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CVE-2026-89847

scsi: qla2xxx: Avoid double completion in async IOCB timeout

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 5.10.270, 5.15.221, 6.1.188, 6.6.157, 6.12.110, and 2 more
None on Exploit-DB, Metasploit or GitHub

Summary

The vulnerability affects the Linux kernel's QLogic Fibre Channel storage driver (qla2xxx), which manages SCSI commands sent to SAN storage devices. A race in the handling of timed-out asynchronous commands can cause a command to be completed twice, leading to a use-after-free of kernel memory, which can crash the system or potentially allow privilege escalation.

Summarized by anthropic/claude-haiku-5.5. Verify details against the original sources.

Read the original 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().

Timeline

  1. CVE published
  2. Record last updated

Affected versions

  • Linux Linux

    From f6145e86d21fccd59bbb87bc1e1eb076658fd79a · fixed in 71a7b6e3c7f121439f51a058e53d4a8e05b63dec; From f6145e86d21fccd59bbb87bc1e1eb076658fd79a · fixed in 7257b5e1fb6c9387714f66e01b79ec82b717eede; From f6145e86d21fccd59bbb87bc1e1eb076658fd79a · fixed in f5b660e0b0d9190d8853c795c2522cc5f8c93003; From f6145e86d21fccd59bbb87bc1e1eb076658fd79a · fixed in 6e217a9482eabbd8b29847be334c74cf468d3544; From f6145e86d21fccd59bbb87bc1e1eb076658fd79a · fixed in d6d856c722f40f0694ff755208552e658db6dd42; From f6145e86d21fccd59bbb87bc1e1eb076658fd79a · fixed in 9fa1d71233a82416492d9c9de9756ebe140fe714; From f6145e86d21fccd59bbb87bc1e1eb076658fd79a · fixed in 845d4abd92cd2f97551356c8b281ad6e197acb07; From f6145e86d21fccd59bbb87bc1e1eb076658fd79a · fixed in bb45bc4bd53c95a7bf6f782577b5ede94c0f8aa8

  • Linux Linux

    4.19

  • KernelLinux

    From 4.19.0 · fixed in 5.10.270; From 5.11.0 · fixed in 5.15.221; From 5.16.0 · fixed in 6.1.188; From 6.2.0 · fixed in 6.6.157; From 6.7.0 · fixed in 6.12.110; From 6.13.0 · fixed in 6.18.51; From 6.19.0 · fixed in 7.2.5

References 8

git.kernel.org