Linux: Out-of-bounds Read
CVE-2025-39761 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 eb1e1526b82b8cf31f1ef9ca86a2647fb6cd89c6, 7c3e99fd4a66a5ac9c7dd32db07359666efe0002, a3b73c72c42348bf1555fd2b00f32f941324b242 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 0.25% 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 eb1e1526b82b8cf31f1ef9ca86a2647fb6cd89c6 or 7c3e99fd4a66a5ac9c7dd32db07359666efe0002 or a3b73c72c42348bf1555fd2b00f32f941324b242 or 9530d666f4376c294cdf4348c29fe3542fec980a, whichever matches your release line, or a later version.
- Update Linux Kernel to 6.6.103 or 6.12.43 or 6.15.11 or 6.16.2, whichever matches your release line, or a later version.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| Linux | Linux | d889913205cf7ebda905b1e62c5867ed4e39f6c2 up to, but not including, eb1e1526b82b8cf31f1ef9ca86a2647fb6cd89c6; d889913205cf7ebda905b1e62c5867ed4e39f6c2 up to, but not including, 7c3e99fd4a66a5ac9c7dd32db07359666efe0002; d889913205cf7ebda905b1e62c5867ed4e39f6c2 up to, but not including, a3b73c72c42348bf1555fd2b00f32f941324b242; d889913205cf7ebda905b1e62c5867ed4e39f6c2 up to, but not including, 9530d666f4376c294cdf4348c29fe3542fec980a; d889913205cf7ebda905b1e62c5867ed4e39f6c2 up to, but not including, 7c0884fcd2ddde0544d2e77f297ae461e1f53f58; 6.3 | eb1e1526b82b8cf31f1ef9ca86a2647fb6cd89c6, 7c3e99fd4a66a5ac9c7dd32db07359666efe0002, a3b73c72c42348bf1555fd2b00f32f941324b242, 9530d666f4376c294cdf4348c29fe3542fec980a, 7c0884fcd2ddde0544d2e77f297ae461e1f53f58 |
| Linux | Linux Kernel | 6.3 up to, but not including, 6.6.103; 6.7 up to, but not including, 6.12.43; 6.13 up to, but not including, 6.15.11; 6.16 up to, but not including, 6.16.2 | 6.6.103, 6.12.43, 6.15.11, 6.16.2 |
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 | 8.8 | High | CNA |
| CVSS 3.1 | 7.1 | High | NVD |
Official description
In the Linux kernel, the following vulnerability has been resolved: wifi: ath12k: Decrement TID on RX peer frag setup error handling Currently, TID is not decremented before peer cleanup, during error handling path of ath12k_dp_rx_peer_frag_setup(). This could lead to out-of-bounds access in peer->rx_tid[]. Hence, add a decrement operation for TID, before peer cleanup to ensures proper cleanup and prevents out-of-bounds access issues when the RX peer frag setup fails. Found during code review. Compile tested only.
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.
- Record last changed materially (score, affected products, status or references).
References
Patches and release notes
- git.kernel.org/stable/c/7c0884fcd2ddde0544d2e77f297ae461e1f53f58
- git.kernel.org/stable/c/7c3e99fd4a66a5ac9c7dd32db07359666efe0002
- git.kernel.org/stable/c/9530d666f4376c294cdf4348c29fe3542fec980a
- git.kernel.org/stable/c/a3b73c72c42348bf1555fd2b00f32f941324b242
- git.kernel.org/stable/c/eb1e1526b82b8cf31f1ef9ca86a2647fb6cd89c6
Recent Out-of-bounds Read vulnerabilities
- 7.1 High severity
- 7.1 High severity
- 7.1 High severity
- 7.1 High severity
- 7.1 High severity
- 9.1 Critical severity
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