CVE-2026-74374 md/raid1,raid10: fix error-path detection with md_cloned_bio()
A flaw in Linux kernel RAID1/10 error handling can cause deadlocks under memory pressure, leading to denial of service.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-74374?
CVE-2026-74374 is a high-severity denial of service vulnerability in Linux, published on 15 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
md/raid1,raid10: fix error-path detection with md_cloned_bio()
Detect the error path using md_cloned_bio() instead of relying on r1_bio in raid1 or r10_bio->read_slot in raid10, which may be NULL or -1 after splitting and resubmitting a failed bio.
As a result, the error path may not be recognized and memory allocations can incorrectly use GFP_NOIO instead of (GFP_NOIO | __GFP_HIGH), which can lead to a deadlock under memory pressure.
Which versions are affected by CVE-2026-74374?
How do I fix CVE-2026-74374?
Apply the vendor's patch.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-74374 being exploited?
There is no known exploitation of CVE-2026-74374 in the wild and no public exploit code.
Sources
Also known as AZL-96084, BELL-CVE-2026-74374, DEBIAN-CVE-2026-74374, GHSA-mr8x-hvpc-q7pw, UBUNTU-CVE-2026-74374.