Linux: Out-of-bounds Read
CVE-2026-53255 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 13ad995071a06570668dd8daab3616c247c72080, 06fcbd79c3c360a50f9be9d370769bbd738d0976, f7093ac233c1e7f51d125534f46067772a113175 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 0.12% 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 13ad995071a06570668dd8daab3616c247c72080 or 06fcbd79c3c360a50f9be9d370769bbd738d0976 or f7093ac233c1e7f51d125534f46067772a113175 or 74c08e4db35a476c3462aeb65846f955be732626, 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 | 2bb36870e8cb29949ef9acec37129cd8e70f1857 up to, but not including, 13ad995071a06570668dd8daab3616c247c72080; 2bb36870e8cb29949ef9acec37129cd8e70f1857 up to, but not including, 06fcbd79c3c360a50f9be9d370769bbd738d0976; 2bb36870e8cb29949ef9acec37129cd8e70f1857 up to, but not including, f7093ac233c1e7f51d125534f46067772a113175; 2bb36870e8cb29949ef9acec37129cd8e70f1857 up to, but not including, 74c08e4db35a476c3462aeb65846f955be732626; 2bb36870e8cb29949ef9acec37129cd8e70f1857 up to, but not including, 18fea1cb0c2599752e908c8217490f73ddd33e00; 2bb36870e8cb29949ef9acec37129cd8e70f1857 up to, but not including, 1a3c8ffbb469859b076445af44bdfa6a711d483e; 2bb36870e8cb29949ef9acec37129cd8e70f1857 up to, but not including, 2a3f3ed9e198ae23c15859ace2f9ca6cfdc35b57; 2bb36870e8cb29949ef9acec37129cd8e70f1857 up to, but not including, de23fb62259aa01d294f77238ae3b835eb674413; and 1 more ranges | 13ad995071a06570668dd8daab3616c247c72080, 06fcbd79c3c360a50f9be9d370769bbd738d0976, f7093ac233c1e7f51d125534f46067772a113175, 74c08e4db35a476c3462aeb65846f955be732626, 18fea1cb0c2599752e908c8217490f73ddd33e00, 1a3c8ffbb469859b076445af44bdfa6a711d483e |
| Siemens | SIMATIC S7-1500 TM MFP - GNU/Linux subsystem | all versions | Not stated |
| Linux | Linux Kernel | 4.9 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: Bluetooth: MGMT: validate advertising TLV before type checks tlv_data_is_valid() reads each advertising data field length from data[i], then inspects data[i + 1] for managed EIR types before checking that the current field still fits inside the supplied buffer. A malformed field whose length byte is the last byte of the buffer can therefore make the parser read one byte past the advertising data. KASAN reported the following when a malformed MGMT_OP_ADD_ADVERTISING request reached that path: BUG: KASAN: vmalloc-out-of-bounds in tlv_data_is_valid() Read of size 1 Call trace: tlv_data_is_valid() add_advertising() hci_mgmt_cmd() hci_sock_sendmsg() Move the existing element-length check before any type-octet inspection so each non-empty element is proven to contain its type byte before the parser looks at data[i + 1].
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/06fcbd79c3c360a50f9be9d370769bbd738d0976
- git.kernel.org/stable/c/13ad995071a06570668dd8daab3616c247c72080
- git.kernel.org/stable/c/18fea1cb0c2599752e908c8217490f73ddd33e00
- git.kernel.org/stable/c/1a3c8ffbb469859b076445af44bdfa6a711d483e
- git.kernel.org/stable/c/2a3f3ed9e198ae23c15859ace2f9ca6cfdc35b57
- git.kernel.org/stable/c/74c08e4db35a476c3462aeb65846f955be732626
- git.kernel.org/stable/c/de23fb62259aa01d294f77238ae3b835eb674413
- git.kernel.org/stable/c/f7093ac233c1e7f51d125534f46067772a113175
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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