mm/swap: add cond_resched() in swap_reclaim_full_clusters to prevent softlockup (CVE-2026-64415) | HOL Guard CVE

Medium · CVSS 5.5CVE-2026-64415

mm/swap: add cond_resched() in swap_reclaim_full_clusters to prevent softlockup

Answer in brief

CVE-2026-64415 records a Medium severity (CVSS 5.5) vulnerability in mm/swap: add cond_resched() in swap_reclaim_full_clusters to prevent softlockup. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Jul 25, 2026Updated Sep 4, 2026Source checked Oct 1, 2026First seen by HOL Aug 11, 2026Material review Sep 4, 2026

Upstream Advisory

Key facts

Risk: Medium · CVSS 5.5
Exploitation: Not marked as known exploited
Affected software: 6 mapped packages or products
Fix availability: Available

Why this deserves its current priority

CVSS is 5.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Affected products and reported versions
Product	Affected versions	Fixed versions
cpe:2.3:o:linux:linux_kernel::::::::	Not reported	Not reported
cpe:2.3:o:linux:linux_kernel:6.12:-::::::	Not reported	Not reported
cpe:2.3:o:linux:linux_kernel:6.12:rc6::::::	Not reported	Not reported
cpe:2.3:o:linux:linux_kernel:6.12:rc7::::::	Not reported	Not reported

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Linux/Linuxgeneric	>=5168a68eb78fa1c67a8b2d31d0642c7fd866cc12 <60cbe67d1342f34b66df1c2ee328e3cd333767d7 \|\| >=5168a68eb78fa1c67a8b2d31d0642c7fd866cc12 <69c0e6246575b780ae0d3f411c749bcf13c221f3 \|\| >=5168a68eb78fa1c67a8b2d31d0642c7fd866cc12 <2a55fdf9f746a1a6ced7fd62ea1080b8a917e0b0 \|\| >=5168a68eb78fa1c67a8b2d31d0642c7fd866cc12 <66366d291f666ddeda5f8c84f253e308de3e6b55	60cbe67d1342f34b66df1c2ee328e3cd333767d7, 69c0e6246575b780ae0d3f411c749bcf13c221f3, 2a55fdf9f746a1a6ced7fd62ea1080b8a917e0b0, 66366d291f666ddeda5f8c84f253e308de3e6b55
Linux/Linuxgeneric	6.12	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to 60cbe67d1342f34b66df1c2ee328e3cd333767d7 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Jul 25, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 4, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Aug 11, 2026

Sources and claim methodology

Upstream source description

In the Linux kernel, the following vulnerability has been resolved: mm/swap: add cond_resched() in swap_reclaim_full_clusters to prevent softlockup We hit a real softlockup in an internal stress test environment. The workload was LTP memory/swap stress on a large arm64 machine, with 320 CPUs, about 1TB memory and an 8.6GB swap device. The system was under heavy load and the swap device had a large number of full clusters. The softlockup was triggered during a stress test after about 3 days. So, add periodic cond_resched() calls during large full_clusters reclaim operations to prevent softlockup issues. Detailed call trace as follow: PID: 3817773 TASK: ffff0883bb28b780 CPU: 48 COMMAND: "kworker/48:7" #0 [ffff800080183d10] __crash_kexec at ffffa4c1361e5de4 #1 [ffff800080183d90] panic at ffffa4c1360d5e9c #2 [ffff800080183e20] watchdog_timer_fn at ffffa4c136231fa8 ... #16 [ffff8000c4ad3cb0] swap_cache_del_folio at ffffa4c1363e1614 #17 [ffff8000c4ad3ce0] __try_to_reclaim_swap at ffffa4c1363e4bfc #18 [ffff8000c4ad3d40] swap_reclaim_full_clusters at ffffa4c1363e5474 #19 [ffff8000c4ad3da0] swap_reclaim_work at ffffa4c1363e550c #20 [ffff8000c4ad3dc0] process_one_work at ffffa4c136102edc #21 [ffff8000c4ad3e10] worker_thread at ffffa4c136103398 #22 [ffff8000c4ad3e70] kthread at ffffa4c13610d95c

Quoted source text, attributed separately from HOL analysis.