What’s Vulnerable › Vulnerabilities

CVE-2024-43832: s390/uv: Don't call folio_wait_writeback() without a folio reference

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2024-08-17 · updated 2026-08-04

Description

In the Linux kernel, the following vulnerability has been resolved: s390/uv: Don't call folio_wait_writeback() without a folio reference folio_wait_writeback() requires that no spinlocks are held and that a folio reference is held, as documented. After we dropped the PTL, the folio could get freed concurrently. So grab a temporary reference.

Affected products

• Linux kernel: from 5.7 before 6.1.103; from 6.2 before 6.6.44; from 6.7 before 6.10.3 — fixed in 6.1.103, 6.10.3, 6.6.44

How to fix

Upgrade to a fixed version: Linux kernel 6.1.103, 6.10.3, 6.6.44. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/1a1eb2f3fc453dcd52726d13e863938561489cb7
• https://git.kernel.org/stable/c/3f29f6537f54d74e64bac0a390fb2e26da25800d
• https://git.kernel.org/stable/c/8736604ef53359a718c246087cd21dcec232d2fb
• https://git.kernel.org/stable/c/b21aba72aadd94bdac275deab021fc84d6c72b16
• https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html

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