Linux kernel: rxrpc key ref leak from call->key not released
CVE-2026-31639 Published on April 24, 2026
rxrpc: Fix key reference count leak from call->key
In the Linux kernel, the following vulnerability has been resolved:
rxrpc: Fix key reference count leak from call->key
When creating a client call in rxrpc_alloc_client_call(), the code obtains
a reference to the key. This is never cleaned up and gets leaked when the
call is destroyed.
Fix this by freeing call->key in rxrpc_destroy_call().
Before the patch, it shows the key reference counter elevated:
$ cat /proc/keys | grep afs@54321
1bffe9cd I--Q--i 8053480 4169w 3b010000 1000 1000 rxrpc afs@54321: ka
$
After the patch, the invalidated key is removed when the code exits:
$ cat /proc/keys | grep afs@54321
$
Products Associated with CVE-2026-31639
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Affected Versions
Linux:- Version f3441d4125fc98995858550a5521b8d7daf0504a and below f1a7a3ab0f35f83cf11bba906b9e948cf3788c28 is affected.
- Version f3441d4125fc98995858550a5521b8d7daf0504a and below e6b7943c5dc875647499da09bf4d50a8557ab0c3 is affected.
- Version f3441d4125fc98995858550a5521b8d7daf0504a and below 2e6ef713b1598f6acd7f302fa6b12b6731c89914 is affected.
- Version f3441d4125fc98995858550a5521b8d7daf0504a and below 978108902ee4ef2b348ff7ec36ad014dc5bc6dc6 is affected.
- Version f3441d4125fc98995858550a5521b8d7daf0504a and below d666540d217e8d420544ebdfbadeedd623562733 is affected.
- Version 6.2 is affected.
- Before 6.2 is unaffected.
- Version 6.6.135, <= 6.6.* is unaffected.
- Version 6.12.82, <= 6.12.* is unaffected.
- Version 6.18.23, <= 6.18.* is unaffected.
- Version 6.19.13, <= 6.19.* is unaffected.
- Version 7.0, <= * is unaffected.