Linux: Out-of-bounds Read
CVE-2026-53146 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 from the same local network by an unauthenticated attacker, without any action from a user. The record lists versions c55da494dfb445fb28df3a9d293c2be6a299cd01, 7720654b4842bcdfeb64bc002f6186041849e1e7, 033dfa63bf6be2653441a1dccae4a8313a91bb9d 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 0.26% 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 c55da494dfb445fb28df3a9d293c2be6a299cd01 or 7720654b4842bcdfeb64bc002f6186041849e1e7 or 033dfa63bf6be2653441a1dccae4a8313a91bb9d or fc261397295b8ad0654cec747b0ec25ea0011995, 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, c55da494dfb445fb28df3a9d293c2be6a299cd01; cdae7c07e3e3509eaabc18c1640a55dc5b99c179 up to, but not including, 7720654b4842bcdfeb64bc002f6186041849e1e7; cdae7c07e3e3509eaabc18c1640a55dc5b99c179 up to, but not including, 033dfa63bf6be2653441a1dccae4a8313a91bb9d; cdae7c07e3e3509eaabc18c1640a55dc5b99c179 up to, but not including, fc261397295b8ad0654cec747b0ec25ea0011995; cdae7c07e3e3509eaabc18c1640a55dc5b99c179 up to, but not including, a15b6d3136accb2bf84b04d9a3ddd991f7fbf1cb; cdae7c07e3e3509eaabc18c1640a55dc5b99c179 up to, but not including, b5daa920f44cb582272fc9bfaeb67408776cbaef; cdae7c07e3e3509eaabc18c1640a55dc5b99c179 up to, but not including, b2c1e5d9f1598cc1a4736d5c6bd1218f90805ee4; cdae7c07e3e3509eaabc18c1640a55dc5b99c179 up to, but not including, 4db2bd2ed4785dbadaeeab9f4e346b21ac5fb8eb; and 1 more ranges | c55da494dfb445fb28df3a9d293c2be6a299cd01, 7720654b4842bcdfeb64bc002f6186041849e1e7, 033dfa63bf6be2653441a1dccae4a8313a91bb9d, fc261397295b8ad0654cec747b0ec25ea0011995, a15b6d3136accb2bf84b04d9a3ddd991f7fbf1cb, b5daa920f44cb582272fc9bfaeb67408776cbaef |
| 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
- AdjacentThe attacker must be on the same local network segment.
- 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
- HighAll data handled by the component can be read.
- Integrity
- LowLimited modification of data is possible.
- Availability
- NoneAvailability is not affected.
Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N. Scored by CNA.
Official description
In the Linux kernel, the following vulnerability has been resolved: thunderbolt: Limit XDomain response copy to actual frame size tb_xdomain_copy() copies req->response_size bytes from the received packet buffer regardless of the actual frame size. When a short response arrives, this reads past the valid frame data in the DMA pool buffer into stale contents from previous transactions. Use the minimum of frame size and expected response size for the copy length.
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/033dfa63bf6be2653441a1dccae4a8313a91bb9d
- git.kernel.org/stable/c/4db2bd2ed4785dbadaeeab9f4e346b21ac5fb8eb
- git.kernel.org/stable/c/7720654b4842bcdfeb64bc002f6186041849e1e7
- git.kernel.org/stable/c/a15b6d3136accb2bf84b04d9a3ddd991f7fbf1cb
- git.kernel.org/stable/c/b2c1e5d9f1598cc1a4736d5c6bd1218f90805ee4
- git.kernel.org/stable/c/b5daa920f44cb582272fc9bfaeb67408776cbaef
- git.kernel.org/stable/c/c55da494dfb445fb28df3a9d293c2be6a299cd01
- git.kernel.org/stable/c/fc261397295b8ad0654cec747b0ec25ea0011995
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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