Vulnerability in Linux

[ Description ]Official 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.

[ Fixes ]Fixes and patches

No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.

[ Advisories ]Government CERT advisories

• BSI CERT-Bund18 Oct 2026WID-SEC-2026-4019

  Linux Kernel: Multiple vulnerabilities Translated from German

  CVE-2026-98866CVE-2026-98624CVE-2026-98745+326 more CVEs

[ References ]References

• git.kernel.org/stable/c/060f827aa3dc47939ee306da715cd6700d129616
• git.kernel.org/stable/c/41dcae82bece9f106b4dff0ee777bba8d157c8a8
• git.kernel.org/stable/c/72f9dd522f8d6c5a00be9695c7bb74631eb5069e
• git.kernel.org/stable/c/8b855b645841b5a04e20339a22bb6d593c9b790d
• git.kernel.org/stable/c/b859ba18b5a1067f71db5618c6a4a70d55fa308b
• git.kernel.org/stable/c/cb3528ad8bb46fa6252f5d14ced7febddc18515d
• git.kernel.org/stable/c/d360b31f1a3666579422872aa7d1a751e20b76f9
• git.kernel.org/stable/c/fec0fe6838a7f45175667701fb51abb23a6ffb1e