What’s Vulnerable › Vulnerabilities

CVE-2024-38663: blk-cgroup: fix list corruption from resetting io stat

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2024-06-24 · updated 2026-08-04

Description

In the Linux kernel, the following vulnerability has been resolved: blk-cgroup: fix list corruption from resetting io stat Since commit 3b8cc6298724 ("blk-cgroup: Optimize blkcg_rstat_flush()"), each iostat instance is added to blkcg percpu list, so blkcg_reset_stats() can't reset the stat instance by memset(), otherwise the llist may be corrupted. Fix the issue by only resetting the counter part.

Affected products

• Linux kernel: from 6.2 before 6.6.33; from 6.7 before 6.9.4 — fixed in 6.6.33, 6.9.4

How to fix

Upgrade to a fixed version: Linux kernel 6.6.33, 6.9.4. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/6da6680632792709cecf2b006f2fe3ca7857e791
• https://git.kernel.org/stable/c/89bb36c72e1951843f9e04dc84412e31fcc849a9
• https://git.kernel.org/stable/c/d4a60298ac34f027a09f8f893fdbd9e06279bb24
• https://git.kernel.org/stable/c/6da6680632792709cecf2b006f2fe3ca7857e791
• https://git.kernel.org/stable/c/89bb36c72e1951843f9e04dc84412e31fcc849a9
• https://git.kernel.org/stable/c/d4a60298ac34f027a09f8f893fdbd9e06279bb24

Get alerted when CVE-2024-38663 or the next vulnerability affects your stack