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.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.14%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
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 3.1
- 7.8 HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 0.14% probability · 4th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-787
- Affected
- linux/linux kernel
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/1586bd2d2fb436a26df20a70e78b000d34a7d159Patch
- https://git.kernel.org/stable/c/1f0ed0f57f0fc87e46fe19a05435c214dc464be2Patch
- https://git.kernel.org/stable/c/33aafd2418a59c96c0389d47ea09026661fa9ec6Patch
- https://git.kernel.org/stable/c/60d82592ac8b5637fbed871381eb0a16df0a492ePatch
- https://git.kernel.org/stable/c/6ff8cca5cdb4f2e0ea6d28ecd78479dd3f221ebcPatch
- https://git.kernel.org/stable/c/a11372a8b1ceaa5e950a84b3b5fbf8228f25e277Patch
- https://git.kernel.org/stable/c/a3fd5dc1c7b0aae947a67dc2e2c037d57557a4dePatch
- https://git.kernel.org/stable/c/dd9d3e16c2d5fa166e13dce07413be51f42c8f5dPatch
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.