{ "document": { "category": "csaf_vex", "csaf_version": "2.0", "distribution": { "text": "TuxCare License Agreement", "tlp": { "label": "WHITE", "url": "https://www.first.org/tlp/" } }, "lang": "en", "notes": [ { "category": "legal_disclaimer", "text": "This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Cloud Linux Inc. and provide a link to the original.", "title": "Terms of Use" } ], "publisher": { "category": "vendor", "contact_details": "https://tuxcare.com/contact/", "name": "TuxCare", "namespace": "https://tuxcare.com/" }, "references": [ { "category": "self", "summary": "Canonical URL", "url": "https://security.tuxcare.com/csaf/v2/els_os/debian10els/vex/2026/cve-2026-63920-els_os-debian10els.json" } ], "tracking": { "current_release_date": "2026-09-16T16:58:54Z", "generator": { "date": "2026-09-16T16:58:54Z", "engine": { "name": "pyCSAF" } }, "id": "CVE-2026-63920-ELS_OS-DEBIAN10ELS", "initial_release_date": "2026-07-19T14:55:22Z", "revision_history": [ { "date": "2026-07-19T14:55:22Z", "number": "1", "summary": "Initial version" }, { "date": "2026-09-16T13:21:20Z", "number": "2", "summary": "Official Publication" }, { "date": "2026-09-16T16:58:54Z", "number": "3", "summary": "Update document" } ], "status": "final", "version": "3" }, "title": "Security update on CVE-2026-63920" }, "product_tree": { "branches": [ { "branches": [ { "branches": [ { "category": "product_name", "name": "Debian 10", "product": { "name": "Debian 10", "product_id": "Debian-10", "product_identification_helper": { "cpe": "cpe:2.3:o:debian:debian_linux:10:*:*:*:*:*:*:*" } } } ], "category": "product_family", "name": "Debian" }, { "branches": [ { "category": "product_version", "name": "linux-headers-4.19.0-28-all-amd64-0:4.19.325-1.amd64", "product": { "name": "linux-headers-4.19.0-28-all-amd64-0:4.19.325-1.amd64", "product_id": "linux-headers-4.19.0-28-all-amd64-0:4.19.325-1.amd64", "product_identification_helper": { "purl": "pkg:deb/debian/linux-headers-4.19.0-28-all-amd64@4.19.325-1?arch=amd64" } } }, { "category": "product_version", "name": "linux-libc-dev-0:4.19.325-1.amd64", "product": { "name": "linux-libc-dev-0:4.19.325-1.amd64", "product_id": "linux-libc-dev-0:4.19.325-1.amd64", 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as a component of Debian 10", "product_id": "Debian-10:linux-cpupower-0:4.19.325-1.amd64" }, "product_reference": "linux-cpupower-0:4.19.325-1.amd64", "relates_to_product_reference": "Debian-10" }, { "category": "default_component_of", "full_product_name": { "name": "linux-cpupower-0:4.19.325-2.amd64 as a component of Debian 10", "product_id": "Debian-10:linux-cpupower-0:4.19.325-2.amd64" }, "product_reference": "linux-cpupower-0:4.19.325-2.amd64", "relates_to_product_reference": "Debian-10" }, { "category": "default_component_of", "full_product_name": { "name": "linux-headers-4.19.0-28-amd64-0:4.19.325-1.amd64 as a component of Debian 10", "product_id": "Debian-10:linux-headers-4.19.0-28-amd64-0:4.19.325-1.amd64" }, "product_reference": "linux-headers-4.19.0-28-amd64-0:4.19.325-1.amd64", "relates_to_product_reference": "Debian-10" }, { "category": "default_component_of", "full_product_name": { "name": "linux-image-4.19.0-28-amd64-unsigned-0:4.19.325-1.amd64 as a component of Debian 10", "product_id": "Debian-10:linux-image-4.19.0-28-amd64-unsigned-0:4.19.325-1.amd64" }, "product_reference": "linux-image-4.19.0-28-amd64-unsigned-0:4.19.325-1.amd64", "relates_to_product_reference": "Debian-10" } ] }, "vulnerabilities": [ { "cve": "CVE-2026-63920", "notes": [ { "category": "description", "text": "In the Linux kernel, the following vulnerability has been resolved:\n\nipv6: validate extension header length before copying to cmsg\n\nip6_datagram_recv_specific_ctl() builds IPV6_{HOPOPTS,DSTOPTS,RTHDR}\ncmsgs (and their IPV6_2292* legacy counterparts) by trusting the\non-wire hdrlen byte (ptr[1]) when computing the put_cmsg() length.