CVE - CVE-2024-49983

CVE-ID
CVE-2024-49983	Learn more at National Vulnerability Database (NVD) • CVSS Severity Rating • Fix Information • Vulnerable Software Versions • SCAP Mappings • CPE Information
Description
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.
References
Note: References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
MISC:https://git.kernel.org/stable/c/1b558006d98b7b0b730027be0ee98973dd10ee0d URL:https://git.kernel.org/stable/c/1b558006d98b7b0b730027be0ee98973dd10ee0d MISC:https://git.kernel.org/stable/c/3ff710662e8d86a63a39b334e9ca0cb10e5c14b0 URL:https://git.kernel.org/stable/c/3ff710662e8d86a63a39b334e9ca0cb10e5c14b0 MISC:https://git.kernel.org/stable/c/5c0f4cc84d3a601c99bc5e6e6eb1cbda542cce95 URL:https://git.kernel.org/stable/c/5c0f4cc84d3a601c99bc5e6e6eb1cbda542cce95 MISC:https://git.kernel.org/stable/c/6367d3f04c69e2b8770b8137bd800e0784b0abbc URL:https://git.kernel.org/stable/c/6367d3f04c69e2b8770b8137bd800e0784b0abbc MISC:https://git.kernel.org/stable/c/63adc9016917e6970fb0104ee5fd6770f02b2d80 URL:https://git.kernel.org/stable/c/63adc9016917e6970fb0104ee5fd6770f02b2d80 MISC:https://git.kernel.org/stable/c/8c26d9e53e5fbacda0732a577e97c5a5b7882aaf URL:https://git.kernel.org/stable/c/8c26d9e53e5fbacda0732a577e97c5a5b7882aaf MISC:https://git.kernel.org/stable/c/a34bed978364114390162c27e50fca50791c568d URL:https://git.kernel.org/stable/c/a34bed978364114390162c27e50fca50791c568d
Assigning CNA
kernel.org
Date Record Created
20241021	Disclaimer: The record creation date may reflect when the CVE ID was allocated or reserved, and does not necessarily indicate when this vulnerability was discovered, shared with the affected vendor, publicly disclosed, or updated in CVE.
Phase (Legacy)
Assigned (20241021)
Votes (Legacy)

Comments (Legacy)

Proposed (Legacy)
N/A
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