{"id":"CVE-2026-46243","title":"In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: reject userspace cifs.spnego descriptions\n\ncifs.spnego key descriptions contain authority-bearing fields such as\npid, uid, creduid, and upcall_target that …","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: reject userspace cifs.spnego descriptions\n\ncifs.spnego key descriptions contain authority-bearing fields such as\npid, uid, creduid, and upcall_target that …","severity":"high","cvss":7.1,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N","cwe":["CWE-20","CWE-825"],"vendor":"linux","product":"linux_kernel","affected":["linux_kernel >= 2.6.24.1, < 5.10.258","linux_kernel >= 5.11, < 5.15.209","linux_kernel >= 5.16, < 6.1.175","linux_kernel >= 6.2, < 6.6.142","linux_kernel >= 6.7, < 6.12.92","linux_kernel >= 6.13, < 6.18.34","linux_kernel >= 6.19, < 7.0.11","linux_kernel = 2.6.24","linux_kernel = 7.1"],"patched":["linux_kernel 7.0.11"],"published":"2026-06-01","updated":"2026-10-15","sourceUpdated":"2026-10-15T02:19:51.103","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-46243","references":[{"url":"https://git.kernel.org/stable/c/0aece6685fc80a8de492688ca2315fb86ec379c7","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/2035acfb17221729b1b8ac335e941868a04ca079","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/3da1fdf4efbc490041eb4f836bf596201203f8f2","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/7713bd320ed4fc3d08a227cd8e41242219a16981","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/91f89c1d83e80417629791fcef6af8140d7d01c8","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/9544559e59438a4b609b2fdfa0763d8360572824","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/a3bbda6502a9398b816fa2e71c9a3f955f58013d","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/cf20038657d6d4974349556a34e08fe0490bebbc","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"http://www.openwall.com/lists/oss-security/2026/06/01/6","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://access.redhat.com/errata/RHSA-2026:23258","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:23259","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:23329","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:23395","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:24381","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:25908","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:26462","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:26515","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:26535","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:26563","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:26570","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:27708","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:27719","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:27729","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:27735","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:28887","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:28962","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:33219","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:33220","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:33221","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:33222","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:33223","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:33224","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:33225","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:33486","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:34048","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:34757","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:34764","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:34788","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:34815","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:36620","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:40021","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:41236","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:47727","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/security/cve/CVE-2026-46243","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2481486","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://cert-portal.siemens.com/productcert/html/ssa-784472.html","label":"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"},{"url":"https://github.com/manizada/CIFSwitch","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-46243.json","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