ext4: fix off-by-one errors in fast-commit block filling

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2022-50428
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2025-10-01 12:15:34 UTC
Updated2026-11-05 21:16:58 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 5.5 MEDIUM from [email protected]

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

Problem Types: CWE-193

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

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

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected aa75f4d3daaeb1389b9cce9d6b84401eaf228d4e 18f28f13301d1afb8cea9c4ddcecdbff14488ec6 git Not specified
CNA Linux Linux affected aa75f4d3daaeb1389b9cce9d6b84401eaf228d4e 5ca65dffdead16572ca046c43fb576b227f7f635 git Not specified
CNA Linux Linux affected aa75f4d3daaeb1389b9cce9d6b84401eaf228d4e 5439ad45c0d0c8db41eb6f4dce6f778f15a5ee16 git Not specified
CNA Linux Linux affected aa75f4d3daaeb1389b9cce9d6b84401eaf228d4e 48a6a66db82b8043d298a630f22c62d43550cae5 git Not specified
CNA Linux Linux affected 5.10 Not specified
CNA Linux Linux unaffected 5.10 semver Not specified
CNA Linux Linux unaffected 5.15.87 5.15.* semver Not specified
CNA Linux Linux unaffected 6.0.18 6.0.* semver Not specified
CNA Linux Linux unaffected 6.1.4 6.1.* semver Not specified
CNA Linux Linux unaffected 6.2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/18f28f13301d1afb8cea9c4ddcecdbff14488ec6 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/5ca65dffdead16572ca046c43fb576b227f7f635 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/48a6a66db82b8043d298a630f22c62d43550cae5 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/5439ad45c0d0c8db41eb6f4dce6f778f15a5ee16 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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