cve-2026-4878
MEDIUM CVSS 6.7 nvd
Description
A flaw was found in libcap. A local unprivileged user can exploit a Time-of-check-to-time-of-use (TOCTOU) race condition in the `cap_set_file()` function. This allows an attacker with write access to a parent directory to redirect file capability updates to an attacker-controlled file. By doing so, capabilities can be injected into or stripped from unintended executables, leading to privilege escalation.
Timeline
- Published
- 2026-04-09
- Last Modified
- 2026-09-09
CVSS Details
- Attack Vector
- LOCAL
- Attack Complexity
- HIGH
- Privileges Required
- LOW
Affected Products
- libcap_project libcap
- redhat openshift_container_platform
- redhat enterprise_linux
Weaknesses (CWE)
CVSS metrics
| Version | Base | Severity | Vector | Exploitability | Impact | Source |
|---|---|---|---|---|---|---|
| 3.1 | 6.7 | MEDIUM | CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H |
0.8 | 5.9 | secalert@redhat.com |
| 3.1 | 7.0 | HIGH | CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H |
1.0 | 5.9 | nvd@nist.gov |
| 3.1 | 6.7 | MEDIUM | CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H |
0.8 | 5.9 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c |
CPE configurations
OR
| CPE | Version range | Vulnerable |
|---|---|---|
cpe:2.3:a:libcap_project:libcap:-:*:*:*:*:*:*:* |
— | yes |
cpe:2.3:a:redhat:openshift_container_platform:4.0:*:*:*:*:*:*:* |
— | yes |
cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:* |
— | yes |
cpe:2.3:o:redhat:enterprise_linux:9.0:*:*:*:*:*:*:* |
— | yes |
cpe:2.3:o:redhat:enterprise_linux:10.0:*:*:*:*:*:*:* |
— | yes |
NVD metadata
- NVD status
- Modified
- Source identifier
secalert@redhat.com
References
- https://access.redhat.com/errata/RHSA-2026:12423
- https://access.redhat.com/errata/RHSA-2026:12441
- https://access.redhat.com/errata/RHSA-2026:13285
- https://access.redhat.com/errata/RHSA-2026:14162
- https://access.redhat.com/errata/RHSA-2026:14937
- https://access.redhat.com/errata/RHSA-2026:19130
- https://access.redhat.com/errata/RHSA-2026:19346
- https://access.redhat.com/errata/RHSA-2026:19456
- https://access.redhat.com/errata/RHSA-2026:19458
- https://access.redhat.com/errata/RHSA-2026:20595
- https://access.redhat.com/errata/RHSA-2026:21254
- https://access.redhat.com/errata/RHSA-2026:21275
- https://access.redhat.com/errata/RHSA-2026:22634
- https://access.redhat.com/errata/RHSA-2026:22957
- https://access.redhat.com/errata/RHSA-2026:23233
- https://access.redhat.com/errata/RHSA-2026:23245
- https://access.redhat.com/errata/RHSA-2026:24346
- https://access.redhat.com/errata/RHSA-2026:25044
- https://access.redhat.com/errata/RHSA-2026:25096
- https://access.redhat.com/errata/RHSA-2026:25181
- https://access.redhat.com/errata/RHSA-2026:26542
- https://access.redhat.com/errata/RHSA-2026:27998
- https://access.redhat.com/errata/RHSA-2026:28887
- https://access.redhat.com/errata/RHSA-2026:29197
- https://access.redhat.com/errata/RHSA-2026:30078
- https://access.redhat.com/errata/RHSA-2026:30087
- https://access.redhat.com/errata/RHSA-2026:30088
- https://access.redhat.com/errata/RHSA-2026:30089
- https://access.redhat.com/errata/RHSA-2026:34098
- https://access.redhat.com/errata/RHSA-2026:39981
- https://access.redhat.com/errata/RHSA-2026:58981
- https://access.redhat.com/errata/RHSA-2026:59831
- https://access.redhat.com/errata/RHSA-2026:7473 Vendor Advisory
- https://access.redhat.com/security/cve/CVE-2026-4878 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2447554 Permissions Required
- https://bugzilla.redhat.com/show_bug.cgi?id=2451615 Issue Tracking, Vendor Advisory
- http://www.openwall.com/lists/oss-security/2026/04/07/14 Mailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2026/04/07/4 Mailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2026/04/08/9 Mailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2026/04/09/5 Exploit, Mailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2026/04/09/6 Exploit, Mailing List, Third Party Advisory
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-4878.json
Linked Vulnerabilities
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"dateUpdated": "2026-09-09T13:20:24.613",
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"severity": "MEDIUM",
"source": "nvd",
"title": "A flaw was found in libcap"
}