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Review reviewHigh

CVE-2024-36019

Linux Linux, linux kernel

In the Linux kernel, the following vulnerability has been resolved: regmap: maple: Fix cache corruption in regcache_maple_drop() When keeping the upper end of a cache block entry, the entry[] array must be indexed by the offset from the base register of the block, i.e. max - mas.index. The code was indexing entry[] by only the register address, leading to an out-of-bounds access that copied some part of the kernel memory over the cache contents. This bug was not detected by the regmap KUnit test because it only tests with a block of registers starting at 0, so mas.index == 0.

CVSS
7.1
EPSS
0.24%
15.3% percentile
CISA KEV
Not listed
Published
2024.05.31
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.24%
Technical severityCVSS 7.1

Vulnerability overview

In the Linux kernel, the following vulnerability has been resolved: regmap: maple: Fix cache corruption in regcache_maple_drop() When keeping the upper end of a cache block entry, the entry[] array must be indexed by the offset from the base register of the block, i.e. max - mas.index. The code was indexing entry[] by only the register address, leading to an out-of-bounds access that copied some part of the kernel memory over the cache contents. This bug was not detected by the regmap KUnit test because it only tests with a block of registers starting at 0, so mas.index == 0.

Affected product and versions

Product
Linux Linux, linux kernel
Affected versions
>= f033c26de5a5734625d2dd1dc196745fae186f1b < 3af6c5ac72dc5b721058132a0a1d7779e443175e, >= f033c26de5a5734625d2dd1dc196745fae186f1b < 51c4440b9d3fd7c8234e6de9170a487c03506e53, >= f033c26de5a5734625d2dd1dc196745fae186f1b < 00bb549d7d63a21532e76e4a334d7807a54d9f31, >= 6.4, >= 6.4 < 6.6.26, >= 6.7 < 6.8.5, 6.9
Fixed versions
6.6.26, 6.8.5

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux Linux, linux kernel and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
CWE
CWE-125
CVE-2024-36019 — Linux Linux, linux kernel | SECUFOCUS NOW