CVE-2024-49983

HIGH EPSS 16.1%
Published Oct 21, 20241y ago · Modified Jun 17, 20262w ago
7.8 CVSS 3.1
High
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Published Oct 21, 2024 1y ago
Last Modified Jun 17, 2026 2w ago

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.

CVSS Details

Base Score
7.8
Exploitability
1.8
Impact
5.9
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality High
Integrity High
Availability High

Threat Intelligence

EPSS Exploit Probability
16.1% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-415

Affected Products 6

VendorProductVersionRange
linuxlinux_kernel*≥5.10  –  <5.10.227
linuxlinux_kernel*≥5.11  –  <5.15.168
linuxlinux_kernel*≥5.16  –  <6.1.113
linuxlinux_kernel*≥6.2  –  <6.6.55
linuxlinux_kernel*≥6.7  –  <6.10.14
linuxlinux_kernel*≥6.11  –  <6.11.3

References 9

  • git.kernel.org https://git.kernel.org/stable/c/1b558006d98b7b0b730027be0ee98973dd10ee0d
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/3ff710662e8d86a63a39b334e9ca0cb10e5c14b0
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/5c0f4cc84d3a601c99bc5e6e6eb1cbda542cce95
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/6367d3f04c69e2b8770b8137bd800e0784b0abbc
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/63adc9016917e6970fb0104ee5fd6770f02b2d80
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/8c26d9e53e5fbacda0732a577e97c5a5b7882aaf
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/a34bed978364114390162c27e50fca50791c568d
    Patch
  • lists.debian.org https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html
  • lists.debian.org https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/1b558006d98b7b0b730027be0ee98973dd10ee0d
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/3ff710662e8d86a63a39b334e9ca0cb10e5c14b0
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/5c0f4cc84d3a601c99bc5e6e6eb1cbda542cce95
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/6367d3f04c69e2b8770b8137bd800e0784b0abbc
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/63adc9016917e6970fb0104ee5fd6770f02b2d80
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/8c26d9e53e5fbacda0732a577e97c5a5b7882aaf
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/a34bed978364114390162c27e50fca50791c568d
    Patch