Linux: Out-of-bounds Read
CVE-2024-26980 is a high-severity out-of-bounds read vulnerability in Linux, with a CVSS 3.1 base score of 8.2 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 da21401372607c49972ea87a6edaafb36a17c325, b80ba648714e6d790d69610cf14656be222d0248, 3160d9734453a40db248487f8204830879c207f1 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 0.62% chance of exploitation within 30 days, higher than 50% of scored CVEs.
High severity with no evidence of exploitation so far.
What to do
- Update Linux to da21401372607c49972ea87a6edaafb36a17c325 or b80ba648714e6d790d69610cf14656be222d0248 or 3160d9734453a40db248487f8204830879c207f1 or 0977f89722eceba165700ea384f075143f012085, whichever matches your release line, or a later version.
- Update Linux Kernel to 5.15.159 or 6.1.88 or 6.6.29 or 6.8.8, 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 | 0626e6641f6b467447c81dd7678a69c66f7746cf up to, but not including, da21401372607c49972ea87a6edaafb36a17c325; 0626e6641f6b467447c81dd7678a69c66f7746cf up to, but not including, b80ba648714e6d790d69610cf14656be222d0248; 0626e6641f6b467447c81dd7678a69c66f7746cf up to, but not including, 3160d9734453a40db248487f8204830879c207f1; 0626e6641f6b467447c81dd7678a69c66f7746cf up to, but not including, 0977f89722eceba165700ea384f075143f012085; 0626e6641f6b467447c81dd7678a69c66f7746cf up to, but not including, c119f4ede3fa90a9463f50831761c28f989bfb20; 5.15 | da21401372607c49972ea87a6edaafb36a17c325, b80ba648714e6d790d69610cf14656be222d0248, 3160d9734453a40db248487f8204830879c207f1, 0977f89722eceba165700ea384f075143f012085, c119f4ede3fa90a9463f50831761c28f989bfb20 |
| Linux | Linux Kernel | 5.15 up to, but not including, 5.15.159; 5.16 up to, but not including, 6.1.88; 6.2 up to, but not including, 6.6.29; 6.7 up to, but not including, 6.8.8; 6.9 | 5.15.159, 6.1.88, 6.6.29, 6.8.8 |
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
- LowSome restricted data can be read.
- 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:L/I:N/A:H. Scored by CNA.
| Scoring system | Score | Severity | Scored by |
|---|---|---|---|
| CVSS 3.1 | 8.2 | High | CNA |
| CVSS 3.1 | 5.5 | Medium | CISA (ADP) |
Official description
In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix slab-out-of-bounds in smb2_allocate_rsp_buf If ->ProtocolId is SMB2_TRANSFORM_PROTO_NUM, smb2 request size validation could be skipped. if request size is smaller than sizeof(struct smb2_query_info_req), slab-out-of-bounds read can happen in smb2_allocate_rsp_buf(). This patch allocate response buffer after decrypting transform request. smb3_decrypt_req() will validate transform request size and avoid slab-out-of-bound in smb2_allocate_rsp_buf().
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/0977f89722eceba165700ea384f075143f012085
- git.kernel.org/stable/c/3160d9734453a40db248487f8204830879c207f1
- git.kernel.org/stable/c/b80ba648714e6d790d69610cf14656be222d0248
- git.kernel.org/stable/c/c119f4ede3fa90a9463f50831761c28f989bfb20
- git.kernel.org/stable/c/da21401372607c49972ea87a6edaafb36a17c325
Other references
Recent Out-of-bounds Read vulnerabilities
- 7.8 High severity
- 7.8 High severity
- 7.1 High severity
- 7.1 High severity
- 7.5 High severity
- 7.5 High severity
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