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CVE-2026-74479

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: net: pktgen: fix proc entry use-after-free pktgen_change_name() replaces pkt_dev->entry while holding t->if_lock.

Published Aug 15, 2026EPSS 0.13%

Overview

CVE-2026-74479 is a high-severity vulnerability. It was published on August 15, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

In the Linux kernel, the following vulnerability has been resolved:

net: pktgen: fix proc entry use-after-free

pktgen_change_name() replaces pkt_dev->entry while holding t->if_lock.

pktgen_remove_device() removes the same entry before

_rem_dev_from_if_list() takes that lock.

This allows the following interleaving:

CPU 0 (NETDEV_CHANGENAME) CPU 1 (kpktgend)

if_lock(t)

proc_remove(pkt_dev->entry)

proc_remove(pkt_dev->entry)

pkt_dev->entry = proc_create_data(...)

if_unlock(t)

The kthread can pass the stale proc_dir_entry to proc_remove() after the

rename path has freed it. A reproducer with a widened race window reports:

BUG: KASAN: slab-use-after-free in proc_remove+0x78/0x80

Read of size 8 at addr ffff8881478fea70 by task kpktgend_0/67

Call Trace:

proc_remove+0x78/0x80

pktgen_remove_device.isra.0+0x11c/0x4c0

pktgen_thread_worker+0x1214/0x6bc0

kthread+0x2c6/0x3b0

Allocated by task 95:

__proc_create+0x204/0x790

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/4ef801b838d85c0ea5852c50667f7344ce3b6cd0Refgit.kernel.org/stable/c/577443530cb592d5782a1f79847411a9363a65c8Refgit.kernel.org/stable/c/7991c7cff8b8622cddb3d8dee07dbe74aa4cbec4Refgit.kernel.org/stable/c/817ff6efdb7f484ea547218e11e17d8e43daa3b4Refgit.kernel.org/stable/c/82ed3db9269cb61e3c15bad2f6e221efce90e1e0Refgit.kernel.org/stable/c/b006a5404470bd3eb2aa0425fc447183032047efRefgit.kernel.org/stable/c/d1cc9797cf8f7aeb87e7ad01b748c6a960a819e4Refgit.kernel.org/stable/c/f85a58340b91f225de3299dfa782c6414098077c

How CyberStrike helps

Frequently asked questions

What is CVE-2026-74479?

CVE-2026-74479 is a high-severity vulnerability. It was published on August 15, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2026-74479?

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-74479?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-74479?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-74479 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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