CVE-2026-80860

Summary

In the Linux kernel, the following vulnerability has been resolved:

fuse: fix race between interrupt and resend

After commit f8fce75fedf7 ("fuse: clear intr_entry in fuse_resend and fuse_remove_pending_req") the WARN_ON(!list_empty(&req->intr_entry)) in fuse_request_free() still triggers due to the following race:

In request_wait_answer() if (test_bit(FR_SENT, &req->flags)) -> returns true

In fuse_chan_resend() clear_bit(FR_SENT, &req->flags)

In request_wait_answer() queue_interrupt(req)

Fix by:

  • move clearing FR_SENT inside fpq->lock

  • move setting FR_PENDING inside fiq->lock

  • recheck FR_SENT after acquiring fiq->lock in fuse_dev_queue_interrupt()

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxf8fce75fedf73ac72aa09163deb8f4291fdcaad2 < 26fbe4bc3ef3ab0200407681cbef182af5d151deaffected
LinuxLinuxf8fce75fedf73ac72aa09163deb8f4291fdcaad2 < ed9c881f3b498383f73c42712b359419da42a7b0affected
LinuxLinux1d8ecd0cd696a5df0b2f72046a4ccee5d2a8ec2caffected
LinuxLinux7366e6f4d2b4c7002b13fb01219e83679dad4127affected
LinuxLinux893479015cb6442fd389d3b553ab3036c9541715affected
LinuxLinux6.12.96 < 6.13affected
LinuxLinux6.18.39 < 6.19affected
LinuxLinux7.1.4 < 7.2affected
LinuxLinux7.2affected
LinuxLinux0 < 7.2unaffected
LinuxLinux7.2.3 <= 7.2.*unaffected
LinuxLinux7.3-rc1 <= *unaffected

Weaknesses

References