CVE-2026-31406

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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
2026-04-06T07:38:18.840Z
Modified
2026-07-15T01:48:52.226400602Z
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 xfrmnatkeepalivenetfini()

After canceldelayedworksync() is called from xfrmnatkeepalivenetfini(), xfrmstate_fini() flushes remaining states via __xfrmstatedelete(), which calls xfrmnatkeepalivestateupdated() to re-schedule natkeepalivework.

The following is a simple race scenario:

       cpu0                             cpu1

cleanupnet() [Round 1] opsundolist() xfrmnetexit() xfrmnatkeepalivenetfini() canceldelayedworksync(natkeepalivework); xfrmstatefini() xfrmstateflush() xfrmstatedelete(x) __xfrmstatedelete(x) xfrmnatkeepalivestateupdated(x) scheduledelayedwork(natkeepalivework); rcubarrier(); netcompletefree(); netpassivedec(net); llistadd(&net->deferfreelist, &deferfreelist);

cleanupnet() [Round 2] rcubarrier(); netcompletefree() kmemcachefree(netcachep, net); natkeepalive_work() // on freed net

To prevent this, canceldelayedworksync() is replaced with disabledelayedworksync().

Database specific 
{
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31406.json",
    "cna_assigner": "Linux"
}
References

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
Introduced
f531d13bdfe3f4f084aaa8acae2cb0f02295f5ae
Fixed
32d0f44c2f14d60fe8e920e69a28c11051543ec1
Fixed
2255ed6adbc3100d2c4a83abd9d0396d04b87792
Fixed
21f2fc49ca6faa393c31da33b8a4e6c41fc84c13
Fixed
daf8e3b253aa760ff9e96c7768a464bc1d6b3c90

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-31406.json"

Linux / Kernel

Package

Name
Kernel

Affected ranges

Type
ECOSYSTEM
Events
Introduced
6.11.0
Fixed
6.12.80
Type
ECOSYSTEM
Events
Introduced
6.13.0
Fixed
6.18.21
Type
ECOSYSTEM
Events
Introduced
6.19.0
Fixed
6.19.11

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-31406.json"