CVE-2023-52932: mm/swapfile: add cond_resched() in get_swap_pages()

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: 2025-03-27 · updated 2026-06-17
Weakness: CWE-667

Description

In the Linux kernel, the following vulnerability has been resolved: mm/swapfile: add cond_resched() in get_swap_pages() The softlockup still occurs in get_swap_pages() under memory pressure. 64 CPU cores, 64GB memory, and 28 zram devices, the disksize of each zram device is 50MB with same priority as si. Use the stress-ng tool to increase memory pressure, causing the system to oom frequently. The plist_for_each_entry_safe() loops in get_swap_pages() could reach tens of thousands of times to find available space (extreme case: cond_resched() is not called in scan_swap_map_slots()). Let's add cond_resched() into get_swap_pages() when failed to find available space to avoid softlockup.

Affected products

Linux kernel: before 4.14.306; from 4.15 before 4.19.273; from 4.20 before 5.4.232; from 5.5 before 5.10.168; from 5.11 before 5.15.93; from 5.16 before 6.1.11 — fixed in 4.14.306, 4.19.273, 5.10.168, 5.15.93, 5.4.232, 6.1.11

How to fix

Upgrade to a fixed version: Linux kernel 4.14.306, 4.19.273, 5.10.168, 5.15.93. Check the vendor advisory for mitigations.

References

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