7.3

CVE-2025-38004: can: bcm: add locking for bcm_op runtime updates

Modified
AliasesUBUNTU-CVE-2025-38004DEBIAN-CVE-2025-38004
Published 08-06-2025Last modified 15-10-2026

Vulnerability summary

CVE-2025-38004 is a high (CVSS 7.3) Out-of-bounds Read vulnerability in debian debian_linux. EPSS estimates a 0.27% chance of exploitation in the next 30 days, higher than 18.4% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 7.3, local access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
7.3/10
010
High · v3.1 (CVE.org)
EPSS score
0.27%
0%100%
Low · +0.01 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 48 · Related 43
DLA-4327-1DLA-4328-1DSA-5973-1RHSA-2026:64775RHSA-2026:64808SUSE-SU-2025:02249-1

Timeline

  1. 08-06-2025
    PublishedVulnerability first disclosed.
  2. 15-10-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: can: bcm: add locking for bcm_op runtime updates The CAN broadcast manager (CAN BCM) can send a sequence of CAN frames via hrtimer. The content and also the length of the sequence can be changed resp reduced at runtime where the 'currframe' counter is then set to zero. Although this appeared to be a safe operation the updates of 'currframe' can be triggered from user space and hrtimer context in bcm_can_tx(). Anderson Nascimento created a proof of concept that triggered a KASAN slab-out-of-bounds read access which can be prevented with a spin_lock_bh. At the rework of bcm_can_tx() the 'count' variable has been moved into the protected section as this variable can be modified from both contexts too.

CVSS metrics

5 scores · 4 sources · 2 versions

EPSS trend

Probability

0.27%

Chance of exploitation in the next 30 days

Percentile

18%

Versus all other CVEs

30-day change

Increase +0.01 pp

From 0.26% 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

Affected systems

Version check

Known conditions: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.

Ubuntu145 products
  • linuxAll versions (No fix recorded) | < 5.15.0-152.162 | < 6.8.0-100.100
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 5.15.0-1090.97 | < 6.8.0-1046.49
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Debian2 products
Linux2 products
  • linux≥ ffd980f976e7fd666c2e61bf8ab35107efd11828, < 8f1c022541bf5a923c8d6fa483112c15250f30a4 | ≥ ffd980f976e7fd666c2e61bf8ab35107efd11828, < 7595de7bc56e0e52b74e56c90f7e247bf626d628 | ≥ ffd980f976e7fd666c2e61bf8ab35107efd11828, < fbd8fdc2b218e979cfe422b139b8f74c12419d1f | ≥ ffd980f976e7fd666c2e61bf8ab35107efd11828, < 2a437b86ac5a9893c902f30ef66815bf13587bf6 | ≥ ffd980f976e7fd666c2e61bf8ab35107efd11828, < 76c84c3728178b2d38d5604e399dfe8b0752645e | ≥ ffd980f976e7fd666c2e61bf8ab35107efd11828, < cc55dd28c20a6611e30596019b3b2f636819a4c0 | ≥ ffd980f976e7fd666c2e61bf8ab35107efd11828, < c4e8a172501e677ebd8ea9d9161d97dc4df56fbd | ≥ ffd980f976e7fd666c2e61bf8ab35107efd11828, < c2aba69d0c36a496ab4f2e81e9c2b271f2693fd7 | 2.6.25
  • linux_kernel≥ 2.6.25, < 5.4.294 | ≥ 5.5, < 5.10.238 | ≥ 5.11, < 5.15.185 | ≥ 5.16, < 6.1.141 | ≥ 6.2, < 6.6.93 | ≥ 6.7, < 6.12.31 | ≥ 6.13, < 6.14.9 | 6.15:rc1 | 6.15:rc2 | 6.15:rc3 | 6.15:rc4 | 6.15:rc5 | 6.15:rc6 | 6.15:rc7

3 vendors · 149 products

References

46 links
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