{ "schemaVersion": 1, "attribution": [ { "source": "CISA Known Exploited Vulnerabilities", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog", "licence": "US government work" }, { "source": "GitHub Advisory Database", "url": "https://github.com/advisories", "licence": "CC BY 4.0" }, { "source": "Have I Been Pwned", "url": "https://haveibeenpwned.com/", "licence": "CC BY 4.0" }, { "source": "CVE Program (CVE records)", "url": "https://www.cve.org/Legal/TermsOfUse", "licence": "CVE Terms of Use", "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.", "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy." }, { "source": "FIRST EPSS", "url": "https://www.first.org/epss/", "licence": "free to use; FIRST requests attribution" } ], "record": { "id": "CVE-2026-98581", "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2026-98581", "idYear": 2026, "status": "PUBLISHED", "publishedAt": "2026-10-18T15:18:54.696Z", "updatedAt": "2026-10-19T09:22:07.016Z", "importedAt": "2026-10-24T01:58:41.756Z", "snapshot": { "id": "cve_2026-10-24_midnight_baseline", "at": "2026-10-24T00:00:00.000Z", "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z" }, "facts": { "title": "nfc: llcp: Fix list corruption / refcount desync in nfc_llcp_recv_dm()", "summary": "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": [ { "vendor": "Linux", "product": "Linux", "defaultStatus": "unaffected", "versions": [ { "version": "a69f32af86e389dd232b1bb2269e202c1bfcc60f", "status": "affected", "versionType": "git", "lessThan": "dd2d24add86b3b63cd87cf2feff98ae119ba19a6" }, { "version": "a69f32af86e389dd232b1bb2269e202c1bfcc60f", "status": "affected", "versionType": "git", "lessThan": "812731dd8511f5768f4ff279b3c18d85cd21da4b" }, { "version": "a69f32af86e389dd232b1bb2269e202c1bfcc60f", "status": "affected", "versionType": "git", "lessThan": "dba1d9c7134afcb4b1bfad8c1b1b3f0ab5189b08" }, { "version": "a69f32af86e389dd232b1bb2269e202c1bfcc60f", "status": "affected", "versionType": "git", "lessThan": "c1e9ed52a6697354366dddf190fbacee8ed2f7c5" }, { "version": "a69f32af86e389dd232b1bb2269e202c1bfcc60f", "status": "affected", "versionType": "git", "lessThan": "7fb2c0eeb79bfad64065f539a453138abd0edda6" }, { "version": "a69f32af86e389dd232b1bb2269e202c1bfcc60f", "status": "affected", "versionType": "git", "lessThan": "b94cf09720543cc34256c7aa88f8059cbe7c0419" }, { "version": "a69f32af86e389dd232b1bb2269e202c1bfcc60f", "status": "affected", "versionType": "git", "lessThan": "320a2ff49bdce3f9a437b9a9ff341ff27d3bdbf1" }, { "version": "a69f32af86e389dd232b1bb2269e202c1bfcc60f", "status": "affected", "versionType": "git", "lessThan": "bf1460acdf8cf5a07c819f59785d40f20d113099" } ] }, { "vendor": "Linux", "product": "Linux", "defaultStatus": "affected", "versions": [ { "version": "3.6", "status": "affected" }, { "version": "0", "status": "unaffected", "versionType": "semver", "lessThan": "3.6" }, { "version": "5.10.271", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.10.*" }, { "version": "5.15.222", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.15.*" }, { "version": "6.1.189", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.1.*" }, { "version": "6.6.158", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.6.*" }, { "version": "6.12.112", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.12.*" }, { "version": "6.18.55", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.18.*" }, { "version": "7.2.9", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "7.2.*" }, { "version": "7.3", "status": "unaffected", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*" } ] } ] } } }