What is CVE-2026-43078?

CVE-2026-43078 is a High severity Linux kernel vulnerability with a CVSS score of 7.8 out of 10, classified as a Out-of-bounds Write flaw (CWE-787), affecting Linux kernel versions from 4.14 onward and patched in 5.10.254, 5.15.204, 6.1.170 and others. CVE-2026-43078 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2026-43078?

CVE-2026-43078 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-2026-43078?

Yes, CVE-2026-43078 has been patched. Fixed versions include 5.10.254, 5.15.204, 6.1.170 and others. If you are running Linux kernel 4.14 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2026-43078 actively exploited?

CVE-2026-43078 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is Out-of-bounds Write (CWE-787)?

The product writes data past the end or before the beginning of the intended buffer. See MITRE CWE for full details: https://cwe.mitre.org/data/definitions/787.html

CVE-2026-43078

High

In the Linux kernel, the following vulnerability has been resolved: crypto: af_alg - Fix page reassignment overflow in af_alg_pull_tsgl When page reassignment was added to af_alg_pull_tsgl the original loop wasn't updated so it may try to reassign one more page than necessary. Add the check to the reassignment so that this does not happen. Also update the comment which still refers to the obsolete offset argument.

Package Linux Kernel

Published 2026-05-06

Last modified 2026-05-20

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

Weakness type

CWE-787

CVE-2026-43078 is a Out-of-bounds Write vulnerability

What is Out-of-bounds Write?

The product writes data past the end or before the beginning of the intended buffer. Learn more on MITRE CWE

Affected versions

Linux kernel versions 4.14 and later are affected. Fixed in 5.10.254, 5.15.204, 6.1.170, 6.6.137, 6.12.85, 6.18.24, 6.19.14, 7.0 and their respective stable series.

Affected from

≥ 4.14

Fixed in

✓ 5.10.254 5.10.x ✓ 5.15.204 5.15.x ✓ 6.1.170 6.1.x ✓ 6.6.137 6.6.x ✓ 6.12.85 6.12.x ✓ 6.18.24 6.18.x ✓ 6.19.14 6.19.x ✓ 7.0

References

8 total

Kernel Git
https://git.kernel.org/stable/c/2b781d1d4f933990318bcc5c68fb75a717379e42

Patch
Kernel Git
https://git.kernel.org/stable/c/31d00156e50ecad37f2cb6cbf04aaa9a260505ef

Patch
Kernel Git
https://git.kernel.org/stable/c/710a4ce5d7afd9fe082c75dec282ab4a11c0fe71

Patch
Kernel Git
https://git.kernel.org/stable/c/9532501e0f1b200ea80baa0e33e0b06da10bb271

Patch
Kernel Git
https://git.kernel.org/stable/c/c8369a6d62f5abde9cbd4b62c45bf4b996be2468

Patch

Showing 5 of 8 references View all on NVD

Details

CVE ID CVE-2026-43078

Severity High

CVSS score 7.8 / 10

CVSS version 3.1

Published 2026-05-06

Modified 2026-05-20

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2026-43078?

CVE-2026-43078 is a High severity Linux kernel vulnerability with a CVSS score of 7.8 out of 10 , classified as an Out-of-bounds Write flaw (CWE-787) . It affects Linux kernel versions from 4.14 onward and has been patched in 5.10.254, 5.15.204, 6.1.170 and others. CVE-2026-43078 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2026-43078?

CVE-2026-43078 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-2026-43078?

Yes. CVE-2026-43078 has been patched. Fixed versions include 5.10.254, 5.15.204, 6.1.170 and others. If you are running Linux kernel 4.14 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2026-43078 actively exploited?

No. CVE-2026-43078 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.