Linux: Use After Free
CVE-2024-53239 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 74357d0b5cd3ef544752bc9f21cbeee4902fae6c, 273eec23467dfbfbd0e4c10302579ba441fb1e13, f2d06d4e129e2508e356136f99bb20a332ff1a00 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 0.29% 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 74357d0b5cd3ef544752bc9f21cbeee4902fae6c or 273eec23467dfbfbd0e4c10302579ba441fb1e13 or f2d06d4e129e2508e356136f99bb20a332ff1a00 or b889a7d68d7e76b8795b754a75c91a2d561d5e8c, whichever matches your release line, or a later version.
- Update Linux Kernel to 4.19.325 or 5.4.287 or 5.10.231 or 5.15.174, whichever matches your release line, or a later version.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| Linux | Linux | c6d43ba816d1cf1d125bfbfc938f2a28a87facf9 up to, but not including, 74357d0b5cd3ef544752bc9f21cbeee4902fae6c; c6d43ba816d1cf1d125bfbfc938f2a28a87facf9 up to, but not including, 273eec23467dfbfbd0e4c10302579ba441fb1e13; c6d43ba816d1cf1d125bfbfc938f2a28a87facf9 up to, but not including, f2d06d4e129e2508e356136f99bb20a332ff1a00; c6d43ba816d1cf1d125bfbfc938f2a28a87facf9 up to, but not including, b889a7d68d7e76b8795b754a75c91a2d561d5e8c; c6d43ba816d1cf1d125bfbfc938f2a28a87facf9 up to, but not including, ea8cc56db659cf0ae57073e32a4735ead7bd7ee3; c6d43ba816d1cf1d125bfbfc938f2a28a87facf9 up to, but not including, b754e831a94f82f2593af806741392903f359168; c6d43ba816d1cf1d125bfbfc938f2a28a87facf9 up to, but not including, 0df7f4b5cc10f5adf98be0845372e9eef7bb5b09; c6d43ba816d1cf1d125bfbfc938f2a28a87facf9 up to, but not including, 57860a80f03f9dc69a34a5c37b0941ad032a0a8c; and 2 more ranges | 74357d0b5cd3ef544752bc9f21cbeee4902fae6c, 273eec23467dfbfbd0e4c10302579ba441fb1e13, f2d06d4e129e2508e356136f99bb20a332ff1a00, b889a7d68d7e76b8795b754a75c91a2d561d5e8c, ea8cc56db659cf0ae57073e32a4735ead7bd7ee3, b754e831a94f82f2593af806741392903f359168 |
| Linux | Linux Kernel | 2.6.39 up to, but not including, 4.19.325; 4.20 up to, but not including, 5.4.287; 5.5 up to, but not including, 5.10.231; 5.11 up to, but not including, 5.15.174; 5.16 up to, but not including, 6.1.120; 6.2 up to, but not including, 6.6.64; 6.7 up to, but not including, 6.11.11; 6.12 up to, but not including, 6.12.2 | 4.19.325, 5.4.287, 5.10.231, 5.15.174, 6.1.120, 6.6.64 |
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 | 7.8 | High | NVD |
| CVSS 3.1 | 7.8 | High | CISA (ADP) |
Official description
In the Linux kernel, the following vulnerability has been resolved: ALSA: 6fire: Release resources at card release The current 6fire code tries to release the resources right after the call of usb6fire_chip_abort(). But at this moment, the card object might be still in use (as we're calling snd_card_free_when_closed()). For avoid potential UAFs, move the release of resources to the card's private_free instead of the manual call of usb6fire_chip_destroy() at the USB disconnect callback.
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
- git.kernel.org/stable/c/0df7f4b5cc10f5adf98be0845372e9eef7bb5b09
- git.kernel.org/stable/c/273eec23467dfbfbd0e4c10302579ba441fb1e13
- git.kernel.org/stable/c/57860a80f03f9dc69a34a5c37b0941ad032a0a8c
- git.kernel.org/stable/c/74357d0b5cd3ef544752bc9f21cbeee4902fae6c
- git.kernel.org/stable/c/a0810c3d6dd2d29a9b92604d682eacd2902ce947
- git.kernel.org/stable/c/b754e831a94f82f2593af806741392903f359168
- git.kernel.org/stable/c/b889a7d68d7e76b8795b754a75c91a2d561d5e8c
- git.kernel.org/stable/c/ea8cc56db659cf0ae57073e32a4735ead7bd7ee3
- git.kernel.org/stable/c/f2d06d4e129e2508e356136f99bb20a332ff1a00
Other references
Recent Use After Free vulnerabilities
- 7.8 High severity
- 7.0 High severity
- 7.8 High severity
- 7.8 High severity
- 7.8 High severity
- 7.8 High severity
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