PT-2026-43957 · Linux · Linux

Avinesh Kumar + 1 · Published 2026-05-27 · Updated 2026-05-27 · CVE-2026-46089

Mitre

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().

Related Identifiers

CVE-2026-46089

Affected Products

Linux

References · 6

• https://nvd.nist.gov/vuln/detail/CVE-2026-46089 · Security Note
• https://git.kernel.org/stable/c/2d1f18efccdb8b29552399d024c36b705447e975 · Note
• https://git.kernel.org/stable/c/e3668b371329ea036ff022ce8ecc82f8befcf003 · Note
• https://git.kernel.org/stable/c/68ce397e8236088fc53b9532d383a722288c8194 · Note
• https://git.kernel.org/stable/c/35d3300f6357cfaa72db2721dc2b345b19bac5df · Note
• https://git.kernel.org/stable/c/a02363f71a79b755daa78a70d6b217f9c13c8c85 · Note