CVE-2026-97530
UnknownSummary
In the Linux kernel, a vulnerability in the qla2xxx SCSI driver causes a CPU soft lockup. The functions qla27xx_copy_multiple_pkt() and qla27xx_copy_fpin_pkt() poll the signature field in the response structure, but in continuation IOCBs this field contains FC frame payload that may accidentally equal 0xDEADDEAD, leading to an infinite loop.
Risk Assessment
An attacker able to send specially crafted FC frames to a system with the vulnerable driver can cause a CPU hang, resulting in denial of service (DoS) and system unavailability.
Recommendation
Apply the patch from the Linux kernel vendor that removes the unnecessary signature polling and adds proper gating for the FPIN path. Update the kernel to a version containing the fix.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: scsi: qla2xxx: Fix soft lockup polling continuation IOCB signature qla27xx_copy_multiple_pkt() and qla27xx_copy_fpin_pkt() poll rsp_q->ring_ptr->signature for RESPONSE_PROCESSED (0xDEADDEAD) to decide whether the next continuation IOCB has arrived, spinning on cpu_relax() without advancing the ring or decrementing the entry count while it has not. response_t::signature lives at byte offset 60, but a continuation IOCB (sts_cont_entry_t / struct sts_cont_entry_ext) carries raw FC frame payload at that offset (data[56..59]). A received frame whose payload bytes happen to equal 0xDEADDEAD is therefore misread as "not yet arrived", and the loop spins forever in interrupt/DPC context, causing a CPU soft lockup. The poll is also unnecessary: callers of qla27xx_copy_multiple_pkt() (PT_LS4_UNSOL and the NVMe purls path) already gate on qla_chk_cont_iocb_avail(), which guarantees all entry_count IOCBs are present before copying begins. The sibling helper __qla_copy_purex_to_buffer() already drops the signature poll and relies on the entry_type == STATUS_CONT_TYPE guard instead. Remove the signature busy-wait from both helpers, keeping the entry_type guard, and gate the FPIN path with qla_chk_cont_iocb_avail() so it defers and re-processes on the next interrupt once all continuation IOCBs have arrived, mirroring the ELS_AUTH_ELS and PT_LS4_UNSOL arms. With this the signature field is never read on a continuation IOCB, eliminating the payload-aliasing lockup.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS