CVE-2024-49983: ext4: drop ppath from ext4_ext_replay_update_ex() to avoid double-free
First published: Mon Oct 21 2024(Updated: )
In the Linux kernel, the following vulnerability has been resolved: ext4: drop ppath from ext4_ext_replay_update_ex() to avoid double-free When calling ext4_force_split_extent_at() in ext4_ext_replay_update_ex(), the 'ppath' is updated but it is the 'path' that is freed, thus potentially triggering a double-free in the following process: ext4_ext_replay_update_ex ppath = path ext4_force_split_extent_at(&ppath) ext4_split_extent_at ext4_ext_insert_extent ext4_ext_create_new_leaf ext4_ext_grow_indepth ext4_find_extent if (depth > path[0].p_maxdepth) kfree(path) ---> path First freed *orig_path = path = NULL ---> null ppath kfree(path) ---> path double-free !!! So drop the unnecessary ppath and use path directly to avoid this problem. And use ext4_find_extent() directly to update path, avoiding unnecessary memory allocation and freeing. Also, propagate the error returned by ext4_find_extent() instead of using strange error codes.
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Linux kernel | >=5.10<5.10.227 | |
| Linux Linux kernel | >=5.11<5.15.168 | |
| Linux Linux kernel | >=5.16<6.1.113 | |
| Linux Linux kernel | >=6.2<6.6.55 | |
| Linux Linux kernel | >=6.7<6.10.14 | |
| Linux Linux kernel | >=6.11<6.11.3 | |
| debian/linux | <=5.10.223-1<=5.10.226-1 | 6.1.115-1 6.1.119-1 6.12.6-1 6.12.9-1 |
| debian/linux-6.1 | 6.1.119-1~deb11u1 |
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Reference Links
- https://git.kernel.org/stable/c/1b558006d98b7b0b730027be0ee98973dd10ee0d
- https://git.kernel.org/stable/c/3ff710662e8d86a63a39b334e9ca0cb10e5c14b0
- https://git.kernel.org/stable/c/5c0f4cc84d3a601c99bc5e6e6eb1cbda542cce95
- https://git.kernel.org/stable/c/6367d3f04c69e2b8770b8137bd800e0784b0abbc
- https://git.kernel.org/stable/c/63adc9016917e6970fb0104ee5fd6770f02b2d80
- https://git.kernel.org/stable/c/8c26d9e53e5fbacda0732a577e97c5a5b7882aaf
- https://git.kernel.org/stable/c/a34bed978364114390162c27e50fca50791c568d
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-49983
- https://nvd.nist.gov/vuln/detail/CVE-2024-49983
- https://launchpad.net/bugs/cve/CVE-2024-49983
- https://security-tracker.debian.org/tracker/CVE-2024-49983
- https://ubuntu.com/security/CVE-2024-49983
- https://git.kernel.org/linus/5c0f4cc84d3a601c99bc5e6e6eb1cbda542cce95
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