CVE-2022-50581

Status: DeferredHigh (7.8)—

In the Linux kernel, the following vulnerability has been resolved:

hfs: fix OOB Read in __hfs_brec_find

Syzbot reported a OOB read bug:

Fix this by adding a Check on len in hfs_write_inode() before calling hfs_brec_find().

Technical details traces, logs and code from the original report

==================================================================
BUG: KASAN: slab-out-of-bounds in hfs_strcmp+0x117/0x190
fs/hfs/string.c:84
Read of size 1 at addr ffff88807eb62c4e by task kworker/u4:1/11
CPU: 1 PID: 11 Comm: kworker/u4:1 Not tainted
6.1.0-rc6-syzkaller-00308-g644e9524388a #0
Workqueue: writeback wb_workfn (flush-7:0)
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_strcmp+0x117/0x190 fs/hfs/string.c:84
 __hfs_brec_find+0x213/0x5c0 fs/hfs/bfind.c:75
 hfs_brec_find+0x276/0x520 fs/hfs/bfind.c:138
 hfs_write_inode+0x34c/0xb40 fs/hfs/inode.c:462
 write_inode fs/fs-writeback.c:1440 [inline]

If the input inode of hfs_write_inode() is incorrect:
struct inode
  struct hfs_inode_info
    struct hfs_cat_key
      struct hfs_name
        u8 len # len is greater than HFS_NAMELEN(31) which is the
maximum length of an HFS filename

OOB read occurred:
hfs_write_inode()
  hfs_brec_find()
    __hfs_brec_find()
      hfs_cat_keycmp()
        hfs_strcmp() # OOB read occurred due to len is too large

CVSS

Version: 3.1
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Base score: 7.8

Exploitation probability (EPSS)

Probability of exploitation in the next 30 days: 0.18%
Percentile among all scored CVEs: 7
Score date: 10/6/2026

EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).

🎯 ATT&CK techniques

How this vulnerability is exploited and what the attacker gains, in MITRE ATT&CK terms.

ExploitationT1068 Exploitation for Privilege Escalationprivilege escalation85 %
Primary impactT1005 Data from Local Systemcollection75 %

Acceso local sin interacción de usuario (AV:L, UI:N) con privilegios de usuario (PR:L) permite leer datos fuera de límites en el kernel de Linux mediante manipulación de inode malformado.

Inferred by our analysis agent from the official description, CVSS vector and CWE, and checked by a supervisor. May contain errors.

🛡️ ATT&CK mitigations that cover these techniques

Threat Intelligence Program Execution Prevention Application Isolation and Sandboxing Exploit Protection Update Software Data Loss Prevention

Affected technologies (1)

⚠ AI-inferred from the description — NVD hasn't analyzed this CVE yet, these aren't verified CPEs.

Linux — Linux Kernel^AI

References

Raw JSON (NVD)

Show

{
  "id": "CVE-2022-50581",
  "cveTags": [],
  "metrics": {
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 7.8,
          "attackVector": "LOCAL",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "HIGH"
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        "impactScore": 5.9,
        "exploitabilityScore": 1.8
      }
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            }
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          "programFiles": [
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        }
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  ],
  "published": "2025-10-22T14:15:43.147",
  "references": [
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      "url": "https://git.kernel.org/stable/c/2344f17c0a89c181ab1a9fef57fd8c3bddfd6e30",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/bfc9d8f27f89717431a6aecce42ae230b437433f",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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    {
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      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/e9e692917c6e10a7066c7a6d092dcdc3d4e329f3",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Deferred",
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nhfs: fix OOB Read in __hfs_brec_find\n\nSyzbot reported a OOB read bug:\n\n==================================================================\nBUG: KASAN: slab-out-of-bounds in hfs_strcmp+0x117/0x190\nfs/hfs/string.c:84\nRead of size 1 at addr ffff88807eb62c4e by task kworker/u4:1/11\nCPU: 1 PID: 11 Comm: kworker/u4:1 Not tainted\n6.1.0-rc6-syzkaller-00308-g644e9524388a #0\nWorkqueue: writeback wb_workfn (flush-7:0)\nCall Trace:\n <TASK>\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_strcmp+0x117/0x190 fs/hfs/string.c:84\n __hfs_brec_find+0x213/0x5c0 fs/hfs/bfind.c:75\n hfs_brec_find+0x276/0x520 fs/hfs/bfind.c:138\n hfs_write_inode+0x34c/0xb40 fs/hfs/inode.c:462\n write_inode fs/fs-writeback.c:1440 [inline]\n\nIf the input inode of hfs_write_inode() is incorrect:\nstruct inode\n  struct hfs_inode_info\n    struct hfs_cat_key\n      struct hfs_name\n        u8 len # len is greater than HFS_NAMELEN(31) which is the\nmaximum length of an HFS filename\n\nOOB read occurred:\nhfs_write_inode()\n  hfs_brec_find()\n    __hfs_brec_find()\n      hfs_cat_keycmp()\n        hfs_strcmp() # OOB read occurred due to len is too large\n\nFix this by adding a Check on len in hfs_write_inode() before calling\nhfs_brec_find()."
    }
  ],
  "lastModified": "2026-08-04T10:18:19.893",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}