{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-90160",
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "state": "PUBLISHED",
        "assignerShortName": "Linux",
        "dateReserved": "2026-09-11T19:38:34.790Z",
        "datePublished": "2026-09-17T16:06:51.806Z",
        "dateUpdated": "2026-10-19T08:58:58.842Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
                "shortName": "Linux",
                "dateUpdated": "2026-10-19T08:58:58.842Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nlwt_bpf: Restore reserved headroom after xmit program\n\nip_finish_output2() expands an skb to LL_RESERVED_SPACE(dev) before LWT\nxmit. An LWT_XMIT BPF program can then modify the skb head and still\nreturn BPF_OK, so bpf_xmit() rechecks the remaining headroom before the\nskb continues to neighbour output.\n\nThat recheck uses dst->dev->hard_header_len. This is not enough for the\nneighbour cached-header path: neigh_hh_output() copies the cached hardware\nheader using the aligned hh_cache size, HH_DATA_MOD for short headers or\nHH_DATA_ALIGN(hh_len) otherwise.\n\nOn Ethernet, hard_header_len is 14 but the cached copy needs 16 bytes. If\nan LWT_XMIT BPF program calls bpf_skb_change_head(skb, 1, 0), the skb can\nstill have 15 bytes of headroom after the program. The existing check\naccepts that, after which neigh_hh_output() hits its headroom warning and\ndrops the skb.\n\nUse LL_RESERVED_SPACE(dst->dev) in the post-BPF headroom check to match\nthe reservation made before LWT xmit."
                }
            ],
            "affected": [
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "net/core/lwt_bpf.c"
                    ],
                    "versions": [
                        {
                            "version": "3a0af8fd61f90920f6fa04e4f1e9a6a73c1b4fd2",
                            "lessThan": "753e5cdcca5474d230d62bb3489e5168ab27c272",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "3a0af8fd61f90920f6fa04e4f1e9a6a73c1b4fd2",
                            "lessThan": "c488071c3441fa34f5a87cd6c12ce2cc6304f20e",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "3a0af8fd61f90920f6fa04e4f1e9a6a73c1b4fd2",
                            "lessThan": "a38c0eb447e2dd0120a2ebcdba470f9505ac8907",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "3a0af8fd61f90920f6fa04e4f1e9a6a73c1b4fd2",
                            "lessThan": "de2b2004e16f2930eb689175e2c1998b0a68d499",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "3a0af8fd61f90920f6fa04e4f1e9a6a73c1b4fd2",
                            "lessThan": "7d043e24520a273c362be5dd7d9c82796879a49b",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "3a0af8fd61f90920f6fa04e4f1e9a6a73c1b4fd2",
                            "lessThan": "7cf561843ed0ad57501892a65abb77957e6c800f",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "3a0af8fd61f90920f6fa04e4f1e9a6a73c1b4fd2",
                            "lessThan": "179a5b2171573d94a25c9aa8e1c9f9ac352ad316",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "3a0af8fd61f90920f6fa04e4f1e9a6a73c1b4fd2",
                            "lessThan": "5fe7007aed9ad069b2bd77e5d0c875c64f5c0269",
                            "status": "affected",
                            "versionType": "git"
                        }
                    ]
                },
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "affected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "net/core/lwt_bpf.c"
                    ],
                    "versions": [
                        {
                            "version": "4.10",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "4.10",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "5.10.270",
                            "lessThanOrEqual": "5.10.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "5.15.221",
                            "lessThanOrEqual": "5.15.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.1.188",
                            "lessThanOrEqual": "6.1.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.6.157",
                            "lessThanOrEqual": "6.6.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.12.110",
                            "lessThanOrEqual": "6.12.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.18.52",
                            "lessThanOrEqual": "6.18.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.2.6",
                            "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": "4.10",
                                    "versionEndExcluding": "5.10.270"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "4.10",
                                    "versionEndExcluding": "5.15.221"
                                },
                                {
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                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "4.10",
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                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "4.10",
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                                },
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                                    "versionStartIncluding": "4.10",
                                    "versionEndExcluding": "6.12.110"
                                },
                                {
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                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "4.10",
                                    "versionEndExcluding": "7.2.6"
                                },
                                {
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                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "4.10",
                                    "versionEndExcluding": "7.3"
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            ],
            "references": [
                {
                    "url": "https://git.kernel.org/stable/c/753e5cdcca5474d230d62bb3489e5168ab27c272"
                },
                {
                    "url": "https://git.kernel.org/stable/c/c488071c3441fa34f5a87cd6c12ce2cc6304f20e"
                },
                {
                    "url": "https://git.kernel.org/stable/c/a38c0eb447e2dd0120a2ebcdba470f9505ac8907"
                },
                {
                    "url": "https://git.kernel.org/stable/c/de2b2004e16f2930eb689175e2c1998b0a68d499"
                },
                {
                    "url": "https://git.kernel.org/stable/c/7d043e24520a273c362be5dd7d9c82796879a49b"
                },
                {
                    "url": "https://git.kernel.org/stable/c/7cf561843ed0ad57501892a65abb77957e6c800f"
                },
                {
                    "url": "https://git.kernel.org/stable/c/179a5b2171573d94a25c9aa8e1c9f9ac352ad316"
                },
                {
                    "url": "https://git.kernel.org/stable/c/5fe7007aed9ad069b2bd77e5d0c875c64f5c0269"
                }
            ],
            "title": "lwt_bpf: Restore reserved headroom after xmit program",
            "x_generator": {
                "engine": "bippy-1.2.0"
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        }
    }
}