{"answers":{"affected":"It affects 1 product.","exploited":"It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-46243 exists.","fix":"Apply the vendor's patch.","what":"CVE-2026-46243 is a high-severity vulnerability in Linux kernel, published on 1 Jun 2026. It can only be exploited from the same machine or local network, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-46243 and fix it if it is affected.\n\nWhat it is: CVE-2026-46243 is a high-severity vulnerability in Linux kernel, published on 1 Jun 2026. It can only be exploited from the same machine or local network, with no action from the victim.\nExploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-46243 exists.\n\nAffected product: Linux kernel. No package-level version data is available, so check the vendor advisory linked from the reference page.\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2026-46243/ (Markdown: https://insights.sbomify.com/CVE-2026-46243/index.md)","id":"CVE-2026-46243","markdown":"https://insights.sbomify.com/CVE-2026-46243/index.md","name":"CVE-2026-46243","record":{"aliases":["ALSA-2026:23258","ALSA-2026:23259","AZL-89309","BELL-CVE-2026-46243","DEBIAN-CVE-2026-46243","GHSA-3mg7-pfmq-9qfv","RHSA-2026:23258","RHSA-2026:23259","RHSA-2026:23395","RLSA-2026:23258","RLSA-2026:23259","ROOT-OS-UBUNTU-2204-CVE-2026-46243","ROOT-OS-UBUNTU-2404-CVE-2026-46243","UBUNTU-CVE-2026-46243"],"analysis":{"component_type":"kernel","fix_type":"patch","impacts":["privilege_escalation"],"network_reachable":"adjacent_or_local","non_default_config":false,"product_category":"Linux kernel SMB client","requires_auth":"low_privilege","summary":"A local attacker can exploit improper validation of CIFS SPNEGO key descriptions to escalate privileges within the Linux kernel.","user_interaction":"not_required","vuln_class":"privilege_escalation"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"Linux","cpe":[{"product":"linux_kernel","vendor":"linux"}],"cvss":{"score":7.1,"severity":"high","source":"cna","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N","version":"3.1"},"cwes":[{"id":"CWE-825","name":"Expired Pointer Dereference"},{"id":"CWE-20","name":"Improper Input Validation"}],"description":"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 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.","ecosystems":["AlmaLinux:8","Red Hat:enterprise_linux:8::baseos","Red Hat:enterprise_linux:8::crb","Red Hat:enterprise_linux:8::nfv","Red Hat:enterprise_linux:8::realtime","Red Hat:enterprise_linux_nvidia:10::el10","Rocky Linux:8"],"exploits":{"exploitdb":0,"first_seen":"2026-05-30","github_poc":5,"max_poc_stars":2,"metasploit":0,"nuclei":0,"refs":[{"date":"2026-06-02T11:39:07Z","kind":"github_poc","ref":"https://github.com/MrForkBomb/CIFSwitch-Checker-CVE-2026-46243","stars":2,"title":"Script para comprobar si la vulnerabilidad de Linux CIFSwitch (CVE-2026-46243) nos afecta. Detecta configuraciones potencialmente vulnerables y mitigaciones sin ejecutar exploits."},{"date":"2026-05-30T03:59:11Z","kind":"github_poc","ref":"https://github.com/suominen/cifswitch","stars":0,"title":"Tracking CIFSwitch (CVE-2026-46243), the CIFS cifs.spnego key-origin privilege escalation"},{"date":"2026-06-01T08:03:45Z","kind":"github_poc","ref":"https://github.com/Koshmare-Blossom/CIFSwitch-go","stars":0,"title":"A Go implementation of CIFSwitch (CVE-2026-46243)"},{"date":"2026-06-03T00:15:44Z","kind":"github_poc","ref":"https://github.com/liamromanis101/cifswitch-check","stars":0,"title":"Detection script for CIFSwitch - CVE-2026-46243"},{"date":"2026-08-03T22:01:21Z","kind":"github_poc","ref":"https://github.com/0xredash/CVE-2026-46243","stars":0,"title":"CVE-2026-46243"}],"tier":"weaponised"},"has_fix":true,"headline":"smb: client: reject userspace cifs.spnego descriptions","id":"CVE-2026-46243","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":"linux:linux_kernel","products":["linux:linux_kernel"],"type":"privilege_escalation","year":"2026"},"n_packages":152,"n_references":8,"next":{"headline":"netfilter: nft_inner: Fix IPv6 inner_thoff desync","id":"CVE-2026-46244"},"packages":[{"ecosystem":"AlmaLinux:8","fixed":["4.18.0-553.129.1.el8_10"],"introduced":["0"],"last_affected":[],"package":"bpftool","purl":"pkg:rpm/almalinux/bpftool","source":"ALSA-2026:23258"},{"ecosystem":"AlmaLinux:8","fixed":["4.18.0-553.129.1.el8_10"],"introduced":["0"],"last_affected":[],"package":"kernel","purl":"pkg:rpm/almalinux/kernel","source":"ALSA-2026:23258"},{"ecosystem":"AlmaLinux:8","fixed":["4.18.0-553.129.1.el8_10"],"introduced":["0"],"last_affected":[],"package":"kernel-abi-stablelists","purl":"pkg:rpm/almalinux/kernel-abi-stablelists","source":"ALSA-2026:23258"},{"ecosystem":"AlmaLinux:8","fixed":["4.18.0-553.129.1.el8_10"],"introduced":["0"],"last_affected":[],"package":"kernel-core","purl":"pkg:rpm/almalinux/kernel-core","source":"ALSA-2026:23258"},{"ecosystem":"AlmaLinux:8","fixed":["4.18.0-553.129.1.el8_10"],"introduced":["0"],"last_affected":[],"package":"kernel-cross-headers","purl":"pkg:rpm/almalinux/kernel-cross-headers","source":"ALSA-2026:23258"},{"ecosystem":"AlmaLinux:8","fixed":["4.18.0-553.129.1.el8_10"],"introduced":["0"],"last_affected":[],"package":"kernel-debug","purl":"pkg:rpm/almalinux/kernel-debug","source":"ALSA-2026:23258"},{"ecosystem":"AlmaLinux:8","fixed":["4.18.0-553.129.1.el8_10"],"introduced":["0"],"last_affected":[],"package":"kernel-debug-core","purl":"pkg:rpm/almalinux/kernel-debug-core","source":"ALSA-2026:23258"},{"ecosystem":"AlmaLinux:8","fixed":["4.18.0-553.129.1.el8_10"],"introduced":["0"],"last_affected":[],"package":"kernel-debug-devel","purl":"pkg:rpm/almalinux/kernel-debug-devel","source":"ALSA-2026:23258"},{"ecosystem":"AlmaLinux:8","fixed":["4.18.0-553.129.1.el8_10"],"introduced":["0"],"last_affected":[],"package":"kernel-debug-modules","purl":"pkg:rpm/almalinux/kernel-debug-modules","source":"ALSA-2026:23258"},{"ecosystem":"AlmaLinux:8","fixed":["4.18.0-553.129.1.el8_10"],"introduced":["0"],"last_affected":[],"package":"kernel-debug-modules-extra","purl":"pkg:rpm/almalinux/kernel-debug-modules-extra","source":"ALSA-2026:23258"},{"ecosystem":"AlmaLinux:8","fixed":["4.18.0-553.129.1.el8_10"],"introduced":["0"],"last_affected":[],"package":"kernel-devel","purl":"pkg:rpm/almalinux/kernel-devel","source":"ALSA-2026:23258"},{"ecosystem":"AlmaLinux:8","fixed":["4.18.0-553.129.1.el8_10"],"introduced":["0"],"last_affected":[],"package":"kernel-doc","purl":"pkg:rpm/almalinux/kernel-doc","source":"ALSA-2026:23258"},{"ecosystem":"AlmaLinux:8","fixed":["4.18.0-553.129.1.el8_10"],"introduced":["0"],"last_affected":[],"package":"kernel-headers","purl":"pkg:rpm/almalinux/kernel-headers","source":"ALSA-2026:23258"},{"ecosystem":"AlmaLinux:8","fixed":["4.18.0-553.129.1.el8_10"],"introduced":["0"],"last_affected":[],"package":"kernel-modules","purl":"pkg:rpm/almalinux/kernel-modules","source":"ALSA-2026:23258"},{"ecosystem":"AlmaLinux:8","fixed":["4.18.0-553.129.1.el8_10"],"introduced":["0"],"last_affected":[],"package":"kernel-modules-extra","purl":"pkg:rpm/almalinux/kernel-modules-extra","source":"ALSA-2026:23258"},{"ecosystem":"AlmaLinux:8","fixed":["4.18.0-553.129.1.rt7.470.el8_10"],"introduced":["0"],"last_affected":[],"package":"kernel-rt","purl":"pkg:rpm/almalinux/kernel-rt","source":"ALSA-2026:23259"},{"ecosystem":"AlmaLinux:8","fixed":["4.18.0-553.129.1.rt7.470.el8_10"],"introduced":["0"],"last_affected":[],"package":"kernel-rt-core","purl":"pkg:rpm/almalinux/kernel-rt-core","source":"ALSA-2026:23259"},{"ecosystem":"AlmaLinux:8","fixed":["4.18.0-553.129.1.rt7.470.el8_10"],"introduced":["0"],"last_affected":[],"package":"kernel-rt-debug","purl":"pkg:rpm/almalinux/kernel-rt-debug","source":"ALSA-2026:23259"},{"ecosystem":"AlmaLinux:8","fixed":["4.18.0-553.129.1.rt7.470.el8_10"],"introduced":["0"],"last_affected":[],"package":"kernel-rt-debug-core","purl":"pkg:rpm/almalinux/kernel-rt-debug-core","source":"ALSA-2026:23259"},{"ecosystem":"AlmaLinux:8","fixed":["4.18.0-553.129.1.rt7.470.el8_10"],"introduced":["0"],"last_affected":[],"package":"kernel-rt-debug-devel","purl":"pkg:rpm/almalinux/kernel-rt-debug-devel","source":"ALSA-2026:23259"},{"ecosystem":"AlmaLinux:8","fixed":["4.18.0-553.129.1.rt7.470.el8_10"],"introduced":["0"],"last_affected":[],"package":"kernel-rt-debug-modules","purl":"pkg:rpm/almalinux/kernel-rt-debug-modules","source":"ALSA-2026:23259"},{"ecosystem":"AlmaLinux:8","fixed":["4.18.0-553.129.1.rt7.470.el8_10"],"introduced":["0"],"last_affected":[],"package":"kernel-rt-debug-modules-extra","purl":"pkg:rpm/almalinux/kernel-rt-debug-modules-extra","source":"ALSA-2026:23259"},{"ecosystem":"AlmaLinux:8","fixed":["4.18.0-553.129.1.rt7.470.el8_10"],"introduced":["0"],"last_affected":[],"package":"kernel-rt-devel","purl":"pkg:rpm/almalinux/kernel-rt-devel","source":"ALSA-2026:23259"},{"ecosystem":"AlmaLinux:8","fixed":["4.18.0-553.129.1.rt7.470.el8_10"],"introduced":["0"],"last_affected":[],"package":"kernel-rt-modules","purl":"pkg:rpm/almalinux/kernel-rt-modules","source":"ALSA-2026:23259"},{"ecosystem":"AlmaLinux:8","fixed":["4.18.0-553.129.1.rt7.470.el8_10"],"introduced":["0"],"last_affected":[],"package":"kernel-rt-modules-extra","purl":"pkg:rpm/almalinux/kernel-rt-modules-extra","source":"ALSA-2026:23259"},{"ecosystem":"AlmaLinux:8","fixed":["4.18.0-553.129.1.el8_10"],"introduced":["0"],"last_affected":[],"package":"kernel-tools","purl":"pkg:rpm/almalinux/kernel-tools","source":"ALSA-2026:23258"},{"ecosystem":"AlmaLinux:8","fixed":["4.18.0-553.129.1.el8_10"],"introduced":["0"],"last_affected":[],"package":"kernel-tools-libs","purl":"pkg:rpm/almalinux/kernel-tools-libs","source":"ALSA-2026:23258"},{"ecosystem":"AlmaLinux:8","fixed":["4.18.0-553.129.1.el8_10"],"introduced":["0"],"last_affected":[],"package":"kernel-tools-libs-devel","purl":"pkg:rpm/almalinux/kernel-tools-libs-devel","source":"ALSA-2026:23258"},{"ecosystem":"AlmaLinux:8","fixed":["4.18.0-553.129.1.el8_10"],"introduced":["0"],"last_affected":[],"package":"kernel-zfcpdump","purl":"pkg:rpm/almalinux/kernel-zfcpdump","source":"ALSA-2026:23258"},{"ecosystem":"AlmaLinux:8","fixed":["4.18.0-553.129.1.el8_10"],"introduced":["0"],"last_affected":[],"package":"kernel-zfcpdump-core","purl":"pkg:rpm/almalinux/kernel-zfcpdump-core","source":"ALSA-2026:23258"},{"ecosystem":"AlmaLinux:8","fixed":["4.18.0-553.129.1.el8_10"],"introduced":["0"],"last_affected":[],"package":"kernel-zfcpdump-devel","purl":"pkg:rpm/almalinux/kernel-zfcpdump-devel","source":"ALSA-2026:23258"},{"ecosystem":"AlmaLinux:8","fixed":["4.18.0-553.129.1.el8_10"],"introduced":["0"],"last_affected":[],"package":"kernel-zfcpdump-modules","purl":"pkg:rpm/almalinux/kernel-zfcpdump-modules","source":"ALSA-2026:23258"},{"ecosystem":"AlmaLinux:8","fixed":["4.18.0-553.129.1.el8_10"],"introduced":["0"],"last_affected":[],"package":"kernel-zfcpdump-modules-extra","purl":"pkg:rpm/almalinux/kernel-zfcpdump-modules-extra","source":"ALSA-2026:23258"},{"ecosystem":"AlmaLinux:8","fixed":["4.18.0-553.129.1.el8_10"],"introduced":["0"],"last_affected":[],"package":"perf","purl":"pkg:rpm/almalinux/perf","source":"ALSA-2026:23258"},{"ecosystem":"AlmaLinux:8","fixed":["4.18.0-553.129.1.el8_10"],"introduced":["0"],"last_affected":[],"package":"python3-perf","purl":"pkg:rpm/almalinux/python3-perf","source":"ALSA-2026:23258"},{"ecosystem":"Red Hat:enterprise_linux:8::baseos","fixed":["0:4.18.0-553.129.1.el8_10"],"introduced":["0"],"last_affected":[],"package":"bpftool","purl":"pkg:rpm/redhat/bpftool","source":"RHSA-2026:23258"},{"ecosystem":"Red Hat:enterprise_linux:8::baseos","fixed":["0:4.18.0-553.129.1.el8_10"],"introduced":["0"],"last_affected":[],"package":"bpftool-debuginfo","purl":"pkg:rpm/redhat/bpftool-debuginfo","source":"RHSA-2026:23258"},{"ecosystem":"Red Hat:enterprise_linux:8::baseos","fixed":["0:4.18.0-553.129.1.el8_10"],"introduced":["0"],"last_affected":[],"package":"kernel","purl":"pkg:rpm/redhat/kernel","source":"RHSA-2026:23258"},{"ecosystem":"Red Hat:enterprise_linux:8::baseos","fixed":["0:4.18.0-553.129.1.el8_10"],"introduced":["0"],"last_affected":[],"package":"kernel-abi-stablelists","purl":"pkg:rpm/redhat/kernel-abi-stablelists","source":"RHSA-2026:23258"},{"ecosystem":"Red Hat:enterprise_linux:8::baseos","fixed":["0:4.18.0-553.129.1.el8_10"],"introduced":["0"],"last_affected":[],"package":"kernel-core","purl":"pkg:rpm/redhat/kernel-core","source":"RHSA-2026:23258"}],"prev":{"headline":"eventpoll: fix ep_remove struct eventpoll / struct file UAF","id":"CVE-2026-46242"},"products":["Linux"],"published":"2026-06-01","related":[{"cvss_score":8.8,"headline":"Linux Kernel Out-of-Bounds Write","id":"CVE-2026-53266","kev_date_added":"2026-09-18","published":"2026-06-25"},{"cvss_score":8.8,"headline":"Linux Kernel Improper Input Validation","id":"CVE-2013-6282","kev_date_added":"2022-09-15","published":"2013-11-19"},{"cvss_score":8.4,"headline":"Linux Kernel Heap-Based Buffer Overflow","id":"CVE-2022-0185","kev_date_added":"2024-08-21","published":"2022-02-11"},{"cvss_score":8.4,"headline":"Linux Kernel Privilege Escalation","id":"CVE-2013-2094","kev_date_added":"2022-09-15","published":"2013-05-14"},{"cvss_score":7.8,"headline":"Linux Kernel Unspecified","id":"CVE-2026-53362","kev_date_added":"2026-08-27","published":"2026-07-04"},{"cvss_score":7.8,"headline":"Linux Kernel Missing Initialization of a Variable","id":"CVE-2026-46300","kev_date_added":"2026-10-28","published":"2026-05-23"},{"cvss_score":7.8,"headline":"Linux Kernel Race Condition","id":"CVE-2025-39964","kev_date_added":"2026-09-18","published":"2025-10-13"}],"sources":[{"class":"attribution","licence":"MIT","name":"AlmaLinux","prefix":"ALSA"},{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CC BY 4.0","name":"Red Hat","prefix":"RHSA"},{"class":"attribution","licence":"US public information, NVD API terms","name":"NVD"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"},{"class":"open","licence":"CC0","name":"PoC-in-GitHub"}],"ssvc":{"automatable":"no","exploitation":"poc","technical_impact":"total"},"state":"PUBLISHED","updated":"2026-10-15","vendors":["Linux"]},"summary":"A local attacker can exploit improper validation of CIFS SPNEGO key descriptions to escalate privileges within the Linux kernel.","url":"https://insights.sbomify.com/CVE-2026-46243/"}