CVE-2026-64324 (GCVE-0-2026-64324)
Vulnerability from cvelistv5 – Published: 2026-07-25 08:49 – Updated: 2026-07-27 04:59
VLAI
EPSS
VEX
Title
udf: validate free block extents against the partition length
Summary
In the Linux kernel, the following vulnerability has been resolved:
udf: validate free block extents against the partition length
udf_free_blocks() checks the logical block number and count against the
partition length, but drops the extent offset from that final bound. A
crafted extent can pass the guard while logicalBlockNum + offset + count
points past the partition, which later indexes past the space bitmap
array.
A single ftruncate(2) on a file backed by such an extent reliably
panics the kernel. This is a local availability issue. On desktop
systems where UDisks/polkit allows the active user to mount removable
UDF media without CAP_SYS_ADMIN, an unprivileged local user can supply
the crafted filesystem and trigger the panic by truncating a writable
file on it. Systems that require root or CAP_SYS_ADMIN to mount the
image have a higher prerequisite.
No confidentiality or integrity impact is claimed: the reproduced
primitive is an out-of-bounds read of a bitmap pointer slot followed by
a kernel panic.
Use the already computed logicalBlockNum + offset + count value for the
partition length check. Also make load_block_bitmap() reject an
out-of-range block group before indexing s_block_bitmap[], so corrupted
callers cannot walk past the flexible array.
Severity
7.8 (High)
Assigner
References
8 references
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| Linux | Linux |
Affected:
934f815345c09c290a9b9a9cfdddc203ec2117e8 , < fdd6229d2ae9914c1f25d1041db0f4f312a4fa76
(git)
Affected: 22cc7323f090646c8cfb5939e6f15bdc2ed3fd27 , < b54aee5652fcd7c23a0904a4623ec462c3edc70c (git) Affected: 7c4fa9ebfce69619d132fe703dc2e2cf62a13723 , < 12af328d2ee8d68e81ba612246d0b54b22d23e1f (git) Affected: 5cc9745e2ea11aef7d5c9a42bc36f6cd3e1b4cc3 , < fb49099206c5c57af28a157249fa7bcb5518f99e (git) Affected: 56e69e59751d20993f243fb7dd6991c4e522424c , < 9442d75429b0c556292a7454fe888d54259f5240 (git) Affected: 56e69e59751d20993f243fb7dd6991c4e522424c , < 335202ab25b01fdd45889ff25eab70864686dea3 (git) Affected: 56e69e59751d20993f243fb7dd6991c4e522424c , < be87de7789a82a030a4896bc7683415ec9fa6f2b (git) Affected: 56e69e59751d20993f243fb7dd6991c4e522424c , < 5f0419457f89dce1a3f1c8e62a3adf2f39ab8168 (git) Affected: 097420e48e30f51e8f4f650b5c946f5af63ec1a3 (git) Affected: 5def895b42ef16a2da6402818cba8d7ec8ede1ef (git) Affected: 05fb2bf477d3fe5421bd4cb699574737f52bd88b (git) Affected: 5.10.224 , < 5.10.261 (semver) Affected: 5.15.165 , < 5.15.212 (semver) Affected: 6.1.105 , < 6.1.178 (semver) Affected: 6.6.46 , < 6.6.145 (semver) Affected: 4.19.320 , < 4.20 (semver) Affected: 5.4.282 , < 5.5 (semver) Affected: 6.10.5 , < 6.11 (semver) |
|
| Linux | Linux |
Affected:
6.11
Unaffected: 0 , < 6.11 (semver) Unaffected: 5.10.261 , ≤ 5.10.* (semver) Unaffected: 5.15.212 , ≤ 5.15.* (semver) Unaffected: 6.1.178 , ≤ 6.1.* (semver) Unaffected: 6.6.145 , ≤ 6.6.* (semver) Unaffected: 6.12.96 , ≤ 6.12.* (semver) Unaffected: 6.18.39 , ≤ 6.18.* (semver) Unaffected: 7.1.4 , ≤ 7.1.* (semver) Unaffected: 7.2-rc1 , ≤ * (original_commit_for_fix) |
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On desktop\\nsystems where UDisks/polkit allows the active user to mount removable\\nUDF media without CAP_SYS_ADMIN, an unprivileged local user can supply\\nthe crafted filesystem and trigger the panic by truncating a writable\\nfile on it. Systems that require root or CAP_SYS_ADMIN to mount the\\nimage have a higher prerequisite.\\n\\nNo confidentiality or integrity impact is claimed: the reproduced\\nprimitive is an out-of-bounds read of a bitmap pointer slot followed by\\na kernel panic.\\n\\nUse the already computed logicalBlockNum + offset + count value for the\\npartition length check. 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"suse_vex": {
"aggregate_severity": "not set",
"current_release_date": "2026-07-25T16:45:42Z",
"cve": "CVE-2026-64324",
"id": "CVE-2026-64324",
"initial_release_date": "2026-07-25T16:45:42Z",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2026-64324",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-64324.json",
"version": "2"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
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.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
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