What is CVE-2026-68453?

CVE-2026-68453 is a High severity Linux kernel vulnerability with a CVSS score of 7.1 out of 10, affecting Linux kernel versions from 5.4 onward and patched in 6.18.44, 7.1.8 and 7.2-rc6. CVE-2026-68453 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2026-68453?

CVE-2026-68453 has a CVSS score of 7.1 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:N/A:H.

Is there a patch available for CVE-2026-68453?

Yes, CVE-2026-68453 has been patched. Fixed versions include 6.18.44, 7.1.8 and 7.2-rc6. If you are running Linux kernel 5.4 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2026-68453 actively exploited?

CVE-2026-68453 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2026-68453

High

In the Linux kernel, the following vulnerability has been resolved: s390/zcrypt: Fix buffer over-read in cca_cipher2protkey Add validation of both the actual key buffer size and token length fields in all the cca_check_sec*token() functions. Additionally check in cca_gencipherkey() for possible underflow with returned key size. The CCA token structures contain user-controlled len fields that were used in operations without proper validation against both the actual buffer size and minimum token structure size. An attacker could set this field larger than the actual buffer size, leading to reading beyond buffer boundaries. This may result in a kernel crash or exposure of memory via sending this as part of a request down to the crypto card. Also an attacker could have used a very small len value and thus enforce a buffer under-run which may produce similar effects as a over-read. So now a key must - key buf length must be at least sizeof the token struct - the key len field inside the token must fit into the range of sizeof key token struct ... key buf length

Package Linux Kernel

Published 2026-08-13

Last modified 2026-08-13

CVSS version 3.1

Patch available

Yes

CVSS 3.1 score

7.1

out of 10

High

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

High

Vector string

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

Affected versions

Linux kernel versions 5.4 and later are affected. Fixed in 6.18.44, 7.1.8, 7.2-rc6 and their respective stable series.

Affected from

≥ 5.4

Fixed in

✓ 6.18.44 6.18.x ✓ 7.1.8 7.1.x ✓ 7.2-rc6

References

3 total

Details

CVE ID CVE-2026-68453

Severity High

CVSS score 7.1 / 10

CVSS version 3.1

Published 2026-08-13

Modified 2026-08-13

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2026-68453?

CVE-2026-68453 is a High severity Linux kernel vulnerability with a CVSS score of 7.1 out of 10 . It affects Linux kernel versions from 5.4 onward and has been patched in 6.18.44, 7.1.8 and 7.2-rc6. CVE-2026-68453 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2026-68453?

CVE-2026-68453 has a CVSS score of 7.1 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:N/A:H.
Is there a patch available for CVE-2026-68453?

Yes. CVE-2026-68453 has been patched. Fixed versions include 6.18.44, 7.1.8 and 7.2-rc6. If you are running Linux kernel 5.4 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2026-68453 actively exploited?

No. CVE-2026-68453 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.