What’s Vulnerable › Vulnerabilities

CVE-2026-74376: md/raid10: reset read_slot when reusing r10bio for discard

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-15 · updated 2026-10-16

Description

In the Linux kernel, the following vulnerability has been resolved: md/raid10: reset read_slot when reusing r10bio for discard put_all_bios() always drops devs[i].bio, but it only drops devs[i].repl_bio when r10_bio->read_slot < 0. If discard reuses an r10bio that was previously used for a read, read_slot can still be non-negative, and discard cleanup can skip bio_put() on repl_bio. Reset read_slot to -1 when preparing an r10bio for discard so the replacement bio is always released correctly.

Affected products

• Linux kernel: 5.13 — fixed in 7.2

How to fix

Upgrade to a fixed version: Linux kernel 7.2. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/3cb2a606ce4902eceabe68338df0653312f861f8
• https://git.kernel.org/stable/c/561c9711e4f545d6464a023168bdee03b00fa945
• https://git.kernel.org/stable/c/6b8a26af065ddc93de2aa5c9f0df98dce9723442
• https://git.kernel.org/stable/c/742e4afd247d9c972695227716b03d432a7e1d26
• https://git.kernel.org/stable/c/b7313f23ea5a79b199a007bfad64a866cc2c22e7
• https://git.kernel.org/stable/c/ce3030e92f14362880055de5fe3c258971118853
• https://git.kernel.org/stable/c/eb04e3e9c14ed15914f5fd2eae8b6435f54f095f

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