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CVE-2022-50747 (GCVE-0-2022-50747)

Vulnerability from cvelistv5 – Published: 2025-12-24 13:05 – Updated: 2026-08-05 08:59
VLAI
Title
hfs: Fix OOB Write in hfs_asc2mac
Summary
In the Linux kernel, the following vulnerability has been resolved: hfs: Fix OOB Write in hfs_asc2mac Syzbot reported a OOB Write bug: loop0: detected capacity change from 0 to 64 ================================================================== BUG: KASAN: slab-out-of-bounds in hfs_asc2mac+0x467/0x9a0 fs/hfs/trans.c:133 Write of size 1 at addr ffff88801848314e by task syz-executor391/3632 Call Trace: <TASK> __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1b1/0x28e lib/dump_stack.c:106 print_address_description+0x74/0x340 mm/kasan/report.c:284 print_report+0x107/0x1f0 mm/kasan/report.c:395 kasan_report+0xcd/0x100 mm/kasan/report.c:495 hfs_asc2mac+0x467/0x9a0 fs/hfs/trans.c:133 hfs_cat_build_key+0x92/0x170 fs/hfs/catalog.c:28 hfs_lookup+0x1ab/0x2c0 fs/hfs/dir.c:31 lookup_open fs/namei.c:3391 [inline] open_last_lookups fs/namei.c:3481 [inline] path_openat+0x10e6/0x2df0 fs/namei.c:3710 do_filp_open+0x264/0x4f0 fs/namei.c:3740 If in->len is much larger than HFS_NAMELEN(31) which is the maximum length of an HFS filename, a OOB write could occur in hfs_asc2mac(). In that case, when the dst reaches the boundary, the srclen is still greater than 0, which causes a OOB write. Fix this by adding a check on dstlen in while() before writing to dst address.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 328b9227865026268261a24a97a578907b280415 , < 8399318b13dc9e0569dee07ba2994098926d4fb2 (git)
Affected: 328b9227865026268261a24a97a578907b280415 , < 95040de81c629cd8d3c6ab5b50a8bd5088068303 (git)
Affected: 328b9227865026268261a24a97a578907b280415 , < ba8f0ca386dd15acf5a93cbac932392c7818eab4 (git)
Affected: 328b9227865026268261a24a97a578907b280415 , < 6a95b17e4d4cd2d8278559f930b447f8c9c8cff9 (git)
Affected: 328b9227865026268261a24a97a578907b280415 , < cff9fefdfbf5744afbb6d70bff2b49ec2065d23d (git)
Affected: 328b9227865026268261a24a97a578907b280415 , < 7af9cb8cbb81308ce4b06cc7164267faccbf75dd (git)
Affected: 328b9227865026268261a24a97a578907b280415 , < ae21b03f904736eb2aa9bd119d2a14e741f1681f (git)
Affected: 328b9227865026268261a24a97a578907b280415 , < 88579c158e026860c61c4192531e8bc42f4bc642 (git)
Affected: 328b9227865026268261a24a97a578907b280415 , < c53ed55cb275344086e32a7080a6b19cb183650b (git)
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Linux Linux Affected: 2.6.14
Unaffected: 0 , < 2.6.14 (semver)
Unaffected: 4.9.337 , ≤ 4.9.* (semver)
Unaffected: 4.14.303 , ≤ 4.14.* (semver)
Unaffected: 4.19.270 , ≤ 4.19.* (semver)
Unaffected: 5.4.229 , ≤ 5.4.* (semver)
Unaffected: 5.10.163 , ≤ 5.10.* (semver)
Unaffected: 5.15.86 , ≤ 5.15.* (semver)
Unaffected: 6.0.16 , ≤ 6.0.* (semver)
Unaffected: 6.1.2 , ≤ 6.1.* (semver)
Unaffected: 6.2 , ≤ * (original_commit_for_fix)
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          "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 \u003cTASK\u003e\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-\u003elen 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."
        }
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            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
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              "value": "AV:L - The OOB write is reached via local VFS path lookup on a mounted HFS volume (openat \u2192 path_openat \u2192 hfs_lookup \u2192 hfs_cat_build_key \u2192 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\u0027d 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."
