{"id":"CVE-2026-97964","revision":"03ee2467fffa4e2984388676319a959c","records":[{"revision":"03ee2467fffa4e2984388676319a959c","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-97964","aliases":[],"title":"ppp_synctty: ensure a writeable skb header","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nppp_synctty: ensure a writeable skb header\n\nppp_sync_txmunge() checks headroom before prepending the address and\ncontrol bytes, but does not ensure that the skb header is writable.\nA received skb can reach this function through PPP channel bridging\nwithout passing through ppp_start_xmit(), which calls skb_cow_head().\n\nFor example, a PPPoE frame may share its buffer with a clone queued to\nan AF_PACKET socket. If it is bridged to a synchronous tty channel, the\naddress/control bytes can overwrite data still visible to that socket.\n\nUse skb_cow_head() to ensure both sufficient headroom and a writable\nheader.","state":0,"publishedAt":"2026-09-25T10:23:07.35+00:00","modifiedAt":"2026-10-19T09:11:30.152+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"drivers/net/ppp/ppp_synctty.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"4cf476ced45d7f12df30a68e833b263e7a2202d1\",\n                            \"lessThan\": \"25e03eeead2c49748c7582dfb64c205f93a42d00\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"4cf476ced45d7f12df30a68e833b263e7a2202d1\",\n                            \"lessThan\": \"a256f9925288ef47de8febed5c38d5cc21340211\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"4cf476ced45d7f12df30a68e833b263e7a2202d1\",\n                            \"lessThan\": \"7953946f68262a8bb137aa101249adef6e029652\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"4cf476ced45d7f12df30a68e833b263e7a2202d1\",\n                            \"lessThan\": \"3af7797fbabc84992e0ca5ad2bc0ca8537d053ef\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"4cf476ced45d7f12df30a68e833b263e7a2202d1\",\n                            \"lessThan\": \"0996c3e6bcc6ae08cb371ed43648c9f7f748ae6e\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"4cf476ced45d7f12df30a68e833b263e7a2202d1\",\n                            \"lessThan\": \"15d0a6c9a42df2d745c37510dba828f6dbe60d9f\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"4cf476ced45d7f12df30a68e833b263e7a2202d1\",\n                            \"lessThan\": \"8aaeb56aff2a557a88f83ae866da2c91ad247e59\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"drivers/net/ppp/ppp_synctty.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"5.11\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"5.11\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.15.222\",\n                            \"lessThanOrEqual\": \"5.15.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.189\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.158\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.111\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.53\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2.7\",\n                            \"lessThanOrEqual\": \"7.2.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.3\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[],"references":["https://git.kernel.org/stable/c/25e03eeead2c49748c7582dfb64c205f93a42d00","https://git.kernel.org/stable/c/a256f9925288ef47de8febed5c38d5cc21340211","https://git.kernel.org/stable/c/7953946f68262a8bb137aa101249adef6e029652","https://git.kernel.org/stable/c/3af7797fbabc84992e0ca5ad2bc0ca8537d053ef","https://git.kernel.org/stable/c/0996c3e6bcc6ae08cb371ed43648c9f7f748ae6e","https://git.kernel.org/stable/c/15d0a6c9a42df2d745c37510dba828f6dbe60d9f","https://git.kernel.org/stable/c/8aaeb56aff2a557a88f83ae866da2c91ad247e59"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-97964","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-97964","identifiers":["CVE-2026-97964"]},"retained":false,"historicalAffected":[]}],"coverage":[]}