Skip to content
CVE PROGRAM SOURCE RECORDUnscored

CVE-2026-97530

scsi: qla2xxx: Fix soft lockup polling continuation IOCB signature

Read JSON ↗CVE.org ↗
Status
Published
Published
Updated
Assigning organization
Linux

Description

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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • 9f2475fe7406b8ef5f97099c4980021344872d9f to < 428e244dd4066abd40ca1ec525b7aab9a9db8296affected
  • 9f2475fe7406b8ef5f97099c4980021344872d9f to < 3e58eb888ebf265af937f636d05997c60d2f197caffected
  • 9f2475fe7406b8ef5f97099c4980021344872d9f to < 6e6c2ba9022eb8f9b062c81bdc6fd24c7b4c4c16affected
  • 9f2475fe7406b8ef5f97099c4980021344872d9f to < 6aa722fca9d2aa1f64094101587f8f4a2f83f6aaaffected
  • 9f2475fe7406b8ef5f97099c4980021344872d9f to < d7e3fa7d06bf7fcaac186d3c4d635caac166d36caffected

Linux Linux

Default version status: affected

  • 5.9affected
  • 0 to < 5.9unaffected
  • 6.6.160 to ≤ 6.6.*unaffected
  • 6.12.112 to ≤ 6.12.*unaffected
  • 6.18.53 to ≤ 6.18.*unaffected
  • 7.2.7 to ≤ 7.2.*unaffected
  • 7.3 to ≤ *unaffected

References