CVE-2026-31406
- Source
- https://cve.org/CVERecord?id=CVE-2026-31406
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-31406.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2026-31406
- Downstream
- Related
- Published
- 2026-04-06T07:38:18Z
- Modified
- 2026-08-12T03:51:13Z
- Severity
-
- 7.8 (High) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
- Summary
- xfrm: Fix work re-schedule after cancel in xfrm_nat_keepalive_net_fini()
- Details
-
In the Linux kernel, the following vulnerability has been resolved:
xfrm: Fix work re-schedule after cancel in xfrm_nat_keepalive_net_fini()
After cancel_delayed_work_sync() is called from xfrm_nat_keepalive_net_fini(), xfrm_state_fini() flushes remaining states via __xfrm_state_delete(), which calls xfrm_nat_keepalive_state_updated() to re-schedule nat_keepalive_work.
The following is a simple race scenario:
cpu0 cpu1cleanup_net() [Round 1] ops_undo_list() xfrm_net_exit() xfrm_nat_keepalive_net_fini() cancel_delayed_work_sync(nat_keepalive_work); xfrm_state_fini() xfrm_state_flush() xfrm_state_delete(x) __xfrm_state_delete(x) xfrm_nat_keepalive_state_updated(x) schedule_delayed_work(nat_keepalive_work); rcu_barrier(); net_complete_free(); net_passive_dec(net); llist_add(&net->defer_free_list, &defer_free_list);
cleanup_net() [Round 2] rcu_barrier(); net_complete_free() kmem_cache_free(net_cachep, net); nat_keepalive_work() // on freed net
To prevent this, cancel_delayed_work_sync() is replaced with disable_delayed_work_sync().
- Database specific
{ "cna_assigner": "Linux", "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31406.json" }- References
-
- https://git.kernel.org/stable/c/21f2fc49ca6faa393c31da33b8a4e6c41fc84c13
- https://git.kernel.org/stable/c/2255ed6adbc3100d2c4a83abd9d0396d04b87792
- https://git.kernel.org/stable/c/32d0f44c2f14d60fe8e920e69a28c11051543ec1
- https://git.kernel.org/stable/c/daf8e3b253aa760ff9e96c7768a464bc1d6b3c90
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31406.json
- https://nvd.nist.gov/vuln/detail/CVE-2026-31406
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Affected packages
Git / git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Affected ranges
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introducedf531d13bdfe3f4f084aaa8acae2cb0f02295f5aeFixed32d0f44c2f14d60fe8e920e69a28c11051543ec1Fixed2255ed6adbc3100d2c4a83abd9d0396d04b87792Fixed21f2fc49ca6faa393c31da33b8a4e6c41fc84c13Fixeddaf8e3b253aa760ff9e96c7768a464bc1d6b3c90