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CVE-2026-98555

7.5 · HIGH

In the Linux kernel, the following vulnerability has been resolved: llc: fix skb UAF and leaks on llc_mac_hdr_init() failure In llc_conn_ac_resend_i_xxx_x_set_0_or_send_rr(), if llc_mac_hdr_init(…

Published Oct 18, 2026EPSS 0.31%

Overview

CVE-2026-98555 is a high-severity vulnerability. It was published on October 18, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

Technical description

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

llc: fix skb UAF and leaks on llc_mac_hdr_init() failure

In llc_conn_ac_resend_i_xxx_x_set_0_or_send_rr(), if llc_mac_hdr_init()

fails, kfree_skb(skb) is called instead of kfree_skb(nskb). This leaks

the newly allocated nskb, reads from the freed skb via LLC_I_GET_NR(pdu),

and double-frees skb when llc_conn_state_process() drops its reference.

In llc_sap_action_send_xid_r() and llc_sap_action_send_test_r(), nskb is

leaked if llc_mac_hdr_init() returns an error.

Free nskb in all three error paths.

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/060f827aa3dc47939ee306da715cd6700d129616Refgit.kernel.org/stable/c/41dcae82bece9f106b4dff0ee777bba8d157c8a8Refgit.kernel.org/stable/c/72f9dd522f8d6c5a00be9695c7bb74631eb5069eRefgit.kernel.org/stable/c/8b855b645841b5a04e20339a22bb6d593c9b790dRefgit.kernel.org/stable/c/b859ba18b5a1067f71db5618c6a4a70d55fa308bRefgit.kernel.org/stable/c/cb3528ad8bb46fa6252f5d14ced7febddc18515dRefgit.kernel.org/stable/c/d360b31f1a3666579422872aa7d1a751e20b76f9Refgit.kernel.org/stable/c/fec0fe6838a7f45175667701fb51abb23a6ffb1e

How CyberStrike helps

Frequently asked questions

What is CVE-2026-98555?

CVE-2026-98555 is a high-severity vulnerability. It was published on October 18, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).

How severe is CVE-2026-98555?

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-98555?

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-2026-98555?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-98555 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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