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vuln-cve/data/2026/98xxx/CVE-2026-98581.json
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{
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"cveMetadata": {
"cveId": "CVE-2026-98581",
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"state": "PUBLISHED",
"assignerShortName": "Linux",
"dateReserved": "2026-09-25T10:25:14.358Z",
"datePublished": "2026-10-18T15:18:54.696Z",
"dateUpdated": "2026-10-19T09:22:07.016Z"
},
"containers": {
"cna": {
"providerMetadata": {
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux",
"dateUpdated": "2026-10-19T09:22:07.016Z"
},
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnfc: llcp: Fix list corruption / refcount desync in nfc_llcp_recv_dm()\n\nnfc_llcp_recv_dm() handles DM(NOBOUND)/DM(REJ) for a socket that is still\nlinked on local->connecting_sockets: it looks the socket up with\nnfc_llcp_connecting_sock_get(), sets sk->sk_state = LLCP_CLOSED and\nreturns, without taking the socket lock and without unlinking the socket\nfrom the connecting_sockets list.\n\nllcp_sock_release() selects the list to unlink from by sk_state: a socket\nin LLCP_CONNECTING is unlinked from connecting_sockets, otherwise from the\nsockets list. Because recv_dm left the socket physically on\nconnecting_sockets but in the LLCP_CLOSED state, release() takes the else\nbranch and calls nfc_llcp_sock_unlink(&local->sockets, sk). That runs\nsk_del_node_init() while holding sockets.lock, i.e. it removes the socket\nfrom the connecting_sockets hlist under the wrong lock. A concurrent\nconnect() linking another socket onto connecting_sockets under\nconnecting_sockets.lock then mutates the same hlist unserialized, which\ncorrupts the list and desyncs the sk_add_node()/sk_del_node_init()\nsock_hold()/__sock_put() pairing. An unprivileged local process holding\nLLCP sockets, with the DM supplied by the remote peer over an established\nLLCP link, can drive this to leak kernel sockets without bound (the\nmis-decrement goes through the non-freeing __sock_put() path, so the\nobject is never released), leading to memory exhaustion / DoS.\n\nThis is the same class of bug that was fixed in the sibling handler\nnfc_llcp_recv_cc() by commit b493ea2765cc (\"nfc: llcp: Fix use-after-free\nrace in nfc_llcp_recv_cc()\"); recv_dm did not receive the equivalent fix.\n\nFix it the same way: take lock_sock(), re-check that the socket is still\nhashed (release() may have won the race), and for the NOBOUND/REJ case\nunlink it from connecting_sockets before moving it to LLCP_CLOSED. The\nunlink drops the connecting_sockets membership reference via\nsk_del_node_init(), leaving the socket unhashed, so the later\nnfc_llcp_sock_unlink() in llcp_sock_release() becomes a no-op and no\ndouble put occurs."
}
],
"affected": [
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "unaffected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"net/nfc/llcp_core.c"
],
"versions": [
{
"version": "a69f32af86e389dd232b1bb2269e202c1bfcc60f",
"lessThan": "dd2d24add86b3b63cd87cf2feff98ae119ba19a6",
"status": "affected",
"versionType": "git"
},
{
"version": "a69f32af86e389dd232b1bb2269e202c1bfcc60f",
"lessThan": "812731dd8511f5768f4ff279b3c18d85cd21da4b",
"status": "affected",
"versionType": "git"
},
{
"version": "a69f32af86e389dd232b1bb2269e202c1bfcc60f",
"lessThan": "dba1d9c7134afcb4b1bfad8c1b1b3f0ab5189b08",
"status": "affected",
"versionType": "git"
},
{
"version": "a69f32af86e389dd232b1bb2269e202c1bfcc60f",
"lessThan": "c1e9ed52a6697354366dddf190fbacee8ed2f7c5",
"status": "affected",
"versionType": "git"
},
{
"version": "a69f32af86e389dd232b1bb2269e202c1bfcc60f",
"lessThan": "7fb2c0eeb79bfad64065f539a453138abd0edda6",
"status": "affected",
"versionType": "git"
},
{
"version": "a69f32af86e389dd232b1bb2269e202c1bfcc60f",
"lessThan": "b94cf09720543cc34256c7aa88f8059cbe7c0419",
"status": "affected",
"versionType": "git"
},
{
"version": "a69f32af86e389dd232b1bb2269e202c1bfcc60f",
"lessThan": "320a2ff49bdce3f9a437b9a9ff341ff27d3bdbf1",
"status": "affected",
"versionType": "git"
},
{
"version": "a69f32af86e389dd232b1bb2269e202c1bfcc60f",
"lessThan": "bf1460acdf8cf5a07c819f59785d40f20d113099",
"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/nfc/llcp_core.c"
],
"versions": [
{
"version": "3.6",
"status": "affected"
},
{
"version": "0",
"lessThan": "3.6",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "5.10.271",
"lessThanOrEqual": "5.10.*",
"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": "6.12.112",
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.18.55",
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "7.2.9",
"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": "3.6",
"versionEndExcluding": "5.10.271"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "3.6",
"versionEndExcluding": "5.15.222"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "3.6",
"versionEndExcluding": "6.1.189"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "3.6",
"versionEndExcluding": "6.6.158"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "3.6",
"versionEndExcluding": "6.12.112"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "3.6",
"versionEndExcluding": "6.18.55"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "3.6",
"versionEndExcluding": "7.2.9"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "3.6",
"versionEndExcluding": "7.3"
}
]
}
]
}
],
"references": [
{
"url": "https://git.kernel.org/stable/c/dd2d24add86b3b63cd87cf2feff98ae119ba19a6"
},
{
"url": "https://git.kernel.org/stable/c/812731dd8511f5768f4ff279b3c18d85cd21da4b"
},
{
"url": "https://git.kernel.org/stable/c/dba1d9c7134afcb4b1bfad8c1b1b3f0ab5189b08"
},
{
"url": "https://git.kernel.org/stable/c/c1e9ed52a6697354366dddf190fbacee8ed2f7c5"
},
{
"url": "https://git.kernel.org/stable/c/7fb2c0eeb79bfad64065f539a453138abd0edda6"
},
{
"url": "https://git.kernel.org/stable/c/b94cf09720543cc34256c7aa88f8059cbe7c0419"
},
{
"url": "https://git.kernel.org/stable/c/320a2ff49bdce3f9a437b9a9ff341ff27d3bdbf1"
},
{
"url": "https://git.kernel.org/stable/c/bf1460acdf8cf5a07c819f59785d40f20d113099"
}
],
"title": "nfc: llcp: Fix list corruption / refcount desync in nfc_llcp_recv_dm()",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
}
}
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