Linux: Improper Locking
CVE-2024-35999 is a high-severity improper locking vulnerability in Linux, with a CVSS 3.1 base score of 7.5 out of 10. It can be exploited remotely over the network by an unauthenticated attacker, without any action from a user. The record lists versions 98c7ed29cd754ae7475dc7cb3f33399fda902729, 0fcf7e219448e937681216353c9a58abae6d3c2e, 60ab245292280905603bc0d3654f4cf8fceccb00 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 0.38% 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 98c7ed29cd754ae7475dc7cb3f33399fda902729 or 0fcf7e219448e937681216353c9a58abae6d3c2e or 60ab245292280905603bc0d3654f4cf8fceccb00 or 8094a600245e9b28eb36a13036f202ad67c1f887, whichever matches your release line, or a later version.
- Update Linux Kernel to 6.1.91 or 6.6.30 or 6.8.9, whichever matches your release line, or a later version.
- Until you can update, restrict network access to the affected service so it is not reachable from untrusted networks.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| Linux | Linux | 724244cdb3828522109c88e56a0242537aefabe9 up to, but not including, 98c7ed29cd754ae7475dc7cb3f33399fda902729; 724244cdb3828522109c88e56a0242537aefabe9 up to, but not including, 0fcf7e219448e937681216353c9a58abae6d3c2e; 724244cdb3828522109c88e56a0242537aefabe9 up to, but not including, 60ab245292280905603bc0d3654f4cf8fceccb00; 724244cdb3828522109c88e56a0242537aefabe9 up to, but not including, 8094a600245e9b28eb36a13036f202ad67c1f887; 3d74c2c917e4006a3bd660d2fc7829cb2ef64113; 5.15.27 up to, but not including, 5.16; 5.16 | 98c7ed29cd754ae7475dc7cb3f33399fda902729, 0fcf7e219448e937681216353c9a58abae6d3c2e, 60ab245292280905603bc0d3654f4cf8fceccb00, 8094a600245e9b28eb36a13036f202ad67c1f887, 5.16 |
| Linux | Linux Kernel | before 6.1.91; 6.2 up to, but not including, 6.6.30; 6.7 up to, but not including, 6.8.9; 6.9 | 6.1.91, 6.6.30, 6.8.9 |
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
- NetworkCan be exploited remotely over a network, including the internet.
- Attack complexity
- LowNo special conditions are needed; the attack works reliably.
- Privileges required
- NoneNo account or login is needed.
- User interaction
- NoneNo action by a victim is required.
- Scope
- UnchangedImpact stays within the vulnerable component.
- Confidentiality
- NoneNo data is disclosed.
- Integrity
- NoneNothing can be modified.
- Availability
- HighThe component can be taken down completely.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H. Scored by CNA.
| Scoring system | Score | Severity | Scored by |
|---|---|---|---|
| CVSS 3.1 | 7.5 | High | CNA |
| CVSS 3.1 | 5.5 | Medium | CISA (ADP) |
Official description
In the Linux kernel, the following vulnerability has been resolved: smb3: missing lock when picking channel Coverity spotted a place where we should have been holding the channel lock when accessing the ses channel index. Addresses-Coverity: 1582039 ("Data race condition (MISSING_LOCK)")
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Improper Locking
The product does not properly acquire or release a lock on a resource, leading to unexpected resource state changes and behaviors.
How developers prevent this class of flaw
- Use industry standard APIs to implement locking mechanism.
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 Improper Locking vulnerabilities
- 7.8 High severity
- 7.8 High severity
- 7.8 High severity
- 7.8 High severity
- 7.8 High severity
- 7.8 High severity
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