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NVD / CVE Program· CNA Linux

CVE-2022-50747: hfs: Fix OOB Write in hfs_asc2mac

Noroxi assessment

Priority: Monitor (action score 31/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.21% (FIRST EPSS).
  • Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: Linux Linux 6a95b17e4d4cd2d8278559f930b447f8c9c8cff9, 7af9cb8cbb81308ce4b06cc7164267faccbf75dd, 8399318b13dc9e0569dee07ba2994098926d4fb2.

Low priority for now. Upgrade to Linux Linux 6a95b17e4d4cd2d8278559f930b447f8c9c8cff9, 7af9cb8cbb81308ce4b06cc7164267faccbf75dd, 8399318b13dc9e0569dee07ba2994098926d4fb2 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

HighCVSS 7.8 · v3.1—No exploit Fix available
Published
Dec 24, 2025
Updated
Aug 5, 2026
EPSS
0.2% · 11th percentile
CWE
—

Report tools

JSON

Action score

31

Monitor

Low priority for now.

CVSS
31 / 40 · 7.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.2%

CNA vs NVD score

NVD
—
CNA · Linux
7.8
NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

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  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

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  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • 2.6.14affected
    • 328b9227865026268261a24a97a578907b280415 and later · before 8399318b13dc9e0569dee07ba2994098926d4fb2affected · git
    • 328b9227865026268261a24a97a578907b280415 and later · before 95040de81c629cd8d3c6ab5b50a8bd5088068303affected · git
    • 328b9227865026268261a24a97a578907b280415 and later · before ba8f0ca386dd15acf5a93cbac932392c7818eab4affected · git
    • 328b9227865026268261a24a97a578907b280415 and later · before 6a95b17e4d4cd2d8278559f930b447f8c9c8cff9affected · git
    • 328b9227865026268261a24a97a578907b280415 and later · before cff9fefdfbf5744afbb6d70bff2b49ec2065d23daffected · git
    • 328b9227865026268261a24a97a578907b280415 and later · before 7af9cb8cbb81308ce4b06cc7164267faccbf75ddaffected · git
    • 328b9227865026268261a24a97a578907b280415 and later · before ae21b03f904736eb2aa9bd119d2a14e741f1681faffected · git
    • 328b9227865026268261a24a97a578907b280415 and later · before 88579c158e026860c61c4192531e8bc42f4bc642affected · git
    • 328b9227865026268261a24a97a578907b280415 and later · before c53ed55cb275344086e32a7080a6b19cb183650baffected · git

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.4-16.1.4-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-74705udp: fix potential use-after-free in tunnel segmentation
    40Plan
  • CVE-2026-74612veth: fix skb length accounting after XDP frag adjustment
    40Plan
  • CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()
    40Plan

Published before and after this one in the same product

  • ← EarlierCVE-2022-50744Dec 24, 2025 · scsi: lpfc: Fix hard lockup when reading the rx_monitor from debugfs
    0Monitor
  • ← EarlierCVE-2022-50745Dec 24, 2025 · staging: media: tegra-video: fix device_node use after free
    31Monitor
  • Later →CVE-2022-50748Dec 24, 2025 · ipc: mqueue: fix possible memory leak in init_mqueue_fs()
    0Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux6a95b17e4d4cd2d8278559f930b447f8c9c8cff9Vendor (CNA)
Linux Linux7af9cb8cbb81308ce4b06cc7164267faccbf75ddVendor (CNA)
Linux Linux8399318b13dc9e0569dee07ba2994098926d4fb2Vendor (CNA)
Linux Linux88579c158e026860c61c4192531e8bc42f4bc642Vendor (CNA)
Linux Linux95040de81c629cd8d3c6ab5b50a8bd5088068303Vendor (CNA)
Linux Linuxae21b03f904736eb2aa9bd119d2a14e741f1681fVendor (CNA)
Linux Linuxba8f0ca386dd15acf5a93cbac932392c7818eab4Vendor (CNA)
Linux Linuxc53ed55cb275344086e32a7080a6b19cb183650bVendor (CNA)
Linux Linuxcff9fefdfbf5744afbb6d70bff2b49ec2065d23dVendor (CNA)
debian:linux6.1.4-1 · Debian:12Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

No history yet (it accumulates with the daily EPSS job).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

—

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

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References

Show all references (8 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records