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CVE-2024-49889

ext4: avoid use-after-free in ext4_ext_show_leaf()

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 5.10.227, 5.15.168, 6.1.113, 6.6.55, 6.10.14, and 1 more
None on Exploit-DB, Metasploit or GitHub
  • Exploitation: none
  • Automatable: no
  • Technical impact: partial

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.

Timeline

  1. CVE published
  2. CISA SSVC assessment

    Exploitation: none · Automatable: no · Technical impact: partial

  3. Record last updated

Affected versions

  • Linux Linux

    From dfe5080939ea4686b3414b5d970a9b26733c57a4 · fixed in b0cb4561fc4284d04e69c8a66c8504928ab2484e; From dfe5080939ea4686b3414b5d970a9b26733c57a4 · fixed in 4999fed877bb64e3e7f9ab9996de2ca983c41928; From dfe5080939ea4686b3414b5d970a9b26733c57a4 · fixed in 2eba3b0cc5b8de624918d21f32b5b8db59a90b39; From dfe5080939ea4686b3414b5d970a9b26733c57a4 · fixed in 34b2096380ba475771971a778a478661a791aa15; From dfe5080939ea4686b3414b5d970a9b26733c57a4 · fixed in 8b114f2cc7dd5d36729d040b68432fbd0f0a8868; From dfe5080939ea4686b3414b5d970a9b26733c57a4 · fixed in d483c7cc1796bd6a80e7b3a8fd494996260f6b67; From dfe5080939ea4686b3414b5d970a9b26733c57a4 · fixed in 4e2524ba2ca5f54bdbb9e5153bea00421ef653f5

  • Linux Linux

    3.18

  • KernelLinux

    From 3.18.0 · fixed in 5.10.227; From 5.11.0 · fixed in 5.15.168; From 5.16.0 · fixed in 6.1.113; From 6.2.0 · fixed in 6.6.55; From 6.7.0 · fixed in 6.10.14; From 6.11.0 · fixed in 6.11.3

References 7

git.kernel.org