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CVE-2026-90043

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: zram: fix slot lock bit position on big-endian 64-bit The slot lock is a bit operation on the whole __lock word, which flags an…

Published Sep 16, 2026EPSS 0.17%

Overview

CVE-2026-90043 is a high-severity vulnerability. It was published on September 16, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

In the Linux kernel, the following vulnerability has been resolved:

zram: fix slot lock bit position on big-endian 64-bit

The slot lock is a bit operation on the whole __lock word, which flags and

ac_time alias as two u32s. On little-endian the lock bit lands in the

position ZRAM_ENTRY_LOCK reserves in flags, so the aliasing works out. On

64-bit big-endian it lands in ac_time instead: with

ZRAM_TRACK_ENTRY_ACTIME enabled, storing the access time from

mark_slot_accessed() or slot_free() wipes out the held lock bit, letting

another CPU take the same slot lock; an access time value with that bit

set makes the slot look locked forever.

Shift the lock bit into the flags half of the word on big-endian 64-bit.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/052b6b2d5fe97547bd2cdb73fa894f6cfea68b11Refgit.kernel.org/stable/c/a8b5875741d416703e19ad8eeac6fce8a12bd6e4

How CyberStrike helps

Frequently asked questions

What is CVE-2026-90043?

CVE-2026-90043 is a high-severity vulnerability. It was published on September 16, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2026-90043?

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-90043?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-90043?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-90043 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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