{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-90225", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-11T19:38:34.794Z", "datePublished": "2026-09-17T16:07:34.658Z", "dateUpdated": "2026-10-19T09:00:01.803Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T09:00:01.803Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnfc: llcp: read llcp_sock->local under the socket lock in getsockopt\n\nnfc_llcp_getsockopt() read llcp_sock->local before lock_sock(sk) and\nthen dereferenced the cached pointer inside the locked region.\nllcp_sock_bind() assigns and clears llcp_sock->local under the same\nsocket lock, dropping the last reference on its error path. A\ngetsockopt() racing an in-flight bind() can observe the pointer, block\non lock_sock(), and then dereference a freed nfc_llcp_local once bind()\nhas unwound.\n\nMove the llcp_sock->local read and the NULL check inside the\nlock_sock(sk) region so bind() cannot mutate or free the pointer between\nthe load and the use." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - The UAF is triggered by racing local syscalls on an AF_NFC LLCP socket: getsockopt(2) (__sys_getsockopt → do_sock_getsockopt → nfc_llcp_getsockopt) against bind(2) (__sys_bind → llcp_sock_bind). No LLCP PDU or other NFC-peer bytes are consumed on this path, so an adjacent radio peer cannot drive it.\nAC:L - The attacker owns both sides of the lock_sock(sk) race: one thread calls bind() with service_name_len 0 so nfc_llcp_get_sdp_ssap() returns LLCP_SAP_MAX after llcp_sock->local is stored, and another calls getsockopt(SOL_NFC, NFC_LLCP_RW) on the same socket, which used to snapshot that pointer before taking the lock.\nPR:L - llcp_sock_create() checks capable(CAP_NET_RAW) only for SOCK_RAW; nfc_llcp_getsockopt is on llcp_sock_ops for SOCK_STREAM/DGRAM. An unprivileged user in init_net can socket(AF_NFC, SOCK_STREAM, NFC_SOCKPROTO_LLCP) then bind/getsockopt. nfc_llcp_find_local() needs a registered NFC device, which is typical on phones.\nUI:N - The attacker creates the AF_NFC LLCP socket and issues bind() and getsockopt() on that fd themselves; no other user needs to tap a tag, mount media, or accept a connection.\nS:U - The freed object is the host kernel's kmalloc'd nfc_llcp_local used by nfc_llcp_getsockopt(); impact stays inside the kernel's security authority, not a VM, IOMMU, or sandbox escape.\nC:H - nfc_llcp_getsockopt() dereferences the dangling nfc_llcp_local to read local->rw, local->miux, local->remote_miu, and local->remote_lto and copies those values to userspace with put_user(), so reclaim of the freed slab yields an arbitrary-read primitive.\nI:H - llcp_sock_bind()'s sock_llcp_put_local path drops nfc_llcp_local via nfc_llcp_local_put() while nfc_llcp_getsockopt() still holds the pointer; reclaiming that kmalloc object with attacker-controlled data turns the dangling local into a write/control-flow primitive.\nA:H - Using the freed nfc_llcp_local in nfc_llcp_getsockopt() (the local->rw and local->remote_lto loads) is a kernel slab UAF that oopses or panics on KASAN/SLUB_DEBUG and can crash the system even when not fully exploited." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/nfc/llcp_sock.c" ], "versions": [ { "version": "26fd76cab2e61cedc5c25f7151fb31b57ddc53c7", "lessThan": "56fd158fef20268f48db6cdfe5d722e930134eda", "status": "affected", "versionType": "git" }, { "version": "26fd76cab2e61cedc5c25f7151fb31b57ddc53c7", "lessThan": "8ba8cec0586727cc135ca4827921fc7b52946d71", "status": "affected", "versionType": "git" }, { "version": "26fd76cab2e61cedc5c25f7151fb31b57ddc53c7", "lessThan": "ed5240bab3468988077fe8bf29b935eaecc9ff89", "status": "affected", "versionType": "git" }, { "version": "26fd76cab2e61cedc5c25f7151fb31b57ddc53c7", "lessThan": "fe65727a4a21b11c18eebae1338482767a897b76", "status": "affected", "versionType": "git" }, { "version": "26fd76cab2e61cedc5c25f7151fb31b57ddc53c7", "lessThan": "2d8ac24565be85bf56580b87bf1b874d35625eb5", "status": "affected", "versionType": "git" }, { "version": "26fd76cab2e61cedc5c25f7151fb31b57ddc53c7", "lessThan": "156e65bd29307f5053835bff60bc1ba342fa010f", "status": "affected", "versionType": "git" }, { "version": "26fd76cab2e61cedc5c25f7151fb31b57ddc53c7", "lessThan": "d1b73962675cdc5a58e2707e25b548d8b495fde0", "status": "affected", "versionType": "git" }, { "version": "26fd76cab2e61cedc5c25f7151fb31b57ddc53c7", "lessThan": "36812527052c5bfb1ec6c1e292d67a5bf76b750f", "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_sock.c" ], "versions": [ { "version": "3.10", "status": "affected" }, { "version": "0", "lessThan": "3.10", "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": "3.10", "versionEndExcluding": "5.10.270" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.10", "versionEndExcluding": "5.15.221" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.10", "versionEndExcluding": "6.1.188" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.10", "versionEndExcluding": "6.6.157" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.10", "versionEndExcluding": "6.12.110" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.10", "versionEndExcluding": "6.18.52" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.10", "versionEndExcluding": "7.2.6" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.10", "versionEndExcluding": "7.3" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/56fd158fef20268f48db6cdfe5d722e930134eda" }, { "url": "https://git.kernel.org/stable/c/8ba8cec0586727cc135ca4827921fc7b52946d71" }, { "url": "https://git.kernel.org/stable/c/ed5240bab3468988077fe8bf29b935eaecc9ff89" }, { "url": "https://git.kernel.org/stable/c/fe65727a4a21b11c18eebae1338482767a897b76" }, { "url": "https://git.kernel.org/stable/c/2d8ac24565be85bf56580b87bf1b874d35625eb5" }, { "url": "https://git.kernel.org/stable/c/156e65bd29307f5053835bff60bc1ba342fa010f" }, { "url": "https://git.kernel.org/stable/c/d1b73962675cdc5a58e2707e25b548d8b495fde0" }, { "url": "https://git.kernel.org/stable/c/36812527052c5bfb1ec6c1e292d67a5bf76b750f" } ], "title": "nfc: llcp: read llcp_sock->local under the socket lock in getsockopt", "x_generator": { "engine": "bippy-1.2.0" } } } }