Description (CNA)
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 (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected f2a0a630b953451a59a2612ad8c29246638f0a38 before 0e8b78dabb1f156db05ffe74c6eae861167c7c21; affected f2a0a630b953451a59a2612ad8c29246638f0a38 before 6e129c1310abfa786a510cc63e69c5ef12349048; affected f2a0a630b953451a59a2612ad8c29246638f0a38 before f738c0a372d36a10dfae6dc357717c13b2aa72f4; affected f2a0a630b953451a59a2612ad8c29246638f0a38 before a60c36d8d17f1b86705523d5eb6d290df28831e5; affected f2a0a630b953451a59a2612ad8c29246638f0a38 before 61a25b8d333e1eb2a189881d516f8d5194e26840; affected f2a0a630b953451a59a2612ad8c29246638f0a38 before 0ca79979384f031d710c4b3bae065dcb5d95aca3 |
| Linux / Linux | affected 6.0; unaffected 0 before 6.0; unaffected 6.1.188 through 6.1.*; unaffected 6.6.157 through 6.6.*; unaffected 6.12.110 through 6.12.*; unaffected 6.18.52 through 6.18.*; unaffected 7.2.6 through 7.2.*; unaffected 7.3 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/0e8b78dabb1f156db05ffe74c6eae861167c7c21
- https://git.kernel.org/stable/c/6e129c1310abfa786a510cc63e69c5ef12349048
- https://git.kernel.org/stable/c/f738c0a372d36a10dfae6dc357717c13b2aa72f4
- https://git.kernel.org/stable/c/a60c36d8d17f1b86705523d5eb6d290df28831e5
- https://git.kernel.org/stable/c/61a25b8d333e1eb2a189881d516f8d5194e26840
- https://git.kernel.org/stable/c/0ca79979384f031d710c4b3bae065dcb5d95aca3