# CVE-2022-2905: CVE-2022-2905 Status: published. Published: 2022-09-09. Updated: 2026-11-02. An out-of-bounds memory read flaw was found in the Linux kernel's BPF subsystem in how a user calls the bpf_tail_call function with a key larger than the max_entries of the map. This flaw allows a local user to gain unauthorized access to data. ## Remediation - fix: The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches. (source: secalert@redhat.com) — https://bugzilla.redhat.com/show_bug.cgi?id=2121800 - fix: The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches. (source: af854a3a-2127-422b-91ae-364da2661108) — https://bugzilla.redhat.com/show_bug.cgi?id=2121800 ## Affected products and versions - n/a / kernel: Linux kernel 6.0-rc4 (affected). Source: CNA: redhat - Siemens / SIMATIC S7-1500 TM MFP - GNU/Linux subsystem: ≥ 0; < V1.1 (affected, custom). Source: ADP: siemens-SADP ## NVD configuration conditions Affected CPE matches depend on the following AND/OR and negation conditions: ```json [ { "negate": false, "nodes": [ { "cpeMatch": [ { "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionEndExcluding": "6.0", "vulnerable": true }, { "criteria": "cpe:2.3:o:linux:linux_kernel:6.0:rc1:*:*:*:*:*:*", "vulnerable": true }, { "criteria": "cpe:2.3:o:linux:linux_kernel:6.0:rc2:*:*:*:*:*:*", "vulnerable": true }, { "criteria": "cpe:2.3:o:linux:linux_kernel:6.0:rc3:*:*:*:*:*:*", "vulnerable": true } ], "negate": false, "operator": "OR" } ], "operator": "OR" }, { "negate": false, "nodes": [ { "cpeMatch": [ { "criteria": "cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:*", "vulnerable": true } ], "negate": false, "operator": "OR" } ], "operator": "OR" }, { "negate": false, "nodes": [ { "cpeMatch": [ { "criteria": "cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*", "vulnerable": true } ], "negate": false, "operator": "OR" } ], "operator": "OR" } ] ``` ## Severity and prioritization - CVSS 3.1: 5.5 (medium); CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N; source: NVD: nvd@nist.gov - CISA KEV: No listing in collected sources - EPSS: 0.36% as of 2026-11-02; percentile 30.08% - SSVC: exploitation none; automatable no; technical impact partial; source ADP: CISA-ADP - Weaknesses: CWE-125 ## Exploit evidence - exploit: https://bugzilla.redhat.com/show_bug.cgi?id=2121800 (secalert@redhat.com) - exploit: https://bugzilla.redhat.com/show_bug.cgi?id=2121800 (af854a3a-2127-422b-91ae-364da2661108) ## References - https://bugzilla.redhat.com/show_bug.cgi?id=2121800 (CNA: redhat) - https://lore.kernel.org/bpf/984b37f9fdf7ac36831d2137415a4a915744c1b6.1661462653.git.daniel%40iogearbox.net/ (CNA: redhat) - https://lists.debian.org/debian-lts-announce/2022/11/msg00001.html (CNA: redhat; mailing-list) - https://bugzilla.redhat.com/show_bug.cgi?id=2121800 (ADP: CVE; x_transferred) - https://lore.kernel.org/bpf/984b37f9fdf7ac36831d2137415a4a915744c1b6.1661462653.git.daniel%40iogearbox.net/ (ADP: CVE; x_transferred) - https://lists.debian.org/debian-lts-announce/2022/11/msg00001.html (ADP: CVE; mailing-list, x_transferred) - https://cert-portal.siemens.com/productcert/html/ssa-831302.html (ADP: siemens-SADP) - https://cert-portal.siemens.com/productcert/html/ssa-794697.html (ADP: siemens-SADP) - https://bugzilla.redhat.com/show_bug.cgi?id=2121800 (secalert@redhat.com; Exploit, Issue Tracking, Patch, Third Party Advisory) - https://lists.debian.org/debian-lts-announce/2022/11/msg00001.html (secalert@redhat.com; Mailing List, Third Party Advisory) - https://lore.kernel.org/bpf/984b37f9fdf7ac36831d2137415a4a915744c1b6.1661462653.git.daniel%40iogearbox.net/ (secalert@redhat.com) - https://bugzilla.redhat.com/show_bug.cgi?id=2121800 (af854a3a-2127-422b-91ae-364da2661108; Exploit, Issue Tracking, Patch, Third Party Advisory) - https://lists.debian.org/debian-lts-announce/2022/11/msg00001.html (af854a3a-2127-422b-91ae-364da2661108; Mailing List, Third Party Advisory) - https://lore.kernel.org/bpf/984b37f9fdf7ac36831d2137415a4a915744c1b6.1661462653.git.daniel%40iogearbox.net/ (af854a3a-2127-422b-91ae-364da2661108) - https://cert-portal.siemens.com/productcert/html/ssa-794697.html (0b142b55-0307-4c5a-b3c9-f314f3fb7c5e) - https://cert-portal.siemens.com/productcert/html/ssa-831302.html (0b142b55-0307-4c5a-b3c9-f314f3fb7c5e) ## Provenance - CNA: redhat: https://www.cve.org/CVERecord?id=CVE-2022-2905; retrieved 2026-11-02; source updated 2026-11-02 - NVD: https://nvd.nist.gov/vuln/detail/CVE-2022-2905; retrieved 2026-11-03; source updated 2026-11-02 - FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2022-2905; retrieved 2026-11-02; source updated Not reported Revision: 24dcdb200b2baf41b25329465c688b9cb09bdbedde4dd2efd449f80a99a3fbc8 Canonical: https://y2.dev/cve/CVE-2022-2905 ## Agent and API access Public CVE pages, Markdown, and JSON are free to read without an account or API key. - Public catalog: https://y2.dev/cve/index.json. 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