\nThe length was validated only at parse time (ipv6_parse_hopopts(),\netc.). An nftables payload-write expression can rewrite hdrlen after\nparsing and before the skb reaches recvmsg; the write itself is\nin-bounds but put_cmsg() then reads up to ((hdrlen+1) << 3) = 2040\nbytes from an 8-byte header. nftables is reachable from an\nunprivileged user namespace, so this is an unprivileged\nslab-out-of-bounds read:\n\n BUG: KASAN: slab-out-of-bounds in put_cmsg+0x3ac/0x540\n put_cmsg+0x3ac/0x540\n udpv6_recvmsg+0xca0/0x1250\n sock_recvmsg+0xdf/0x190\n ____sys_recvmsg+0x1b1/0x620\n\nAdd ipv6_get_exthdr_len() which validates that at least two bytes\nare accessible before reading the hdrlen field, then checks the\ncomputed length against skb_tail_pointer(skb), returning 0 on\nfailure. Extension headers are kept in the linear skb area by\npskb_may_pull() during input, so skb_tail_pointer() is the correct\nbound.\n\nUse ipv6_get_exthdr_len() at all non-AH call sites: the five\nstandalone cmsg blocks (HbH, 2292HbH, 2292DSTOPTS x2, 2292RTHDR)\nand the three standard cases in the extension-header walk loop\n(DSTOPTS, ROUTING, default). AH retains an inline bounds check\nbecause its length formula differs ((ptr[1]+2)<<2).\n\nThe walk loop also gets a pre-read bounds check at the top to\nvalidate ptr before any case accesses ptr[0] or ptr[1].\n\nWhen the walk loop detects a corrupted header, return from the\nfunction instead of continuing to process later socket options.", "title": "Vulnerability description" } ], "product_status": { "known_affected": [ "Debian-10:hyperv-daemons-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:hyperv-daemons-0:4.19.325-1.amd64", "Debian-10:hyperv-daemons-0:4.19.325-2+tuxcare.els1.amd64", "Debian-10:hyperv-daemons-0:4.19.325-2.amd64", "Debian-10:libbpf-dev-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:libbpf-dev-0:4.19.325-1.amd64", "Debian-10:libbpf-dev-0:4.19.325-2+tuxcare.els1.amd64", "Debian-10:libbpf-dev-0:4.19.325-2.amd64", "Debian-10:libbpf4.19-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:libbpf4.19-0:4.19.325-1.amd64", "Debian-10:libbpf4.19-0:4.19.325-2+tuxcare.els1.amd64", 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"Debian-10:linux-source-4.19-0:4.19.325-2.all", "Debian-10:linux-support-4.19.0-28-0:4.19.325-1+tuxcare.els1.all", "Debian-10:linux-support-4.19.0-28-0:4.19.325-1.all", "Debian-10:linux-support-4.19.0-29-0:4.19.325-2+tuxcare.els1.all", "Debian-10:linux-support-4.19.0-29-0:4.19.325-2.all" ] }, "references": [ { "category": "self", "summary": "Canonical