Medium 5.5Published Feb 12, 2025

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

Updated under an hour ago (Oct 27, 2026, 11:00 PM ET)

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Exploited in the last 30 days

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.

CVSS: 5.5 MEDIUM (v3.1, CISA ADP)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Modified
Record last updated: Oct 14, 2026
First seen by InfoSec Signals: Oct 14, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	803d5a33d5ffdc2d86dcc0cfa01655a330612cdb builds before 84c4ed15626574c9ac6c1039ba9c137a77bcc7f2; from 70c1835e776c8447c1aca87ddb38cfe764fe756a before 80da29deb88a3a907441fc35bb7bac309f31e713; from e1b160a50c756e0efbea290b9bf5117cb80e8c4b before 649b266606bc413407ce315f710c8ce8a88ee30a; from a373ad833a6bfe4bc6cedcf7e56a99cc6fd9a193 before 65c367bd9d4f43513c7f837df5753bea9561b836; from 518fbd644dabb6aedbdd4939c6c9cc1bf651459f before a5a2ee8144c3897d37403a69118c3e3dc5713958; from 5cbcb62dddf5346077feb82b7b0c9254222d3445 before 80828540dad0757b6337c6561d49c81038f38d87; from 5cbcb62dddf5346077feb82b7b0c9254222d3445 before cbc5dde0a461240046e8a41c43d7c3b76d5db952; 7bdf1d550ddfcd9ab797087421f77b7aceddc8a7; and 8 more ranges	CNA record
Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518_4_pn_dp_mfp (from the name)	from V3.1.0 before V3.1.5	CISA ADP
Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518f_4_pn_dp_mfp (from the name)	from V3.1.0 before V3.1.5	CISA ADP
Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem siemens:simatic_s7_1500_tm_mfp_gnu_linux_subsystem (from the name)	all versions	CISA ADP
Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP siemens:siplus_s7_1500_cpu_1518_4_pn_dp_mfp (from the name)	from V3.1.0 before V3.1.5	CISA ADP
Siemens RUGGEDCOM RST2428P siemens:ruggedcom_rst2428p (from the name)	before V3.2	CISA ADP
Siemens SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 family siemens:scalance_xc_300_xr_300_xc_400_xr_500wg_xr_500_family (from the name)	before V3.2	CISA ADP
Siemens SCALANCE XCM-/XRM-/XCH-/XRH-300 family siemens:scalance_xcm_xrm_xch_xrh_300_family (from the name)	before V3.2	CISA ADP
linux linux_kernel linux:linux_kernel	from 4.19.317 before 4.20; from 5.4.279 before 5.4.290; from 5.10.221 before 5.10.234; from 5.15.162 before 5.15.177; from 6.1.95 before 6.1.127; from 6.6.35 before 6.6.74; from 6.9.6 before 6.12.11; 6.13; and 6 more ranges	NVD

References

References

https://git.kernel.org/stable/c/84c4ed15626574c9ac6c1039ba9c137a77bcc7f2	patch
https://git.kernel.org/stable/c/80da29deb88a3a907441fc35bb7bac309f31e713	patch
https://git.kernel.org/stable/c/649b266606bc413407ce315f710c8ce8a88ee30a	patch
https://git.kernel.org/stable/c/65c367bd9d4f43513c7f837df5753bea9561b836	patch
https://git.kernel.org/stable/c/a5a2ee8144c3897d37403a69118c3e3dc5713958	patch
https://git.kernel.org/stable/c/80828540dad0757b6337c6561d49c81038f38d87	patch
https://git.kernel.org/stable/c/cbc5dde0a461240046e8a41c43d7c3b76d5db952	patch
https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html
https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html
https://cert-portal.siemens.com/productcert/html/ssa-265688.html
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The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.