xfrm: fix compat ALLOCSPI request use-after-free
Summary
| CVE | CVE-2026-98370 |
|---|---|
| State | PUBLISHED |
| Assigner | Linux |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-10-06 09:18:31 UTC |
| Updated | 2026-10-06 09:18:31 UTC |
| 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. |
Risk And Classification
EPSS: 0.001720000 probability, percentile 0.059360000 (date 2026-10-06)
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Linux | Linux | affected 5f3eea6b7e8f58cf5c8a9d4b9679dc19e9e67ba3 494f2bee9d8d0ebcfa249ac41bed7fed26d119b4 git | Not specified |
| CNA | Linux | Linux | affected 5f3eea6b7e8f58cf5c8a9d4b9679dc19e9e67ba3 17893987e52918c23945c42e47e894a936305a25 git | Not specified |
| CNA | Linux | Linux | affected 5f3eea6b7e8f58cf5c8a9d4b9679dc19e9e67ba3 42971ea17c7a8afc0bdd5ca40648bf4e5bb7b810 git | Not specified |
| CNA | Linux | Linux | affected 5f3eea6b7e8f58cf5c8a9d4b9679dc19e9e67ba3 2b63341e2ebc9b6f73cbd9214dbe7d46dd98c718 git | Not specified |
| CNA | Linux | Linux | affected 5f3eea6b7e8f58cf5c8a9d4b9679dc19e9e67ba3 bb63ab52a18273ec68340ac49aebbaa7b514ccd5 git | Not specified |
| CNA | Linux | Linux | affected 5f3eea6b7e8f58cf5c8a9d4b9679dc19e9e67ba3 248433942155b42a0ef04a5806c8aca024ea7c33 git | Not specified |
| CNA | Linux | Linux | affected 5f3eea6b7e8f58cf5c8a9d4b9679dc19e9e67ba3 e70f639aee2ff0def155c256cace9e0f81d998e2 git | Not specified |
| CNA | Linux | Linux | affected 5f3eea6b7e8f58cf5c8a9d4b9679dc19e9e67ba3 d1ebd9081879fd9ae9c8fb7e8928f19cc88ae320 git | Not specified |
| CNA | Linux | Linux | affected 5.10 | Not specified |
| CNA | Linux | Linux | unaffected 5.10 semver | Not specified |
| CNA | Linux | Linux | unaffected 5.10.271 5.10.* semver | Not specified |
| CNA | Linux | Linux | unaffected 5.15.222 5.15.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.1.189 6.1.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.6.158 6.6.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.12.112 6.12.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.18.54 6.18.* semver | Not specified |
| CNA | Linux | Linux | unaffected 7.2.8 7.2.* semver | Not specified |
| CNA | Linux | Linux | unaffected 7.3-rc4 * original_commit_for_fix | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| git.kernel.org/stable/c/bb63ab52a18273ec68340ac49aebbaa7b514ccd5 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/42971ea17c7a8afc0bdd5ca40648bf4e5bb7b810 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/494f2bee9d8d0ebcfa249ac41bed7fed26d119b4 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/17893987e52918c23945c42e47e894a936305a25 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/248433942155b42a0ef04a5806c8aca024ea7c33 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/e70f639aee2ff0def155c256cace9e0f81d998e2 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/2b63341e2ebc9b6f73cbd9214dbe7d46dd98c718 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/d1ebd9081879fd9ae9c8fb7e8928f19cc88ae320 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
No vendor comments have been submitted for this CVE.
There are currently no legacy QID mappings associated with this CVE.