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Review reviewCritical

CVE-2024-35869

Linux Linux, linux_kernel, linux kernel

In the Linux kernel, the following vulnerability has been resolved: smb: client: guarantee refcounted children from parent session Avoid potential use-after-free bugs when walking DFS referrals, mounting and performing DFS failover by ensuring that all children from parent @tcon->ses are also refcounted. They're all needed across the entire DFS mount. Get rid of @tcon->dfs_ses_list while we're at it, too.

CVSS
9.8
EPSS
0.65%
47.5% percentile
CISA KEV
Not listed
Published
2024.05.19
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.65%
Technical severityCVSS 9.8

Vulnerability overview

In the Linux kernel, the following vulnerability has been resolved: smb: client: guarantee refcounted children from parent session Avoid potential use-after-free bugs when walking DFS referrals, mounting and performing DFS failover by ensuring that all children from parent @tcon->ses are also refcounted. They're all needed across the entire DFS mount. Get rid of @tcon->dfs_ses_list while we're at it, too.

Affected product and versions

Product
Linux Linux, linux_kernel, linux kernel
Affected versions
>= 8e3554150d6c80a84b3cb046615d1a0e943811dc < 645f332c6b63499cc76197f9b6bffcc659ba64cc, >= 8e3554150d6c80a84b3cb046615d1a0e943811dc < e1db9ae87b7148c021daee1fcc4bc71b2ac58a79, >= 8e3554150d6c80a84b3cb046615d1a0e943811dc < 062a7f0ff46eb57aff526897bd2bebfdb1d3046a, >= f30d226bcc9f0e2d97b4a6e94c43a28148fbeab6, >= c082c3be0f96e759ff2e361d929832fda0b93851, >= 6.2.15 < 6.3, >= 6.3.2 < 6.4, >= 6.4, >= 1da177e4c3f4 < 645f332c6b63, >= 1da177e4c3f4 < e1db9ae87b71, >= 1da177e4c3f4 < 062a7f0ff46e, >= 6.2.8 < 6.3, >= 6.4 < 6.6.29, >= 6.7 < 6.8.5, 6.9
Fixed versions
6.3, 6.6.29, 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, 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:H/A:H
CWE
CWE-416