What is CVE-2026-68462?

CVE-2026-68462 is a High severity Linux kernel vulnerability with a CVSS score of 7.8 out of 10, affecting Linux kernel versions from 7.1 onward and patched in 7.1.5 and 7.2. CVE-2026-68462 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2026-68462?

CVE-2026-68462 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-2026-68462?

Yes, CVE-2026-68462 has been patched. Fixed versions include 7.1.5 and 7.2. If you are running Linux kernel 7.1 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2026-68462 actively exploited?

CVE-2026-68462 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2026-68462

High

In the Linux kernel, the following vulnerability has been resolved: bpf: Reject negative const offsets for buffer pointers The verifier rejects variable offsets for PTR_TO_TP_BUFFER and PTR_TO_BUF accesses, but it currently accepts a constant negative offset produced by pointer arithmetic. Commit 022ac0750883 ("bpf: use reg->var_off instead of reg->off for pointers") moved constant pointer offsets from reg->off to reg->var_off. However, __check_buffer_access() continued to check only the instruction offset. An access with reg->var_off equal to -8 and an instruction offset of zero therefore passes verification. For writable raw tracepoints, the access end is also calculated from the unsigned reg->var_off.value. An eight-byte access starting at -8 wraps the calculated end to zero, allowing the program to load and attach without increasing max_tp_access. After ensuring that reg->var_off is constant, calculate the effective access start using signed arithmetic and reject it when it is negative. Use the validated start to calculate the access end for both PTR_TO_TP_BUFFER and PTR_TO_BUF.

Package Linux Kernel

Published 2026-08-15

Last modified 2026-08-17

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 7.1 and later are affected. Fixed in 7.1.5, 7.2 and their respective stable series.

Affected from

≥ 7.1

Fixed in

✓ 7.1.5 7.1.x ✓ 7.2

References

2 total

Details

CVE ID CVE-2026-68462

Severity High

CVSS score 7.8 / 10

CVSS version 3.1

Published 2026-08-15

Modified 2026-08-17

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2026-68462?

CVE-2026-68462 is a High severity Linux kernel vulnerability with a CVSS score of 7.8 out of 10 . It affects Linux kernel versions from 7.1 onward and has been patched in 7.1.5 and 7.2. CVE-2026-68462 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2026-68462?

CVE-2026-68462 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-2026-68462?

Yes. CVE-2026-68462 has been patched. Fixed versions include 7.1.5 and 7.2. If you are running Linux kernel 7.1 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2026-68462 actively exploited?

No. CVE-2026-68462 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.