CVE-2026-31450 Linux CVE debrief

Who should care

Linux kernel developers, Linux distribution maintainers, organizations using Linux-based systems, and security teams responsible for vulnerability management should be aware of this vulnerability and take steps to mitigate it. Affected kernel versions include 3.11.1 to 5.10.253, 5.11 to 5.15.203, 5.16 to 6.1.168, 6.2 to 6.6.134, 6.7 to 6.12.81, 6.13 to 6.18.21, and 6.19 to 6.19.11.

Technical summary

The vulnerability exists in the ext4_inode_attach_jinode() function, where ei->jinode is published to concurrent users before initialization. This can cause a crash when the fast commit flush path passes this jinode to jbd2_wait_inode_data(). The issue was resolved by initializing the jbd2_inode first and using smp_wmb() and WRITE_ONCE() to publish ei->jinode after initialization. Affected kernel versions include 3.11.1 to 5.10.253, 5.11 to 5.15.203, 5.16 to 6.1.168, 6.2 to 6.6.134, 6.7 to 6.12.81, 6.13 to 6.18.21, and 6.19 to 6.19.11.

Defensive priority

High

Recommended defensive actions

• Apply patches from Linux kernel maintainers
• Update Linux kernel to a version that includes the fix
• Monitor Linux kernel updates for future vulnerabilities
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE record was published on 2026-04-22T14:16:39.083Z and last modified on 2026-07-14T13:18:42.207Z. The NVD entry is currently Modified. Linux kernel developers and users should verify their systems for exposure and apply patches or mitigations as needed. Evidence limits suggest that affected scope and severity may vary based on specific kernel versions and configurations.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.