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Review reviewHigh

CVE-2024-40900

Linux Linux, linux kernel

In the Linux kernel, the following vulnerability has been resolved: cachefiles: remove requests from xarray during flushing requests Even with CACHEFILES_DEAD set, we can still read the requests, so in the following concurrency the request may be used after it has been freed: mount | daemon_thread1 | daemon_thread2 ------------------------------------------------------------ cachefiles_ondemand_init_object cachefiles_ondemand_send_req REQ_A = kzalloc(sizeof(*req) + data_len) wait_for_completion(&REQ_A->done) cachefiles_daemon_read cachefiles_ondemand_daemon_read // close dev fd cachefiles_f...

CVSS
7.8
EPSS
0.29%
20.8% percentile
CISA KEV
Not listed
Published
2024.07.12
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.29%
Technical severityCVSS 7.8

Vulnerability overview

In the Linux kernel, the following vulnerability has been resolved: cachefiles: remove requests from xarray during flushing requests Even with CACHEFILES_DEAD set, we can still read the requests, so in the following concurrency the request may be used after it has been freed: mount | daemon_thread1 | daemon_thread2 ------------------------------------------------------------ cachefiles_ondemand_init_object cachefiles_ondemand_send_req REQ_A = kzalloc(sizeof(*req) + data_len) wait_for_completion(&REQ_A->done) cachefiles_daemon_read cachefiles_ondemand_daemon_read // close dev fd cachefiles_f...

Affected product and versions

Product
Linux Linux, linux kernel
Affected versions
>= c8383054506c77b814489c09877b5db83fd4abf2 < 9f13aacdd4ee9a7644b2a3c96d67113cd083c9c7, >= c8383054506c77b814489c09877b5db83fd4abf2 < 50d0e55356ba5b84ffb51c42704126124257e598, >= c8383054506c77b814489c09877b5db83fd4abf2 < 37e19cf86a520d65de1de9cb330415c332a40d19, >= c8383054506c77b814489c09877b5db83fd4abf2 < 0fc75c5940fa634d84e64c93bfc388e1274ed013, >= 5.19, >= 5.19 < 6.1.95, >= 6.2 < 6.6.35, >= 6.7 < 6.9.6, 6.10
Fixed versions
6.1.95, 6.6.35, 6.9.6

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:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE
CWE-416