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Review reviewCritical

CVE-2024-26828

Linux Linux, linux kernel

In the Linux kernel, the following vulnerability has been resolved: cifs: fix underflow in parse_server_interfaces() In this loop, we step through the buffer and after each item we check if the size_left is greater than the minimum size we need. However, the problem is that "bytes_left" is type ssize_t while sizeof() is type size_t. That means that because of type promotion, the comparison is done as an unsigned and if we have negative bytes left the loop continues instead of ending.

CVSS
9.4
EPSS
0.75%
51.4% percentile
CISA KEV
Not listed
Published
2024.04.17
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.75%
Technical severityCVSS 9.4

Vulnerability overview

In the Linux kernel, the following vulnerability has been resolved: cifs: fix underflow in parse_server_interfaces() In this loop, we step through the buffer and after each item we check if the size_left is greater than the minimum size we need. However, the problem is that "bytes_left" is type ssize_t while sizeof() is type size_t. That means that because of type promotion, the comparison is done as an unsigned and if we have negative bytes left the loop continues instead of ending.

Affected product and versions

Product
Linux Linux, linux kernel
Affected versions
>= fe856be475f7cf5ffcde57341d175ce9fd09434b < 7190353835b4a219abb70f90b06cdcae97f11512, >= fe856be475f7cf5ffcde57341d175ce9fd09434b < f7ff1c89fb6e9610d2b01c1821727729e6609308, >= fe856be475f7cf5ffcde57341d175ce9fd09434b < df2af9fdbc4ddde18a3371c4ca1a86596e8be301, >= fe856be475f7cf5ffcde57341d175ce9fd09434b < cffe487026be13eaf37ea28b783d9638ab147204, >= 4.18, >= 4.18 < 6.1.79, >= 6.2 < 6.6.18, >= 6.7 < 6.7.6, 6.8
Fixed versions
6.1.79, 6.6.18, 6.7.6

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:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:H
CWE
CWE-191
CVE-2024-26828 — Linux Linux, linux kernel | SECUFOCUS NOW