High 7.8Published Jun 24, 2026

CVE-2026-52992fs/adfs: validate nzones in adfs_validate_bblk()

Updated under an hour ago (Oct 28, 2026, 12:00 AM ET)

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Exploited in the last 30 days

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: 7.8 HIGH (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Analyzed
Record last updated: Jun 24, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from f6f14a0d71b0773a1d4147d1a3c33d537cd213ab before 33aafd2418a59c96c0389d47ea09026661fa9ec6; from f6f14a0d71b0773a1d4147d1a3c33d537cd213ab before 1f0ed0f57f0fc87e46fe19a05435c214dc464be2; from f6f14a0d71b0773a1d4147d1a3c33d537cd213ab before 6ff8cca5cdb4f2e0ea6d28ecd78479dd3f221ebc; from f6f14a0d71b0773a1d4147d1a3c33d537cd213ab before a11372a8b1ceaa5e950a84b3b5fbf8228f25e277; from f6f14a0d71b0773a1d4147d1a3c33d537cd213ab before 1586bd2d2fb436a26df20a70e78b000d34a7d159; from f6f14a0d71b0773a1d4147d1a3c33d537cd213ab before a3fd5dc1c7b0aae947a67dc2e2c037d57557a4de; from f6f14a0d71b0773a1d4147d1a3c33d537cd213ab before 60d82592ac8b5637fbed871381eb0a16df0a492e; from f6f14a0d71b0773a1d4147d1a3c33d537cd213ab before dd9d3e16c2d5fa166e13dce07413be51f42c8f5d	CNA record
linux linux_kernel linux:linux_kernel	from 5.6 before 5.10.258; from 5.11 before 5.15.209; from 5.16 before 6.1.175; from 6.2 before 6.6.141; from 6.7 before 6.12.91; from 6.13 before 6.18.33; from 6.19 before 7.0.10	NVD

References

References

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

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.