CVE-2026-52992

In the Linux kernel, the following vulnerability has been resolved: fs/adfs: validate nzones in adfs_validate_bblk() Reject ADFS disc records with a zero zone count during boot block validation, before the disc record is used. When nzones is 0, adfs_read_map() passes it to kmalloc_array(0, ...) which returns ZERO_SIZE_PTR, and adfs_map_layout() then writes to dm[-1], causing an out-of-bounds write before the allocated buffer. adfs_validate_dr0() already rejects nzones != 1 for old-format images. Add the equivalent check to adfs_validate_bblk() for new-format images so that a crafted image with nzones == 0 is rejected at probe time. Found by syzkaller.

CVSS v3 7.8 HIGH

7.8^/10

CVSS v3 : HIGH

Vector :

Exploitability : 1.8 / Impact : 5.9

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://git.kernel.org/stable/c/1586bd2d2fb436a26df20a70e78b000d34a7d159	Patch
https://git.kernel.org/stable/c/1f0ed0f57f0fc87e46fe19a05435c214dc464be2	Patch
https://git.kernel.org/stable/c/33aafd2418a59c96c0389d47ea09026661fa9ec6	Patch
https://git.kernel.org/stable/c/60d82592ac8b5637fbed871381eb0a16df0a492e	Patch
https://git.kernel.org/stable/c/6ff8cca5cdb4f2e0ea6d28ecd78479dd3f221ebc	Patch
https://git.kernel.org/stable/c/a11372a8b1ceaa5e950a84b3b5fbf8228f25e277	Patch
https://git.kernel.org/stable/c/a3fd5dc1c7b0aae947a67dc2e2c037d57557a4de	Patch
https://git.kernel.org/stable/c/dd9d3e16c2d5fa166e13dce07413be51f42c8f5d	Patch

Configurations

Configuration 1 (hide)

OR	cpe:2.3:o:linux:linux_kernel::::::::
	cpe:2.3:o:linux:linux_kernel::::::::
	cpe:2.3:o:linux:linux_kernel::::::::
	cpe:2.3:o:linux:linux_kernel::::::::
	cpe:2.3:o:linux:linux_kernel::::::::
	cpe:2.3:o:linux:linux_kernel::::::::
	cpe:2.3:o:linux:linux_kernel::::::::

History

No history.

Information

Published : 2026-06-24 17:17

Updated : 2026-07-14 19:44

NVD link : CVE-2026-52992

Mitre link : CVE-2026-52992

CVE.ORG link : CVE-2026-52992

JSON object : View

Products Affected

linux

linux_kernel

CWE

CWE-787

Out-of-bounds Write

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kmalloc_array(0, ...)\nwhich returns ZERO_SIZE_PTR, and adfs_map_layout() then writes to\ndm[-1], causing an out-of-bounds write before the allocated buffer.\n\nadfs_validate_dr0() already rejects nzones != 1 for old-format\nimages. 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