CVE-2026-98773Medium· 4.7▾ SunlitA flaw was found in the Linux kernel's CDC ACM (Communications Device Class Abstract Control Model) USB driver. A timing race condition during device disconnection and port closure can lead to a use-after-free vulnerability when communicat…
▾ Sunlit zone — Low / medium · no exploitation signal
impact 25.9 · likelihood 0 · exploitation 0
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Exploit-prediction probability, daily snapshots since Oct 20.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CSAF
0.2%
Last analysed / modified upstream
— → 4.7
none → medium
0.2% → 0.2%
A flaw was found in the Linux kernel's CDC ACM (Communications Device Class Abstract Control Model) USB driver. A timing race condition during device disconnection and port closure can lead to a use-after-free vulnerability when communication requests attempt to access already freed memory buffers. A local attacker could exploit this flaw to cause a Denial of Service (DoS) via a system crash or potentially achieve privilege escalation.
kernel: USB: cdc-acm: skip URB restart in port_shutdown if disconnected — rated Moderate by Red Hat. Released 2026-10-18, updated 2026-10-23.
Affected:
No fix planned:
Not affected:
Out of support scope
Field changes observed since this record was first indexed.
Connected by shared product, vendor, weakness, or advisory.
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