What’s Vulnerable › Vulnerabilities

CVE-2026-45953: md/raid5: fix IO hang with degraded array with llbitmap

• 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 2026-06-17

Description

In the Linux kernel, the following vulnerability has been resolved: md/raid5: fix IO hang with degraded array with llbitmap When llbitmap bit state is still unwritten, any new write should force rcw, as bitmap_ops->blocks_synced() is checked in handle_stripe_dirtying(). However, later the same check is missing in need_this_block(), causing stripe to deadloop during handling because handle_stripe() will decide to go to handle_stripe_fill(), meanwhile need_this_block() always return 0 and nothing is handled.

Affected products

• Linux kernel: from 6.18 before 6.18.14; from 6.19 before 6.19.4 — fixed in 6.18.14, 6.19.4

How to fix

Upgrade to a fixed version: Linux kernel 6.18.14, 6.19.4. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/28ef299e7a5b81817f8ca8297c2ddff28f5da5e8
• https://git.kernel.org/stable/c/870b9f15867b0e70f3459ef3974b043e8b229690
• https://git.kernel.org/stable/c/cd1635d844d26471c56c0a432abdee12fc9ad735

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