CVE-2025-40049
Vulnerability Scoring
Analysis In Progress
CVE-2025-40049 Vulnerability Analysis & Exploit Details
CVE-2025-40049
Attack Complexity Details
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Attack Complexity:
Attack Complexity Analysis In Progress
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Attack Vector:
Attack Vector Under Analysis
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Privileges Required:
None
No authentication is required for exploitation.
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Scope:
Impact is confined to the initially vulnerable component.
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User Interaction:
None
No user interaction is necessary for exploitation.
CVE-2025-40049 Details
Status: Awaiting Analysis
Last updated: 🕒 30 Oct 2025, 15:05 UTC
Originally published on: 🕛 28 Oct 2025, 12:15 UTC
Time between publication and last update: 2 days
CVSS Release:
CVE-2025-40049 Vulnerability Summary
CVE-2025-40049: In the Linux kernel, the following vulnerability has been resolved: Squashfs: fix uninit-value in squashfs_get_parent Syzkaller reports a "KMSAN: uninit-value in squashfs_get_parent" bug. This is caused by open_by_handle_at() being called with a file handle containing an invalid parent inode number. In particular the inode number is that of a symbolic link, rather than a directory. Squashfs_get_parent() gets called with that symbolic link inode, and accesses the parent member field. unsigned int parent_ino = squashfs_i(inode)->parent; Because non-directory inodes in Squashfs do not have a parent value, this is uninitialised, and this causes an uninitialised value access. The fix is to initialise parent with the invalid inode 0, which will cause an EINVAL error to be returned. Regular inodes used to share the parent field with the block_list_start field. This is removed in this commit to enable the parent field to contain the invalid inode number 0.
Assessing the Risk of CVE-2025-40049
Access Complexity Graph
The exploitability of CVE-2025-40049 depends on two key factors: attack complexity (the level of effort required to execute an exploit) and privileges required (the access level an attacker needs).
Exploitability Analysis for CVE-2025-40049
No exploitability data is available for CVE-2025-40049.
Understanding AC and PR
A lower complexity and fewer privilege requirements make exploitation easier. Security teams should evaluate these aspects to determine the urgency of mitigation strategies, such as patch management and access control policies.
Attack Complexity (AC) measures the difficulty in executing an exploit. A high AC means that specific conditions must be met, making an attack more challenging, while a low AC means the vulnerability can be exploited with minimal effort.
Privileges Required (PR) determine the level of system access necessary for an attack. Vulnerabilities requiring no privileges are more accessible to attackers, whereas high privilege requirements limit exploitation to authorized users with elevated access.
CVSS Score Breakdown Chart
Above is the CVSS Sub-score Breakdown for CVE-2025-40049, illustrating how Base, Impact, and Exploitability factors combine to form the overall severity rating. A higher sub-score typically indicates a more severe or easier-to-exploit vulnerability.
CIA Impact Analysis
Below is the Impact Analysis for CVE-2025-40049, showing how Confidentiality, Integrity, and Availability might be affected if the vulnerability is exploited. Higher values usually signal greater potential damage.
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Confidentiality:
None
CVE-2025-40049 does not compromise confidentiality.
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Integrity:
None
CVE-2025-40049 does not impact data integrity.
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Availability:
None
CVE-2025-40049 does not affect system availability.
CVE-2025-40049 References
External References
- https://git.kernel.org/stable/c/1b3ccd0019132880c94bb00ca7088c1749308f82
- https://git.kernel.org/stable/c/382a47fae449e554ef1e8c198667fd2f3270b945
- https://git.kernel.org/stable/c/61d38b5ce2782bff3cacaacbb8164087a73ed1a5
- https://git.kernel.org/stable/c/74058c0a9fc8b2b4d5f4a0ef7ee2cfa66a9e49cf
- https://git.kernel.org/stable/c/81a2bca52d43fc9d9abf07408b91255131c5dc53
- https://git.kernel.org/stable/c/91b99db7a92e57ff48a96a1b10fddfd2547e7f53
- https://git.kernel.org/stable/c/c28b0ca029edf5d0558abcd76cb8c732706cd339
- https://git.kernel.org/stable/c/f81a5bc9e924ee1950e0dd82bd10749048390f6e
CWE Common Weakness Enumeration
Unknown
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