Linux: Out-of-bounds Read
CVE-2024-26789 is a high-severity out-of-bounds read vulnerability in Linux, with a CVSS 3.1 base score of 7.8 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 034e2d70b5c7f578200ad09955aeb2aa65d1164a, 1291d278b5574819a7266568ce4c28bce9438705, 9e8ecd4908b53941ab6f0f51584ab80c6c6606c4 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 0.24% 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 034e2d70b5c7f578200ad09955aeb2aa65d1164a or 1291d278b5574819a7266568ce4c28bce9438705 or 9e8ecd4908b53941ab6f0f51584ab80c6c6606c4 or 1c0cf6d19690141002889d72622b90fc01562ce4, whichever matches your release line, or a later version.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| Linux | Linux | fc074e130051015e39245a4241956ff122e2f465 up to, but not including, 034e2d70b5c7f578200ad09955aeb2aa65d1164a; fc074e130051015e39245a4241956ff122e2f465 up to, but not including, 1291d278b5574819a7266568ce4c28bce9438705; fc074e130051015e39245a4241956ff122e2f465 up to, but not including, 9e8ecd4908b53941ab6f0f51584ab80c6c6606c4; fc074e130051015e39245a4241956ff122e2f465 up to, but not including, 1c0cf6d19690141002889d72622b90fc01562ce4; 5.18 | 034e2d70b5c7f578200ad09955aeb2aa65d1164a, 1291d278b5574819a7266568ce4c28bce9438705, 9e8ecd4908b53941ab6f0f51584ab80c6c6606c4, 1c0cf6d19690141002889d72622b90fc01562ce4 |
| Linux | Linux Kernel | 5.18 through 6.1.81; 6.2 through 6.6.21; 6.2 through 6.7.9; 6.8 | 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
- HighData or code can be modified at will.
- 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:H/A:H. Scored by CNA.
| Scoring system | Score | Severity | Scored by |
|---|---|---|---|
| CVSS 3.1 | 7.8 | High | CNA |
| CVSS 3.1 | 7.1 | High | CISA (ADP) |
Official description
In the Linux kernel, the following vulnerability has been resolved: crypto: arm64/neonbs - fix out-of-bounds access on short input The bit-sliced implementation of AES-CTR operates on blocks of 128 bytes, and will fall back to the plain NEON version for tail blocks or inputs that are shorter than 128 bytes to begin with. It will call straight into the plain NEON asm helper, which performs all memory accesses in granules of 16 bytes (the size of a NEON register). For this reason, the associated plain NEON glue code will copy inputs shorter than 16 bytes into a temporary buffer, given that this is a rare occurrence and it is not worth the effort to work around this in the asm code. The fallback from the bit-sliced NEON version fails to take this into account, potentially resulting in out-of-bounds accesses. So clone the same workaround, and use a temp buffer for short in/outputs.
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
Recent Out-of-bounds Read vulnerabilities
- 7.1 High severity
- 7.8 High severity
- 7.8 High severity
- 7.8 High severity
- 9.8 Critical severity
- 7.8 High severity
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