What is CVE-2026-68399?

CVE-2026-68399 is a High severity Linux kernel vulnerability with a CVSS score of 7.8 out of 10, affecting Linux kernel versions from 5.2 onward and patched in 7.1.6 and 7.2. CVE-2026-68399 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2026-68399?

CVE-2026-68399 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-2026-68399?

Yes, CVE-2026-68399 has been patched. Fixed versions include 7.1.6 and 7.2. If you are running Linux kernel 5.2 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2026-68399 actively exploited?

CVE-2026-68399 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2026-68399

High

In the Linux kernel, the following vulnerability has been resolved: bpf: Fix UAF in sock clone early bailouts Similar to recent commit 9b51a6155d14 ("bpf,fork: wipe ->bpf_storage before bailouts that access it"), sk_clone() performs an initial shallow copy of the socket field ->sk_bpf_storage via sock_copy() for the cloned socket newsk. If sk_clone() bails out early (e.g. if sk_filter_charge() fails) prior to calling bpf_sk_storage_clone(), newsk->sk_bpf_storage still points to the parent socket's BPF local storage. When newsk is subsequently freed via sk_free(), the deallocation path (__sk_destruct() -> bpf_sk_storage_free()) destroys the parent socket's BPF local storage, leading to a use-after-free (UAF) on the parent socket. Fix this by resetting newsk->sk_bpf_storage to NULL immediately after sock_copy() in sk_clone(), and remove the now redundant initialization from bpf_sk_storage_clone().

Package Linux Kernel

Published 2026-08-10

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 5.2 and later are affected. Fixed in 7.1.6, 7.2 and their respective stable series.

Affected from

≥ 5.2

Fixed in

✓ 7.1.6 7.1.x ✓ 7.2

References

2 total

Details

CVE ID CVE-2026-68399

Severity High

CVSS score 7.8 / 10

CVSS version 3.1

Published 2026-08-10

Modified 2026-08-17

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2026-68399?

CVE-2026-68399 is a High severity Linux kernel vulnerability with a CVSS score of 7.8 out of 10 . It affects Linux kernel versions from 5.2 onward and has been patched in 7.1.6 and 7.2. CVE-2026-68399 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2026-68399?

CVE-2026-68399 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-2026-68399?

Yes. CVE-2026-68399 has been patched. Fixed versions include 7.1.6 and 7.2. If you are running Linux kernel 5.2 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2026-68399 actively exploited?

No. CVE-2026-68399 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.