What is CVE-2026-99083?

CVE-2026-99083 is a High severity Linux kernel vulnerability with a CVSS score of 8.8 out of 10. CVE-2026-99083 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2026-99083?

CVE-2026-99083 has a CVSS score of 8.8 out of 10, rated High severity. The vector string is CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

Is there a patch available for CVE-2026-99083?

Yes, CVE-2026-99083 has been patched. Fixed versions include 6.6.160, 6.12.114, 6.18.58 and others.

Is CVE-2026-99083 actively exploited?

CVE-2026-99083 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2026-99083

High

In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix heap out-of-bounds write in krb5_authenticate() In krb5_authenticate(), out_len is calculated to determine available headroom in response_buf for the incoming Kerberos AP-REP token. However, when SMB2_SESSION_SETUP is processed as a non-first element of a compounded SMB2 request, the calculation omits work->next_smb2_rsp_hdr_off. This causes out_len to overstate remaining buffer headroom by the cumulative size of prior responses in the compound chain. Consequently, the length check in ksmbd_krb5_authenticate() (*out_len <= resp->spnego_blob_len) passes erroneously, allowing memcpy() to write the AP-REP blob past the end of response_buf into adjacent kernel heap memory. Fix this by subtracting work->next_smb2_rsp_hdr_off when computing out_len, ensuring it accurately reflects physical remaining buffer space.

Package Linux Kernel

Published 2026-10-23

Last modified 2026-10-24

CVSS version 3.1

Patch available

Yes

CVSS 3.1 score

8.8

out of 10

High

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Vector string

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

Affected versions

Fixed in 6.6.160, 6.12.114, 6.18.58, 7.2.12, 7.3 and their respective stable series.

Fixed in

✓ 6.6.160 6.6.x ✓ 6.12.114 6.12.x ✓ 6.18.58 6.18.x ✓ 7.2.12 7.2.x ✓ 7.3

References

5 total

Details

CVE ID CVE-2026-99083

Severity High

CVSS score 8.8 / 10

CVSS version 3.1

Published 2026-10-23

Modified 2026-10-24

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2026-99083?

CVE-2026-99083 is a High severity Linux kernel vulnerability with a CVSS score of 8.8 out of 10 . CVE-2026-99083 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2026-99083?

CVE-2026-99083 has a CVSS score of 8.8 out of 10, rated High severity (CVSS 3.1). The vector string is CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
Is there a patch available for CVE-2026-99083?

Yes. CVE-2026-99083 has been patched. Fixed versions include 6.6.160, 6.12.114, 6.18.58 and others.
Is CVE-2026-99083 actively exploited?

No. CVE-2026-99083 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.