Deadlock The advisory has been revoked - it doesn't affect any version of package rtla (opens in a new tab)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-RHEL10-RTLA-14966901
- published16 Jan 2026
- disclosed1 Jan 2025
Introduced: 1 Jan 2025
CVE-2025-68768 (opens in a new tab)Amendment
The Red Hat security team deemed this advisory irrelevant for RHEL:10.
NVD Description
Note: Versions mentioned in the description apply only to the upstream rtla package and not the rtla package as distributed by RHEL.
In the Linux kernel, the following vulnerability has been resolved:
inet: frags: flush pending skbs in fqdir_pre_exit()
We have been seeing occasional deadlocks on pernet_ops_rwsem since September in NIPA. The stuck task was usually modprobe (often loading a driver like ipvlan), trying to take the lock as a Writer. lockdep does not track readers for rwsems so the read wasn't obvious from the reports.
On closer inspection the Reader holding the lock was conntrack looping forever in nf_conntrack_cleanup_net_list(). Based on past experience with occasional NIPA crashes I looked thru the tests which run before the crash and noticed that the crash follows ip_defrag.sh. An immediate red flag. Scouring thru (de)fragmentation queues reveals skbs sitting around, holding conntrack references.
The problem is that since conntrack depends on nf_defrag_ipv6, nf_defrag_ipv6 will load first. Since nf_defrag_ipv6 loads first its netns exit hooks run after conntrack's netns exit hook.
Flush all fragment queue SKBs during fqdir_pre_exit() to release conntrack references before conntrack cleanup runs. Also flush the queues in timer expiry handlers when they discover fqdir->dead is set, in case packet sneaks in while we're running the pre_exit flush.
The commit under Fixes is not exactly the culprit, but I think previously the timer firing would eventually unblock the spinning conntrack.
References
- https://bugzilla.redhat.com/show_bug.cgi?id=2429092
- https://access.redhat.com/security/cve/CVE-2025-68768
- https://git.kernel.org/stable/c/006a5035b495dec008805df249f92c22c89c3d2e
- https://git.kernel.org/stable/c/c70df25214ac9b32b53e18e6ae3b8f073ffa6903
- https://git.kernel.org/stable/c/543555954b1ee8d1903a7020324efb41b0c97428
- https://git.kernel.org/stable/c/22ee4010866da81aeee08e1ea3fddbe418feb212