CVE-2026-52992

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.

EPSS — Exploit Prediction

0.0018

Probability of exploitation

0.08%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

References

Other References

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

Frequently Asked Questions

What is 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.

How do I check if I'm vulnerable to CVE-2026-52992? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

Description

EPSS — Exploit Prediction

References

Other References

Frequently Asked Questions

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