scsi: ufs: core: Avoid possible memory reclaim deadlock in TX EQTR context

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Summary

CVECVE-2026-93057
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-17 17:17:59 UTC
Updated2026-09-17 17:17:59 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: scsi: ufs: core: Avoid possible memory reclaim deadlock in TX EQTR context TX EQTR may run while devfreq gear scaling has quiesced the UFS tagset. In that context, functions ufshcd_tx_eqtr(), __ufshcd_tx_eqtr() and ufs_qcom_get_rx_fom() allocate memory with GFP_KERNEL. If direct reclaim is triggered, reclaim/writeback can depend on I/O to UFS device. Because the queue is quiesced, this can cause deadlock. Use memalloc_noio_save/restore() in ufshcd_tx_eqtr() to cover all allocations in the TX EQTR call tree, including: - params->eqtr_record in ufshcd_tx_eqtr() - eqtr_data in __ufshcd_tx_eqtr() - params in ufs_qcom_get_rx_fom() This is preferred over tagging individual call sites with GFP_NOIO, as it automatically covers any future allocations added anywhere in the call tree without requiring each caller to be aware of this constraint. [mkp: fix label as suggested by Bart]

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 03e5d38e2f985d8d0b0a60508c0b422f664808e3 a28a7d9b3bb116da788ae492c90465ec1a7fa6e8 git Not specified
CNA Linux Linux affected 03e5d38e2f985d8d0b0a60508c0b422f664808e3 760fc6f0e25a72832c2fcf37ecf5f1b770ec8374 git Not specified
CNA Linux Linux affected 7.1 Not specified
CNA Linux Linux unaffected 7.1 semver Not specified
CNA Linux Linux unaffected 7.2.6 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/760fc6f0e25a72832c2fcf37ecf5f1b770ec8374 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/a28a7d9b3bb116da788ae492c90465ec1a7fa6e8 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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