fbnic: close fw_log race between users and teardown

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Summary

CVECVE-2026-45977
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-27 14:17:14 UTC
Updated2026-05-27 14:48:03 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: fbnic: close fw_log race between users and teardown Fixes a theoretical race on fw_log between the teardown path and fw_log write functions. fw_log is written inside fbnic_fw_log_write() and can be reached from the mailbox handler fbnic_fw_msix_intr(), but fw_log is freed before IRQ/MBX teardown during cleanup, resulting in a potential data race of dereferencing a freed/null variable. Possible Interleaving Scenario: CPU0: fbnic_fw_msix_intr() // Entry fbnic_fw_log_write() if (fbnic_fw_log_ready()) // true ... preempt ... CPU1: fbnic_remove() // Entry fbnic_fw_log_free() vfree(log->data_start); log->data_start = NULL; CPU0: continues, walks log->entries or writes to log->data_start The initialization also has an incorrect order problem, as the fw_log is currently allocated after MBX setup during initialization. Fix the problems by adjusting the synchronization order to put initialization in place before the mailbox is enabled, and not cleared until after the mailbox has been disabled.

Risk And Classification

EPSS: 0.000170000 probability, percentile 0.042650000 (date 2026-06-01)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected ecc53b1b46c892d2e3cf3cf4393b6d219dc4ae3f 223cfef4812bdfa5ac5c1aa761cdba03cfe2c9cd git Not specified
CNA Linux Linux affected ecc53b1b46c892d2e3cf3cf4393b6d219dc4ae3f 5f10ab3643c58a22fbaee92c4701b00fcb4a465d git Not specified
CNA Linux Linux affected ecc53b1b46c892d2e3cf3cf4393b6d219dc4ae3f ee5492fd88cfc079c19fbeac78e9e53b7f6c04f3 git Not specified
CNA Linux Linux affected 6.17 Not specified
CNA Linux Linux unaffected 6.17 semver Not specified
CNA Linux Linux unaffected 6.18.14 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19.4 6.19.* semver Not specified
CNA Linux Linux unaffected 7.0 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/ee5492fd88cfc079c19fbeac78e9e53b7f6c04f3 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/223cfef4812bdfa5ac5c1aa761cdba03cfe2c9cd 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/5f10ab3643c58a22fbaee92c4701b00fcb4a465d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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