{ "document": { "aggregate_severity": { "text": "High" }, "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-2026-43503-els_os-debian10els.json" } ], "tracking": { "current_release_date": "2026-08-25T12:36:00Z", "generator": { "date": "2026-08-25T12:36:00Z", "engine": { "name": "pyCSAF" } }, "id": "CVE-2026-43503-ELS_OS-DEBIAN10ELS", "initial_release_date": "2026-05-23T12:17:00Z", "revision_history": [ { "date": "2026-05-23T12:17:00Z", "number": "1", "summary": "Initial version" }, { "date": "2026-08-25T12:36:00Z", "number": "2", "summary": "Official Publication" } ], "status": "final", "version": "2" }, "title": "Security update on CVE-2026-43503" }, "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" } ], "category": "vendor", "name": "Software in the Public Interest, Inc." }, { "branches": [ { "branches": [ { "category": "product_version", "name": "linux-headers-4.19.0-28-all-amd64-0:4.19.325-1+tuxcare.els1.amd64", "product": { "name": "linux-headers-4.19.0-28-all-amd64-0:4.19.325-1+tuxcare.els1.amd64", "product_id": "linux-headers-4.19.0-28-all-amd64-0:4.19.325-1+tuxcare.els1.amd64", "product_identification_helper": { "purl": "pkg:deb/tuxcare/linux-headers-4.19.0-28-all-amd64@4.19.325-1%2Btuxcare.els1?arch=amd64" } } }, { "category": "product_version", "name": "linux-libc-dev-0:4.19.325-1+tuxcare.els1.amd64", "product": { "name": 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"category": "default_component_of", "full_product_name": { "name": "linux-image-4.19.0-28-amd64-unsigned-0:4.19.325-1+tuxcare.els1.amd64 as a component of Debian 10", "product_id": "Debian-10:linux-image-4.19.0-28-amd64-unsigned-0:4.19.325-1+tuxcare.els1.amd64" }, "product_reference": "linux-image-4.19.0-28-amd64-unsigned-0:4.19.325-1+tuxcare.els1.amd64", "relates_to_product_reference": "Debian-10" } ] }, "vulnerabilities": [ { "cve": "CVE-2026-43503", "notes": [ { "category": "description", "text": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: skbuff: propagate shared-frag marker through frag-transfer helpers\n\nTwo frag-transfer helpers (__pskb_copy_fclone() and skb_shift()) fail\nto propagate the SKBFL_SHARED_FRAG bit in skb_shinfo()->flags when\nmoving frags from source to destination. __pskb_copy_fclone() defers\nthe rest of the shinfo metadata to skb_copy_header() after copying\nfrag descriptors, but that helper only carries over gso_{size,segs,\ntype} and never touches skb_shinfo()->flags; skb_shift() moves frag\ndescriptors directly and leaves flags untouched. As a result, the\ndestination skb keeps a reference to the same externally-owned or\npage-cache-backed pages while reporting skb_has_shared_frag() as\nfalse.\n\nThe mismatch is harmful in any in-place writer that uses\nskb_has_shared_frag() to decide whether shared pages must be detoured\nthrough skb_cow_data(). ESP input is one such writer (esp4.c,\nesp6.c), and a single nft 'dup to ' rule -- or any other\nnf_dup_ipv4() / xt_TEE caller -- is enough to land a pskb_copy()'d\nskb in esp_input() with the marker stripped, letting an unprivileged\nuser write into the page cache of a root-owned read-only file via\nauthencesn-ESN stray writes.\n\nSet SKBFL_SHARED_FRAG on the destination whenever frag descriptors\nwere actually moved from the source. skb_copy() and skb_copy_expand()\nshare skb_copy_header() too but linearize all paged data into freshly\nallocated head storage and emerge with nr_frags == 0, so\nskb_has_shared_frag() returns false on its own; they need no change.\n\nThe same omission exists in skb_gro_receive() and skb_gro_receive_list().\nThe former moves the incoming skb's frag descriptors into the\naccumulator's last sub-skb via two paths (a direct frag-move loop and\nthe head_frag + memcpy path); the latter chains the incoming skb whole\nonto p's frag_list. Downstream skb_segment() reads only\nskb_shinfo(p)->flags, and skb_segment_list() reuses each sub-skb's\nshinfo as the nskb -- both p and lp must carry the marker.\n\nThe same omission also exists in tcp_clone_payload(), which builds an\nMTU probe skb by moving frag descriptors from skbs on sk_write_queue\ninto a freshly allocated nskb. The helper falls into the same family\nand warrants the same fix for consistency; no TCP TX-side in-place\nwriter is currently known to reach a user page through this gap, but\na future consumer depending on the marker would regress silently.\n\nThe same omission exists in skb_segment(): the per-iteration flag\nmerge takes only head_skb's flag, and the inner switch that rebinds\nfrag_skb to list_skb on head_skb-frags exhaustion does not fold the\nnew frag_skb's flag into nskb. Fold frag_skb's flag at both sites\nso segments drawing frags from frag_list members carry the marker.", "title": "Vulnerability description" }, { "category": "general", "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.", "title": "CVSS score applicability" } ], "product_status": { "under_investigation": [ "Debian-10:hyperv-daemons-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:libbpf-dev-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:libbpf4.19-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:libcpupower-dev-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:libcpupower1-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-compiler-gcc-8-x86-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-config-4.19-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-cpupower-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-doc-4.19-0:4.19.325-1+tuxcare.els1.