CVE-2026-89738Medium· 5.5▾ SunlitA flaw was found in the Linux kernel's `at91_udc` USB gadget driver. In polled-VBUS mode, a timing issue during driver unbinding or probe failure can lead to a use-after-free vulnerability. A local attacker could exploit this by triggering…
▾ Sunlit zone — Low / medium · no exploitation signal
impact 30.3 · likelihood 0 · exploitation 0
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Exploit-prediction probability, daily snapshots since Sep 12.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CSAF
0.2%
— → 4.1
— → 4.1
none → medium
— → 7.8
none → high
7.8 → 4.1
high → medium
4.1 → 7.8
medium → high
7.8 → 4.1
high → medium
Last analysed / modified upstream
4.1 → 5.5
A flaw was found in the Linux kernel's at91_udc USB gadget driver. In polled-VBUS mode, a timing issue during driver unbinding or probe failure can lead to a use-after-free vulnerability. A local attacker could exploit this by triggering a normal driver unbind operation, which may interleave with an already queued work item. This could result in system instability or a denial of service (DoS) due to the driver attempting to access freed memory.
kernel: usb: gadget: at91_udc: drain polled-VBUS timer/work before udc is freed — rated Moderate by Red Hat. Released 2026-09-11, updated 2026-09-21.
Not affected:
Refer to the advisory for fix availability.
Field changes observed since this record was first indexed.
Connected by shared product, vendor, weakness, or advisory.
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