CVE-2026-12505Cifs-utils: local privilege escalation via forged cifs.spnego key description in cifs.upcall
Updated under an hour ago ()
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It affects Red Hat Enterprise Linux 10 and 1 other product. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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Free account, 1 product
A flaw was found in the cifs-utils package where the cifs.upcall helper fails to securely drop its root privileges before looking up user information inside a user-controlled environment. A local, low privileged attacker can exploit this by using a crafted request_key payload to trick the root-owned helper into entering a custom environment (namespace) containing a malicious NSS module. This forces the system to load the attacker's controlled NSS Module and configuration, allowing them to execute arbitrary commands as the root user, elevating their privileges and fully compromising the system.
- CVSS
- 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- CWE-250
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- redhat
- NVD analysis
- Awaiting Analysis
- Record last updated
- Oct 14, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Red Hat Red Hat Enterprise Linux 10 redhat:enterprise_linux | from 0:7.6-1.el10_2 not affected | CNA record |
Red Hat Red Hat OpenShift Container Platform 4.22 redhat:openshift | from 4.22.9.8.202607220526-0 not affected | CNA record |
Red Hat Red Hat Enterprise Linux 10 redhat:enterprise_linux | from 0:7.6-1.el10_2 not affected | CISA ADP |
Red Hat Red Hat OpenShift Container Platform 4.22 redhat:openshift | from 4.22.9.8.202607220526-0 not affected | CISA ADP |
References
- https://access.redhat.com/errata/RHSA-2026:32990vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:39575vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:39576vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:44232vendor-advisory, x-refsource-redhat
- https://access.redhat.com/security/cve/CVE-2026-12505vdb-entry, x-refsource-redhat
- https://bugzilla.redhat.com/show_bug.cgi?id=2489805issue-tracking, x-refsource-redhat
- https://git.samba.org/?p=cifs-utils.git;a=commit;h=972c5b5ff95e3e812bc8daa72d0383654ab0dba7
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-12505.json
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.