Linux: Out-of-bounds Read
CVE-2026-53149 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 5c7657d38d07268124782f03519f07c22a5814fb, b212bc161d8a9937b42153723a4a3f2f74fab528, 1912be23daf4afc8d24ce916021ab68ca4c679db 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 5c7657d38d07268124782f03519f07c22a5814fb or b212bc161d8a9937b42153723a4a3f2f74fab528 or 1912be23daf4afc8d24ce916021ab68ca4c679db or 4d0b1524caadb04c10a71f3f88692c63dcb39115, 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 | cdae7c07e3e3509eaabc18c1640a55dc5b99c179 up to, but not including, 5c7657d38d07268124782f03519f07c22a5814fb; cdae7c07e3e3509eaabc18c1640a55dc5b99c179 up to, but not including, b212bc161d8a9937b42153723a4a3f2f74fab528; cdae7c07e3e3509eaabc18c1640a55dc5b99c179 up to, but not including, 1912be23daf4afc8d24ce916021ab68ca4c679db; cdae7c07e3e3509eaabc18c1640a55dc5b99c179 up to, but not including, 4d0b1524caadb04c10a71f3f88692c63dcb39115; cdae7c07e3e3509eaabc18c1640a55dc5b99c179 up to, but not including, 0a32040a48db8cf35de48b85d6115df5623e4964; cdae7c07e3e3509eaabc18c1640a55dc5b99c179 up to, but not including, 60ba6217460792356a238299edd675d91d46bab4; cdae7c07e3e3509eaabc18c1640a55dc5b99c179 up to, but not including, cbeb68cbaa0a6f979ef428a7f2d0268c082ba166; cdae7c07e3e3509eaabc18c1640a55dc5b99c179 up to, but not including, 65423079c7420e3dbf9a7aa345c243a3f5752e5d; and 1 more ranges | 5c7657d38d07268124782f03519f07c22a5814fb, b212bc161d8a9937b42153723a4a3f2f74fab528, 1912be23daf4afc8d24ce916021ab68ca4c679db, 4d0b1524caadb04c10a71f3f88692c63dcb39115, 0a32040a48db8cf35de48b85d6115df5623e4964, 60ba6217460792356a238299edd675d91d46bab4 |
| Siemens | SIMATIC S7-1500 TM MFP - GNU/Linux subsystem | all versions | Not stated |
| Linux | Linux Kernel | 4.15 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 NVD.
Official description
In the Linux kernel, the following vulnerability has been resolved: thunderbolt: Bound root directory content to block size __tb_property_parse_dir() does not check that content_offset + content_len fits within block_len for the root directory case. When rootdir->length equals or exceeds block_len - 2, the entry loop reads past the allocated property block. Add a bounds check after computing content_offset and content_len to reject directories whose content extends past the block.
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/0a32040a48db8cf35de48b85d6115df5623e4964
- git.kernel.org/stable/c/1912be23daf4afc8d24ce916021ab68ca4c679db
- git.kernel.org/stable/c/4d0b1524caadb04c10a71f3f88692c63dcb39115
- git.kernel.org/stable/c/5c7657d38d07268124782f03519f07c22a5814fb
- git.kernel.org/stable/c/60ba6217460792356a238299edd675d91d46bab4
- git.kernel.org/stable/c/65423079c7420e3dbf9a7aa345c243a3f5752e5d
- git.kernel.org/stable/c/b212bc161d8a9937b42153723a4a3f2f74fab528
- git.kernel.org/stable/c/cbeb68cbaa0a6f979ef428a7f2d0268c082ba166
Other references
Recent Out-of-bounds Read vulnerabilities
- 7.5 High severity
- 7.1 High severity
- 8.4 High severity
- 9.1 Critical severity
- 8.2 High severity
- 7.1 High severity
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