CyberSecBulletin
CVE-2026-64487NVD status: Analyzed

Linux: Out-of-bounds Read

Published Updated By the CyberSecBulletin desk

CVE-2026-64487 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 de5f9edc705497b1b2c6b173b22f283486d2fd91, 70d6d4cfa4ad09688aed2ec8a0cfa72c31f60334, 884f575cc6acb136eb4a161d925147f85b59c27e 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.

Next patch cycle

High severity with no evidence of exploitation so far.

What to do

  1. Update Linux to de5f9edc705497b1b2c6b173b22f283486d2fd91 or 70d6d4cfa4ad09688aed2ec8a0cfa72c31f60334 or 884f575cc6acb136eb4a161d925147f85b59c27e or 05df59b9a61f7ca66548df079d306c41da23845d, whichever matches your release line, or a later version.
  2. Update Linux Kernel to 5.10.261 or 5.15.212 or 6.1.178 or 6.6.145, whichever matches your release line, or a later version.

Affected products and versions

VendorProductAffected versionsFixed in
LinuxLinux15c5ab607045e278ebf4d2ca4aea2250617d50ca up to, but not including, de5f9edc705497b1b2c6b173b22f283486d2fd91; 15c5ab607045e278ebf4d2ca4aea2250617d50ca up to, but not including, 70d6d4cfa4ad09688aed2ec8a0cfa72c31f60334; 15c5ab607045e278ebf4d2ca4aea2250617d50ca up to, but not including, 884f575cc6acb136eb4a161d925147f85b59c27e; 15c5ab607045e278ebf4d2ca4aea2250617d50ca up to, but not including, 05df59b9a61f7ca66548df079d306c41da23845d; 15c5ab607045e278ebf4d2ca4aea2250617d50ca up to, but not including, 3cad86197c7bf8b45bb1d8adc1099d0913e80469; 15c5ab607045e278ebf4d2ca4aea2250617d50ca up to, but not including, a5fd3122283bf75c04f6414bf610100beb0565b0; 15c5ab607045e278ebf4d2ca4aea2250617d50ca up to, but not including, 0680413f2f10aab43878dd3db711a6a9e45bab7c; 15c5ab607045e278ebf4d2ca4aea2250617d50ca up to, but not including, f7f3f9fd81e7adbaa12c2e62ee07f0e094a543fd; and 1 more rangesde5f9edc705497b1b2c6b173b22f283486d2fd91, 70d6d4cfa4ad09688aed2ec8a0cfa72c31f60334, 884f575cc6acb136eb4a161d925147f85b59c27e, 05df59b9a61f7ca66548df079d306c41da23845d, 3cad86197c7bf8b45bb1d8adc1099d0913e80469, a5fd3122283bf75c04f6414bf610100beb0565b0
LinuxLinux Kernel2.6.37 up to, but not including, 5.10.261; 5.11 up to, but not including, 5.15.212; 5.16 up to, but not including, 6.1.178; 6.2 up to, but not including, 6.6.145; 6.7 up to, but not including, 6.12.96; 6.13 up to, but not including, 6.18.39; 6.19 up to, but not including, 7.1.45.10.261, 5.15.212, 6.1.178, 6.6.145, 6.12.96, 6.18.39

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: ALSA: caiaq: fix out-of-bounds read in the Traktor Kontrol S4 input parser snd_usb_caiaq_tks4_dispatch() decodes the Traktor Kontrol S4 input stream in fixed 16-byte (TKS4_MSGBLOCK_SIZE) message blocks. On every iteration it advances buf and subtracts the block size while looping on "while (len)". len is urb->actual_length. That value is supplied by the device and is not guaranteed to be a multiple of 16. When a final short block leaves len between 1 and 15, the loop runs once more, reads up to buf[15], and then does "len -= TKS4_MSGBLOCK_SIZE". As len is unsigned this underflows to a huge value. The loop then keeps iterating and walking buf far past the end of the 512-byte ep4_in_buf, reading out of bounds until a bogus block id happens to be hit. Iterate only while a full message block is available. This stops the unsigned underflow and silently drops any trailing partial block, which carries no complete control value anyway. The sibling endpoint-4 parsers are not affected. The Traktor Kontrol X1 and Maschine arms in snd_usb_caiaq_ep4_reply_dispatch() floor urb->actual_length before dispatching.

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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