CVE-2026-64343: USB: ldusb: fix use-after-free on disconnect race

High 7.8 EPSS 0.1% Linux kernel

In the Linux kernel, the following vulnerability has been resolved: USB: ldusb: fix use-after-free on disconnect race mutex_unlock() may access the mutex structure after releasing the lock and therefore cannot be used to manage lifetime of objects directly (unlike spinlocks and refcounts). [1][2] Use a kref to release the driver data to avoid use-after-free in mutex_unlock() when release() races with disconnect(). [1] a51749ab34d9 ("locking/mutex: Document that mutex_unlock() is non-atomic") [2] 2b9d9e0a9ba0 ("locking/mutex: Clarify that mutex_unlock(), and most other sleeping locks, can still use the lock object after it's unlocked")

CVE-2026-64343CVE identifier
7.8CVSS 3.1 base score (high)
0.1%EPSS: chance of exploitation in the next 30 days (higher than 2% of CVEs)
2026-07-25published

What do these terms mean? CVE · CVSS score · exploited (KEV) · EPSS · backported fix · all terms

What to do now

Check whether you run Linux kernel and which version (commands below).
Install the fixed version for your system: see “Patch it” below.
Reboot into the new kernel (uname -r to confirm); live patching (kpatch, Ubuntu Livepatch, SUSE kGraft/klp) can defer the reboot for some CVEs

Affected and fixed versions

Affected:

Linux Linux ce0d7d3f575fc1ba6a89c3c651e710355590daff to before fc55923a972e715f9a27187b47d4920709e23d85
Linux Linux ce0d7d3f575fc1ba6a89c3c651e710355590daff to before e5a9bdce4bfd3e2226b5f3df5fb8385d6935ee69
Linux Linux ce0d7d3f575fc1ba6a89c3c651e710355590daff to before af59829e67e11ba2511a9f8e4b9111afc7d1f550
Linux Linux ce0d7d3f575fc1ba6a89c3c651e710355590daff to before 02ca08fff74cf9b0a3c4d2cacde1c6edeeb95bb4
Linux Linux ce0d7d3f575fc1ba6a89c3c651e710355590daff to before d8f69404e1d671326f86d378b9f5bfbd56490e9d
Linux Linux ce0d7d3f575fc1ba6a89c3c651e710355590daff to before 2107a4fc8ff1cf1d52f416c1e5cc8e97413a5915
Linux Linux ce0d7d3f575fc1ba6a89c3c651e710355590daff to before a3e794136ab5e3ad1e7019175a4b837aec86db4b
Linux Linux ce0d7d3f575fc1ba6a89c3c651e710355590daff to before 19bdfc7b3c179331eafa423d87e1336f43bbfeb8
Linux Linux 2.6.26

Patch it

Use the commands for your system. Distribution packages often keep an older version number with the fix backported, so compare with the fixed package versions in the table below, not only with the upstream version.

Debian

sudo apt update
sudo apt install --only-upgrade linux-image-amd64

Ubuntu

sudo apt update
sudo apt install --only-upgrade linux-image-generic (or the installed flavour: linux-image-aws, -azure, -gcp, -virtual)

RHEL, AlmaLinux, Rocky, Oracle

sudo dnf upgrade --refresh kernel

Fedora

sudo dnf upgrade --refresh kernel

SUSE / openSUSE

sudo zypper refresh
sudo zypper update kernel-default

Amazon Linux

sudo dnf upgrade --releasever=latest kernel kernel6.12

Arch Linux

sudo pacman -Syu

Alpine

apk update && apk upgrade linux-lts linux-virt

FreeBSD

not Linux

General update steps for every system are on the Linux and Unix & BSD pages; after updating, see which services to restart.

Fix status in Linux distributions

Release	Package	Status	Fixed version / advisory
Debian 12	`linux`	fixed	`6.1.180-1`
Debian 13	`linux`	fixed	`6.12.96-1`
Debian testing	`linux`	fixed	`7.1.4-1`
Debian 12	`linux-6.12`	fixed	`6.12.100-1~deb12u1`
Red Hat Enterprise Linux 9	`kernel`	fix deferred
Red Hat Enterprise Linux 9	`kernel-rt`	fix deferred
Red Hat Enterprise Linux 8	`kernel`	fix deferred
Red Hat Enterprise Linux 8	`kernel-rt`	fix deferred
Red Hat Enterprise Linux 7	`kernel`	fix deferred
Red Hat Enterprise Linux 7	`kernel-rt`	fix deferred
Red Hat Enterprise Linux 6	`kernel`	out of support scope
Red Hat Enterprise Linux 10	`kernel`	fix deferred

From the Debian security tracker, Ubuntu CVE tracker and Red Hat Security Data API, refreshed every few hours.

Sources

Page generated automatically from official sources on 2026-11-03 18:05 UTC. Always confirm with your vendor's advisory.