5.5

CVE-2025-21694: linux

CVSS: 5.5v3.1MediumModified
AliasesUBUNTU-CVE-2025-21694DEBIAN-CVE-2025-21694
Published 12-02-2025Last modified 15-10-2026
Open JSON

Vulnerability summary

CVE-2025-21694 is a medium (CVSS 5.5) vulnerability in linux. EPSS estimates a 0.24% chance of exploitation in the next 30 days, higher than 14.4% of scored vulnerabilities.

Overall risk
22/100
0100
Low · default modelHow is this calculated?
CVSS score
5.5/10
010
Medium · v3.1 (CVE.org)
EPSS score
0.24%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 35 · Related 32
DLA-4075-1DLA-4076-1RHSA-2025:6966USN-7387-1USN-7387-2USN-7387-3

Timeline

  1. 12-02-2025
    PublishedVulnerability first disclosed.
  2. 15-10-2026
    Last modifiedVulnerability information updated.

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.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.24%

Chance of exploitation in the next 30 days

Percentile

14%

Versus all other CVEs

30-day change

0.00 pp

From 0.24% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.24%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

No weakness data has been published for this record.

Affected systems

Ubuntu132 products
  • linux< 5.4.0-211.231 | < 5.15.0-135.146 | < 6.8.0-62.65
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-aws< 5.4.0-1142.152 | < 5.15.0-1080.87 | < 6.8.0-1030.32
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Linux2 products
  • linux≥ 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 | 6.10
  • linux_kernel≥ 4.19.317, < 4.20 | ≥ 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 | ≥ 6.9.6, < 6.12.11 | 6.13:rc1 | 6.13:rc2 | 6.13:rc3 | 6.13:rc4 | 6.13:rc5 | 6.13:rc6 | 6.13:rc7
Debian1 product
  • linux< 6.1.128-1 | < 6.12.11-1

3 vendors · 135 products

References

49 links
Show all 49 references