What is CVE-2026-46155?

CVE-2026-46155 is a Critical severity Linux kernel vulnerability with a CVSS score of 9.1 out of 10, affecting Linux kernel versions from 6.6.32 onward and patched in 6.6.140, 6.12.88, 6.18.30 and others. CVE-2026-46155 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2026-46155?

CVE-2026-46155 has a CVSS score of 9.1 out of 10, rated Critical severity. The vector string is CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H.

Is there a patch available for CVE-2026-46155?

Yes, CVE-2026-46155 has been patched. Fixed versions include 6.6.140, 6.12.88, 6.18.30 and others. If you are running Linux kernel 6.6.32 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2026-46155 actively exploited?

CVE-2026-46155 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2026-46155

Critical

In the Linux kernel, the following vulnerability has been resolved: smb/client: fix out-of-bounds read in smb2_compound_op() If a server sends a truncated response but a large OutputBufferLength, and terminates the EA list early, check_wsl_eas() returns success without validating that the entire OutputBufferLength fits within iov_len. Then smb2_compound_op() does: memcpy(idata->wsl.eas, data[0], size[0]); Where size[0] is OutputBufferLength. If iov_len is smaller than size[0], memcpy can read beyond the end of the rsp_iov allocation and leak adjacent kernel heap memory.

Package Linux Kernel

Published 2026-05-28

Last modified 2026-05-30

CVSS version 3.1

Patch available

Yes

CVSS 3.1 score

9.1

out of 10

Critical

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

High

Vector string

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

Affected versions

Linux kernel versions 6.6.32, 6.9 and later are affected. Fixed in 6.6.140, 6.12.88, 6.18.30, 7.0.7, 7.1-rc3 and their respective stable series.

Affected from

≥ 6.6.32 ≥ 6.9

Fixed in

✓ 6.6.140 6.6.x ✓ 6.12.88 6.12.x ✓ 6.18.30 6.18.x ✓ 7.0.7 7.0.x ✓ 7.1-rc3

References

The following references provide additional information about CVE-2026-46155 including vendor advisories, patch commits, exploit details, and third-party analysis. Links are sourced from the NIST NVD database.

Kernel patch commit
https://git.kernel.org/stable/c/512d33bc8ea4ea5c19728ee118715f4b1f4d1926
Patch
Kernel patch commit
https://git.kernel.org/stable/c/8d09328dfda089675e4c049f3f256064a1d1996b
Patch
Kernel patch commit
https://git.kernel.org/stable/c/9b3af35645ff9cd334edc130249f9a2fb2bea25f
Patch

5 patch commits total View all on NVD

Details

CVE ID CVE-2026-46155

Severity Critical

CVSS score 9.1 / 10

CVSS version 3.1

Published 2026-05-28

Modified 2026-05-30

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2026-46155?

CVE-2026-46155 is a Critical severity Linux kernel vulnerability with a CVSS score of 9.1 out of 10 . It affects Linux kernel versions from 6.6.32 onward and has been patched in 6.6.140, 6.12.88, 6.18.30 and others. CVE-2026-46155 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2026-46155?

CVE-2026-46155 has a CVSS score of 9.1 out of 10, rated Critical severity (CVSS 3.1). The vector string is CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H.
Is there a patch available for CVE-2026-46155?

Yes — CVE-2026-46155 has been patched. Fixed versions include 6.6.140, 6.12.88, 6.18.30 and others. If you are running Linux kernel 6.6.32 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2026-46155 actively exploited?

No — CVE-2026-46155 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.