{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2022-50747", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-12-24T13:02:21.544Z", "datePublished": "2025-12-24T13:05:43.347Z", "dateUpdated": "2026-08-05T08:59:36.990Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T08:59:36.990Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nhfs: Fix OOB Write in hfs_asc2mac\n\nSyzbot reported a OOB Write bug:\n\nloop0: detected capacity change from 0 to 64\n==================================================================\nBUG: KASAN: slab-out-of-bounds in hfs_asc2mac+0x467/0x9a0\nfs/hfs/trans.c:133\nWrite of size 1 at addr ffff88801848314e by task syz-executor391/3632\n\nCall Trace:\n \n __dump_stack lib/dump_stack.c:88 [inline]\n dump_stack_lvl+0x1b1/0x28e lib/dump_stack.c:106\n print_address_description+0x74/0x340 mm/kasan/report.c:284\n print_report+0x107/0x1f0 mm/kasan/report.c:395\n kasan_report+0xcd/0x100 mm/kasan/report.c:495\n hfs_asc2mac+0x467/0x9a0 fs/hfs/trans.c:133\n hfs_cat_build_key+0x92/0x170 fs/hfs/catalog.c:28\n hfs_lookup+0x1ab/0x2c0 fs/hfs/dir.c:31\n lookup_open fs/namei.c:3391 [inline]\n open_last_lookups fs/namei.c:3481 [inline]\n path_openat+0x10e6/0x2df0 fs/namei.c:3710\n do_filp_open+0x264/0x4f0 fs/namei.c:3740\n\nIf in->len is much larger than HFS_NAMELEN(31) which is the maximum\nlength of an HFS filename, a OOB write could occur in hfs_asc2mac(). In\nthat case, when the dst reaches the boundary, the srclen is still\ngreater than 0, which causes a OOB write.\nFix this by adding a check on dstlen in while() before writing to dst\naddress." } ], "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 OOB write is reached via local VFS path lookup on a mounted HFS volume (openat → path_openat → hfs_lookup → hfs_cat_build_key → hfs_asc2mac). HFS has FS_REQUIRES_DEV and no network-facing parser; loop/UDisks mount keeps this Local rather than Physical.\nAC:L - An attacker who can open/creat/rename a pathname longer than HFS_NAMELEN (31) on an HFS mount with iocharset set (nls_io non-NULL, as in the syzbot repro with iocharset=macturkish) deterministically overflows the destination buffer with no race or attacker-uncontrollable condition.\nPR:L - HFS lacks FS_USERNS_MOUNT so raw mount needs CAP_SYS_ADMIN, but UDisks/polkit lets an unprivileged desktop/kiosk user mount removable or loop-backed HFS media, and any local user who can access an already-mounted HFS volume can trigger the bug via ordinary open/lookup.\nUI:N - The attacking local user can mount their own HFS image (with iocharset) via UDisks or use an existing mount and issue open/lookup with a long name themselves; no separate victim action is required.\nS:U - The slab out-of-bounds write corrupts host kernel heap within the same OS security authority; this is ordinary same-host kernel impact, not a VM/IOMMU/sandbox boundary cross.\nC:H - This is a slab out-of-bounds write of attacker-controlled pathname bytes past the 31-byte hfs_name into the kmalloc'd search_key (and beyond the ~78-byte allocation into adjacent slab objects), which is leverageable for information disclosure via heap corruption.\nI:H - The fixed path is an out-of-bounds write (CWE-787) of up to hundreds of attacker-controlled bytes past HFS_NAMELEN during NLS conversion, enabling heap shaping for arbitrary write/control-flow hijack primitives.\nA:H - The slab-out-of-bounds write is a memory-safety violation that reproducibly trips KASAN and can oops/panic under hardened allocators or by corrupting adjacent heap state, fully denying availability." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/hfs/trans.c" ], "versions": [ { "version": "328b9227865026268261a24a97a578907b280415", "lessThan": "8399318b13dc9e0569dee07ba2994098926d4fb2", "status": "affected", "versionType": "git" }, { "version": "328b9227865026268261a24a97a578907b280415", "lessThan": "95040de81c629cd8d3c6ab5b50a8bd5088068303", "status": "affected", "versionType": "git" }, { "version": "328b9227865026268261a24a97a578907b280415", "lessThan": "ba8f0ca386dd15acf5a93cbac932392c7818eab4", "status": "affected", "versionType": "git" }, { "version": "328b9227865026268261a24a97a578907b280415", "lessThan": "6a95b17e4d4cd2d8278559f930b447f8c9c8cff9", "status": "affected", "versionType": "git" }, { "version": "328b9227865026268261a24a97a578907b280415", "lessThan": "cff9fefdfbf5744afbb6d70bff2b49ec2065d23d", "status": "affected", "versionType": "git" }, { "version": "328b9227865026268261a24a97a578907b280415", "lessThan": "7af9cb8cbb81308ce4b06cc7164267faccbf75dd", "status": "affected", "versionType": "git" }, { "version": "328b9227865026268261a24a97a578907b280415", "lessThan": "ae21b03f904736eb2aa9bd119d2a14e741f1681f", "status": "affected", "versionType": "git" }, { "version": "328b9227865026268261a24a97a578907b280415", "lessThan": "88579c158e026860c61c4192531e8bc42f4bc642", "status": "affected", "versionType": "git" }, { "version": "328b9227865026268261a24a97a578907b280415", "lessThan": "c53ed55cb275344086e32a7080a6b19cb183650b", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/hfs/trans.c" ], "versions": [ { "version": "2.6.14", "status": "affected" }, { "version": "0", "lessThan": "2.6.14", "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": "2.6.14", "versionEndExcluding": "4.9.337" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.14", "versionEndExcluding": "4.14.303" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.14", "versionEndExcluding": "4.19.270" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.14", "versionEndExcluding": "5.4.229" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.14", "versionEndExcluding": "5.10.163" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.14", "versionEndExcluding": "5.15.86" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.14", "versionEndExcluding": "6.0.16" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.14", "versionEndExcluding": "6.1.2" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.14", "versionEndExcluding": "6.2" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/8399318b13dc9e0569dee07ba2994098926d4fb2" }, { "url": "https://git.kernel.org/stable/c/95040de81c629cd8d3c6ab5b50a8bd5088068303" }, { "url": "https://git.kernel.org/stable/c/ba8f0ca386dd15acf5a93cbac932392c7818eab4" }, { "url": "https://git.kernel.org/stable/c/6a95b17e4d4cd2d8278559f930b447f8c9c8cff9" }, { "url": "https://git.kernel.org/stable/c/cff9fefdfbf5744afbb6d70bff2b49ec2065d23d" }, { "url": "https://git.kernel.org/stable/c/7af9cb8cbb81308ce4b06cc7164267faccbf75dd" }, { "url": "https://git.kernel.org/stable/c/ae21b03f904736eb2aa9bd119d2a14e741f1681f" }, { "url": "https://git.kernel.org/stable/c/88579c158e026860c61c4192531e8bc42f4bc642" }, { "url": "https://git.kernel.org/stable/c/c53ed55cb275344086e32a7080a6b19cb183650b" } ], "title": "hfs: Fix OOB Write in hfs_asc2mac", "x_generator": { "engine": "bippy-1.2.0" } } } }