{"id":"CVE-2026-98555","title":"llc: fix skb UAF and leaks on llc_mac_hdr_init() failure","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nllc: fix skb UAF and leaks on llc_mac_hdr_init() failure\n\nIn llc_conn_ac_resend_i_xxx_x_set_0_or_send_rr(), if llc_mac_hdr_init()\nfails, kfree_skb(skb) is called instea…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < fec0fe6838a7f45175667701fb51abb23a6ffb1e","Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < b859ba18b5a1067f71db5618c6a4a70d55fa308b","Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 8b855b645841b5a04e20339a22bb6d593c9b790d","Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < d360b31f1a3666579422872aa7d1a751e20b76f9","Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 060f827aa3dc47939ee306da715cd6700d129616","Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 41dcae82bece9f106b4dff0ee777bba8d157c8a8","Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < cb3528ad8bb46fa6252f5d14ced7febddc18515d","Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 72f9dd522f8d6c5a00be9695c7bb74631eb5069e","Linux 2.6.12"],"published":"2026-10-18","updated":"2026-10-18","sourceUpdated":"2026-10-18T15:18:22.631Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-98555","references":[{"url":"https://git.kernel.org/stable/c/fec0fe6838a7f45175667701fb51abb23a6ffb1e"},{"url":"https://git.kernel.org/stable/c/b859ba18b5a1067f71db5618c6a4a70d55fa308b"},{"url":"https://git.kernel.org/stable/c/8b855b645841b5a04e20339a22bb6d593c9b790d"},{"url":"https://git.kernel.org/stable/c/d360b31f1a3666579422872aa7d1a751e20b76f9"},{"url":"https://git.kernel.org/stable/c/060f827aa3dc47939ee306da715cd6700d129616"},{"url":"https://git.kernel.org/stable/c/41dcae82bece9f106b4dff0ee777bba8d157c8a8"},{"url":"https://git.kernel.org/stable/c/cb3528ad8bb46fa6252f5d14ced7febddc18515d"},{"url":"https://git.kernel.org/stable/c/72f9dd522f8d6c5a00be9695c7bb74631eb5069e"}],"tags":["cve.org"],"ingestedAt":"2026-10-18T15:45:12.263Z","slug":"CVE-2026-98555","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nllc: fix skb UAF and leaks on llc_mac_hdr_init() failure\n\nIn llc_conn_ac_resend_i_xxx_x_set_0_or_send_rr(), if llc_mac_hdr_init()\nfails, kfree_skb(skb) is called instead of kfree_skb(nskb). This leaks\nthe newly allocated nskb, reads from the freed skb via LLC_I_GET_NR(pdu),\nand double-frees skb when llc_conn_state_process() drops its reference.\n\nIn llc_sap_action_send_xid_r() and llc_sap_action_send_test_r(), nskb is\nleaked if llc_mac_hdr_init() returns an error.\n\nFree nskb in all three error paths.\n\n## Affected\n\n- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < fec0fe6838a7f45175667701fb51abb23a6ffb1e`\n- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < b859ba18b5a1067f71db5618c6a4a70d55fa308b`\n- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 8b855b645841b5a04e20339a22bb6d593c9b790d`\n- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < d360b31f1a3666579422872aa7d1a751e20b76f9`\n- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 060f827aa3dc47939ee306da715cd6700d129616`\n- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 41dcae82bece9f106b4dff0ee777bba8d157c8a8`\n- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < cb3528ad8bb46fa6252f5d14ced7febddc18515d`\n- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 72f9dd522f8d6c5a00be9695c7bb74631eb5069e`\n- `Linux 2.6.12`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}