Linux: Out-of-bounds Read
CVE-2024-56721 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 82d6b82cf89d950982ac240ba068c3a7e1f23b0a, ccfee14f08b8699132b87bc6d78e0fa75bf094dd, ff6cdc407f4179748f4673c39b0921503199a0ad 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 0.23% 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 82d6b82cf89d950982ac240ba068c3a7e1f23b0a or ccfee14f08b8699132b87bc6d78e0fa75bf094dd or ff6cdc407f4179748f4673c39b0921503199a0ad, whichever matches your release line, or a later version.
- Update Linux Kernel to 6.11.11 or 6.12.2, whichever matches your release line, or a later version.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| Linux | Linux | 29ba89f1895285f06c333546882e0c5ae9a6df23 up to, but not including, 82d6b82cf89d950982ac240ba068c3a7e1f23b0a; 29ba89f1895285f06c333546882e0c5ae9a6df23 up to, but not including, ccfee14f08b8699132b87bc6d78e0fa75bf094dd; 29ba89f1895285f06c333546882e0c5ae9a6df23 up to, but not including, ff6cdc407f4179748f4673c39b0921503199a0ad; 6.10 | 82d6b82cf89d950982ac240ba068c3a7e1f23b0a, ccfee14f08b8699132b87bc6d78e0fa75bf094dd, ff6cdc407f4179748f4673c39b0921503199a0ad |
| Linux | Linux Kernel | 6.10 up to, but not including, 6.11.11; 6.12 up to, but not including, 6.12.2 | 6.11.11, 6.12.2 |
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 | 7.1 | High | NVD |
| CVSS 3.1 | 7.1 | High | CISA (ADP) |
Official description
In the Linux kernel, the following vulnerability has been resolved: x86/CPU/AMD: Terminate the erratum_1386_microcode array The erratum_1386_microcode array requires an empty entry at the end. Otherwise x86_match_cpu_with_stepping() will continue iterate the array after it ended. Add an empty entry to erratum_1386_microcode to its end.
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
- 7.1 High severity
- 7.1 High severity
- 7.1 High severity
- 7.1 High severity
- 7.1 High severity
Linux Kernel Out-of-Bounds Read Exploited
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