kernel: Use After Free
CVE-2024-0775 is a high-severity use after free vulnerability in kernel from 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 4.14.315, 4.19.283, 5.4.243 as the first without the flaw, so updating kernel to one of those releases or later removes the exposure. There is no confirmed exploitation so far. EPSS estimates a 0.22% 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 kernel to 4.14.315 or 4.19.283 or 5.4.243 or 5.10.180, whichever matches your release line, or a later version.
- Update Linux Kernel to 6.4 or a later version.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| Linux | kernel | before 4.14.315; 4.15 up to, but not including, 4.19.283; 4.20 up to, but not including, 5.4.243; 5.5 up to, but not including, 5.10.180; 5.11 up to, but not including, 5.15.112; 5.16 up to, but not including, 6.1.29; 6.2 up to, but not including, 6.2.16; 6.3 up to, but not including, 6.3.3 | 4.14.315, 4.19.283, 5.4.243, 5.10.180, 5.15.112, 6.1.29 |
| Red Hat | Red Hat Enterprise Linux 6 | Not specified in the record | Not stated |
| Red Hat | Red Hat Enterprise Linux 7 | Not specified in the record | Not stated |
| Red Hat | Red Hat Enterprise Linux 8 | Not specified in the record | Not stated |
| Red Hat | Red Hat Enterprise Linux 9 | Not specified in the record | Not stated |
| Linux | Linux Kernel | before 6.4; 6.4 | 6.4 |
| Red Hat | Enterprise Linux | 9.0 | 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
- 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 | 6.7 | Medium | CNA (redhat.com) |
| CVSS 3.1 | 7.1 | High | NVD |
Official description
A use-after-free flaw was found in the __ext4_remount in fs/ext4/super.c in ext4 in the Linux kernel. This flaw allows a local user to cause an information leak problem while freeing the old quota file names before a potential failure, leading to a use-after-free.
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
Third-party and government advisories
- access.redhat.com/security/cve/CVE-2024-0775Third Party Advisory
- bugzilla.redhat.com/show_bug.cgi?id=2259414Issue Tracking, Third Party Advisory
Other vulnerabilities in kernel
- 7.1 High severity
- 7.8 High severity
Linux Kernel Use-After-Free Exploited
- 7.8 High severity
- 7.4 High severity
- 7.0 High severity
- 7.8 High severity
Recent Use After Free vulnerabilities
- 7.8 High severity
- 7.8 High severity
- 7.0 High severity
- 7.0 High severity
- 7.0 High severity
- 7.8 High severity
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