{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2022-50656", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-12-08T23:57:43.372Z", "datePublished": "2025-12-09T00:00:31.691Z", "dateUpdated": "2026-08-05T08:59:15.998Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T08:59:15.998Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnfc: pn533: Clear nfc_target before being used\n\nFix a slab-out-of-bounds read that occurs in nla_put() called from\nnfc_genl_send_target() when target->sensb_res_len, which is duplicated\nfrom an nfc_target in pn533, is too large as the nfc_target is not\nproperly initialized and retains garbage values. Clear nfc_targets with\nmemset() before they are used.\n\nFound by a modified version of syzkaller.\n\nBUG: KASAN: slab-out-of-bounds in nla_put\nCall Trace:\n memcpy\n nla_put\n nfc_genl_dump_targets\n genl_lock_dumpit\n netlink_dump\n __netlink_dump_start\n genl_family_rcv_msg_dumpit\n genl_rcv_msg\n netlink_rcv_skb\n genl_rcv\n netlink_unicast\n netlink_sendmsg\n sock_sendmsg\n ____sys_sendmsg\n ___sys_sendmsg\n __sys_sendmsg\n do_syscall_64" } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H", "baseScore": 8.1, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:A - The bug is triggered when a PN533 reader completes NFC-DEP JumpDep against a peer in RF range (poll_dep or dep_link_up), so exploitation is via the NFC adjacent segment, consistent with other NFC/Bluetooth protocol bugs.\nAC:L - Once the reader is polling for NFC-DEP, a peer that successfully answers JumpDep reliably creates the poisoned target and a subsequent target dump reliably exercises the OOB read; no attacker-uncontrollable race or rare config is required.\nPR:N - An adjacent NFC peer needs no host credentials; START_POLL/DEV_UP are performed by the system's NFC stack, while NFC_CMD_GET_TARGET itself has no GENL_ADMIN_PERM, so the attacker requires no privileges.\nUI:N - No victim user action is required beyond normal NFC operation; a polling reader plus an in-range DEP peer and an automatic or local target dump are sufficient.\nS:U - Impact is confined to the host kernel's memory confidentiality and availability; there is no VM escape, IOMMU bypass, or other cross-authority boundary crossing.\nC:H - Garbage sensb_res_len/sensf_res_len/nfcid2_len (u8, up to 255) drive nla_put() to copy far past the 76-byte kmemdup'd nfc_target into adjacent slab memory and return it to userspace over netlink, enabling a substantial kernel heap info leak.\nI:N - The defect is an out-of-bounds read during netlink serialization only; lengths are never used for writes, so there is no memory corruption write primitive or integrity impact.\nA:H - A large slab OOB read past the allocated nfc_target can touch unmapped memory beyond the slab object/page and cause a kernel oops, matching KASAN's slab-out-of-bounds report on the dump path." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/nfc/pn533/pn533.c" ], "versions": [ { "version": "361f3cb7f9cfdb82c80926d0e7843c098c034545", "lessThan": "9da4a0411f3455e3885831d0758bee3e3d565bbc", "status": "affected", "versionType": "git" }, { "version": "361f3cb7f9cfdb82c80926d0e7843c098c034545", "lessThan": "61a7e15d55fae329a245535c3bac494e401005b8", "status": "affected", "versionType": "git" }, { "version": "361f3cb7f9cfdb82c80926d0e7843c098c034545", "lessThan": "bef2f478513e7367ef3b05441f6afca981de29be", "status": "affected", "versionType": "git" }, { "version": "361f3cb7f9cfdb82c80926d0e7843c098c034545", "lessThan": "8bddef54cbe9ede5ac7478f1e1e968fcfe7e6f03", "status": "affected", "versionType": "git" }, { "version": "361f3cb7f9cfdb82c80926d0e7843c098c034545", "lessThan": "aea9e64dec2cc6cd742e07ecd4e6236fc76b389b", "status": "affected", "versionType": "git" }, { "version": "361f3cb7f9cfdb82c80926d0e7843c098c034545", "lessThan": "aae9c24ebd901f482e6c88b6f9e0c80dc5b536d6", "status": "affected", "versionType": "git" }, { "version": "361f3cb7f9cfdb82c80926d0e7843c098c034545", "lessThan": "755019e37815a66bb0a23893debbd3dd640ccbd3", "status": "affected", "versionType": "git" }, { "version": "361f3cb7f9cfdb82c80926d0e7843c098c034545", "lessThan": "e491285b4d08884b622638be8e4961eb43b0af64", "status": "affected", "versionType": "git" }, { "version": "361f3cb7f9cfdb82c80926d0e7843c098c034545", "lessThan": "9f28157778ede0d4f183f7ab3b46995bb400abbe", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/nfc/pn533/pn533.c" ], "versions": [ { "version": "3.3", "status": "affected" }, { "version": "0", "lessThan": "3.3", "status": "unaffected", "versionType": "semver" }, { "version": "4.9.337", "lessThanOrEqual": "4.9.*", "status": "unaffected", "versionType": "semver" }, { "version": "4.14.303", "lessThanOrEqual": "4.14.*", "status": "unaffected", "versionType": "semver" }, { "version": "4.19.270", "lessThanOrEqual": "4.19.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.4.229", "lessThanOrEqual": "5.4.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.163", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.86", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.0.16", "lessThanOrEqual": "6.0.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.2", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.2", "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": "3.3", "versionEndExcluding": "4.9.337" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.3", "versionEndExcluding": "4.14.303" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.3", "versionEndExcluding": "4.19.270" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.3", "versionEndExcluding": "5.4.229" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.3", "versionEndExcluding": "5.10.163" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.3", "versionEndExcluding": "5.15.86" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.3", "versionEndExcluding": "6.0.16" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.3", "versionEndExcluding": "6.1.2" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.3", "versionEndExcluding": "6.2" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/9da4a0411f3455e3885831d0758bee3e3d565bbc" }, { "url": "https://git.kernel.org/stable/c/61a7e15d55fae329a245535c3bac494e401005b8" }, { "url": "https://git.kernel.org/stable/c/bef2f478513e7367ef3b05441f6afca981de29be" }, { "url": "https://git.kernel.org/stable/c/8bddef54cbe9ede5ac7478f1e1e968fcfe7e6f03" }, { "url": "https://git.kernel.org/stable/c/aea9e64dec2cc6cd742e07ecd4e6236fc76b389b" }, { "url": "https://git.kernel.org/stable/c/aae9c24ebd901f482e6c88b6f9e0c80dc5b536d6" }, { "url": "https://git.kernel.org/stable/c/755019e37815a66bb0a23893debbd3dd640ccbd3" }, { "url": "https://git.kernel.org/stable/c/e491285b4d08884b622638be8e4961eb43b0af64" }, { "url": "https://git.kernel.org/stable/c/9f28157778ede0d4f183f7ab3b46995bb400abbe" } ], "title": "nfc: pn533: Clear nfc_target before being used", "x_generator": { "engine": "bippy-1.2.0" } } } }