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-amd64-0:4.19.325-1+tuxcare.els1.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-common-0:4.19.325-1+tuxcare.els1.all", "Debian-10:linux-image-4.19.0-28-amd64-unsigned-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-image-amd64-signed-template-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-kbuild-4.19-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-libc-dev-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-perf-4.19-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-source-4.19-0:4.19.325-1+tuxcare.els1.all", "Debian-10:linux-support-4.19.0-28-0:4.19.325-1+tuxcare.els1.all" ] }, "references": [ { "category": "self", "summary": "Canonical URL", "url": "https://cve.tuxcare.com/els/cve/CVE-2026-43503" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/12401fcfb01f53ccc63ab0a3246570fe8f3105ee", "url": "https://git.kernel.org/stable/c/12401fcfb01f53ccc63ab0a3246570fe8f3105ee" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/179f1852bdedc300e373e807cc102cd81feff196", "url": "https://git.kernel.org/stable/c/179f1852bdedc300e373e807cc102cd81feff196" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/48f6a5356a33dd78e7144ae1faef95ffc990aae0", "url": "https://git.kernel.org/stable/c/48f6a5356a33dd78e7144ae1faef95ffc990aae0" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/989214c66884d70716d83dc1d0bf5e16287bf349", "url": "https://git.kernel.org/stable/c/989214c66884d70716d83dc1d0bf5e16287bf349" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/9bc9d6d6967a2239aa57af2aa53554eddd640d20", "url": "https://git.kernel.org/stable/c/9bc9d6d6967a2239aa57af2aa53554eddd640d20" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/fbeab9555564a1b98e8582cd106dfe46c4606991", "url": "https://git.kernel.org/stable/c/fbeab9555564a1b98e8582cd106dfe46c4606991" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/fc6eb39c55e97df2f94ad974b8a5bbcd019da2c8", "url": "https://git.kernel.org/stable/c/fc6eb39c55e97df2f94ad974b8a5bbcd019da2c8" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/ff375cc75f9167168db38e0464a482d5fbc8d81d", "url": "https://git.kernel.org/stable/c/ff375cc75f9167168db38e0464a482d5fbc8d81d" }, { "category": "external", "summary": "https://access.redhat.com/errata/RHSA-2026:19521", "url": "https://access.redhat.com/errata/RHSA-2026:19521" }, { "category": "external", "summary": "https://access.redhat.com/errata/RHSA-2026:19540", "url": "https://access.redhat.com/errata/RHSA-2026:19540" }, { "category": "external", "summary": "https://access.redhat.com/errata/RHSA-2026:19568", "url": "https://access.redhat.com/errata/RHSA-2026:19568" }, { "category": "external", "summary": "https://access.redhat.com/errata/RHSA-2026:19569", "url": "https://access.redhat.com/errata/RHSA-2026:19569" }, { "category": "external", "summary": "https://access.redhat.com/errata/RHSA-2026:19664", "url": "https://access.redhat.com/errata/RHSA-2026:19664" }, { "category": "external", "summary": "https://access.redhat.com/errata/RHSA-2026:19666", "url": "https://access.redhat.com/errata/RHSA-2026:19666" }, { "category": "external", "summary": "https://access.redhat.com/errata/RHSA-2026:19705", "url": "https://access.redhat.com/errata/RHSA-2026:19705" }, { "category": "external", "summary": "https://access.redhat.com/errata/RHSA-2026:19711", "url": "https://access.redhat.com/errata/RHSA-2026:19711" }, { "category": "external", "summary": "https://access.redhat.com/errata/RHSA-2026:19875", "url": "https://access.redhat.com/errata/RHSA-2026:19875" }, { "category": "external", "summary": "https://access.redhat.com/errata/RHSA-2026:20051", "url": "https://access.redhat.com/errata/RHSA-2026:20051" }, { "category": "external", "summary": "https://access.redhat.com/errata/RHSA-2026:20054", "url": "https://access.redhat.com/errata/RHSA-2026:20054" }, { "category": "external", "summary": "https://access.redhat.com/errata/RHSA-2026:20087", "url": "https://access.redhat.com/errata/RHSA-2026:20087" }, { "category": "external", "summary": "https://access.redhat.com/errata/RHSA-2026:20129", "url": "https://access.redhat.com/errata/RHSA-2026:20129" }, { "category": "external", "summary": "https://access.redhat.com/errata/RHSA-2026:20130", "url": "https://access.redhat.com/errata/RHSA-2026:20130" }, { "category": "external", "summary": "https://access.redhat.com/errata/RHSA-2026:20299", "url": "https://access.redhat.com/errata/RHSA-2026:20299" }, { "category": "external", "summary": "https://access.redhat.com/errata/RHSA-2026:20593", "url": "https://access.redhat.com/errata/RHSA-2026:20593" }, { "category": "external", "summary": "https://access.redhat.com/errata/RHSA-2026:21656", "url": "https://access.redhat.com/errata/RHSA-2026:21656" }, { "category": "external", "summary": "https://access.redhat.com/errata/RHSA-2026:21690", "url": "https://access.redhat.com/errata/RHSA-2026:21690" }, { "category