runc: LSM labels can be bypassed with malicious config using dummy procfs files
Summary
| CVE | CVE-2025-52881 |
|---|---|
| State | PUBLISHED |
| Assigner | GitHub_M |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2025-11-06 21:15:42 UTC |
| Updated | 2026-10-07 21:10:00 UTC |
| Description | runc is a CLI tool for spawning and running containers according to the OCI specification. In versions 1.2.7, 1.3.2 and 1.4.0-rc.2, an attacker can trick runc into misdirecting writes to /proc to other procfs files through the use of a racing container with shared mounts (we have also verified this attack is possible to exploit using a standard Dockerfile with docker buildx build as that also permits triggering parallel execution of containers with custom shared mounts configured). This redirect could be through symbolic links in a tmpfs or theoretically other methods such as regular bind-mounts. While similar, the mitigation applied for the related CVE, CVE-2019-19921, was fairly limited and effectively only caused runc to verify that when LSM labels are written they are actually procfs files. This issue is fixed in versions 1.2.8, 1.3.3, and 1.4.0-rc.3. |
Risk And Classification
Primary CVSS: v4.0 7.3 HIGH from [email protected]
CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:A/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Problem Types: CWE-61 | CWE-363 | CWE-61 CWE-61: UNIX Symbolic Link (Symlink) Following | CWE-363 CWE-363: Race Condition Enabling Link Following
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 4.0 | [email protected] | Secondary | 7.3 | HIGH | CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:A/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/C... |
| 4.0 | CNA | DECLARED | 7.3 | HIGH | CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:A/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H |
| 3.1 | [email protected] | Primary | 7.5 | HIGH | CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:H |
CVSS v4.0 Breakdown
Attack Vector
LocalAttack Complexity
LowAttack Requirements
PresentPrivileges Required
LowUser Interaction
ActiveConfidentiality
HighIntegrity
HighAvailability
HighSub Conf.
HighSub Integrity
HighSub Availability
HighCVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:A/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CVSS v3.1 Breakdown
Attack Vector
LocalAttack Complexity
HighPrivileges Required
LowUser Interaction
RequiredScope
ChangedConfidentiality
HighIntegrity
HighAvailability
HighCVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:H
NVD Known Affected Configurations (CPE 2.3)
| Type | Vendor | Product | Version | Update | Edition | Language |
|---|---|---|---|---|---|---|
| Application | Linuxfoundation | Runc | All | All | All | All |
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Opencontainers | Runc | affected <= 1.2.7, < 1.2.8 | Not specified |
| CNA | Opencontainers | Runc | affected <= 1.3.2, < 1.3.3 | Not specified |
| CNA | Opencontainers | Runc | affected <= 1.4.0-rc.2, < 1.4.0-rc.3 | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| github.com/opencontainers/runc/blob/v1.4.0-rc.2/RELEASES.md | [email protected] | github.com | Patch |
| github.com/opencontainers/runc/commit/d40b3439a9614a86e87b81a94c6811ec6f... | [email protected] | github.com | Patch |
| github.com/opencontainers/runc/commit/ff6fe1324663538167eca8b3d3eec61e1b... | [email protected] | github.com | Patch |
| github.com/opencontainers/runc/commit/fdcc9d3cad2f85954a241ccb910a61aaa1... | [email protected] | github.com | Patch |
| github.com/opencontainers/runc/commit/a41366e74080fa9f26a2cd3544e2801449... | [email protected] | github.com | Patch |
| github.com/opencontainers/runc/security/advisories/GHSA-cgrx-mc8f-2prm | [email protected] | github.com | Exploit, Mitigation, Patch, Third Party Advisory |
| github.com/opencontainers/runc/commit/b3dd1bc562ed9996d1a0f249e056c16624... | [email protected] | github.com | Patch |
| github.com/opencontainers/runc/commit/435cc81be6b79cdec73b4002c0dae549b2... | [email protected] | github.com | Patch |
| github.com/opencontainers/runc/commit/d61fd29d854b416feaaf128bf650325cd2... | [email protected] | github.com | Patch |
| github.com/opencontainers/runc/commit/77889b56db939c323d29d1130f28f9aea2... | [email protected] | github.com | Patch |
| github.com/opencontainers/runc/commit/3f925525b44d247e390e529e772a0dc0c0... | [email protected] | github.com | Patch |
| github.com/opencontainers/runc/commit/77d217c7c3775d8ca5af89e477e81568ef... | [email protected] | github.com | Patch |
| github.com/opencontainers/runc/commit/ed6b1693b8b3ae7eb0250a7e76fc888cda... | [email protected] | github.com | Patch |
| github.com/opencontainers/runc/security/advisories/GHSA-qw9x-cqr3-wc7r | [email protected] | github.com | Patch, Third Party Advisory |
| github.com/opencontainers/runc/security/advisories/GHSA-9493-h29p-rfm2 | [email protected] | github.com | Patch, Third Party Advisory |
| github.com/opencontainers/runc/commit/4b37cd93f86e72feac866442988b549b5b... | [email protected] | github.com | Patch |
| github.com/opencontainers/runc/commit/6fc191449109ea14bb7d61238f24a33fe0... | [email protected] | github.com | Patch |
| github.com/opencontainers/runc/commit/ff94f9991bd32076c871ef0ad8bc1b7634... | [email protected] | github.com | Patch |
| github.com/opencontainers/runc/commit/44a0fcf685db051c80b8c269812bb177f5... | [email protected] | github.com | Patch |
| github.com/opencontainers/runc/commit/db19bbed5348847da433faa9d69e9f9019... | [email protected] | github.com | 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.
There are currently no legacy QID mappings associated with this CVE.