CVE-2026-92514

Summary

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

RDMA/erdma: Fix CEQ tasklet use-after-free on removal

Each CEQ interrupt handler only schedules eqc->tasklet. The tasklet calls erdma_ceq_completion_handler(), which reads the DMA-coherent EQ ring through get_next_valid_eqe() and updates eq->dbrec through notify_eq().

erdma_ceqs_uninit() frees each CEQ IRQ and then destroys its EQ. free_irq() prevents another hard IRQ and waits for an in-flight handler, but it does not drain a tasklet that the handler already scheduled. The tasklet can therefore access eq->qbuf or eq->dbrec after erdma_eq_destroy() frees them.

Clearing ceq_cb->ready does not synchronize with a tasklet that already passed the check at the start of erdma_ceq_completion_handler().

Kill the tasklet after free_irq(), when no handler can schedule it again, and before erdma_ceq_uninit_one() releases the EQ buffers.

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxf2a0a630b953451a59a2612ad8c29246638f0a38 < 0e8b78dabb1f156db05ffe74c6eae861167c7c21affected
LinuxLinuxf2a0a630b953451a59a2612ad8c29246638f0a38 < 6e129c1310abfa786a510cc63e69c5ef12349048affected
LinuxLinuxf2a0a630b953451a59a2612ad8c29246638f0a38 < f738c0a372d36a10dfae6dc357717c13b2aa72f4affected
LinuxLinuxf2a0a630b953451a59a2612ad8c29246638f0a38 < a60c36d8d17f1b86705523d5eb6d290df28831e5affected
LinuxLinuxf2a0a630b953451a59a2612ad8c29246638f0a38 < 61a25b8d333e1eb2a189881d516f8d5194e26840affected
LinuxLinuxf2a0a630b953451a59a2612ad8c29246638f0a38 < 0ca79979384f031d710c4b3bae065dcb5d95aca3affected
LinuxLinux6.0affected
LinuxLinux0 < 6.0unaffected
LinuxLinux6.1.188 <= 6.1.*unaffected
LinuxLinux6.6.157 <= 6.6.*unaffected
LinuxLinux6.12.110 <= 6.12.*unaffected
LinuxLinux6.18.52 <= 6.18.*unaffected
LinuxLinux7.2.6 <= 7.2.*unaffected
LinuxLinux7.3-rc1 <= *unaffected

Weaknesses

References