CVE-2024-49889 (GCVE-0-2024-49889)

Vulnerability from cvelistv5 – Published: 2024-10-21 18:01 – Updated: 2026-01-05 10:54
VLAI?
Title
ext4: avoid use-after-free in ext4_ext_show_leaf()
Summary
In the Linux kernel, the following vulnerability has been resolved: ext4: avoid use-after-free in ext4_ext_show_leaf() In ext4_find_extent(), path may be freed by error or be reallocated, so using a previously saved *ppath may have been freed and thus may trigger use-after-free, as follows: ext4_split_extent path = *ppath; ext4_split_extent_at(ppath) path = ext4_find_extent(ppath) ext4_split_extent_at(ppath) // ext4_find_extent fails to free path // but zeroout succeeds ext4_ext_show_leaf(inode, path) eh = path[depth].p_hdr // path use-after-free !!! Similar to ext4_split_extent_at(), we use *ppath directly as an input to ext4_ext_show_leaf(). Fix a spelling error by the way. Same problem in ext4_ext_handle_unwritten_extents(). Since 'path' is only used in ext4_ext_show_leaf(), remove 'path' and use *ppath directly. This issue is triggered only when EXT_DEBUG is defined and therefore does not affect functionality.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: dfe5080939ea4686b3414b5d970a9b26733c57a4 , < b0cb4561fc4284d04e69c8a66c8504928ab2484e (git)
Affected: dfe5080939ea4686b3414b5d970a9b26733c57a4 , < 4999fed877bb64e3e7f9ab9996de2ca983c41928 (git)
Affected: dfe5080939ea4686b3414b5d970a9b26733c57a4 , < 2eba3b0cc5b8de624918d21f32b5b8db59a90b39 (git)
Affected: dfe5080939ea4686b3414b5d970a9b26733c57a4 , < 34b2096380ba475771971a778a478661a791aa15 (git)
Affected: dfe5080939ea4686b3414b5d970a9b26733c57a4 , < 8b114f2cc7dd5d36729d040b68432fbd0f0a8868 (git)
Affected: dfe5080939ea4686b3414b5d970a9b26733c57a4 , < d483c7cc1796bd6a80e7b3a8fd494996260f6b67 (git)
Affected: dfe5080939ea4686b3414b5d970a9b26733c57a4 , < 4e2524ba2ca5f54bdbb9e5153bea00421ef653f5 (git)
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    Linux Linux Affected: 3.18
Unaffected: 0 , < 3.18 (semver)
Unaffected: 5.10.227 , ≤ 5.10.* (semver)
Unaffected: 5.15.168 , ≤ 5.15.* (semver)
Unaffected: 6.1.113 , ≤ 6.1.* (semver)
Unaffected: 6.6.55 , ≤ 6.6.* (semver)
Unaffected: 6.10.14 , ≤ 6.10.* (semver)
Unaffected: 6.11.3 , ≤ 6.11.* (semver)
Unaffected: 6.12 , ≤ * (original_commit_for_fix)
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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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