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CVE-2025-21694fs/proc: fix softlockup in __read_vmcore (part 2)

Description

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. ID reserved

    By Linux

  2. · 45 days later

    Published

  3. · 20 months later

    Record updated

Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.

Scores

CVSS scores of CVE-2025-21694, by who scored it
Scored byCVSSScoreVector
CISA-ADPADP (enrichment)3.1Medium5.5CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
NVDNVD · Modified3.1Medium5.5CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
EPSS (exploitation in 30 days)
0.24% · top 84% of all CVEs (13 Nov 2026)
CISA SSVC
Exploitation: none · Automatable: no · Technical impact: partial
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.5.

Affected products

  • Linux · Linux

    • affected 803d5a33d5ffdc2d86dcc0cfa01655a330612cdb – < 84c4ed15626574c9ac6c1039ba9c137a77bcc7f2
    • affected 70c1835e776c8447c1aca87ddb38cfe764fe756a – < 80da29deb88a3a907441fc35bb7bac309f31e713
    • affected e1b160a50c756e0efbea290b9bf5117cb80e8c4b – < 649b266606bc413407ce315f710c8ce8a88ee30a
    • affected a373ad833a6bfe4bc6cedcf7e56a99cc6fd9a193 – < 65c367bd9d4f43513c7f837df5753bea9561b836
    • affected 518fbd644dabb6aedbdd4939c6c9cc1bf651459f – < a5a2ee8144c3897d37403a69118c3e3dc5713958
    • affected 5cbcb62dddf5346077feb82b7b0c9254222d3445 – < 80828540dad0757b6337c6561d49c81038f38d87
    • affected 5cbcb62dddf5346077feb82b7b0c9254222d3445 – < cbc5dde0a461240046e8a41c43d7c3b76d5db952
    • affected 7bdf1d550ddfcd9ab797087421f77b7aceddc8a7
    • affected e8780e8a0e25dc4c3927f611ec8970d26c0c7369
    • affected 5.4.279 – < 5.4.290
    • affected 5.10.221 – < 5.10.234
    • affected 5.15.162 – < 5.15.177
    • affected 6.1.95 – < 6.1.127
    • affected 6.6.35 – < 6.6.74
    • affected 4.19.317 – < 4.20
    • affected 6.9.6 – < 6.10

  • Linux · Linux

    • affected 6.10
    • unaffected < 6.10
    • unaffected 5.4.290 – ≤ 5.4.*
    • unaffected 5.10.234 – ≤ 5.10.*
    • unaffected 5.15.177 – ≤ 5.15.*
    • unaffected 6.1.127 – ≤ 6.1.*
    • unaffected 6.6.74 – ≤ 6.6.*
    • unaffected 6.12.11 – ≤ 6.12.*
    • unaffected 6.13 – ≤ *

References

References12

Sources

The same CVE in the primary databases and aggregators, to check against.

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Record last updated .