{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-97964",
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "state": "PUBLISHED",
        "assignerShortName": "Linux",
        "dateReserved": "2026-09-25T10:18:58.206Z",
        "datePublished": "2026-09-25T10:23:07.350Z",
        "dateUpdated": "2026-10-19T09:11:30.152Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
                "shortName": "Linux",
                "dateUpdated": "2026-10-19T09:11:30.152Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "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."
                }
            ],
            "affected": [
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "drivers/net/ppp/ppp_synctty.c"
                    ],
                    "versions": [
                        {
                            "version": "4cf476ced45d7f12df30a68e833b263e7a2202d1",
                            "lessThan": "25e03eeead2c49748c7582dfb64c205f93a42d00",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "4cf476ced45d7f12df30a68e833b263e7a2202d1",
                            "lessThan": "a256f9925288ef47de8febed5c38d5cc21340211",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "4cf476ced45d7f12df30a68e833b263e7a2202d1",
                            "lessThan": "7953946f68262a8bb137aa101249adef6e029652",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "4cf476ced45d7f12df30a68e833b263e7a2202d1",
                            "lessThan": "3af7797fbabc84992e0ca5ad2bc0ca8537d053ef",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "4cf476ced45d7f12df30a68e833b263e7a2202d1",
                            "lessThan": "0996c3e6bcc6ae08cb371ed43648c9f7f748ae6e",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "4cf476ced45d7f12df30a68e833b263e7a2202d1",
                            "lessThan": "15d0a6c9a42df2d745c37510dba828f6dbe60d9f",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "4cf476ced45d7f12df30a68e833b263e7a2202d1",
                            "lessThan": "8aaeb56aff2a557a88f83ae866da2c91ad247e59",
                            "status": "affected",
                            "versionType": "git"
                        }
                    ]
                },
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "affected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "drivers/net/ppp/ppp_synctty.c"
                    ],
                    "versions": [
                        {
                            "version": "5.11",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "5.11",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "5.15.222",
                            "lessThanOrEqual": "5.15.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.1.189",
                            "lessThanOrEqual": "6.1.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.6.158",
                            "lessThanOrEqual": "6.6.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.12.111",
                            "lessThanOrEqual": "6.12.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.18.53",
                            "lessThanOrEqual": "6.18.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.2.7",
                            "lessThanOrEqual": "7.2.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.3",
                            "lessThanOrEqual": "*",
                            "status": "unaffected",
                            "versionType": "original_commit_for_fix"
                        }
                    ]
                }
            ],
            "cpeApplicability": [
                {
                    "nodes": [
                        {
                            "operator": "OR",
                            "negate": false,
                            "cpeMatch": [
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "5.11",
                                    "versionEndExcluding": "5.15.222"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "5.11",
                                    "versionEndExcluding": "6.1.189"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "5.11",
                                    "versionEndExcluding": "6.6.158"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "5.11",
                                    "versionEndExcluding": "6.12.111"
                                },
                                {
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                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "5.11",
                                    "versionEndExcluding": "6.18.53"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "5.11",
                                    "versionEndExcluding": "7.2.7"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "5.11",
                                    "versionEndExcluding": "7.3"
                                }
                            ]
                        }
                    ]
                }
            ],
            "references": [
                {
                    "url": "https://git.kernel.org/stable/c/25e03eeead2c49748c7582dfb64c205f93a42d00"
                },
                {
                    "url": "https://git.kernel.org/stable/c/a256f9925288ef47de8febed5c38d5cc21340211"
                },
                {
                    "url": "https://git.kernel.org/stable/c/7953946f68262a8bb137aa101249adef6e029652"
                },
                {
                    "url": "https://git.kernel.org/stable/c/3af7797fbabc84992e0ca5ad2bc0ca8537d053ef"
                },
                {
                    "url": "https://git.kernel.org/stable/c/0996c3e6bcc6ae08cb371ed43648c9f7f748ae6e"
                },
                {
                    "url": "https://git.kernel.org/stable/c/15d0a6c9a42df2d745c37510dba828f6dbe60d9f"
                },
                {
                    "url": "https://git.kernel.org/stable/c/8aaeb56aff2a557a88f83ae866da2c91ad247e59"
                }
            ],
            "title": "ppp_synctty: ensure a writeable skb header",
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    }
}