URL", "url": "https://cve.tuxcare.com/els/cve/CVE-2026-63920" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/08464413e628803bd10cb1df68d0138665f2f885", "url": "https://git.kernel.org/stable/c/08464413e628803bd10cb1df68d0138665f2f885" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/0d330eff318c0f44d4fb0ad2c2aef38f87f24c90", "url": "https://git.kernel.org/stable/c/0d330eff318c0f44d4fb0ad2c2aef38f87f24c90" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/81394827dfb72772c50d0ae3bdfa094428a5d76d", "url": "https://git.kernel.org/stable/c/81394827dfb72772c50d0ae3bdfa094428a5d76d" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/931b4a1f13408c2507719890f78f7227c34a0282", "url": "https://git.kernel.org/stable/c/931b4a1f13408c2507719890f78f7227c34a0282" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/a29768d56eb3798c052ad3281b05596e695a17af", "url": "https://git.kernel.org/stable/c/a29768d56eb3798c052ad3281b05596e695a17af" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/a35daeabb433686234b010ebf7b53778dbd6c9b8", "url": "https://git.kernel.org/stable/c/a35daeabb433686234b010ebf7b53778dbd6c9b8" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/dd433671fef381fdaf7b530c631e6b782d66e224", "url": "https://git.kernel.org/stable/c/dd433671fef381fdaf7b530c631e6b782d66e224" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/eb18a1b1644e4cad978df2131e2bb9a2e6886992", "url": "https://git.kernel.org/stable/c/eb18a1b1644e4cad978df2131e2bb9a2e6886992" } ], "release_date": "2026-07-19T14:55:22Z", "remediations": [ { "category": "no_fix_planned", "date": "2026-09-16T14:42:09.595760Z", "details": "This is a local-only information disclosure that requires a very specific chain: the attacker must create a user+network namespace to gain CAP_NET_ADMIN, install an nftables payload‑set rule, explicitly enable IPv6 extension‑header ancillary options (e.g., IPV6_RECVHOPOPTS/DSTOPTS/RTHDR) on a UDPv6/raw socket, and then receive crafted IPv6 traffic to their own socket. The bug is an out‑of‑bounds read only—no write or privilege‑escalation primitive—leaking at most roughly 2 KB of adjacent kernel‑slab data to the same local process and it does not cross VM/host boundaries. Given these narrow prerequisites and the impact being confined to the local kernel instance, it can be safely deprioritized for centrally managed enterprise servers and cloud VMs.", "product_ids": [ "Debian-10:hyperv-daemons-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:hyperv-daemons-0:4.19.325-1.amd64", "Debian-10:hyperv-daemons-0:4.19.325-2+tuxcare.els1.amd64", "Debian-10:hyperv-daemons-0:4.19.325-2.amd64", "Debian-10:libbpf-dev-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:libbpf-dev-0:4.19.325-1.amd64", "Debian-10:libbpf-dev-0:4.19.325-2+tuxcare.els1.amd64", "Debian-10:libbpf-dev-0:4.19.325-2.amd64", "Debian-10:libbpf4.19-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:libbpf4.19-0:4.19.325-1.amd64", "Debian-10:libbpf4.19-0:4.19.325-2+tuxcare.els1.amd64", "Debian-10:libbpf4.19-0:4.19.325-2.amd64", "Debian-10:libcpupower-dev-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:libcpupower-dev-0:4.19.325-1.amd64", "Debian-10:libcpupower-dev-0:4.19.325-2+tuxcare.els1.amd64", "Debian-10:libcpupower-dev-0:4.19.325-2.amd64", "Debian-10:libcpupower1-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:libcpupower1-0:4.19.325-1.amd64", "Debian-10:libcpupower1-0:4.19.325-2+tuxcare.els1.amd64", "Debian-10:libcpupower1-0:4.19.325-2.amd64", "Debian-10:linux-compiler-gcc-8-x86-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-compiler-gcc-8-x86-0:4.19.325-1.amd64", "Debian-10:linux-compiler-gcc-8-x86-0:4.19.325-2+tuxcare.els1.amd64", "Debian-10:linux-compiler-gcc-8-x86-0:4.19.325-2.amd64", "Debian-10:linux-config-4.19-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