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CVE-2025-21694

fs/proc: fix softlockup in __read_vmcore (part 2)

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 5.4.290, 5.10.234, 5.15.177, 6.1.127, 6.6.74, and 3 more
None on Exploit-DB, Metasploit or GitHub
  • Exploitation: none
  • Automatable: no
  • Technical impact: partial

Summary

In the Linux kernel, the following vulnerability has been resolved: fs/proc: fix softlockup in __read_vmcore (part 2) Since commit 5cbcb62dddf5 ("fs/proc: fix softlockup in __read_vmcore") the number of softlockups in __read_vmcore at kdump time have gone down, but they still happen sometimes. In a memory constrained environment like the kdump image, a softlockup is not just a harmless message, but it can interfere with things like RCU freeing memory, causing the crashdump to get stuck. The second loop in __read_vmcore has a lot more opportunities for natural sleep points, like scheduling out while waiting for a data write to happen, but apparently that is not always enough. Add a cond_resched() to the second loop in __read_vmcore to (hopefully) get rid of the softlockups.

Timeline

  1. CVE published
  2. CISA SSVC assessment

    Exploitation: none · Automatable: no · Technical impact: partial

  3. Record last updated

Affected versions

  • Linux Linux

    From 803d5a33d5ffdc2d86dcc0cfa01655a330612cdb · fixed in 84c4ed15626574c9ac6c1039ba9c137a77bcc7f2; From 70c1835e776c8447c1aca87ddb38cfe764fe756a · fixed in 80da29deb88a3a907441fc35bb7bac309f31e713; From e1b160a50c756e0efbea290b9bf5117cb80e8c4b · fixed in 649b266606bc413407ce315f710c8ce8a88ee30a; From a373ad833a6bfe4bc6cedcf7e56a99cc6fd9a193 · fixed in 65c367bd9d4f43513c7f837df5753bea9561b836; From 518fbd644dabb6aedbdd4939c6c9cc1bf651459f · fixed in a5a2ee8144c3897d37403a69118c3e3dc5713958; From 5cbcb62dddf5346077feb82b7b0c9254222d3445 · fixed in 80828540dad0757b6337c6561d49c81038f38d87; From 5cbcb62dddf5346077feb82b7b0c9254222d3445 · fixed in cbc5dde0a461240046e8a41c43d7c3b76d5db952; From 5.4.279 · fixed in 5.4.290; From 5.10.221 · fixed in 5.10.234; From 5.15.162 · fixed in 5.15.177; From 6.1.95 · fixed in 6.1.127; From 6.6.35 · fixed in 6.6.74; From 4.19.317 · fixed in 4.20; From 6.9.6 · fixed in 6.10

  • Linux Linux

    6.10

  • KernelLinux

    fixed in 5.4.290; From 5.5.0 · fixed in 5.10.234; From 5.11.0 · fixed in 5.15.177; From 5.16.0 · fixed in 6.1.127; From 6.2.0 · fixed in 6.6.74; From 6.7.0 · fixed in 6.12.11

References 7

git.kernel.org