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CVE-2026-90334

tty: clear cdev pointer after cdev_add() failure

N/A
Published: September 17, 2026 at 04:08 PM UTC
Updated: October 19, 2026 at 09:19 AM UTC
1 product affected across 1 vendorLinux Kernel

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Severity
N/A
Exploit prediction
EPSS 0.2%

Description

In the Linux kernel, the following vulnerability has been resolved: tty: clear cdev pointer after cdev_add() failure tty_cdev_add() drops the cdev reference when cdev_add() fails, but leaves driver->cdevs[index] pointing to freed memory. tty_unregister_device() later passes that stale pointer to cdev_del(), causing a use-after-free. Clear the slot after dropping the reference.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Linux Kernel· Linux
90%
4.3c1a752ba2d6b8a52879c7ab637cff38359ea9827
Vendor states this is fixed in 33a44333a9dfda044b0e233399b12ead7f8a90ae (fixed)
Vendor states this is fixed in 4f6bd79bb7e55095f09bec9b4eb6c09df1306116 (fixed)
Vendor states this is fixed in 5c5a795bf6248fe96f96dd9fd79d66bbb4a92077 (fixed)
Vendor states this is fixed in 6645856f0df3aeecd45519cb611415b4b89c2223 (fixed)
Vendor states this is fixed in a83fcddf3c75d004f12aa13555bb73da19fb75a9 (fixed)
Vendor states this is fixed in d331c63570af61ef7aaf516b64a8d6f47518a3a4 (fixed)
Vendor states this is fixed in e9e64dd02fd68776afda00777591eca0c3984285 (fixed)
Vendor states this is fixed in fb1de260033c215dba438973d82b48562bdc86bb (fixed)
Vendor states this is fixed in 4.3 (unaffected)
Vendor states this is fixed in 5.10.270 (unaffected)
Vendor states this is fixed in 5.15.221 (unaffected)
Vendor states this is fixed in 6.1.188 (unaffected)
Vendor states this is fixed in 6.12.110 (unaffected)
Vendor states this is fixed in 6.18.52 (unaffected)
Vendor states this is fixed in 6.6.157 (unaffected)
Vendor states this is fixed in 7.2.6 (unaffected)
Vendor states this is fixed in 7.3 (unaffected)
Vendor states this is fixed in 7.3-rc1 (unaffected)

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (8)

Source: cverecord
https://git.kernel.org/stable/c/fb1de260033c215dba438973d82b48562bdc86bb
Source: cverecord
https://git.kernel.org/stable/c/e9e64dd02fd68776afda00777591eca0c3984285
Source: cverecord
https://git.kernel.org/stable/c/33a44333a9dfda044b0e233399b12ead7f8a90ae
Source: cverecord
https://git.kernel.org/stable/c/d331c63570af61ef7aaf516b64a8d6f47518a3a4
Source: cverecord
https://git.kernel.org/stable/c/a83fcddf3c75d004f12aa13555bb73da19fb75a9
Source: cverecord
https://git.kernel.org/stable/c/4f6bd79bb7e55095f09bec9b4eb6c09df1306116
Source: cverecord
https://git.kernel.org/stable/c/5c5a795bf6248fe96f96dd9fd79d66bbb4a92077
Source: cverecord
https://git.kernel.org/stable/c/6645856f0df3aeecd45519cb611415b4b89c2223

Quick Info

StatusRECEIVED

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