What’s Vulnerable › Vulnerabilities

CVE-2024-49855: nbd: fix race between timeout and normal completion

• Severity: high (CVSS 7.0 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: 2024-10-21 · updated 2026-08-04
• Weakness: CWE-416

Description

In the Linux kernel, the following vulnerability has been resolved: nbd: fix race between timeout and normal completion If request timetout is handled by nbd_requeue_cmd(), normal completion has to be stopped for avoiding to complete this requeued request, other use-after-free can be triggered. Fix the race by clearing NBD_CMD_INFLIGHT in nbd_requeue_cmd(), meantime make sure that cmd->lock is grabbed for clearing the flag and the requeue.

Affected products

• Linux kernel: from 5.18.4 before 5.19; from 5.19 before 6.1.113; from 6.2 before 6.6.54; from 6.7 before 6.10.13; from 6.11 before 6.11.2; 5.17.15 — fixed in 5.19, 6.1.113, 6.10.13, 6.11.2, 6.6.54

How to fix

Upgrade to a fixed version: Linux kernel 5.19, 6.1.113, 6.10.13, 6.11.2. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/5236ada8ebbd9e7461f17477357582f5be4f46f7
• https://git.kernel.org/stable/c/6e73b946a379a1dfbb62626af93843bdfb53753d
• https://git.kernel.org/stable/c/9a74c3e6c0d686c26ba2aab66d15ddb89dc139cc
• https://git.kernel.org/stable/c/9c25faf72d780a9c71081710cd48759d61ff6e9b
• https://git.kernel.org/stable/c/c9ea57c91f03bcad415e1a20113bdb2077bcf990
• https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html

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