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vuln-cve/data/2026/45xxx/CVE-2026-45839.json
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{
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"cveMetadata": {
"cveId": "CVE-2026-45839",
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"state": "PUBLISHED",
"assignerShortName": "Linux",
"dateReserved": "2026-05-13T15:03:33.077Z",
"datePublished": "2026-05-27T09:24:37.855Z",
"dateUpdated": "2026-10-15T01:19:41.412Z"
},
"containers": {
"cna": {
"providerMetadata": {
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux",
"dateUpdated": "2026-08-27T12:39:38.923Z"
},
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: reject negative CO-RE accessor indices in bpf_core_parse_spec()\n\nCO-RE accessor strings are colon-separated indices that describe a path\nfrom a root BTF type to a target field, e.g. \"0:1:2\" walks through\nnested struct members. bpf_core_parse_spec() parses each component with\nsscanf(\"%d\"), so negative values like -1 are silently accepted. The\nsubsequent bounds checks (access_idx >= btf_vlen(t)) only guard the\nupper bound and always pass for negative values because C integer\npromotion converts the __u16 btf_vlen result to int, making the\ncomparison (int)(-1) >= (int)(N) false for any positive N.\n\nWhen -1 reaches btf_member_bit_offset() it gets cast to u32 0xffffffff,\nproducing an out-of-bounds read far past the members array. A crafted\nBPF program with a negative CO-RE accessor on any struct that exists in\nvmlinux BTF (e.g. task_struct) crashes the kernel deterministically\nduring BPF_PROG_LOAD on any system with CONFIG_DEBUG_INFO_BTF=y\n(default on major distributions). The bug is reachable with CAP_BPF:\n\n BUG: unable to handle page fault for address: ffffed11818b6626\n #PF: supervisor read access in kernel mode\n #PF: error_code(0x0000) - not-present page\n Oops: Oops: 0000 [#1] SMP KASAN NOPTI\n CPU: 0 UID: 0 PID: 85 Comm: poc Not tainted 7.0.0-rc6 #18 PREEMPT(full)\n RIP: 0010:bpf_core_parse_spec (tools/lib/bpf/relo_core.c:354)\n RAX: 00000000ffffffff\n Call Trace:\n <TASK>\n bpf_core_calc_relo_insn (tools/lib/bpf/relo_core.c:1321)\n bpf_core_apply (kernel/bpf/btf.c:9507)\n check_core_relo (kernel/bpf/verifier.c:19475)\n bpf_check (kernel/bpf/verifier.c:26031)\n bpf_prog_load (kernel/bpf/syscall.c:3089)\n __sys_bpf (kernel/bpf/syscall.c:6228)\n </TASK>\n\nCO-RE accessor indices are inherently non-negative (struct member index,\narray element index, or enumerator index), so reject them immediately\nafter parsing."
}
],
"affected": [
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "unaffected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"tools/lib/bpf/relo_core.c"
],
"versions": [
{
"version": "ddc7c3042614e273044f698d2beab25cc3842d45",
"lessThan": "c8e49b79c4b48bd687706ff6e9c82638dc81ef80",
"status": "affected",
"versionType": "git"
},
{
"version": "ddc7c3042614e273044f698d2beab25cc3842d45",
"lessThan": "a9e777f856cd2f1efc106afc7bf21aef868509d5",
"status": "affected",
"versionType": "git"
},
{
"version": "ddc7c3042614e273044f698d2beab25cc3842d45",
"lessThan": "669349b4612c26b3d7aacfa99d7174681bd19223",
"status": "affected",
"versionType": "git"
},
{
"version": "ddc7c3042614e273044f698d2beab25cc3842d45",
"lessThan": "3ff85ae79e1a74baeb916b78a63d821f6d19a994",
"status": "affected",
"versionType": "git"
},
{
"version": "ddc7c3042614e273044f698d2beab25cc3842d45",
"lessThan": "36a9012f76ba8d9189ae56a1f8bb7c87c07a1f3a",
"status": "affected",
"versionType": "git"
},
{
"version": "ddc7c3042614e273044f698d2beab25cc3842d45",
"lessThan": "76f2ebaf79a9ae6d0737b87f045fe769e425d78f",
"status": "affected",
"versionType": "git"
},
{
"version": "ddc7c3042614e273044f698d2beab25cc3842d45",
"lessThan": "99dbab7b5a12d8f58d5b0aa2f7a1fe656a70f4b2",
"status": "affected",
"versionType": "git"
},
{
"version": "ddc7c3042614e273044f698d2beab25cc3842d45",
"lessThan": "1c22483a2c4bbf747787f328392ca3e68619c4dc",
"status": "affected",
"versionType": "git"
}
]
},
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "affected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"tools/lib/bpf/relo_core.c"
],
"versions": [
{
"version": "5.4",
"status": "affected"
},
{
"version": "0",
"lessThan": "5.4",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "5.10.267",
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "5.15.209",
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.1.175",
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.6.141",
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.12.91",
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.18.33",
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "7.0.10",
"lessThanOrEqual": "7.0.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "7.1",
"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": "5.4",
"versionEndExcluding": "5.10.267"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "5.4",
"versionEndExcluding": "5.15.209"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "5.4",
"versionEndExcluding": "6.1.175"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "5.4",
"versionEndExcluding": "6.6.141"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "5.4",
"versionEndExcluding": "6.12.91"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "5.4",
"versionEndExcluding": "6.18.33"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "5.4",
"versionEndExcluding": "7.0.10"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "5.4",
"versionEndExcluding": "7.1"
}
]
}
]
}
],
"references": [
{
"url": "https://git.kernel.org/stable/c/c8e49b79c4b48bd687706ff6e9c82638dc81ef80"
},
{
"url": "https://git.kernel.org/stable/c/a9e777f856cd2f1efc106afc7bf21aef868509d5"
},
{
"url": "https://git.kernel.org/stable/c/669349b4612c26b3d7aacfa99d7174681bd19223"
},
{
"url": "https://git.kernel.org/stable/c/3ff85ae79e1a74baeb916b78a63d821f6d19a994"
},
{
"url": "https://git.kernel.org/stable/c/36a9012f76ba8d9189ae56a1f8bb7c87c07a1f3a"
},
{
"url": "https://git.kernel.org/stable/c/76f2ebaf79a9ae6d0737b87f045fe769e425d78f"
},
{
"url": "https://git.kernel.org/stable/c/99dbab7b5a12d8f58d5b0aa2f7a1fe656a70f4b2"
},
{
"url": "https://git.kernel.org/stable/c/1c22483a2c4bbf747787f328392ca3e68619c4dc"
}
],
"title": "bpf: reject negative CO-RE accessor indices in bpf_core_parse_spec()",
"x_generator": {
"engine": "bippy-1.2.0"
}
},
"adp": [
{
"x_adpType": "supplier",
"providerMetadata": {
"orgId": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e",
"shortName": "siemens-SADP",
"dateUpdated": "2026-10-15T01:19:41.412Z"
},
"affected": [
{
"vendor": "Siemens",
"product": "SIMATIC S7-1500 TM MFP - GNU/Linux subsystem",
"versions": [
{
"status": "affected",
"version": "0",
"lessThan": "*",
"versionType": "custom"
}
],
"defaultStatus": "unknown"
}
],
"references": [
{
"url": "https://cert-portal.siemens.com/productcert/html/ssa-784472.html"
}
]
}
]
}
}
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