Linux: Out-of-bounds Read
CVE-2025-38004 is a high-severity out-of-bounds read vulnerability in Linux, with a CVSS 3.1 base score of 7.1 out of 10. It can be exploited with local access to the system by an attacker with a low-privileged account, without any action from a user. The record lists versions 8f1c022541bf5a923c8d6fa483112c15250f30a4, 7595de7bc56e0e52b74e56c90f7e247bf626d628, fbd8fdc2b218e979cfe422b139b8f74c12419d1f as the first without the flaw, so updating Linux to one of those releases or later removes the exposure. There is no confirmed exploitation so far. EPSS estimates a 0.28% chance of exploitation within 30 days, which is low compared with other CVEs.
High severity with no evidence of exploitation so far.
What to do
- Update Linux to 8f1c022541bf5a923c8d6fa483112c15250f30a4 or 7595de7bc56e0e52b74e56c90f7e247bf626d628 or fbd8fdc2b218e979cfe422b139b8f74c12419d1f or 2a437b86ac5a9893c902f30ef66815bf13587bf6, whichever matches your release line, or a later version.
- Update Linux Kernel to 5.4.294 or 5.10.238 or 5.15.185 or 6.1.141, whichever matches your release line, or a later version.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| Linux | Linux | ffd980f976e7fd666c2e61bf8ab35107efd11828 up to, but not including, 8f1c022541bf5a923c8d6fa483112c15250f30a4; ffd980f976e7fd666c2e61bf8ab35107efd11828 up to, but not including, 7595de7bc56e0e52b74e56c90f7e247bf626d628; ffd980f976e7fd666c2e61bf8ab35107efd11828 up to, but not including, fbd8fdc2b218e979cfe422b139b8f74c12419d1f; ffd980f976e7fd666c2e61bf8ab35107efd11828 up to, but not including, 2a437b86ac5a9893c902f30ef66815bf13587bf6; ffd980f976e7fd666c2e61bf8ab35107efd11828 up to, but not including, 76c84c3728178b2d38d5604e399dfe8b0752645e; ffd980f976e7fd666c2e61bf8ab35107efd11828 up to, but not including, cc55dd28c20a6611e30596019b3b2f636819a4c0; ffd980f976e7fd666c2e61bf8ab35107efd11828 up to, but not including, c4e8a172501e677ebd8ea9d9161d97dc4df56fbd; ffd980f976e7fd666c2e61bf8ab35107efd11828 up to, but not including, c2aba69d0c36a496ab4f2e81e9c2b271f2693fd7; and 1 more ranges | 8f1c022541bf5a923c8d6fa483112c15250f30a4, 7595de7bc56e0e52b74e56c90f7e247bf626d628, fbd8fdc2b218e979cfe422b139b8f74c12419d1f, 2a437b86ac5a9893c902f30ef66815bf13587bf6, 76c84c3728178b2d38d5604e399dfe8b0752645e, cc55dd28c20a6611e30596019b3b2f636819a4c0 |
| Linux | Linux Kernel | 2.6.25 up to, but not including, 5.4.294; 5.5 up to, but not including, 5.10.238; 5.11 up to, but not including, 5.15.185; 5.16 up to, but not including, 6.1.141; 6.2 up to, but not including, 6.6.93; 6.7 up to, but not including, 6.12.31; 6.13 up to, but not including, 6.14.9; 6.15 | 5.4.294, 5.10.238, 5.15.185, 6.1.141, 6.6.93, 6.12.31 |
| Debian | Debian Linux | 11.0 | Not stated |
Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.
How the severity score breaks down
- Attack vector
- LocalThe attacker needs local access or must trick a user into running something.
- Attack complexity
- LowNo special conditions are needed; the attack works reliably.
- Privileges required
- LowA basic user account is enough.
- User interaction
- NoneNo action by a victim is required.
- Scope
- UnchangedImpact stays within the vulnerable component.
- Confidentiality
- HighAll data handled by the component can be read.
- Integrity
- NoneNothing can be modified.
- Availability
- HighThe component can be taken down completely.
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H. Scored by NVD.
| Scoring system | Score | Severity | Scored by |
|---|---|---|---|
| CVSS 3.1 | 7.3 | High | CNA |
| CVSS 3.1 | 7.1 | High | NVD |
Official 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.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Out-of-bounds Read
The product reads data past the end, or before the beginning, of the intended buffer.
How developers prevent this class of flaw
- Use a language that provides appropriate memory abstractions.
Timeline
- CVE record published.
- CISA published its SSVC assessment (exploitation: none, automatable: no, technical impact: partial).
- Record last changed materially (score, affected products, status or references).
References
Patches and release notes
- git.kernel.org/stable/c/2a437b86ac5a9893c902f30ef66815bf13587bf6
- git.kernel.org/stable/c/7595de7bc56e0e52b74e56c90f7e247bf626d628
- git.kernel.org/stable/c/76c84c3728178b2d38d5604e399dfe8b0752645e
- git.kernel.org/stable/c/8f1c022541bf5a923c8d6fa483112c15250f30a4
- git.kernel.org/stable/c/c2aba69d0c36a496ab4f2e81e9c2b271f2693fd7
- git.kernel.org/stable/c/c4e8a172501e677ebd8ea9d9161d97dc4df56fbd
- git.kernel.org/stable/c/cc55dd28c20a6611e30596019b3b2f636819a4c0
- git.kernel.org/stable/c/fbd8fdc2b218e979cfe422b139b8f74c12419d1f
Third-party and government advisories
- lists.debian.org/debian-lts-announce/2025/10/msg00007.htmlThird Party Advisory
- lists.debian.org/debian-lts-announce/2025/10/msg00008.htmlThird Party Advisory
Recent Out-of-bounds Read vulnerabilities
- 8.8 High severity
- 7.8 High severity
- 7.8 High severity
- 7.8 High severity
- 7.8 High severity
- 7.8 High severity
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