VulnerabilityPublished 27 May 2026Updated 6 Nov 2026

CVE-2026-46089: Linux kernel · zram: do not forget to endio for partial discard requests

Affects Linux kernelSource CVE Database V5

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Not known to be exploited · fixed in e3668b371329ea036ff022ce8ecc82f8befcf003 : update Linux kernel when convenient.

Data as of 6 Nov 2026, 16:34 UTC

Severity

Unrated

Rated by Threat Radar · No CVSS score from NVD or the CNA

Thin evidence

One scorer or none

Exploitation: No evidence of active exploitation and no public proof of concept
Automatable: Attackers cannot reliably automate steps 1–4 of the kill chain
Technical impact: Limited control over the software or limited information exposure

CISA SSVC assessment, 2026-11-06.

Patch

Available – fixed in e3668b371329ea036ff022ce8ecc82f8befcf003, a02363f71a79b755daa78a70d6b217f9c13c8c85, 68ce397e8236088fc53b9532d383a722288c8194 +2

Exploitation evidence

Disclosed: evidence found.
CVE published 27 May 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 6 Nov 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 0120dd6e4e202e19a0e011e486fb2da40a5ea279, < e3668b371329ea036ff022ce8ecc82f8befcf003	Fixed in e3668b371329ea036ff022ce8ecc82f8befcf003
LinuxLinux	Affected ≥ 0120dd6e4e202e19a0e011e486fb2da40a5ea279, < a02363f71a79b755daa78a70d6b217f9c13c8c85	Fixed in a02363f71a79b755daa78a70d6b217f9c13c8c85
LinuxLinux	Affected ≥ 0120dd6e4e202e19a0e011e486fb2da40a5ea279, < 68ce397e8236088fc53b9532d383a722288c8194	Fixed in 68ce397e8236088fc53b9532d383a722288c8194
LinuxLinux	Affected ≥ 0120dd6e4e202e19a0e011e486fb2da40a5ea279, < 35d3300f6357cfaa72db2721dc2b345b19bac5df	Fixed in 35d3300f6357cfaa72db2721dc2b345b19bac5df
LinuxLinux	Affected ≥ 0120dd6e4e202e19a0e011e486fb2da40a5ea279, < 2d1f18efccdb8b29552399d024c36b705447e975	Fixed in 2d1f18efccdb8b29552399d024c36b705447e975
LinuxLinux	Affected =6.4	Fixed in–

Description

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().

References

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