": "external", "summary": "https://access.redhat.com/errata/RHSA-2026:21695", "url": "https://access.redhat.com/errata/RHSA-2026:21695" }, { "category": "external", "summary": "https://access.redhat.com/errata/RHSA-2026:21702", "url": "https://access.redhat.com/errata/RHSA-2026:21702" }, { "category": "external", "summary": "https://access.redhat.com/errata/RHSA-2026:23233", "url": "https://access.redhat.com/errata/RHSA-2026:23233" }, { "category": "external", "summary": "https://access.redhat.com/errata/RHSA-2026:23240", "url": "https://access.redhat.com/errata/RHSA-2026:23240" }, { "category": "external", "summary": "https://access.redhat.com/errata/RHSA-2026:23245", "url": "https://access.redhat.com/errata/RHSA-2026:23245" }, { "category": "external", "summary": "https://access.redhat.com/errata/RHSA-2026:23468", "url": "https://access.redhat.com/errata/RHSA-2026:23468" }, { "category": "external", "summary": "https://access.redhat.com/errata/RHSA-2026:23469", "url": "https://access.redhat.com/errata/RHSA-2026:23469" }, { "category": "external", "summary": "https://access.redhat.com/errata/RHSA-2026:23470", "url": "https://access.redhat.com/errata/RHSA-2026:23470" }, { "category": "external", "summary": "https://access.redhat.com/errata/RHSA-2026:23471", "url": "https://access.redhat.com/errata/RHSA-2026:23471" }, { "category": "external", "summary": "https://access.redhat.com/errata/RHSA-2026:24814", "url": "https://access.redhat.com/errata/RHSA-2026:24814" }, { "category": "external", "summary": "https://access.redhat.com/errata/RHSA-2026:25044", "url": "https://access.redhat.com/errata/RHSA-2026:25044" }, { "category": "external", "summary": "https://access.redhat.com/errata/RHSA-2026:33486", "url": "https://access.redhat.com/errata/RHSA-2026:33486" }, { "category": "external", "summary": "https://access.redhat.com/security/cve/CVE-2026-43503", "url": "https://access.redhat.com/security/cve/CVE-2026-43503" }, { "category": "external", "summary": "https://bugzilla.redhat.com/show_bug.cgi?id=2480902", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2480902" }, { "category": "external", "summary": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-43503.json", "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-43503.json" } ], "release_date": "2026-05-23T12:17:00Z", "remediations": [ { "category": "none_available", "date": "2026-08-25T12:14:37.091415Z", "details": "Affected", "product_ids": [ "Debian-10:hyperv-daemons-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:libbpf-dev-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:libbpf4.19-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:libcpupower-dev-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:libcpupower1-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-compiler-gcc-8-x86-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-config-4.19-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-cpupower-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-doc-4.19-0:4.19.325-1+tuxcare.els1.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-amd64-0:4.19.325-1+tuxcare.els1.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-common-0:4.19.325-1+tuxcare.els1.all", "Debian-10:linux-image-4.19.0-28-amd64-unsigned-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-image-amd64-signed-template-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-kbuild-4.19-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-libc-dev-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-perf-4.19-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-source-4.19-0:4.19.325-1+tuxcare.els1.all", "Debian-10:linux-support-4.19.0-28-0:4.19.325-1+tuxcare.els1.all" ] } ], "scores": [ { "cvss_v3": { "attackComplexity": "HIGH", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.0, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1" }, "products": [ "Debian-10:hyperv-daemons-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:libbpf-dev-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:libbpf4.19-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:libcpupower-dev-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:libcpupower1-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-compiler-gcc-8-x86-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-config-4.19-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-cpupower-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-doc-4.19-0:4.19.325-1+tuxcare.els1.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-amd64-0:4.19.325-1+tuxcare.els1.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-common-0:4.19.325-1+tuxcare.els1.all", "Debian-10:linux-image-4.19.0-28-amd64-unsigned-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-image-amd64-signed-template-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-kbuild-4.19-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-libc-dev-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-perf-4.19-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-source-4.19-0:4.19.325-1+tuxcare.els1.all", "Debian-10:linux-support-4.19.0-28-0:4.19.325-1+tuxcare.els1.all" ] } ], "threats": [ { "category": "impact", "details": "Important" } ] } ] }