SB20260815306 - Race condition in Linux kernel md driver

Description

This security bulletin contains information about 1 vulnerability.

1) Race condition (CVE-ID: CVE-2026-72420)

CWE-ID: CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

CVSSv4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to a data race in break_stripe_batch_list() and raid5_make_request() in the md/raid5 subsystem when handling overlapping stripe I/O requests. A local user can submit crafted I/O that triggers the R5_Overlap flag race to cause a denial of service.

The issue can leave a task waiting on a bit indefinitely.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/4d919c9b770996365806b6c8d701912d52baa306
• https://git.kernel.org/stable/c/55b77337bdd088c77461588e5ec094421b89911b
• https://git.kernel.org/stable/c/8031b0d02bd221a5f9add4357e291fc2a527b83a
• https://git.kernel.org/stable/c/d684b72dfbd320623ccaab0779aa841190488e7c