ceph: prevent use-after-free in encode_cap_msg()
Summary
| CVE | CVE-2024-26689 |
|---|---|
| State | PUBLISHED |
| Assigner | Linux |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2024-04-03 15:15:52 UTC |
| Updated | 2026-08-04 11:16:56 UTC |
| Description | In the Linux kernel, the following vulnerability has been resolved: ceph: prevent use-after-free in encode_cap_msg() In fs/ceph/caps.c, in encode_cap_msg(), "use after free" error was caught by KASAN at this line - 'ceph_buffer_get(arg->xattr_buf);'. This implies before the refcount could be increment here, it was freed. In same file, in "handle_cap_grant()" refcount is decremented by this line - 'ceph_buffer_put(ci->i_xattrs.blob);'. It appears that a race occurred and resource was freed by the latter line before the former line could increment it. encode_cap_msg() is called by __send_cap() and __send_cap() is called by ceph_check_caps() after calling __prep_cap(). __prep_cap() is where arg->xattr_buf is assigned to ci->i_xattrs.blob. This is the spot where the refcount must be increased to prevent "use after free" error. |
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-416
| 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 | 8.8 | HIGH | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| 3.1 | CNA | DECLARED | 8.8 | HIGH | CVSS:3.1/AV:N/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 9030aaf9bf0a1eee47a154c316c789e959638b0f 8180d0c27b93a6eb60da1b08ea079e3926328214 git | Not specified |
| CNA | Linux | Linux | affected 9030aaf9bf0a1eee47a154c316c789e959638b0f 70e329b440762390258a6fe8c0de93c9fdd56c77 git | Not specified |
| CNA | Linux | Linux | affected 9030aaf9bf0a1eee47a154c316c789e959638b0f f3f98d7d84b31828004545e29fd7262b9f444139 git | Not specified |
| CNA | Linux | Linux | affected 9030aaf9bf0a1eee47a154c316c789e959638b0f ae20db45e482303a20e56f2db667a9d9c54ac7e7 git | Not specified |
| CNA | Linux | Linux | affected 9030aaf9bf0a1eee47a154c316c789e959638b0f 7958c1bf5b03c6f1f58e724dbdec93f8f60b96fc git | Not specified |
| CNA | Linux | Linux | affected 9030aaf9bf0a1eee47a154c316c789e959638b0f cda4672da1c26835dcbd7aec2bfed954eda9b5ef git | Not specified |
| CNA | Linux | Linux | affected 2.6.34 | Not specified |
| CNA | Linux | Linux | unaffected 2.6.34 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/ae20db45e482303a20e56f2db667a9d9c54ac7e7 | 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/70e329b440762390258a6fe8c0de93c9fdd56c77 | af854a3a-2127-422b-91ae-364da2661108 | git.kernel.org | Patch |
| git.kernel.org/stable/c/cda4672da1c26835dcbd7aec2bfed954eda9b5ef | af854a3a-2127-422b-91ae-364da2661108 | git.kernel.org | Patch |
| git.kernel.org/stable/c/7958c1bf5b03c6f1f58e724dbdec93f8f60b96fc | af854a3a-2127-422b-91ae-364da2661108 | git.kernel.org | Patch |
| git.kernel.org/stable/c/8180d0c27b93a6eb60da1b08ea079e3926328214 | af854a3a-2127-422b-91ae-364da2661108 | git.kernel.org | Patch |
| git.kernel.org/stable/c/f3f98d7d84b31828004545e29fd7262b9f444139 | af854a3a-2127-422b-91ae-364da2661108 | git.kernel.org | Patch |
| 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)