/security/vulnerabilities/RHSB-2026-005"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-46243"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-46243"},{"url":"https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=3da1fdf4efbc490041eb4f836bf596201203f8f2"},{"url":"https://lore.kernel.org/linux-cve-announce/2026060140-CVE-2026-46243-3d1c@gregkh/"}],"tags":["nvd","exploit-available","csaf","vex","red-hat","cve.org"],"epss":0.00413,"epssPercentile":0.35367,"exploits":{"github":5,"githubRepos":["https://github.com/MrForkBomb/CIFSwitch-Checker-CVE-2026-46243","https://github.com/suominen/cifswitch","https://github.com/Koshmare-Blossom/CIFSwitch-go"],"checkedAt":"2026-10-27T19:00:46.779Z"},"exploitAvailable":true,"scores":{"nvd":7.1,"vendor":7.8,"cna":7.1},"ingestedAt":"2026-07-06T17:44:51.168Z","ssvc":{"exploitation":"poc","automatable":"no","technicalImpact":"total","timestamp":"2026-06-01T00:00:00+00:00"},"slug":"CVE-2026-46243","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: reject userspace cifs.spnego descriptions\n\ncifs.spnego key descriptions contain authority-bearing fields such as\npid, uid, creduid, and upcall_target that cifs.upcall treats as\nkernel-originating inputs. However, userspace can also create keys of\nthis type through request_key(2) or add_key(2), allowing those fields to\nbe supplied without CIFS origin.\n\nOnly accept cifs.spnego descriptions while CIFS is using its private\nspnego_cred to request the key.\n\n## Affected\n\n- `linux_kernel >= 2.6.24.1, < 5.10.258`\n- `linux_kernel >= 5.11, < 5.15.209`\n- `linux_kernel >= 5.16, < 6.1.175`\n- `linux_kernel >= 6.2, < 6.6.142`\n- `linux_kernel >= 6.7, < 6.12.92`\n- `linux_kernel >= 6.13, < 6.18.34`\n- `linux_kernel >= 6.19, < 7.0.11`\n- `linux_kernel = 2.6.24`\n- `linux_kernel = 7.1`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `linux_kernel 7.0.11`\n\n## Vendor advisories\n\n- **RHSA-2026:23395** · Red Hat · fixed in: NVIDIA for RHEL 10 · released 2026-06-04 · [advisory](https://access.redhat.com/errata/RHSA-2026:23395)\n- **RHSA-2026:33486** · Red Hat · fixed in: NVIDIA for RHEL 10 · released 2026-06-30 · [advisory](https://access.redhat.com/errata/RHSA-2026:33486)\n- **RHSA-2026:27719** · Red Hat · fixed in: Red Hat Enterprise Linux Server -EXTENSION(v. 6 ELS-EXTENSION), Red Hat Enterprise Linux Server Optional -EXTENSION (v. 6 ELS -EXTENSION) · released 2026-06-22 · [advisory](https://access.redhat.com/errata/RHSA-2026:27719)\n- **RHSA-2026:27729** · Red Hat · fixed in: Red Hat Enterprise Linux Server (v. 7 ELS), Red Hat Enterprise Linux Server Optional (v. 7 ELS) · released 2026-06-22 · [advisory](https://access.redhat.com/errata/RHSA-2026:27729)\n- **RHSA-2026:41236** · Red Hat · fixed in: Red Hat Enterprise Linux for Real Time (v. 7 ELS) · released 2026-07-17 · [advisory](https://access.redhat.com/errata/RHSA-2026:41236)\n- **RHSA-2026:34048** · Red Hat · fixed in: Red Hat OpenShift Container Platform 4.12 · released 2026-07-09 · [advisory](https://access.redhat.com/errata/RHSA-2026:34048)\n- **RHSA-2026:40021** · Red Hat · fixed in: Red Hat OpenShift Container Platform 4.13 · released 2026-07-23 · [advisory](https://access.redhat.com/errata/RHSA-2026:40021)\n- **RHSA-2026:28887** · Red Hat · fixed in: Red Hat OpenShift Container Platform 4.14 · released 2026-07-01 · [advisory](https://access.redhat.com/errata/RHSA-2026:28887)\n- **RHSA-2026:28962** · Red Hat · fixed in: Red Hat OpenShift Container Platform 4.15 · released 2026-07-06 · [advisory](https://access.redhat.com/errata/RHSA-2026:28962)\n- **RHSA-2026:36620** · Red Hat · fixed in: Red Hat OpenShift Container Platform 4.16 · released 2026-07-16 · [advisory](https://access.redhat.com/errata/RHSA-2026:36620)\n- **RHSA-2026:47727** · Red Hat · fixed in: Red Hat OpenShift Container Platform 4.17 · released 2026-08-06 · [advisory](https://access.redhat.com/errata/RHSA-2026:47727)","depth":"midnight","depthScore":51,"depthScoreParts":{"impact":39.1,"likelihood":0.1,"exploitation":12,"ransomware":0},"changes":[{"seq":5247,"id":"CVE-2026-46243","ts":1788887256562,"field":"exploit_available","old":"false","new":"true"},{"seq":4130,"id":"CVE-2026-46243","ts":1788886372959,"field":"exploit_available","old":"true","new":"false"},{"seq":2903,"id":"CVE-2026-46243","ts":1788883038899,"field":"exploit_available","old":"false","new":"true"},{"seq":1932,"id":"CVE-2026-46243","ts":1788882441913,"field":"exploit_available","old":"true","new":"false"},{"seq":1021,"id":"CVE-2026-46243","ts":1788881876650,"field":"exploit_available","old":"false","new":"true"}]}