PT-2026-61386 · Linux · Linux

CVE-2026-64069 · Published 2026-07-19 · Updated 2026-07-19

Mitre

CVSS v3.1

9.8

Critical

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

In the Linux kernel, the following vulnerability has been resolved:

netfs: Fix cancellation of a DIO and single read subrequests

When the preparation of a new subrequest for a read fails, if the subrequest has already been added to the stream->subrequests list, it can't simply be put and abandoned as the collector may see it. Also, if it hasn't been queued yet, it has two outstanding refs that both need to be put. Both DIO read and single-read dispatch fail at this; further, both differ in the order they do things to the way buffered read works.

Fix cancellation of both DIO-read and single-read subrequests that failed preparation by the following steps:

(1) Harmonise all three reads (buffered, dio, single) to queue the subreq before prepping it.

(2) Make all three call netfs queue read() to do the queuing.

(3) Set NETFS RREQ ALL QUEUED independently of the queuing as we don't know the length of the subreq at this point.

(4) In all cases, set the error and NETFS SREQ FAILED flag on the subreq and then call netfs read subreq terminated() to deal with it. This will pass responsibility off to the collector for dealing with it.

Fix

Related Identifiers

CVE-2026-64069

Affected Products

Linux

References · 4

• https://nvd.nist.gov/vuln/detail/CVE-2026-64069 · Security Note
• https://git.kernel.org/stable/c/6f0f7ac1915abc0d202f0eb4b003a6548a5ba60d · Note
• https://git.kernel.org/stable/c/f73372a4c6900d117f8e903fe10b62692f95e6c4 · Note
• https://git.kernel.org/stable/c/5366199be46fb53de62861721d34ba816e7e440e · Note