-config-4.19-0:4.19.325-1.amd64", "Debian-10:linux-config-4.19-0:4.19.325-2+tuxcare.els1.amd64", "Debian-10:linux-config-4.19-0:4.19.325-2.amd64", "Debian-10:linux-cpupower-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-cpupower-0:4.19.325-1.amd64", "Debian-10:linux-cpupower-0:4.19.325-2+tuxcare.els1.amd64", "Debian-10:linux-cpupower-0:4.19.325-2.amd64", "Debian-10:linux-doc-4.19-0:4.19.325-1+tuxcare.els1.all", "Debian-10:linux-doc-4.19-0:4.19.325-1.all", "Debian-10:linux-doc-4.19-0:4.19.325-2+tuxcare.els1.all", "Debian-10:linux-doc-4.19-0:4.19.325-2.all", "Debian-10:linux-headers-4.19.0-28-all-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-headers-4.19.0-28-all-0:4.19.325-1.amd64", "Debian-10:linux-headers-4.19.0-28-all-amd64-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-headers-4.19.0-28-all-amd64-0:4.19.325-1.amd64", "Debian-10:linux-headers-4.19.0-28-amd64-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-headers-4.19.0-28-amd64-0:4.19.325-1.amd64", "Debian-10:linux-headers-4.19.0-28-common-0:4.19.325-1+tuxcare.els1.all", "Debian-10:linux-headers-4.19.0-28-common-0:4.19.325-1.all", "Debian-10:linux-headers-4.19.0-29-all-0:4.19.325-2+tuxcare.els1.amd64", "Debian-10:linux-headers-4.19.0-29-all-0:4.19.325-2.amd64", "Debian-10:linux-headers-4.19.0-29-all-amd64-0:4.19.325-2+tuxcare.els1.amd64", "Debian-10:linux-headers-4.19.0-29-all-amd64-0:4.19.325-2.amd64", "Debian-10:linux-headers-4.19.0-29-amd64-0:4.19.325-2+tuxcare.els1.amd64", "Debian-10:linux-headers-4.19.0-29-amd64-0:4.19.325-2.amd64", "Debian-10:linux-headers-4.19.0-29-common-0:4.19.325-2+tuxcare.els1.all", "Debian-10:linux-headers-4.19.0-29-common-0:4.19.325-2.all", "Debian-10:linux-image-4.19.0-28-amd64-unsigned-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-image-4.19.0-28-amd64-unsigned-0:4.19.325-1.amd64", "Debian-10:linux-image-4.19.0-29-amd64-unsigned-0:4.19.325-2+tuxcare.els1.amd64", "Debian-10:linux-image-4.19.0-29-amd64-unsigned-0:4.19.325-2.amd64", "Debian-10:linux-image-amd64-signed-template-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-image-amd64-signed-template-0:4.19.325-1.amd64", "Debian-10:linux-image-amd64-signed-template-0:4.19.325-2+tuxcare.els1.amd64", "Debian-10:linux-image-amd64-signed-template-0:4.19.325-2.amd64", "Debian-10:linux-kbuild-4.19-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-kbuild-4.19-0:4.19.325-1.amd64", "Debian-10:linux-kbuild-4.19-0:4.19.325-2+tuxcare.els1.amd64", "Debian-10:linux-kbuild-4.19-0:4.19.325-2.amd64", "Debian-10:linux-libc-dev-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-libc-dev-0:4.19.325-1.amd64", "Debian-10:linux-libc-dev-0:4.19.325-2+tuxcare.els1.amd64", "Debian-10:linux-libc-dev-0:4.19.325-2.amd64", "Debian-10:linux-perf-4.19-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-perf-4.19-0:4.19.325-1.amd64", "Debian-10:linux-perf-4.19-0:4.19.325-2+tuxcare.els1.amd64", "Debian-10:linux-perf-4.19-0:4.19.325-2.amd64", "Debian-10:linux-source-4.19-0:4.19.325-1+tuxcare.els1.all", "Debian-10:linux-source-4.19-0:4.19.325-1.all", "Debian-10:linux-source-4.19-0:4.19.325-2+tuxcare.els1.all", "Debian-10:linux-source-4.19-0:4.19.325-2.all", "Debian-10:linux-support-4.19.0-28-0:4.19.325-1+tuxcare.els1.all", "Debian-10:linux-support-4.19.0-28-0:4.19.325-1.all", "Debian-10:linux-support-4.19.0-29-0:4.19.325-2+tuxcare.els1.all", "Debian-10:linux-support-4.19.0-29-0:4.19.325-2.all" ] } ] } ] }