CyberSecBulletin
CVE-2025-21794NVD status: Modified

Linux: Out-of-bounds Read

Published Updated By the CyberSecBulletin desk

CVE-2025-21794 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 436f48c864186e9413d1b7c6e91767cc9e1a65b8, f3ce05283f6cb6e19c220f5382def43dc5bd56b9, cdd9a1ea23ff1a272547217100663e8de4eada40 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 0.23% 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 436f48c864186e9413d1b7c6e91767cc9e1a65b8 or f3ce05283f6cb6e19c220f5382def43dc5bd56b9 or cdd9a1ea23ff1a272547217100663e8de4eada40 or 73e36a699b9f46322ffb81f072a24e64f728dba7, whichever matches your release line, or a later version.
  2. Update Linux Kernel to 6.6.79 or 6.12.16 or 6.13.4, whichever matches your release line, or a later version.

Affected products and versions

VendorProductAffected versionsFixed in
LinuxLinux220883fba32549a34f0734e4859d07f4dcd56992 up to, but not including, 436f48c864186e9413d1b7c6e91767cc9e1a65b8; ae730deded66150204c494282969bfa98dc3ae67 up to, but not including, f3ce05283f6cb6e19c220f5382def43dc5bd56b9; e5bcae4212a6a4b4204f46a1b8bcba08909d2007 up to, but not including, cdd9a1ea23ff1a272547217100663e8de4eada40; 816e84602900f7f951458d743fa12769635ebfd5 up to, but not including, 73e36a699b9f46322ffb81f072a24e64f728dba7; 50420d7c79c37a3efe4010ff9b1bb14bc61ebccf up to, but not including, 0b43d98ff29be3144e86294486b1373b5df74c0e; 6.6.76 up to, but not including, 6.6.79; 6.12.13 up to, but not including, 6.12.16; 6.13.2 up to, but not including, 6.13.4436f48c864186e9413d1b7c6e91767cc9e1a65b8, f3ce05283f6cb6e19c220f5382def43dc5bd56b9, cdd9a1ea23ff1a272547217100663e8de4eada40, 73e36a699b9f46322ffb81f072a24e64f728dba7, 0b43d98ff29be3144e86294486b1373b5df74c0e, 6.6.79
LinuxLinux Kernel6.6.76 up to, but not including, 6.6.79; 6.12.13 up to, but not including, 6.12.16; 6.13.2 up to, but not including, 6.13.4; 6.146.6.79, 6.12.16, 6.13.4

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.

Scoring systemScoreSeverityScored by
CVSS 3.17.1HighNVD
CVSS 3.17.1HighCISA (ADP)

Official description

In the Linux kernel, the following vulnerability has been resolved: HID: hid-thrustmaster: fix stack-out-of-bounds read in usb_check_int_endpoints() Syzbot[1] has detected a stack-out-of-bounds read of the ep_addr array from hid-thrustmaster driver. This array is passed to usb_check_int_endpoints function from usb.c core driver, which executes a for loop that iterates over the elements of the passed array. Not finding a null element at the end of the array, it tries to read the next, non-existent element, crashing the kernel. To fix this, a 0 element was added at the end of the array to break the for loop. [1] https://syzkaller.appspot.com/bug?extid=9c9179ac46169c56c1ad

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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