What is CVE-2026-90043?

CVE-2026-90043 is a High severity Linux kernel vulnerability with a CVSS score of 7.8 out of 10, affecting Linux kernel versions from 7.0 onward and patched in 7.2.5 and 7.3-rc1. CVE-2026-90043 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2026-90043?

CVE-2026-90043 has a CVSS score of 7.8 out of 10, rated High severity. The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

Is there a patch available for CVE-2026-90043?

Yes, CVE-2026-90043 has been patched. Fixed versions include 7.2.5 and 7.3-rc1. If you are running Linux kernel 7.0 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2026-90043 actively exploited?

CVE-2026-90043 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2026-90043

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 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.

Package Linux Kernel

Published 2026-09-16

Last modified 2026-09-16

CVSS version 3.1

Patch available

Yes

CVSS 3.1 score

7.8

out of 10

High

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Vector string

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected versions

Linux kernel versions 7.0 and later are affected. Fixed in 7.2.5, 7.3-rc1 and their respective stable series.

Affected from

≥ 7.0

Fixed in

✓ 7.2.5 7.2.x ✓ 7.3-rc1

References

2 total

Details

CVE ID CVE-2026-90043

Severity High

CVSS score 7.8 / 10

CVSS version 3.1

Published 2026-09-16

Modified 2026-09-16

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2026-90043?

CVE-2026-90043 is a High severity Linux kernel vulnerability with a CVSS score of 7.8 out of 10 . It affects Linux kernel versions from 7.0 onward and has been patched in 7.2.5 and 7.3-rc1. CVE-2026-90043 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2026-90043?

CVE-2026-90043 has a CVSS score of 7.8 out of 10, rated High severity (CVSS 3.1). The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
Is there a patch available for CVE-2026-90043?

Yes. CVE-2026-90043 has been patched. Fixed versions include 7.2.5 and 7.3-rc1. If you are running Linux kernel 7.0 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2026-90043 actively exploited?

No. CVE-2026-90043 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.