Improper Locking Affecting kernel-zfcpdump package, versions <6.4.0-150700.53.73.2


Severity

Recommended
0.0
medium
0
10

Based on SUSE Linux Enterprise Server security rating.

Threat Intelligence

EPSS
0.09% (1st percentile)

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  • Snyk IDSNYK-SLES157-KERNELZFCPDUMP-18204656
  • published22 Jul 2026
  • disclosed21 Jul 2026

Introduced: 21 Jul 2026

NewCVE-2026-43319  (opens in a new tab)
CWE-667  (opens in a new tab)

How to fix?

Upgrade SLES:15.7 kernel-zfcpdump to version 6.4.0-150700.53.73.2 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream kernel-zfcpdump package and not the kernel-zfcpdump package as distributed by SLES. See How to fix? for SLES:15.7 relevant fixed versions and status.

In the Linux kernel, the following vulnerability has been resolved:

spi: spidev: fix lock inversion between spi_lock and buf_lock

The spidev driver previously used two mutexes, spi_lock and buf_lock, but acquired them in different orders depending on the code path:

write()/read(): buf_lock -> spi_lock ioctl(): spi_lock -> buf_lock

This AB-BA locking pattern triggers lockdep warnings and can cause real deadlocks:

WARNING: possible circular locking dependency detected spidev_ioctl() -> mutex_lock(&spidev->buf_lock) spidev_sync_write() -> mutex_lock(&spidev->spi_lock) *** DEADLOCK ***

The issue is reproducible with a simple userspace program that performs write() and SPI_IOC_WR_MAX_SPEED_HZ ioctl() calls from separate threads on the same spidev file descriptor.

Fix this by simplifying the locking model and removing the lock inversion entirely. spidev_sync() no longer performs any locking, and all callers serialize access using spi_lock.

buf_lock is removed since its functionality is fully covered by spi_lock, eliminating the possibility of lock ordering issues.

This removes the lock inversion and prevents deadlocks without changing userspace ABI or behaviour.

CVSS Base Scores

version 3.1