Medium [CVE-2026-63874] fix race between urb completion and rx_retry cancellation
This medium-severity Red Hat Linux advisory covers CVE-2026-63874.
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Summary
In the Linux kernel, the following vulnerability has been resolved: net: mctp: usb: fix race between urb completion and rx_retry cancellation It's possible that sequencing between setting ->stopped and cancelling the rx_retry work (in ndo_stop) could leave us with an urb queued: T1: ndo_stop T2: rx_retry_work ------------ ---------------- LD: ->stopped => false ST: ->stopped rx_stopped, and cancelling pending work, we know that the requeue cannot occur, so all that's left is killing any pending urb.
A flaw was found in the Linux kernel's USB Management Component Transport Protocol (MCTP) driver. A race condition exists between the completion of a USB Request Block (URB) and the cancellation of retry operations during the driver's shutdown process.
This timing issue can cause a URB to be re-queued, potentially leading to unexpected system behavior or resource management issues. This vulnerability could impact system stability.
Red Hat severity: Moderate. Weakness: CWE-367.
Red Hat lists Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9 as not affected.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative. Check it before change work.
Official advisory · medium-confidence parse· fetched 7 days ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists. Confirm against the vendor advisory.
Official advisory · medium-confidence parse· fetched 7 days ago·verify at source
Mitigation
The source record does not include mitigation steps. That does not mean no fix exists. Read the vendor advisory below for the authoritative guidance.
Official advisory · medium-confidence parse· fetched 7 days ago·verify at source
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