CVE-2022-49044: linux kernel Memory Corruption — Fix

Description

In the Linux kernel, the following vulnerability has been resolved: dm integrity: fix memory corruption when tag_size is less than digest size It is possible to set up dm-integrity in such a way that the "tag_size" parameter is less than the actual digest size. In this situation, a part of the digest beyond tag_size is ignored. In this case, dm-integrity would write beyond the end of the ic->recalc_tags array and corrupt memory. The corruption happened in integrity_recalc->integrity_sector_checksum->crypto_shash_final. Fix this corruption by increasing the tags array so that it has enough padding at the end to accomodate the loop in integrity_recalc() being able to write a full digest size for the last member of the tags array.

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CVSS v3.1 Score

7.8

HIGH

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Weakness Type (CWE)

CWE-787 Out-of-bounds Write

Affected Products

Vendor	Product	Versions
linux	linux_kernel	4.12 — 4.19.240
linux	linux_kernel	4.20 — 5.4.190
linux	linux_kernel	5.5 — 5.10.112
linux	linux_kernel	5.11 — 5.15.35
linux	linux_kernel	5.16 — 5.17.4
linux	linux_kernel	All
linux	linux_kernel	All

References

Advisories & Patches

https://git.kernel.org/stable/c/08c1af8f1c13bbf210f1760132f4df24d0ed46d6 https://git.kernel.org/stable/c/4d485cf9b609709e45d5113e6e2b1b01254b2fe9 https://git.kernel.org/stable/c/6a95d91c0b315c965198f6ab7dec7c94129e17e0 https://git.kernel.org/stable/c/6b4bf97587ef6c1927a78934b700204920655123 https://git.kernel.org/stable/c/7f84c937222944c03f4615ca4742df6bed0e5adf https://git.kernel.org/stable/c/cd02b2687d66f0a8e716384de4b9a0671331f1dc

Frequently Asked Questions

What is CVE-2022-49044? +

In the Linux kernel, the following vulnerability has been resolved: dm integrity: fix memory corruption when tag_size is less than digest size It is possible to set up dm-integrity in such a way that the "tag_size" parameter is less than the actual digest size. In this situation, a part of the digest beyond tag_size is ignored. In this case, dm-integrity would write beyond the end of the ic->recalc_tags array and corrupt memory. The corruption happened in integrity_recalc->integrity_sector_checksum->crypto_shash_final. Fix this corruption by increasing the tags array so that it has enough padding at the end to accomodate the loop in integrity_recalc() being able to write a full digest size for the last member of the tags array. It has a CVSS v3.1 base score of 7.8 (HIGH).

How severe is CVE-2022-49044? +

CVE-2022-49044 has a CVSS v3.1 score of 7.8 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.

What products are affected by CVE-2022-49044? +

CVE-2022-49044 affects products from linux, specifically: linux_kernel. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2022-49044? +

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.

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