CVE-2025-21751

Summary

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

net/mlx5: HWS, change error flow on matcher disconnect

Currently, when firmware failure occurs during matcher disconnect flow, the error flow of the function reconnects the matcher back and returns an error, which continues running the calling function and eventually frees the matcher that is being disconnected. This leads to a case where we have a freed matcher on the matchers list, which in turn leads to use-after-free and eventual crash.

This patch fixes that by not trying to reconnect the matcher back when some FW command fails during disconnect.

Note that we're dealing here with FW error. We can't overcome this problem. This might lead to bad steering state (e.g. wrong connection between matchers), and will also lead to resource leakage, as it is the case with any other error handling during resource destruction.

However, the goal here is to allow the driver to continue and not crash the machine with use-after-free error.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux472dd792348f6601ccaa97d5626ee4faff891901 < 5682aad0276ff9b9b0eff3188eb6a1f504d6b436affected
LinuxLinux472dd792348f6601ccaa97d5626ee4faff891901 < 23a86c76a1a197e8fbbbd0ce3e826eb58c471624affected
LinuxLinux472dd792348f6601ccaa97d5626ee4faff891901 < 1ce840c7a659aa53a31ef49f0271b4fd0dc10296affected
LinuxLinux6.12affected
LinuxLinux0 < 6.12unaffected
LinuxLinux6.12.48 <= 6.12.*unaffected
LinuxLinux6.13.3 <= 6.13.*unaffected
LinuxLinux6.14 <= *unaffected

Weaknesses

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: no
    • Technical Impact: total

References