zram: do not forget to endio for partial discard requests

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Summary

CVECVE-2026-46089
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-27 14:17:30 UTC
Updated2026-05-27 14:48:03 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: zram: do not forget to endio for partial discard requests As reported by Qu Wenruo and Avinesh Kumar, the following getconf PAGESIZE 65536 blkdiscard -p 4k /dev/zram0 takes literally forever to complete. zram doesn't support partial discards and just returns immediately w/o doing any discard work in such cases. The problem is that we forget to endio on our way out, so blkdiscard sleeps forever in submit_bio_wait(). Fix this by jumping to end_bio label, which does bio_endio().

Risk And Classification

EPSS: 0.000180000 probability, percentile 0.051520000 (date 2026-05-28)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 0120dd6e4e202e19a0e011e486fb2da40a5ea279 2d1f18efccdb8b29552399d024c36b705447e975 git Not specified
CNA Linux Linux affected 0120dd6e4e202e19a0e011e486fb2da40a5ea279 35d3300f6357cfaa72db2721dc2b345b19bac5df git Not specified
CNA Linux Linux affected 0120dd6e4e202e19a0e011e486fb2da40a5ea279 a02363f71a79b755daa78a70d6b217f9c13c8c85 git Not specified
CNA Linux Linux affected 0120dd6e4e202e19a0e011e486fb2da40a5ea279 68ce397e8236088fc53b9532d383a722288c8194 git Not specified
CNA Linux Linux affected 0120dd6e4e202e19a0e011e486fb2da40a5ea279 e3668b371329ea036ff022ce8ecc82f8befcf003 git Not specified
CNA Linux Linux affected 6.4 Not specified
CNA Linux Linux unaffected 6.4 semver Not specified
CNA Linux Linux unaffected 6.6.140 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.86 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.27 6.18.* semver Not specified
CNA Linux Linux unaffected 7.0.4 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/68ce397e8236088fc53b9532d383a722288c8194 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/a02363f71a79b755daa78a70d6b217f9c13c8c85 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/35d3300f6357cfaa72db2721dc2b345b19bac5df 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/e3668b371329ea036ff022ce8ecc82f8befcf003 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/2d1f18efccdb8b29552399d024c36b705447e975 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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