CVE-2026-64415 Details
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
A softlockup vulnerability has been identified in the Linux kernel's memory and swap management. This issue occurs in the 'swap_reclaim_full_clusters' function, where the system can become unresponsive under heavy load, particularly on large arm64 machines with 320 CPUs, approximately 1TB of memory, and an 8.6GB swap device. The problem was revealed during an internal stress test, which simulated intense memory and swap usage. After about three days of testing, the system experienced a real softlockup, causing a panic and triggering the crash handling process. The root cause was linked to the swap device having a large number of full clusters, which led to over-reclamation and the subsequent softlockup.
The vulnerability has been addressed by adding periodic 'cond_resched()' calls during the reclamation of full swap clusters. Users can apply the latest patches available in the Linux kernel stable tree to mitigate this issue.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
No SSVC data is available for this CVE.
References to Advisories, Solutions, and Tools
By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.
| URL | Source(s) | Tag(s) |
|---|---|---|
| https://git.kernel.org/stable/c/2a55fdf9f746a1a6ced7fd62ea1080b8a917e0b0 | kernel.org | Patch |
| https://git.kernel.org/stable/c/60cbe67d1342f34b66df1c2ee328e3cd333767d7 | kernel.org | Patch |
| https://git.kernel.org/stable/c/66366d291f666ddeda5f8c84f253e308de3e6b55 | kernel.org | Patch |
| https://git.kernel.org/stable/c/69c0e6246575b780ae0d3f411c749bcf13c221f3 | kernel.org | Patch |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-667 | Improper Locking | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| linux linux kernel | >= 6.12.1, < 6.12.96 >= 6.13, < 6.18.39 >= 6.19, < 7.1.4 6.12 - 6.12 rc6 6.12 rc7 |
CPE
Remediation
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Change History
3 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Sep 4, 2026 | Initial Analysis | [email protected] |
| Aug 17, 2026 | CVE Modified | kernel.org |
| Jul 25, 2026 | New CVE Received | kernel.org |