Answer in brief
CVE-2025-21694 records a Medium severity (CVSS 5.5) vulnerability in fs/proc: fix softlockup in __read_vmcore (part 2). The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic), Siemens/RUGGEDCOM RST2428P (generic), Siemens/SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 family (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
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.
The current feed maps Linux/Linux (generic), Linux/Linux (generic), Siemens/RUGGEDCOM RST2428P (generic), Siemens/SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 family (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | 6.10 | Not reported |
| Linux/Linuxgeneric | >=803d5a33d5ffdc2d86dcc0cfa01655a330612cdb <84c4ed15626574c9ac6c1039ba9c137a77bcc7f2 || >=70c1835e776c8447c1aca87ddb38cfe764fe756a <80da29deb88a3a907441fc35bb7bac309f31e713 || >=e1b160a50c756e0efbea290b9bf5117cb80e8c4b <649b266606bc413407ce315f710c8ce8a88ee30a || >=a373ad833a6bfe4bc6cedcf7e56a99cc6fd9a193 <65c367bd9d4f43513c7f837df5753bea9561b836 || >=518fbd644dabb6aedbdd4939c6c9cc1bf651459f <a5a2ee8144c3897d37403a69118c3e3dc5713958 || >=5cbcb62dddf5346077feb82b7b0c9254222d3445 <80828540dad0757b6337c6561d49c81038f38d87 || >=5cbcb62dddf5346077feb82b7b0c9254222d3445 <cbc5dde0a461240046e8a41c43d7c3b76d5db952 || 7bdf1d550ddfcd9ab797087421f77b7aceddc8a7 || e8780e8a0e25dc4c3927f611ec8970d26c0c7369 || >=5.4.279 <5.4.290 || >=5.10.221 <5.10.234 || >=5.15.162 <5.15.177 || >=6.1.95 <6.1.127 || >=6.6.35 <6.6.74 || >=4.19.317 <4.20 || >=6.9.6 <6.10 | 84c4ed15626574c9ac6c1039ba9c137a77bcc7f2, 80da29deb88a3a907441fc35bb7bac309f31e713, 649b266606bc413407ce315f710c8ce8a88ee30a, 65c367bd9d4f43513c7f837df5753bea9561b836, a5a2ee8144c3897d37403a69118c3e3dc5713958, 80828540dad0757b6337c6561d49c81038f38d87, cbc5dde0a461240046e8a41c43d7c3b76d5db952, 5.4.290, 5.10.234, 5.15.177, 6.1.127, 6.6.74, 4.20, 6.10 |
| Siemens/RUGGEDCOM RST2428Pgeneric | >=0 <V3.2 | V3.2 |
| Siemens/SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 familygeneric | >=0 <V3.2 | V3.2 |
| Siemens/SCALANCE XCM-/XRM-/XCH-/XRH-300 familygeneric | >=0 <V3.2 | V3.2 |
| Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFPgeneric | >=V3.1.0 <V3.1.5 | V3.1.5 |
| Siemens/SIMATIC S7-1500 CPU 1518F-4 PN/DP MFPgeneric | >=V3.1.0 <V3.1.5 | V3.1.5 |
| Siemens/SIMATIC S7-1500 TM MFP - GNU/Linux subsystemgeneric | >=0 <* | * |
| Siemens/SIPLUS S7-1500 CPU 1518-4 PN/DP MFPgeneric | >=V3.1.0 <V3.1.5 | V3.1.5 |
Published upstream
Feb 12, 2025
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 15, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Oct 15, 2026
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.
Quoted source text, attributed separately from HOL analysis.