Linux: Out-of-bounds Read
CVE-2024-26954 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 d70c2e0904ab3715c5673fd45788a464a246d1db, 9e4937cbc150f9d5a9b5576e1922ef0b5ed2eb72, 3b8da67191e938a63d2736dabb4ac5d337e5de57 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 0.7% chance of exploitation within 30 days, higher than 54% of scored CVEs.
High severity with no evidence of exploitation so far.
What to do
- Update Linux to d70c2e0904ab3715c5673fd45788a464a246d1db or 9e4937cbc150f9d5a9b5576e1922ef0b5ed2eb72 or 3b8da67191e938a63d2736dabb4ac5d337e5de57 or 4f97e6a9d62cb1fce82fbf4baff44b83221bc178, whichever matches your release line, or a later version.
- Update Linux Kernel to 6.1.119 or 6.7.12 or 6.8.3, whichever matches your release line, or a later version.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| Linux | Linux | 0626e6641f6b467447c81dd7678a69c66f7746cf up to, but not including, d70c2e0904ab3715c5673fd45788a464a246d1db; 0626e6641f6b467447c81dd7678a69c66f7746cf up to, but not including, 9e4937cbc150f9d5a9b5576e1922ef0b5ed2eb72; 0626e6641f6b467447c81dd7678a69c66f7746cf up to, but not including, 3b8da67191e938a63d2736dabb4ac5d337e5de57; 0626e6641f6b467447c81dd7678a69c66f7746cf up to, but not including, 4f97e6a9d62cb1fce82fbf4baff44b83221bc178; 0626e6641f6b467447c81dd7678a69c66f7746cf up to, but not including, a80a486d72e20bd12c335bcd38b6e6f19356b0aa; 5.15 | d70c2e0904ab3715c5673fd45788a464a246d1db, 9e4937cbc150f9d5a9b5576e1922ef0b5ed2eb72, 3b8da67191e938a63d2736dabb4ac5d337e5de57, 4f97e6a9d62cb1fce82fbf4baff44b83221bc178, a80a486d72e20bd12c335bcd38b6e6f19356b0aa |
| Linux | Linux Kernel | 5.15 up to, but not including, 6.1.119; 6.2 up to, but not including, 6.7.12; 6.8 up to, but not including, 6.8.3 | 6.1.119, 6.7.12, 6.8.3 |
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 | 8.1 | High | CNA |
| CVSS 3.1 | 7.1 | High | NVD |
Official description
In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix slab-out-of-bounds in smb_strndup_from_utf16() If ->NameOffset of smb2_create_req is smaller than Buffer offset of smb2_create_req, slab-out-of-bounds read can happen from smb2_open. This patch set the minimum value of the name offset to the buffer offset to validate name length of smb2_create_req().
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
- git.kernel.org/stable/c/3b8da67191e938a63d2736dabb4ac5d337e5de57Mailing List
- git.kernel.org/stable/c/4f97e6a9d62cb1fce82fbf4baff44b83221bc178Mailing List
- git.kernel.org/stable/c/a80a486d72e20bd12c335bcd38b6e6f19356b0aaMailing List
- git.kernel.org/stable/c/d70c2e0904ab3715c5673fd45788a464a246d1dbMailing List
Other references
Recent Out-of-bounds Read vulnerabilities
- 7.8 High severity
- 7.8 High severity
- 7.1 High severity
- 8.2 High severity
- 7.5 High severity
- 7.5 High severity
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