{ "id": "CVE-2026-46300", "url": "https://spydr.io/cve/CVE-2026-46300", "published": "2026-05-23T12:17:02.660Z", "modified": "2026-10-28T20:17:26.883Z", "score": 7.8, "severity": "high", "cvss_version": "3.1", "vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "score_source": "NVD", "epss": null, "epss_percentile": null, "exploited": true, "kev": { "added": "2026-10-28", "due": "2026-10-31", "action": "Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.", "ransomware": "Unknown", "name": "Linux Kernel Missing Initialization of a Variable Vulnerability", "notes": "This vulnerability affects an open-source component, third-party library, protocol, or proprietary implementation that could be used by different products. For more information, please see: ; https://git.kernel.org/stable/c/3599e6b3cc1ada96883d496a50a210d3afbb6987 ; https://git.kernel.org/stable/c/2f2b16022a2e10ca7bccfb98db5ed2ec0f72641c ; https://git.kernel.org/stable/c/9d3e5fd19fe1063bf607219e8562fbd567b8e8d5 ; https://git.kernel.org/stable/c/78bf6b6bb19541d19fbda6242e7cfe2c682763c0 ; https://git.kernel.org/stable/c/760e1addc27ba1a7beb4a0a7e8b3e9ec49e7a34e ; https://git.kernel.org/stable/c/3bd9e113d50034db99d7ef69fd8e5242d15e414a ; https://git.kernel.org/stable/c/3884358a9286b17f389a72b1426fc4547c23c111 ; https://git.kernel.org/stable/c/f84eca5817390257cef78013d0112481c503b4a3 ; BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk ; Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk ; https://nvd.nist.gov/vuln/detail/CVE-2026-46300" }, "ssvc_exploitation": "active", "vendors": [ "Linux", "Red Hat", "Siemens" ], "products": [ "Linux", "Red Hat NVIDIA for RHEL 10", "Red Hat Enterprise Linux 10", "Red Hat Enterprise Linux 10.0 Extended Update Support", "Red Hat Enterprise Linux 8", "Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support", "Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On", "Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support", "Red Hat Enterprise Linux 8.6 Telecommunications Update Service", "Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions", "Red Hat Enterprise Linux 8.8 Telecommunications Update Service", "Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions", "Red Hat Enterprise Linux 9", "Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions", "Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions", "Red Hat Enterprise Linux 9.4 Extended Update Support", "Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions", "Red Hat Enterprise Linux 9.6 Extended Update Support", "Red Hat OpenShift Container Platform 4.12", "Red Hat OpenShift Container Platform 4.13" ], "cwes": [ "CWE-787", "CWE-456", "CWE-123" ], "description": "In the Linux kernel, the following vulnerability has been resolved: net: skbuff: preserve shared-frag marker during coalescing skb_try_coalesce() can attach paged frags from @from to @to. If @from has SKBFL_SHARED_FRAG set, the resulting @to skb can contain the same externally-owned or page-cache-backed frags, but the shared-frag marker is currently lost. That breaks the invariant relied on by later in-place writers. In particular, ESP input checks skb_has_shared_frag() before deciding whether an uncloned nonlinear skb can skip skb_cow_data(). If TCP receive coalescing has moved shared frags into an unmarked skb, ESP can see skb_has_shared_frag() as false and decrypt in place over page-cache backed frags. Propagate SKBFL_SHARED_FRAG when skb_try_coalesce() transfers paged frags. The tailroom copy path does not need the marker because it copies bytes into @to's linear data rather than transferring frag descriptors.", "status": "Undergoing Analysis", "score_type": "Primary", "scores": { "cvss_v40": null, "cvss_v31": 7.8, "cvss_v30": null }, "references": [ { "url": "https://git.kernel.org/stable/c/2f2b16022a2e10ca7bccfb98db5ed2ec0f72641c", "tags": [ "Patch" ] }, { "url": "https://git.kernel.org/stable/c/3599e6b3cc1ada96883d496a50a210d3afbb6987", "tags": [ "Patch" ] }, { "url": "https://git.kernel.org/stable/c/3884358a9286b17f389a72b1426fc4547c23c111", "tags": [ "Patch" ] }, { "url": "https://git.kernel.org/stable/c/3bd9e113d50034db99d7ef69fd8e5242d15e414a", "tags": [ "Patch" ] }, { "url": "https://git.kernel.org/stable/c/760e1addc27ba1a7beb4a0a7e8b3e9ec49e7a34e", "tags": [ "Patch" ] }, { "url": "https://git.kernel.org/stable/c/78bf6b6bb19541d19fbda6242e7cfe2c682763c0", "tags": [ "Patch" ] }, { "url": "https://git.kernel.org/stable/c/9d3e5fd19fe1063bf607219e8562fbd567b8e8d5", "tags": [ "Patch" ] }, { "url": "https://git.kernel.org/stable/c/f84eca5817390257cef78013d0112481c503b4a3", "tags": [ "Patch" ] }, { "url": "http://www.openwall.com/lists/oss-security/2026/05/13/5", "tags": [ "Mailing List" ] }, { "url": "http://www.openwall.com/lists/oss-security/2026/05/21/11", "tags": [ "Mailing List" ] }, { "url": "http://www.openwall.com/lists/oss-security/2026/05/21/12", "tags": [ "Mailing List" ] }, { "url": "http://www.openwall.com/lists/oss-security/2026/05/21/13", "tags": [ "Mailing List" ] }, { "url": "https://access.redhat.com/errata/RHBA-2026:20032", "tags": [] }, { "url": "https://access.redhat.com/errata/RHSA-2026:19521", "tags": [] }, { "url": "https://access.redhat.com/errata/RHSA-2026:19540", "tags": [] }, { "url": "https://access.redhat.com/errata/RHSA-2026:19568", "tags": [] }, { "url": "https://access.redhat.com/errata/RHSA-2026:19569", "tags": [] }, { "url": "https://access.redhat.com/errata/RHSA-2026:19664", "tags": [] }, { "url": "https://access.redhat.com/errata/RHSA-2026:19666", "tags": [] }, { "url": "https://access.redhat.com/errata/RHSA-2026:19705", "tags": [] }, { "url": "https://access.redhat.com/errata/RHSA-2026:19711", "tags": [] }, { "url": "https://access.redhat.com/errata/RHSA-2026:19875", "tags": [] }, { "url": "https://access.redhat.com/errata/RHSA-2026:20051", "tags": [] }, { "url": "https://access.redhat.com/errata/RHSA-2026:20054", "tags": [] }, { "url": "https://access.redhat.com/errata/RHSA-2026:20087", "tags": [] } ], "nvd_url": "https://nvd.nist.gov/vuln/detail/CVE-2026-46300", "covered_in": [], "attribution": [ { "source": "NVD", "url": "https://nvd.nist.gov", "notice": "This product uses data from the NVD API but is not endorsed or certified by the NVD." }, { "source": "CISA KEV", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog", "notice": "Known exploited vulnerabilities from the CISA KEV catalog." }, { "source": "FIRST EPSS", "url": "https://www.first.org/epss", "notice": "Exploit prediction scores from FIRST EPSS." } ] }