CVE-2026-64361 (GCVE-0-2026-64361)
Vulnerability from cvelistv5
Published
2026-07-25 08:50
Modified
2026-08-17 04:54
Severity ?
VLAI Severity ?
EPSS score ?
Summary
In the Linux kernel, the following vulnerability has been resolved:
hfs/hfsplus: fix u32 overflow in check_and_correct_requested_length
check_and_correct_requested_length() compares (off + len) against
node_size using u32 arithmetic. When the caller passes a large len
value (e.g. from an underflowed subtraction in hfs_brec_remove()),
off + len can wrap past 2^32 and produce a small result, causing the
bounds check to pass when it should fail.
For example, with off=14 and len=0xFFFFFFF2 (underflowed from
data_off - keyoffset - size in hfs_brec_remove), off + len wraps to 6,
which is less than a typical node_size of 512, so the check passes and
the subsequent memmove reads ~4GB past the node buffer.
Fix this by widening the addition to u64 before comparing against
node_size. This prevents the u32 wrap while keeping the logic
straightforward.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Linux | Linux |
Version: 67ecc81f6492275c9c54280532f558483c99c90e Version: a1a60e79502279f996e55052f50cc14919020475 Version: fe2891a9c43ab87d1a210d61e6438ca6936e2f62 Version: 384a66b89f9540a9a8cb0f48807697dfabaece4c Version: efc095b35b23297e419c2ab4fc1ed1a8f0781a29 Version: a431930c9bac518bf99d6b1da526a7f37ddee8d8 Version: a431930c9bac518bf99d6b1da526a7f37ddee8d8 Version: a431930c9bac518bf99d6b1da526a7f37ddee8d8 Version: e7d2dc2421e821e4045775e6dc226378328de6f6 Version: fc7f732984ec91f30be3e574e0644066d07f2b78 Version: eec522fd0d28106b14a59ab2d658605febe4a3bb Version: 5.10.241 ≤ Version: 5.15.190 ≤ Version: 6.1.149 ≤ Version: 6.6.103 ≤ Version: 6.12.43 ≤ Version: 5.4.297 ≤ Version: 6.15.11 ≤ Version: 6.16.2 ≤ |
||
{
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{
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],
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},
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{
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}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
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"vulnerable": true
},
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}
],
"negate": false,
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]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nhfs/hfsplus: fix u32 overflow in check_and_correct_requested_length\n\ncheck_and_correct_requested_length() compares (off + len) against\nnode_size using u32 arithmetic. When the caller passes a large len\nvalue (e.g. from an underflowed subtraction in hfs_brec_remove()),\noff + len can wrap past 2^32 and produce a small result, causing the\nbounds check to pass when it should fail.\n\nFor example, with off=14 and len=0xFFFFFFF2 (underflowed from\ndata_off - keyoffset - size in hfs_brec_remove), off + len wraps to 6,\nwhich is less than a typical node_size of 512, so the check passes and\nthe subsequent memmove reads ~4GB past the node buffer.\n\nFix this by widening the addition to u64 before comparing against\nnode_size. This prevents the u32 wrap while keeping the logic\nstraightforward."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 7.8,
"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"
},
"scenarios": [
{
"lang": "en",
"value": "AV:L - The vulnerable HFS/HFS+ B-tree operations are reachable through local filesystem syscalls such as removexattr() and rename() after a crafted volume is mounted. No network protocol directly supplies the malformed B-tree metadata.\nAC:L - A crafted B-tree deterministically produces the length underflow and u32 addition wrap; no race or condition outside the attacker\u0027s control is required.\nPR:L - Although mounting HFS/HFS+ requires init-namespace CAP_SYS_ADMIN, an unprivileged user with ordinary write access to a file on an already mounted crafted volume can trigger the flaw through user.* xattr removal or permitted rename operations.\nUI:N - The attacker can invoke the triggering filesystem syscall directly once the crafted volume is mounted; no action by another user is required.\nS:U - The corruption occurs in the kernel while processing filesystem metadata and does not cross a separate virtualization, IOMMU, or other security authority boundary.\nC:H - The wrapped near-4-GiB copy performs out-of-bounds reads and, in HFS+, can walk beyond the node\u0027s page-pointer array, providing a defensible path to broad kernel-memory disclosure.\nI:H - The affected move, copy, clear, and write paths can write beyond the B-tree node buffer; the huge memmove is therefore exploitable memory corruption rather than a read-only crash.\nA:H - The enormous out-of-bounds memory operation can reliably cause a kernel oops or panic and can corrupt large regions of kernel memory, producing complete system unavailability."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-17T04:54:07.849Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/c8dd112173c02adf539fe2ad34a45f5e0068780d"
},
{
"url": "https://git.kernel.org/stable/c/fc9d1447ca3cdc78d2e4ace1ce1f3a7c77ca08b1"
},
{
"url": "https://git.kernel.org/stable/c/671c3fcc2ad31c1311ea6414382a2d95104ae1b9"
},
{
"url": "https://git.kernel.org/stable/c/b6a481642ea1977be2f84dc08c5affd742c177e7"
},
{
"url": "https://git.kernel.org/stable/c/7399c3baee7bb622a92f0b895cd4d3009a693f2b"
},
{
"url": "https://git.kernel.org/stable/c/607217f7ad419b53926f71e3f75001813bbc08ad"
},
{
"url": "https://git.kernel.org/stable/c/c25d3c931a63e762fcaa9cb125b901c53b62403f"
},
{
"url": "https://git.kernel.org/stable/c/966cb76fb2857a4242cab6ea2ea17acf818a3da7"
}
],
"title": "hfs/hfsplus: fix u32 overflow in check_and_correct_requested_length",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-64361",
"datePublished": "2026-07-25T08:50:17.345Z",
"dateReserved": "2026-07-19T15:36:31.783Z",
"dateUpdated": "2026-08-17T04:54:07.849Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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