CyberSecBulletin
CVE-2026-53147NVD status: Modified

Linux: Out-of-bounds Read

Published Updated By the CyberSecBulletin desk

CVE-2026-53147 is a high-severity out-of-bounds read vulnerability in Linux, with a CVSS 3.1 base score of 8.1 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 a770e62923090d7572f1f5a8507ae551d354a057, 0dd61ba03d05187726ecdf9c0e2175a81b9b24f6, 79235c8add5da4bf27a12f5a5dbb579f300c059e 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 0.27% chance of exploitation within 30 days, which is low compared with other CVEs.

Next patch cycle

High severity with no evidence of exploitation so far.

What to do

  1. Update Linux to a770e62923090d7572f1f5a8507ae551d354a057 or 0dd61ba03d05187726ecdf9c0e2175a81b9b24f6 or 79235c8add5da4bf27a12f5a5dbb579f300c059e or 46da5c3ea011e884028a91cf913db093920a915b, whichever matches your release line, or a later version.
  2. Update Linux Kernel to 6.1.176 or 6.6.143 or 6.12.94 or 6.18.36, whichever matches your release line, or a later version.

Affected products and versions

VendorProductAffected versionsFixed in
LinuxLinuxcdae7c07e3e3509eaabc18c1640a55dc5b99c179 up to, but not including, a770e62923090d7572f1f5a8507ae551d354a057; cdae7c07e3e3509eaabc18c1640a55dc5b99c179 up to, but not including, 0dd61ba03d05187726ecdf9c0e2175a81b9b24f6; cdae7c07e3e3509eaabc18c1640a55dc5b99c179 up to, but not including, 79235c8add5da4bf27a12f5a5dbb579f300c059e; cdae7c07e3e3509eaabc18c1640a55dc5b99c179 up to, but not including, 46da5c3ea011e884028a91cf913db093920a915b; cdae7c07e3e3509eaabc18c1640a55dc5b99c179 up to, but not including, 07cd2787cdf8942d24a1a3ef81aa89b526fb6381; cdae7c07e3e3509eaabc18c1640a55dc5b99c179 up to, but not including, a504b9f2797b739e0304d537e8aa4ce883ecce39; 4.15a770e62923090d7572f1f5a8507ae551d354a057, 0dd61ba03d05187726ecdf9c0e2175a81b9b24f6, 79235c8add5da4bf27a12f5a5dbb579f300c059e, 46da5c3ea011e884028a91cf913db093920a915b, 07cd2787cdf8942d24a1a3ef81aa89b526fb6381, a504b9f2797b739e0304d537e8aa4ce883ecce39
SiemensSIMATIC S7-1500 TM MFP - GNU/Linux subsystemall versionsNot stated
LinuxLinux Kernel4.15 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; 7.16.1.176, 6.6.143, 6.12.94, 6.18.36, 7.0.13

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
NoneNothing can be modified.
Availability
HighThe component can be taken down completely.

Vector: CVSS:3.1/AV:A/AC:L/PR:N/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: thunderbolt: Validate XDomain request packet size before type cast tb_xdp_handle_request() casts the received packet buffer to protocol-specific structs without verifying that the allocation is large enough for the target type. A peer can send a minimal XDomain packet that passes the generic header length check but is shorter than the struct accessed after the cast, causing out-of- bounds reads from the kmemdup allocation. Plumb the packet length through xdomain_request_work and validate it against the expected struct size before each cast.

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.

More Out-of-bounds Read vulnerabilities (CWE-125)

Timeline

  1. CVE record published.
  2. CISA published its SSVC assessment (exploitation: none, automatable: no, technical impact: partial).
  3. Record last changed materially (score, affected products, status or references).

References

Recent Out-of-bounds Read vulnerabilities

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