CVE-2026-98370xfrm: fix compat ALLOCSPI request use-after-free
- —Not scoredno CVSS score yet
- 0.17%Exploitation in 30 daysEPSS · top 94% 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: xfrm: fix compat ALLOCSPI request use-after-free xfrm_state_netlink() builds the ALLOCSPI response with dump_one_state(), which already calls alloc_compat() with the response skb and header. xfrm_alloc_userspi() then calls alloc_compat() again, but passes the original request skb and its header. For a compat request, the translator therefore interprets the 228-byte compat xfrm_userspi_info as the 232-byte native layout and reads four bytes past the declared payload. It also publishes the translated child through the request's frag_list. A multicast clone of the request shares skb_shared_info and can observe that child. xfrm_user_rcv_msg() frees it after the request handler returns, racing a compat receiver which may still be copying from it and resulting in a use-after-free. Remove the redundant conversion. The response keeps its correct compat translation from dump_one_state(), and no child is attached to the inbound request.
Timeline
ID reserved
By Linux
- 11 days later
· 11 days later
Published
- 13 days later
· 13 days 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)
- 0.17% · top 94% 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 5f3eea6b7e8f58cf5c8a9d4b9679dc19e9e67ba3 – < 494f2bee9d8d0ebcfa249ac41bed7fed26d119b4
- affected 5f3eea6b7e8f58cf5c8a9d4b9679dc19e9e67ba3 – < 17893987e52918c23945c42e47e894a936305a25
- affected 5f3eea6b7e8f58cf5c8a9d4b9679dc19e9e67ba3 – < 42971ea17c7a8afc0bdd5ca40648bf4e5bb7b810
- affected 5f3eea6b7e8f58cf5c8a9d4b9679dc19e9e67ba3 – < 2b63341e2ebc9b6f73cbd9214dbe7d46dd98c718
- affected 5f3eea6b7e8f58cf5c8a9d4b9679dc19e9e67ba3 – < bb63ab52a18273ec68340ac49aebbaa7b514ccd5
- affected 5f3eea6b7e8f58cf5c8a9d4b9679dc19e9e67ba3 – < 248433942155b42a0ef04a5806c8aca024ea7c33
- affected 5f3eea6b7e8f58cf5c8a9d4b9679dc19e9e67ba3 – < e70f639aee2ff0def155c256cace9e0f81d998e2
- affected 5f3eea6b7e8f58cf5c8a9d4b9679dc19e9e67ba3 – < d1ebd9081879fd9ae9c8fb7e8928f19cc88ae320
- affected 5.10
- unaffected < 5.10
- 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 6.18.54 – ≤ 6.18.*
- unaffected 7.2.8 – ≤ 7.2.*
- unaffected 7.3 – ≤ *
References
References8
- https://git.kernel.org/stable/c/494f2bee9d8d0ebcfa249ac41bed7fed26d119b4 (opens in a new tab)
- https://git.kernel.org/stable/c/17893987e52918c23945c42e47e894a936305a25 (opens in a new tab)
- https://git.kernel.org/stable/c/42971ea17c7a8afc0bdd5ca40648bf4e5bb7b810 (opens in a new tab)
- https://git.kernel.org/stable/c/2b63341e2ebc9b6f73cbd9214dbe7d46dd98c718 (opens in a new tab)
- https://git.kernel.org/stable/c/bb63ab52a18273ec68340ac49aebbaa7b514ccd5 (opens in a new tab)
- https://git.kernel.org/stable/c/248433942155b42a0ef04a5806c8aca024ea7c33 (opens in a new tab)
- https://git.kernel.org/stable/c/e70f639aee2ff0def155c256cace9e0f81d998e2 (opens in a new tab)
- https://git.kernel.org/stable/c/d1ebd9081879fd9ae9c8fb7e8928f19cc88ae320 (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-2026-93355 (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)
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[](https://cveledger.app/cve/CVE-2026-98370)Record last updated .