CVE-2024-49983

Oct. 29, 2024, 4:23 p.m.

7.8
High

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.

Product(s) Impacted

Vendor Product Versions
Linux
  • Linux Kernel
  • *

Weaknesses

Common security weaknesses mapped to this vulnerability.

CWE-415
Double Free
The product calls free() twice on the same memory address, potentially leading to modification of unexpected memory locations.

*CPE(s)

Affected systems and software identified for this CVE.

Type Vendor Product Version Update Edition Language Software Edition Target Software Target Hardware Other Information
o linux linux_kernel / / / / / / / /
o linux linux_kernel / / / / / / / /
o linux linux_kernel / / / / / / / /
o linux linux_kernel / / / / / / / /
o linux linux_kernel / / / / / / / /
o linux linux_kernel / / / / / / / /

References

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

Tags

416baaa9-dc9f-4396-8d5f-8c081fb06d67
CWE-415
2024-10-21
CVE-2024-49983

CVSS Score

7.8 / 10

CVSS Data - 3.1

  • Attack Vector: LOCAL
  • Attack Complexity: LOW
  • Privileges Required: LOW
  • Scope: UNCHANGED
  • Confidentiality Impact: HIGH
  • Integrity Impact: HIGH
  • Availability Impact: HIGH

    • CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

    View Vector String

Timeline

Published: Oct. 21, 2024, 6:15 p.m.
Last Modified: Oct. 29, 2024, 4:23 p.m.

Status : Analyzed

CVE has been recently published to the CVE List and has been received by the NVD.

More info

Source

416baaa9-dc9f-4396-8d5f-8c081fb06d67

*Disclaimer: Some vulnerabilities do not have an associated CPE. To enhance the data, we use AI to infer CPEs based on CVE details. This is an automated process and might not always be accurate.