903a27cac5c929c7517e987a8d159f20c5e5
- affected 6f5a630d7c57cd79b1f526a95e757311e32d41e5 – < 39ffceaddb10753eac12785dba6ac0673860b4ac
- affected 6f5a630d7c57cd79b1f526a95e757311e32d41e5 – < ed6eec97b534979dcf28b40c389cee57bd6561d4
- affected 6.6
- unaffected < 6.6
- 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
References5
- https://git.kernel.org/stable/c/1b923538598be768e9f2f258a77a083d00e0c78b (opens in a new tab)
- https://git.kernel.org/stable/c/37877a24758068742fef687a7cf5362360dde1d1 (opens in a new tab)
- https://git.kernel.org/stable/c/1196903a27cac5c929c7517e987a8d159f20c5e5 (opens in a new tab)
- https://git.kernel.org/stable/c/39ffceaddb10753eac12785dba6ac0673860b4ac (opens in a new tab)
- https://git.kernel.org/stable/c/ed6eec97b534979dcf28b40c389cee57bd6561d4 (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-2026-103636 (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-2026-98591)Record last updated .