8.8

CVE-2025-40253: s390/ctcm: Fix double-kfree

Deferred
AliasesUBUNTU-CVE-2025-40253DEBIAN-CVE-2025-40253
Published 04-12-2025Last modified 15-10-2026

Vulnerability summary

CVE-2025-40253 is a high (CVSS 8.8) vulnerability in linux. EPSS estimates a 0.30% chance of exploitation in the next 30 days, higher than 22.8% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 8.8, adjacent network); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
8.8/10
010
High · v3.1 (CVE.org)
EPSS score
0.30%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 39 · Related 36
DLA-4436-1MGASA-2026-0017MGASA-2026-0018OPENSUSE-SU-2026:20572-1SUSE-SU-2026:0962-1SUSE-SU-2026:1041-1

Timeline

  1. 04-12-2025
    PublishedVulnerability first disclosed.
  2. 15-10-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: s390/ctcm: Fix double-kfree The function 'mpc_rcvd_sweep_req(mpcginfo)' is called conditionally from function 'ctcmpc_unpack_skb'. It frees passed mpcginfo. After that a call to function 'kfree' in function 'ctcmpc_unpack_skb' frees it again. Remove 'kfree' call in function 'mpc_rcvd_sweep_req(mpcginfo)'. Bug detected by the clang static analyzer.

CVSS metrics

5 scores · 4 sources · 2 versions

EPSS trend

Probability

0.30%

Chance of exploitation in the next 30 days

Percentile

23%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.30% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

No weakness data has been published for this record.

Affected systems

Version check

Known conditions: adjacent network, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.

Ubuntu155 products
  • linuxAll versions (No fix recorded) | < 5.15.0-173.183 | < 6.8.0-106.106 | < 6.17.0-19.19
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 5.15.0-1103.110 | < 6.8.0-1050.53 | < 6.17.0-1009.9
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Debian1 product
  • linux< 6.1.159-1 | < 6.12.63-1 | < 6.17.10-1
Linux1 product
  • linux≥ 467ddbbe7e749d558f13e640f50f546149c930b3, < 06f1dd1de0d33dbfbd2e1fc9fc57d8895f730de2 | ≥ 4d3c6d741816539b57fa1110c3f765a8c176d7b4, < 6bf8ccaabce8cebb6cb1f255c93d0acdfe95c17a | ≥ 2bd57101c3ecf3f8c0da1d26c2b6ad511adc6d50, < 7616e2eee679746d526c7f5befd4eedb995935b5 | ≥ 0c0b20587b9f25a2ad14db7f80ebe49bdf29920a, < 43096dab8cc60fc39133205fd149a54d3acebea8 | ≥ 0c0b20587b9f25a2ad14db7f80ebe49bdf29920a, < 3b177b2ded563df16f6d5920671ffcfe5915d472 | ≥ 0c0b20587b9f25a2ad14db7f80ebe49bdf29920a, < b9dbfb1b5699f9f1e4991f96741bdf9047147589 | ≥ 0c0b20587b9f25a2ad14db7f80ebe49bdf29920a, < 7ff76f8dc6b550f8d16487bf3cebc278be720b5c | ≥ 0c0b20587b9f25a2ad14db7f80ebe49bdf29920a, < da02a1824884d6c84c5e5b5ac373b0c9e3288ec2 | 36933de59f67029e5739a98393891f9b94f27e0f | d886b4292a1c5b4facdb2dfdc31f0fecc71df898 | 4c9ba0fed125deba8416b995b0c274b0804c0c24 | ea0053af5dab4d63a9c44563973fb2f3bfd9eb2b | ≥ 5.4.195, < 5.4.302 | ≥ 5.10.117, < 5.10.247 | ≥ 5.15.41, < 5.15.197 | ≥ 4.9.315, < 4.10 | ≥ 4.14.280, < 4.15 | ≥ 4.19.244, < 4.20 | ≥ 5.17.9, < 5.18 | 5.18

3 vendors · 157 products

References

38 links
Show all 38 references