CVE-2026-89847

Description

In the Linux kernel, the following vulnerability has been resolved: scsi: qla2xxx: Avoid double completion in async IOCB timeout qla2x00_async_iocb_timeout() tries to abort a timed-out async IOCB. When qla24xx_async_abort_cmd() fails, both the SRB_LOGIN_CMD path and the SRB_CTRL_VP/default path scan outstanding_cmds[] for the SRB and then call sp->done(sp, QLA_FUNCTION_TIMEOUT) unconditionally, without checking whether the SRB was actually found and removed. If the response ISR completes the same handle first, it removes the SRB under qp_lock_ptr and runs sp->done() -> complete(sp->comp). The submitter qla24xx_control_vp() wakes from wait_for_completion(), clears sp->comp, drops its reference and returns, reclaiming the on-stack completion. The timer reference keeps the SRB alive across the timeout handler, but not the submitter's stack. The timeout then issues a second sp->done() -> qla_ctrlvp_sp_done(), which evaluates "if (sp->comp) complete(sp->comp)"; with the pointer loaded before the submitter's NULL store, complete() writes into the freed stack frame, a use-after-free. Track whether this path removed the SRB from outstanding_cmds and only call sp->done() when it did, so the command is completed exactly once by whichever path owns it. This mirrors the sp_found guard already used in qla24xx_abort_iocb_timeout().

CVSS 3.1 breakdown

Remediation

No fixed version is recorded in the NVD data. Check the vendor advisory for the latest guidance.

References

• https://git.kernel.org/stable/c/6e217a9482eabbd8b29847be334c74cf468d3544
• https://git.kernel.org/stable/c/71a7b6e3c7f121439f51a058e53d4a8e05b63dec
• https://git.kernel.org/stable/c/7257b5e1fb6c9387714f66e01b79ec82b717eede
• https://git.kernel.org/stable/c/845d4abd92cd2f97551356c8b281ad6e197acb07
• https://git.kernel.org/stable/c/9fa1d71233a82416492d9c9de9756ebe140fe714
• https://git.kernel.org/stable/c/bb45bc4bd53c95a7bf6f782577b5ede94c0f8aa8
• https://git.kernel.org/stable/c/d6d856c722f40f0694ff755208552e658db6dd42
• https://git.kernel.org/stable/c/f5b660e0b0d9190d8853c795c2522cc5f8c93003

Frequently asked