CVE-2026-46089 PUBLISHED

zram: do not forget to endio for partial discard requests

Assigner: Linux
Reserved: 13.05.2026 Published: 27.05.2026 Updated: 27.05.2026

In 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().

Product Status

Vendor Linux
Product Linux
Versions Default: unaffected
  • affected from 0120dd6e4e202e19a0e011e486fb2da40a5ea279 to 2d1f18efccdb8b29552399d024c36b705447e975 (excl.)
  • affected from 0120dd6e4e202e19a0e011e486fb2da40a5ea279 to 35d3300f6357cfaa72db2721dc2b345b19bac5df (excl.)
  • affected from 0120dd6e4e202e19a0e011e486fb2da40a5ea279 to a02363f71a79b755daa78a70d6b217f9c13c8c85 (excl.)
  • affected from 0120dd6e4e202e19a0e011e486fb2da40a5ea279 to 68ce397e8236088fc53b9532d383a722288c8194 (excl.)
  • affected from 0120dd6e4e202e19a0e011e486fb2da40a5ea279 to e3668b371329ea036ff022ce8ecc82f8befcf003 (excl.)
Vendor Linux
Product Linux
Versions Default: affected
  • Version 6.4 is affected
  • unaffected from 0 to 6.4 (excl.)
  • unaffected from 6.6.140 to 6.6.* (incl.)
  • unaffected from 6.12.86 to 6.12.* (incl.)
  • unaffected from 6.18.27 to 6.18.* (incl.)
  • unaffected from 7.0.4 to 7.0.* (incl.)
  • unaffected from 7.1-rc1 to * (incl.)

References