Vulnerability-Lookup

FKIE_CVE-2026-46169

Vulnerability from fkie_nvd - Published: 2026-05-28 10:16 - Updated: 2026-06-11 12:56

Severity

5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Summary

In the Linux kernel, the following vulnerability has been resolved: hfsplus: fix uninit-value by validating catalog record size Syzbot reported a KMSAN uninit-value issue in hfsplus_strcasecmp(). The root cause is that hfs_brec_read() doesn't validate that the on-disk record size matches the expected size for the record type being read. When mounting a corrupted filesystem, hfs_brec_read() may read less data than expected. For example, when reading a catalog thread record, the debug output showed: HFSPLUS_BREC_READ: rec_len=520, fd->entrylength=26 HFSPLUS_BREC_READ: WARNING - entrylength (26) < rec_len (520) - PARTIAL READ! hfs_brec_read() only validates that entrylength is not greater than the buffer size, but doesn't check if it's less than expected. It successfully reads 26 bytes into a 520-byte structure and returns success, leaving 494 bytes uninitialized. This uninitialized data in tmp.thread.nodeName then gets copied by hfsplus_cat_build_key_uni() and used by hfsplus_strcasecmp(), triggering the KMSAN warning when the uninitialized bytes are used as array indices in case_fold(). Fix by introducing hfsplus_brec_read_cat() wrapper that: 1. Calls hfs_brec_read() to read the data 2. Validates the record size based on the type field: - Fixed size for folder and file records - Variable size for thread records (depends on string length) 3. Returns -EIO if size doesn't match expected For thread records, check against HFSPLUS_MIN_THREAD_SZ before reading nodeName.length to avoid reading uninitialized data at call sites that don't zero-initialize the entry structure. Also initialize the tmp variable in hfsplus_find_cat() as defensive programming to ensure no uninitialized data even if validation is bypassed.

References

URL	Tags
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/61a790974ff7e533acbceca06c7d02f22bf96d4d	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/93e8d613f1a01b6637f387cc93f184cf7fb881d6	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/a420904450962a562ad053a41a53a27755021b48	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/b6b592275aeff184aa82fcf6abccd833fb71b393	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/c91bbd6193c70a02c50c22e0fb1f60c3c5bd053a	Patch

Impacted products

Vendor	Product	Version
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	2.6.12
linux	linux_kernel	2.6.12
linux	linux_kernel	2.6.12
linux	linux_kernel	2.6.12
linux	linux_kernel	2.6.12

JSON

To clipboard

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      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nhfsplus: fix uninit-value by validating catalog record size\n\nSyzbot reported a KMSAN uninit-value issue in hfsplus_strcasecmp(). The\nroot cause is that hfs_brec_read() doesn\u0027t validate that the on-disk\nrecord size matches the expected size for the record type being read.\n\nWhen mounting a corrupted filesystem, hfs_brec_read() may read less data\nthan expected. For example, when reading a catalog thread record, the\ndebug output showed:\n\n  HFSPLUS_BREC_READ: rec_len=520, fd-\u003eentrylength=26\n  HFSPLUS_BREC_READ: WARNING - entrylength (26) \u003c rec_len (520) - PARTIAL READ!\n\nhfs_brec_read() only validates that entrylength is not greater than the\nbuffer size, but doesn\u0027t check if it\u0027s less than expected. It successfully\nreads 26 bytes into a 520-byte structure and returns success, leaving 494\nbytes uninitialized.\n\nThis uninitialized data in tmp.thread.nodeName then gets copied by\nhfsplus_cat_build_key_uni() and used by hfsplus_strcasecmp(), triggering\nthe KMSAN warning when the uninitialized bytes are used as array indices\nin case_fold().\n\nFix by introducing hfsplus_brec_read_cat() wrapper that:\n1. Calls hfs_brec_read() to read the data\n2. Validates the record size based on the type field:\n   - Fixed size for folder and file records\n   - Variable size for thread records (depends on string length)\n3. Returns -EIO if size doesn\u0027t match expected\n\nFor thread records, check against HFSPLUS_MIN_THREAD_SZ before reading\nnodeName.length to avoid reading uninitialized data at call sites that\ndon\u0027t zero-initialize the entry structure.\n\nAlso initialize the tmp variable in hfsplus_find_cat() as defensive\nprogramming to ensure no uninitialized data even if validation is\nbypassed."
    }
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          "baseScore": 5.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
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        "impactScore": 3.6,
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CVE-2026-46169 (GCVE-0-2026-46169)

Vulnerability from cvelistv5 – Published: 2026-05-28 09:36 – Updated: 2026-05-28 09:36

Title

hfsplus: fix uninit-value by validating catalog record size

Summary

Severity

No CVSS data available.

Assigner

Linux

References

5 references

URL	Tags
https://git.kernel.org/stable/c/61a790974ff7e533a…
https://git.kernel.org/stable/c/c91bbd6193c70a02c…
https://git.kernel.org/stable/c/a420904450962a562…
https://git.kernel.org/stable/c/93e8d613f1a01b663…
https://git.kernel.org/stable/c/b6b592275aeff184a…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 61a790974ff7e533acbceca06c7d02f22bf96d4d (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < c91bbd6193c70a02c50c22e0fb1f60c3c5bd053a (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < a420904450962a562ad053a41a53a27755021b48 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 93e8d613f1a01b6637f387cc93f184cf7fb881d6 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < b6b592275aeff184aa82fcf6abccd833fb71b393 (git)
Linux	Linux	Affected: 2.6.12 Unaffected: 0 , < 2.6.12 (semver) Unaffected: 6.6.140 , ≤ 6.6.* (semver) Unaffected: 6.12.88 , ≤ 6.12.* (semver) Unaffected: 6.18.30 , ≤ 6.18.* (semver) Unaffected: 7.0.7 , ≤ 7.0.* (semver) Unaffected: 7.1-rc1 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

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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.

Action not permitted

FKIE_CVE-2026-46169

CVE-2026-46169 (GCVE-0-2026-46169)

Tags

Sightings

Nomenclature