In the Linux kernel, the following vulnerability has been resolved:
gpib: fix double decrement of descriptor_busy in command_ioctl()
commit d1857f8296dc ("gpib: fix use-after-free in IO ioctl handlers")
introduced a descriptor_busy reference counter to pin struct
gpib_descriptor across IO ioctl operations. In command_ioctl(), the
error path inside the loop decrements descriptor_busy and breaks, but
execution then falls through to the unconditional decrement after the
loop, underflowing the counter to -1.
This re-enables the use-after-free that the original fix was meant to
prevent: a concurrent close_dev_ioctl() sees descriptor_busy == 0 on
an actively-used descriptor and frees it.
Remove the early decrement from the error path. The post-loop
decrement already handles all exit paths, matching the correct pattern
used in read_ioctl() and write_ioctl().
References
Configurations
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History
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Information
Published : 2026-08-15 06:22
Updated : 2026-08-17 06:19
NVD link : CVE-2026-72482
Mitre link : CVE-2026-72482
CVE.ORG link : CVE-2026-72482
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Products Affected
No product.
CWE
No CWE.