CVE-2024-49983
Linux Kernel: Double Free in ext4
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.
INFO
Published Date :
Oct. 21, 2024, 6:15 p.m.
Last Modified :
Oct. 29, 2024, 4:23 p.m.
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Remotely Exploitable :
No
Impact Score :
5.9
Exploitability Score :
1.8
References to Advisories, Solutions, and Tools
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CVE-2024-49983.
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The following list is the news that have been mention
CVE-2024-49983 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2024-49983 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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Initial Analysis by [email protected]
Oct. 29, 2024
Action Type Old Value New Value Added CVSS V3.1 NIST AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Changed Reference Type https://git.kernel.org/stable/c/1b558006d98b7b0b730027be0ee98973dd10ee0d No Types Assigned https://git.kernel.org/stable/c/1b558006d98b7b0b730027be0ee98973dd10ee0d Patch Changed Reference Type https://git.kernel.org/stable/c/3ff710662e8d86a63a39b334e9ca0cb10e5c14b0 No Types Assigned https://git.kernel.org/stable/c/3ff710662e8d86a63a39b334e9ca0cb10e5c14b0 Patch Changed Reference Type https://git.kernel.org/stable/c/5c0f4cc84d3a601c99bc5e6e6eb1cbda542cce95 No Types Assigned https://git.kernel.org/stable/c/5c0f4cc84d3a601c99bc5e6e6eb1cbda542cce95 Patch Changed Reference Type https://git.kernel.org/stable/c/6367d3f04c69e2b8770b8137bd800e0784b0abbc No Types Assigned https://git.kernel.org/stable/c/6367d3f04c69e2b8770b8137bd800e0784b0abbc Patch Changed Reference Type https://git.kernel.org/stable/c/63adc9016917e6970fb0104ee5fd6770f02b2d80 No Types Assigned https://git.kernel.org/stable/c/63adc9016917e6970fb0104ee5fd6770f02b2d80 Patch Changed Reference Type https://git.kernel.org/stable/c/8c26d9e53e5fbacda0732a577e97c5a5b7882aaf No Types Assigned https://git.kernel.org/stable/c/8c26d9e53e5fbacda0732a577e97c5a5b7882aaf Patch Changed Reference Type https://git.kernel.org/stable/c/a34bed978364114390162c27e50fca50791c568d No Types Assigned https://git.kernel.org/stable/c/a34bed978364114390162c27e50fca50791c568d Patch Added CWE NIST CWE-415 Added CPE Configuration OR *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.10 up to (excluding) 5.10.227 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.11 up to (excluding) 5.15.168 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.16 up to (excluding) 6.1.113 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.2 up to (excluding) 6.6.55 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.7 up to (excluding) 6.10.14 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.11 up to (excluding) 6.11.3 -
CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Oct. 21, 2024
Action Type Old Value New Value Added 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. Added Reference kernel.org https://git.kernel.org/stable/c/8c26d9e53e5fbacda0732a577e97c5a5b7882aaf [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/a34bed978364114390162c27e50fca50791c568d [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/6367d3f04c69e2b8770b8137bd800e0784b0abbc [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/1b558006d98b7b0b730027be0ee98973dd10ee0d [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/3ff710662e8d86a63a39b334e9ca0cb10e5c14b0 [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/63adc9016917e6970fb0104ee5fd6770f02b2d80 [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/5c0f4cc84d3a601c99bc5e6e6eb1cbda542cce95 [No types assigned]
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2024-49983 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2024-49983
weaknesses.