Linux: Out-of-bounds Read
CVE-2026-52917 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 6657af827e21883ae90693e42e7f59a6aab690b5, b2be72d401833194917e44fbd8d8144bb4f2db16, 5425de8bd6e9fe5bd67d158e3348171ae7510117 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 0.13% 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 6657af827e21883ae90693e42e7f59a6aab690b5 or b2be72d401833194917e44fbd8d8144bb4f2db16 or 5425de8bd6e9fe5bd67d158e3348171ae7510117 or e97c2a535e23ed0fdd2660993fb3f10d9535c9bc, whichever matches your release line, or a later version.
- Update Linux Kernel to 5.10.259 or 5.15.210 or 6.1.176 or 6.6.143, whichever matches your release line, or a later version.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| Linux | Linux | 8f840e47f190cbe61a96945c13e9551048d42cef up to, but not including, 6657af827e21883ae90693e42e7f59a6aab690b5; 8f840e47f190cbe61a96945c13e9551048d42cef up to, but not including, b2be72d401833194917e44fbd8d8144bb4f2db16; 8f840e47f190cbe61a96945c13e9551048d42cef up to, but not including, 5425de8bd6e9fe5bd67d158e3348171ae7510117; 8f840e47f190cbe61a96945c13e9551048d42cef up to, but not including, e97c2a535e23ed0fdd2660993fb3f10d9535c9bc; 8f840e47f190cbe61a96945c13e9551048d42cef up to, but not including, 480f754580b5686b928977d16a59f20cef83ff01; 8f840e47f190cbe61a96945c13e9551048d42cef up to, but not including, 78c4f964b2f94e405721c093773f6250e1e676b2; 8f840e47f190cbe61a96945c13e9551048d42cef up to, but not including, f5af203dec6e0e7a6090fcc2130e9f3901bfc84d; 8f840e47f190cbe61a96945c13e9551048d42cef up to, but not including, 5eba3e48d78edd7551b992cb7ba687019b3a78da; and 1 more ranges | 6657af827e21883ae90693e42e7f59a6aab690b5, b2be72d401833194917e44fbd8d8144bb4f2db16, 5425de8bd6e9fe5bd67d158e3348171ae7510117, e97c2a535e23ed0fdd2660993fb3f10d9535c9bc, 480f754580b5686b928977d16a59f20cef83ff01, 78c4f964b2f94e405721c093773f6250e1e676b2 |
| Siemens | SIMATIC S7-1500 TM MFP - GNU/Linux subsystem | all versions | Not stated |
| Linux | Linux Kernel | 4.7 up to, but not including, 5.10.259; 5.11 up to, but not including, 5.15.210; 5.16 up to, but not including, 6.1.176; 6.2 up to, but not including, 6.6.143; 6.7 up to, but not including, 6.12.94; 6.13 up to, but not including, 6.18.36; 6.19 up to, but not including, 7.0.13; 7.1 | 5.10.259, 5.15.210, 6.1.176, 6.6.143, 6.12.94, 6.18.36 |
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 CNA.
Official description
In the Linux kernel, the following vulnerability has been resolved: sctp: diag: reject stale associations in dump_one path The SCTP exact sock_diag lookup can hold a transport reference, block on lock_sock(sk), and then resume after sctp_association_free() has marked the association dead and freed its bind address list. When that happens, inet_assoc_attr_size() and inet_diag_msg_sctpasoc_fill() can still dereference association state that is no longer valid for reporting. In particular, inet_diag_msg_sctpasoc_fill() may read an empty bind-address list as a real sctp_sockaddr_entry and trigger an out-of-bounds read from unrelated association memory. Reject the association after taking the socket lock if it has been reaped or detached from the endpoint, and report the lookup as stale. This keeps the exact dump-one path from formatting torn association state.
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/480f754580b5686b928977d16a59f20cef83ff01
- git.kernel.org/stable/c/5425de8bd6e9fe5bd67d158e3348171ae7510117
- git.kernel.org/stable/c/5eba3e48d78edd7551b992cb7ba687019b3a78da
- git.kernel.org/stable/c/6657af827e21883ae90693e42e7f59a6aab690b5
- git.kernel.org/stable/c/78c4f964b2f94e405721c093773f6250e1e676b2
- git.kernel.org/stable/c/b2be72d401833194917e44fbd8d8144bb4f2db16
- git.kernel.org/stable/c/e97c2a535e23ed0fdd2660993fb3f10d9535c9bc
- git.kernel.org/stable/c/f5af203dec6e0e7a6090fcc2130e9f3901bfc84d
Other references
Recent Out-of-bounds Read vulnerabilities
- 8.8 High severity
- 7.8 High severity
- 7.1 High severity
- 7.1 High severity
- 9.1 Critical severity
- 7.1 High severity
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