Linux: Use After Free
CVE-2024-50124 is a high-severity use after free 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 876ac72d535fa94f4ac57bba651987c6f990f646, 14bcb721d241e62fdd18f6f434a2ed2ab6e71a9b, d75aad1d3143ca68cda52ff80ac392e1bbd84325 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 0.32% 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 876ac72d535fa94f4ac57bba651987c6f990f646 or 14bcb721d241e62fdd18f6f434a2ed2ab6e71a9b or d75aad1d3143ca68cda52ff80ac392e1bbd84325 or 246b435ad668596aa0e2bbb9d491b6413861211a, whichever matches your release line, or a later version.
- Update Linux Kernel to 6.1.115 or 6.6.59 or 6.11.6, whichever matches your release line, or a later version.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| Linux | Linux | ccf74f2390d60a2f9a75ef496d2564abb478f46a up to, but not including, 876ac72d535fa94f4ac57bba651987c6f990f646; ccf74f2390d60a2f9a75ef496d2564abb478f46a up to, but not including, 14bcb721d241e62fdd18f6f434a2ed2ab6e71a9b; ccf74f2390d60a2f9a75ef496d2564abb478f46a up to, but not including, d75aad1d3143ca68cda52ff80ac392e1bbd84325; ccf74f2390d60a2f9a75ef496d2564abb478f46a up to, but not including, 246b435ad668596aa0e2bbb9d491b6413861211a; 6.0 | 876ac72d535fa94f4ac57bba651987c6f990f646, 14bcb721d241e62fdd18f6f434a2ed2ab6e71a9b, d75aad1d3143ca68cda52ff80ac392e1bbd84325, 246b435ad668596aa0e2bbb9d491b6413861211a |
| Linux | Linux Kernel | 6.0 up to, but not including, 6.1.115; 6.2 up to, but not including, 6.6.59; 6.7 up to, but not including, 6.11.6; 6.12 | 6.1.115, 6.6.59, 6.11.6 |
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 NVD.
| Scoring system | Score | Severity | Scored by |
|---|---|---|---|
| CVSS 3.1 | 8.0 | High | CNA |
| CVSS 3.1 | 7.8 | High | NVD |
| CVSS 3.1 | 7.8 | High | CISA (ADP) |
Official description
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: ISO: Fix UAF on iso_sock_timeout conn->sk maybe have been unlinked/freed while waiting for iso_conn_lock so this checks if the conn->sk is still valid by checking if it part of iso_sk_list.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Use After Free
The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory belongs to the code that operates on the new pointer.
How developers prevent this class of flaw
- Choose a language that provides automatic memory management.
- When freeing pointers, be sure to set them to NULL once they are freed. However, the utilization of multiple or complex data structures may lower the usefulness of this strategy.
Timeline
- CVE record published.
- CISA published its SSVC assessment (exploitation: none, automatable: no, technical impact: total).
- Record last changed materially (score, affected products, status or references).
References
Patches and release notes
Other references
Recent Use After Free vulnerabilities
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- 7.8 High severity
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- 7.8 High severity
- 7.8 High severity
- 7.8 High severity
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