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CVE-2026-46095: md/md-llbitmap: raise barrier before state machine transition

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-05-27 · updated 2026-06-25

Description

In the Linux kernel, the following vulnerability has been resolved: md/md-llbitmap: raise barrier before state machine transition Move the barrier raise operation before calling llbitmap_state_machine() in both llbitmap_start_write() and llbitmap_start_discard(). This ensures the barrier is in place before any state transitions occur, preventing potential race conditions where the state machine could complete before the barrier is properly raised.

Affected products

• Linux kernel: from 6.18 before 6.18.27; from 6.19 before 7.0.4 — fixed in 6.18.27, 7.0.4

How to fix

Upgrade to a fixed version: Linux kernel 6.18.27, 7.0.4. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/9142f00a9287ca38152717e3e88a033a27774e7f
• https://git.kernel.org/stable/c/9701d51dd378380ba05293fa391e8ba01065ae8d
• https://git.kernel.org/stable/c/ef4ca3d4bf09716cff9ba00eb0351deadc8417ab

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