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        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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      "references": [
        {
          "url": "https://git.kernel.org/stable/c/8399318b13dc9e0569dee07ba2994098926d4fb2"
        },
        {
          "url": "https://git.kernel.org/stable/c/95040de81c629cd8d3c6ab5b50a8bd5088068303"
        },
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          "url": "https://git.kernel.org/stable/c/ba8f0ca386dd15acf5a93cbac932392c7818eab4"
        },
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        {
          "url": "https://git.kernel.org/stable/c/c53ed55cb275344086e32a7080a6b19cb183650b"
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      ],
      "title": "hfs: Fix OOB Write in hfs_asc2mac",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2022-50747",
    "datePublished": "2025-12-24T13:05:43.347Z",
    "dateReserved": "2025-12-24T13:02:21.544Z",
    "dateUpdated": "2026-08-05T08:59:36.990Z",
    "state": "PUBLISHED"
  },
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  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2022-50747",
      "date": "2026-09-16",
      "epss": "0.00206",
      "percentile": "0.10926"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2022-50747\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-12-24T13:16:01.410\",\"lastModified\":\"2026-08-04T10:18:22.967\",\"vulnStatus\":\"Deferred\",\"cveTags\":[],\"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 \u003cTASK\u003e\\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-\u003elen 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.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"fs/hfs/trans.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"328b9227865026268261a24a97a578907b280415\",\"lessThan\":\"8399318b13dc9e0569dee07ba2994098926d4fb2\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"328b9227865026268261a24a97a578907b280415\",\"lessThan\":\"95040de81c629cd8d3c6ab5b50a8bd5088068303\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"328b9227865026268261a24a97a578907b280415\",\"lessThan\":\"ba8f0ca386dd15acf5a93cbac932392c7818eab4\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"328b9227865026268261a24a97a578907b280415\",\"lessThan\":\"6a95b17e4d4cd2d8278559f930b447f8c9c8cff9\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"328b9227865026268261a24a97a578907b280415\",\"lessThan\":\"cff9fefdfbf5744afbb6d70bff2b49ec2065d23d\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"328b9227865026268261a24a97a578907b280415\",\"lessThan\":\"7af9cb8cbb81308ce4b06cc7164267faccbf75dd\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"328b9227865026268261a24a97a578907b280415\",\"lessThan\":\"ae21b03f904736eb2aa9bd119d2a14e741f1681f\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"328b9227865026268261a24a97a578907b280415\",\"lessThan\":\"88579c158e026860c61c4192531e8bc42f4bc642\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"328b9227865026268261a24a97a578907b280415\",\"lessThan\":\"c53ed55cb275344086e32a7080a6b19cb183650b\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"fs/hfs/trans.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"2.6.14\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"2.6.14\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"4.9.337\",\"lessThanOrEqual\":\"4.9.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"4.14.303\",\"lessThanOrEqual\":\"4.14.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"4.19.270\",\"lessThanOrEqual\":\"4.19.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.4.229\",\"lessThanOrEqual\":\"5.4.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.163\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.86\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.0.16\",\"lessThanOrEqual\":\"6.0.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.2\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.2\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"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\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/6a95b17e4d4cd2d8278559f930b447f8c9c8cff9\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/7af9cb8cbb81308ce4b06cc7164267faccbf75dd\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/8399318b13dc9e0569dee07ba2994098926d4fb2\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/88579c158e026860c61c4192531e8bc42f4bc642\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/95040de81c629cd8d3c6ab5b50a8bd5088068303\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ae21b03f904736eb2aa9bd119d2a14e741f1681f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ba8f0ca386dd15acf5a93cbac932392c7818eab4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c53ed55cb275344086e32a7080a6b19cb183650b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/cff9fefdfbf5744afbb6d70bff2b49ec2065d23d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Important",
      "current_release_date": "2026-08-20T15:10:08+00:00",
      "cve": "CVE-2022-50747",
      "id": "CVE-2022-50747",
      "initial_release_date": "2022-01-01T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: Linux kernel: HFS filesystem out-of-bounds write via long filenames",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2022/cve-2022-50747.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-03T00:36:42Z",
      "cve": "CVE-2022-50747",
      "id": "CVE-2022-50747",
      "initial_release_date": "2025-12-25T01:04:18Z",
      "product_status:known_affected": "354",
      "product_status:known_not_affected": "323",
      "product_status:recommended": "219",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2022-50747",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2022-50747.json",
      "version": "28"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.