9.8

CVE-2024-56645: can: j1939: j1939_session_new(): fix skb reference counting

Modified
AliasesUBUNTU-CVE-2024-56645DEBIAN-CVE-2024-56645
Published 27-12-2024Last modified 05-08-2026

Vulnerability summary

CVE-2024-56645 is a critical (CVSS 9.8) vulnerability in linux. EPSS estimates a 0.68% chance of exploitation in the next 30 days, higher than 52.4% of scored vulnerabilities.

Priority
Prioritisesevere

Severe, CVSS 9.8 (CVE.org); no exploitation reported by the 5 checked sources; EPSS 1% (FIRST, 03-11-2026)

Source freshness unavailable

How is this decided?
CVSS score
9.8/10
010
Critical · v3.1 (CVE.org)
EPSS score
0.68%
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 55 · Related 49
DLA-4075-1DLA-4076-1MGASA-2025-0030MGASA-2025-0032RHSA-2025:20518RHSA-2026:21557

Timeline

  1. 27-12-2024
    PublishedVulnerability first disclosed.
  2. 05-08-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: can: j1939: j1939_session_new(): fix skb reference counting Since j1939_session_skb_queue() does an extra skb_get() for each new skb, do the same for the initial one in j1939_session_new() to avoid refcount underflow. [mkl: clean up commit message]

CVSS metrics

5 scores · 4 sources · 2 versions

EPSS trend

Probability

0.68%

Chance of exploitation in the next 30 days

Percentile

52%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.68% 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: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.

Ubuntu131 products
  • linux< 5.4.0-211.231 | < 5.15.0-135.146 | < 6.8.0-58.60
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-aws< 5.4.0-1142.152 | < 5.15.0-1080.87 | < 6.8.0-1027.29
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Linux2 products
  • linux≥ 9d71dd0c70099914fcd063135da3c580865e924c, < 224e606a8d8e8c7db94036272c47a37455667313 | ≥ 9d71dd0c70099914fcd063135da3c580865e924c, < b3282c2bebeeb82ceec492ee4972f51ee7a4a132 | ≥ 9d71dd0c70099914fcd063135da3c580865e924c, < 4199dd78a59896e091d3a7a05a77451aa7fd724d | ≥ 9d71dd0c70099914fcd063135da3c580865e924c, < f117cba69cbbd496babb3defcdf440df4fd6fe14 | ≥ 9d71dd0c70099914fcd063135da3c580865e924c, < 426d94815e12b6bdb9a75af294fbbafb9301601d | ≥ 9d71dd0c70099914fcd063135da3c580865e924c, < 68fceb143b635cdc59fed3896d5910aff38f345e | ≥ 9d71dd0c70099914fcd063135da3c580865e924c, < a8c695005bfe6569acd73d777ca298ddddd66105 | 5.4
  • linux_kernel≥ 5.4, < 5.4.287 | ≥ 5.5, < 5.10.231 | ≥ 5.11, < 5.15.174 | ≥ 5.16, < 6.1.120 | ≥ 6.2, < 6.6.66 | ≥ 6.7, < 6.12.5 | 6.13:rc1
Debian1 product
  • linux< 6.1.123-1 | < 6.12.5-1

3 vendors · 134 products

References

49 links
Show all 49 references