ext4: fix double-free of blocks due to wrong extents moved_len
Summary
| CVE | CVE-2024-26704 |
|---|---|
| State | PUBLISHED |
| Assigner | Linux |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2024-04-03 15:15:53 UTC |
| Updated | 2026-08-04 11:16:57 UTC |
| Description | In the Linux kernel, the following vulnerability has been resolved: ext4: fix double-free of blocks due to wrong extents moved_len In ext4_move_extents(), moved_len is only updated when all moves are successfully executed, and only discards orig_inode and donor_inode preallocations when moved_len is not zero. When the loop fails to exit after successfully moving some extents, moved_len is not updated and remains at 0, so it does not discard the preallocations. If the moved extents overlap with the preallocated extents, the overlapped extents are freed twice in ext4_mb_release_inode_pa() and ext4_process_freed_data() (as described in commit 94d7c16cbbbd ("ext4: Fix double-free of blocks with EXT4_IOC_MOVE_EXT")), and bb_free is incremented twice. Hence when trim is executed, a zero-division bug is triggered in mb_update_avg_fragment_size() because bb_free is not zero and bb_fragments is zero. Therefore, update move_len after each extent move to avoid the issue. |
Risk And Classification
Primary CVSS: v3.1 7.8 HIGH from [email protected]
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Problem Types: CWE-415
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 3.1 | [email protected] | Primary | 7.8 | HIGH | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| 3.1 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | Secondary | 7.8 | HIGH | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| 3.1 | CNA | DECLARED | 7.8 | HIGH | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
CVSS v3.1 Breakdown
Attack Vector
LocalAttack Complexity
LowPrivileges Required
LowUser Interaction
NoneScope
UnchangedConfidentiality
HighIntegrity
HighAvailability
HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
NVD Known Affected Configurations (CPE 2.3)
| Type | Vendor | Product | Version | Update | Edition | Language |
|---|---|---|---|---|---|---|
| Operating System | Linux | Linux Kernel | All | All | All | All |
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Linux | Linux | affected fcf6b1b729bcd23f2b49a84fb33ffbb44712ee6a b4fbb89d722cbb16beaaea234b7230faaaf68c71 git | Not specified |
| CNA | Linux | Linux | affected fcf6b1b729bcd23f2b49a84fb33ffbb44712ee6a afbcad9ae7d6d11608399188f03a837451b6b3a1 git | Not specified |
| CNA | Linux | Linux | affected fcf6b1b729bcd23f2b49a84fb33ffbb44712ee6a d033a555d9a1cf53dbf3301af7199cc4a4c8f537 git | Not specified |
| CNA | Linux | Linux | affected fcf6b1b729bcd23f2b49a84fb33ffbb44712ee6a afba9d11320dad5ce222ac8964caf64b7b4bedb1 git | Not specified |
| CNA | Linux | Linux | affected fcf6b1b729bcd23f2b49a84fb33ffbb44712ee6a 185eab30486ba3e7bf8b9c2e049c79a06ffd2bc1 git | Not specified |
| CNA | Linux | Linux | affected fcf6b1b729bcd23f2b49a84fb33ffbb44712ee6a 2883940b19c38d5884c8626483811acf4d7e148f git | Not specified |
| CNA | Linux | Linux | affected fcf6b1b729bcd23f2b49a84fb33ffbb44712ee6a 559ddacb90da1d8786dd8ec4fd76bbfa404eaef6 git | Not specified |
| CNA | Linux | Linux | affected fcf6b1b729bcd23f2b49a84fb33ffbb44712ee6a 55583e899a5357308274601364741a83e78d6ac4 git | Not specified |
| CNA | Linux | Linux | affected 3.18 | Not specified |
| CNA | Linux | Linux | unaffected 3.18 semver | Not specified |
| CNA | Linux | Linux | unaffected 4.19.307 4.19.* semver | Not specified |
| CNA | Linux | Linux | unaffected 5.4.269 5.4.* semver | Not specified |
| CNA | Linux | Linux | unaffected 5.10.210 5.10.* semver | Not specified |
| CNA | Linux | Linux | unaffected 5.15.149 5.15.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.1.79 6.1.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.6.18 6.6.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.7.6 6.7.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.8 * original_commit_for_fix | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| git.kernel.org/stable/c/afbcad9ae7d6d11608399188f03a837451b6b3a1 | af854a3a-2127-422b-91ae-364da2661108 | git.kernel.org | Patch |
| lists.debian.org/debian-lts-announce/2024/06/msg00017.html | af854a3a-2127-422b-91ae-364da2661108 | lists.debian.org | Mailing List |
| git.kernel.org/stable/c/55583e899a5357308274601364741a83e78d6ac4 | af854a3a-2127-422b-91ae-364da2661108 | git.kernel.org | Patch |
| git.kernel.org/stable/c/b4fbb89d722cbb16beaaea234b7230faaaf68c71 | af854a3a-2127-422b-91ae-364da2661108 | git.kernel.org | Patch |
| git.kernel.org/stable/c/afba9d11320dad5ce222ac8964caf64b7b4bedb1 | af854a3a-2127-422b-91ae-364da2661108 | git.kernel.org | Patch |
| git.kernel.org/stable/c/d033a555d9a1cf53dbf3301af7199cc4a4c8f537 | af854a3a-2127-422b-91ae-364da2661108 | git.kernel.org | Patch |
| git.kernel.org/stable/c/185eab30486ba3e7bf8b9c2e049c79a06ffd2bc1 | af854a3a-2127-422b-91ae-364da2661108 | git.kernel.org | Patch |
| git.kernel.org/stable/c/559ddacb90da1d8786dd8ec4fd76bbfa404eaef6 | af854a3a-2127-422b-91ae-364da2661108 | git.kernel.org | Patch |
| git.kernel.org/stable/c/2883940b19c38d5884c8626483811acf4d7e148f | af854a3a-2127-422b-91ae-364da2661108 | git.kernel.org | Patch |
| lists.debian.org/debian-lts-announce/2024/06/msg00020.html | af854a3a-2127-422b-91ae-364da2661108 | lists.debian.org | Mailing List |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
No vendor comments have been submitted for this CVE.
Legacy QID Mappings
- 6000567 Debian Security Update for linux (DSA 5658-1)