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CVE-2026-89845: scsi: qla2xxx: Avoid req_q_map double-read in qla2x00_error_entry()

• Severity: unknown
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-16 · updated 2026-10-19

Description

In the Linux kernel, the following vulnerability has been resolved: scsi: qla2xxx: Avoid req_q_map double-read in qla2x00_error_entry() qla2x00_error_entry() reads ha->req_q_map[que] twice: once for the NULL check and again when assigning it to req. The map slot is cleared by qla25xx_free_req_que() (ha->req_q_map[que_id] = NULL under mq_lock) during queue teardown, while the response-queue interrupt that drives qla2x00_error_entry() is still registered (the IRQ is released later in qla25xx_free_rsp_que()). If the slot is set to NULL between the two reads, req becomes NULL and is dereferenced. Read the slot once into req and NULL-check the local before use. mq_lock is a mutex and cannot be taken from interrupt context, so the single read plus local check is the appropriate fix for the reported NULL dereference.

Affected products

• Linux kernel: 3.4 — fixed in 7.3

How to fix

Upgrade to a fixed version: Linux kernel 7.3. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/1b995cf4157465357d66ba096e7cdaafab9972e7
• https://git.kernel.org/stable/c/1c90b74e484ba48f31944fe04963d99e01ac3767
• https://git.kernel.org/stable/c/35124cfa9898b2088ee72859e573e0876aff66fc
• https://git.kernel.org/stable/c/5dd9bec8004ba93cee8b689bf54ce294f59e5e3c
• https://git.kernel.org/stable/c/c845f2597787ef70159a32566669e308b2807a56
• https://git.kernel.org/stable/c/d79376fbd2a076de82c1cd8aa0b600b300c75a44
• https://git.kernel.org/stable/c/deb8abde83a799d2501f3977f6d6051000253f5e
• https://git.kernel.org/stable/c/fe04b31e386aee4cc3a18f07462af146037dc389

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