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Review reviewHigh

CVE-2024-26983

Linux Linux, linux kernel

In the Linux kernel, the following vulnerability has been resolved: bootconfig: use memblock_free_late to free xbc memory to buddy On the time to free xbc memory in xbc_exit(), memblock may has handed over memory to buddy allocator. So it doesn't make sense to free memory back to memblock. memblock_free() called by xbc_exit() even causes UAF bugs on architectures with CONFIG_ARCH_KEEP_MEMBLOCK disabled like x86. Following KASAN logs shows this case. This patch fixes the xbc memory free problem by calling memblock_free() in early xbc init error rewind path and calling memblock_free_late() in...

CVSS
7.8
EPSS
0.23%
13.9% percentile
CISA KEV
Not listed
Published
2024.05.01
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.23%
Technical severityCVSS 7.8

Vulnerability overview

In the Linux kernel, the following vulnerability has been resolved: bootconfig: use memblock_free_late to free xbc memory to buddy On the time to free xbc memory in xbc_exit(), memblock may has handed over memory to buddy allocator. So it doesn't make sense to free memory back to memblock. memblock_free() called by xbc_exit() even causes UAF bugs on architectures with CONFIG_ARCH_KEEP_MEMBLOCK disabled like x86. Following KASAN logs shows this case. This patch fixes the xbc memory free problem by calling memblock_free() in early xbc init error rewind path and calling memblock_free_late() in...

Affected product and versions

Product
Linux Linux, linux kernel
Affected versions
>= 40caa127f3c7279c75cb0c9684559fa314ee3a66 < 1e7feb31a18c197d63a5e606025ed63c762f8918, >= 40caa127f3c7279c75cb0c9684559fa314ee3a66 < e46d3be714ad9652480c6db129ab8125e2d20ab7, >= 40caa127f3c7279c75cb0c9684559fa314ee3a66 < 5a7dfb8fcd3f29fc93161100179b27f24f3d5f35, >= 40caa127f3c7279c75cb0c9684559fa314ee3a66 < 89f9a1e876b5a7ad884918c03a46831af202c8a0, >= 5.15, >= 5.15 < 6.1.88, >= 6.2 < 6.6.29, >= 6.7 < 6.8.8, 6.9
Fixed versions
6.1.88, 6.6.29, 6.8.8

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:H/A:H
CWE
CWE-416
CVE-2024-26983 — Linux Linux, linux kernel | SECUFOCUS NOW