CVE-2026-89738: Linux Linux

usb: gadget: at91_udc: drain polled-VBUS timer/work before udc is freed

CVSS 7.8 HighEPSS 0.0019 · 8th percentile

Published by the CVE Program (CNA: Linux) at 11 Sept 2026, 19:46 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it.

Affected products, as the CNA wrote them
Vendor	Product	Versions
Linux	Linux	affected 4037242c4f5ff77afe61bf07ca1e8a99490219e5 to before 2440ce54b8c4c8aa6963c181eb56164a466fbe1c git affected 4037242c4f5ff77afe61bf07ca1e8a99490219e5 to before 1674e34fe61ad3f5585dc833ba6bb6522912e6a5 git affected 4037242c4f5ff77afe61bf07ca1e8a99490219e5 to before 723d73b245843d4fff4c3f42e857c78c2b2d414e git affected 4037242c4f5ff77afe61bf07ca1e8a99490219e5 to before a2a602cb1e28d76a5398cec3fa21b0110385f501 git affected 4037242c4f5ff77afe61bf07ca1e8a99490219e5 to before 51a311eb97e91ce1aed3005cb71ccb2e30f8cce8 git affected 4037242c4f5ff77afe61bf07ca1e8a99490219e5 to before 557ef547d49ff5e6026a4d39bdd3113bd81d7688 git affected 4037242c4f5ff77afe61bf07ca1e8a99490219e5 to before c27d13ce4bab80fbdf6523928071b6c24b37606c git Other versions: unaffected
Linux	Linux	affected 2.6.36 unaffected before 2.6.36 semver unaffected 5.15.224 to 5.15., inclusive semver unaffected 6.1.191 to 6.1., inclusive semver unaffected 6.6.160 to 6.6., inclusive semver unaffected 6.12.109 to 6.12., inclusive semver unaffected 6.18.50 to 6.18., inclusive semver unaffected 7.2.4 to 7.2., inclusive semver unaffected 7.3 to *, inclusive original_commit_for_fix Other versions: affected

Identifiers

CVE-2026-89738

CNA

Linux

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Linux kernel's at91_udc USB gadget driver, in polled-VBUS mode, can use a freed device structure: its VBUS timer and work item may still run after the driver is removed or probe fails. The source does not state which attacker position is needed or what effects are possible beyond the use-after-free. Upgrade to a fixed kernel version: the fixes are listed for the stable branches 5.15.224, 6.1.191, 6.6.160 and 6.12.109 and later, with the affected range starting at commit 4037242c4f5ff77afe61bf07ca1e8a99490219e5. No workaround is listed.

Written 12 Nov 2026.

Not analysed yet

We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter.

Severity and exploitation

Score	Rating	CVSS	Vector	Source
7.8	High	3.1	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H	CNA (Linux)

CISA KEV Not listed.
EPSS 0.0019, the 8th percentile, on 14 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

This record came from the full history of the CVE Program, published 11 Sept 2026. New records show when each source confirmed them.

Sources

References from the CNA

Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description.