CVE-2024-50015

MEDIUM EPSS 14.0%
Published Oct 21, 20241y ago · Modified Jun 17, 20261w ago
5.5 CVSS 3.1
Medium
Find Similar
Published Oct 21, 2024 1y ago
Last Modified Jun 17, 2026 1w ago

Description

In the Linux kernel, the following vulnerability has been resolved: ext4: dax: fix overflowing extents beyond inode size when partially writing The dax_iomap_rw() does two things in each iteration: map written blocks and copy user data to blocks. If the process is killed by user(See signal handling in dax_iomap_iter()), the copied data will be returned and added on inode size, which means that the length of written extents may exceed the inode size, then fsck will fail. An example is given as: dd if=/dev/urandom of=file bs=4M count=1 dax_iomap_rw iomap_iter // round 1 ext4_iomap_begin ext4_iomap_alloc // allocate 0~2M extents(written flag) dax_iomap_iter // copy 2M data iomap_iter // round 2 iomap_iter_advance iter->pos += iter->processed // iter->pos = 2M ext4_iomap_begin ext4_iomap_alloc // allocate 2~4M extents(written flag) dax_iomap_iter fatal_signal_pending done = iter->pos - iocb->ki_pos // done = 2M ext4_handle_inode_extension ext4_update_inode_size // inode size = 2M fsck reports: Inode 13, i_size is 2097152, should be 4194304. Fix? Fix the problem by truncating extents if the written length is smaller than expected.

CVSS Details

Base Score
5.5
Exploitability
1.8
Impact
3.6
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High

Threat Intelligence

EPSS Exploit Probability
14.0% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Affected Products 6

VendorProductVersionRange
linuxlinux_kernel*≥4.10  –  <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 11

  • cert-portal.siemens.com https://cert-portal.siemens.com/productcert/html/ssa-265688.html
  • cert-portal.siemens.com https://cert-portal.siemens.com/productcert/html/ssa-355557.html
  • git.kernel.org https://git.kernel.org/stable/c/5efccdee4a7d507a483f20f880b809cc4eaef14d
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/8c30a9a8610c314554997f86370140746aa35661
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/a9f331f51515bdb3ebc8d0963131af367ef468f6
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/abfaa876b948baaea4d14f21a1963789845c8b4c
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/dda898d7ffe85931f9cca6d702a51f33717c501e
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/ec0dd451e236c46e4858d53e9e82bae7797a7af5
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/f8a7c342326f6ad1dfdb30a18dd013c70f5e9669
    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/5efccdee4a7d507a483f20f880b809cc4eaef14d
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/8c30a9a8610c314554997f86370140746aa35661
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/a9f331f51515bdb3ebc8d0963131af367ef468f6
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/abfaa876b948baaea4d14f21a1963789845c8b4c
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/dda898d7ffe85931f9cca6d702a51f33717c501e
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/ec0dd451e236c46e4858d53e9e82bae7797a7af5
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/f8a7c342326f6ad1dfdb30a18dd013c70f5e9669
    Patch