CVE-2022-50428

MEDIUM EPSS 4.3%
Published Oct 1, 20259mo ago · Modified Jun 17, 20261w ago
5.5 CVSS 3.1
Medium
Find Similar
Published Oct 1, 2025 9mo ago
Last Modified Jun 17, 2026 1w ago

Description

In the Linux kernel, the following vulnerability has been resolved: ext4: fix off-by-one errors in fast-commit block filling Due to several different off-by-one errors, or perhaps due to a late change in design that wasn't fully reflected in the code that was actually merged, there are several very strange constraints on how fast-commit blocks are filled with tlv entries: - tlvs must start at least 10 bytes before the end of the block, even though the minimum tlv length is 8. Otherwise, the replay code will ignore them. (BUG: ext4_fc_reserve_space() could violate this requirement if called with a len of blocksize - 9 or blocksize - 8. Fortunately, this doesn't seem to happen currently.) - tlvs must end at least 1 byte before the end of the block. Otherwise the replay code will consider them to be invalid. This quirk contributed to a bug (fixed by an earlier commit) where uninitialized memory was being leaked to disk in the last byte of blocks. Also, strangely these constraints don't apply to the replay code in e2fsprogs, which will accept any tlvs in the blocks (with no bounds checks at all, but that is a separate issue...). Given that this all seems to be a bug, let's fix it by just filling blocks with tlv entries in the natural way. Note that old kernels will be unable to replay fast-commit journals created by kernels that have this commit.

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
4.3% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-193

Affected Products 3

VendorProductVersionRange
linuxlinux_kernel*≥5.10  –  <5.15.87
linuxlinux_kernel*≥5.16  –  <6.0.18
linuxlinux_kernel*≥6.1  –  <6.1.4

References 4

  • git.kernel.org https://git.kernel.org/stable/c/18f28f13301d1afb8cea9c4ddcecdbff14488ec6
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/48a6a66db82b8043d298a630f22c62d43550cae5
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/5439ad45c0d0c8db41eb6f4dce6f778f15a5ee16
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/5ca65dffdead16572ca046c43fb576b227f7f635
    Patch

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/18f28f13301d1afb8cea9c4ddcecdbff14488ec6
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/48a6a66db82b8043d298a630f22c62d43550cae5
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/5439ad45c0d0c8db41eb6f4dce6f778f15a5ee16
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/5ca65dffdead16572ca046c43fb576b227f7f635
    Patch