{ "cveId": "CVE-2026-98955", "url": "https://patchblox.com/security/cve/CVE-2026-98955", "summary": "CVE-2026-98955 is fixed in 19 products on 1 platform, first by DEBIAN-CVE-2026-98955, released October 24, 2026. It is not reported as exploited. Patch Radar priority: Routine.", "title": "flow_dissector: avoid u16 truncation of skb-\u003Elen when computing thoff", "description": "In the Linux kernel, the following vulnerability has been resolved: flow_dissector: avoid u16 truncation of skb-\u003Elen when computing thoff __skb_flow_dissect() computes key_control-\u003Ethoff using: key_control-\u003Ethoff = min_t(u16, nhoff, skb ? skb-\u003Elen : hlen); min_t(u16, ...) casts both arguments to u16 before comparing them. Whenever skb-\u003Elen (or hlen) modulo 65536 is smaller than nhoff, the truncated length wins and thoff is set to a bogus small value, even when the dissection succeeded. For example, an IPv4/TCP frame with skb-\u003Elen == 65540 and nhoff == 34 gets thoff == 4, so callers such as skb_probe_transport_header() point the transport header inside the Ethernet header. Such skbs are not exotic: - At the time of commit d0c081b49137 (\u0022flow_dissector: properly cap thoff field\u0022), AF_PACKET with PACKET_VNET_HDR could already build GSO skbs larger than 64KB (MTU checks are skipped for GSO, and alloc_skb_with_frags() accepted up to MAX_SKB_FRAGS (17) order-0 pages on top of the linear part). - BIG TCP now makes skbs larger than 64KB common. - The following patch makes tun_get_user() dissect IFF_TAP frames before eth_type_trans() pulls the Ethernet header, so a GSO frame carrying a 65522..65535 byte L3 packet will be dissected with skb-\u003Elen in [65536, 65549]. Compare as u32 instead. If the resulting offset cannot be represented in the u16 key_control-\u003Ethoff, cap it to U16_MAX and report the dissection as failed rather than silently returning a wrong transport offset. thoff is still set on failure, as some callers (such as eth_get_headlen()) use it regardless of the return value.", "published": "2026-10-23T13:17:16Z", "severity": "Low", "cvss": 3.4, "epss": 0.00211, "epssPercentile": 0.11398, "priority": "Routine", "priorityTier": 4, "exploited": false, "vendorExploited": false, "disclosed": false, "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-98955", "fixes": [ { "platform": "linux", "product": "bpftool6.12", "release": "amzn 2023", "fixedVersion": "1:6.12.113-138.209.amzn2023", "fix": "ALAS2023-2026-3335", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3335", "released": "2026-11-07T01:06:52Z" }, { "platform": "linux", "product": "bpftool6.12-debuginfo", "release": "amzn 2023", "fixedVersion": "1:6.12.113-138.209.amzn2023", "fix": "ALAS2023-2026-3335", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3335", "released": "2026-11-07T01:06:52Z" }, { "platform": "linux", "product": "kernel-livepatch-6.12.113-138.209", "release": "amzn 2023", "fixedVersion": "1:1.0-0.amzn2023", "fix": "ALAS2023-2026-3335", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3335", "released": "2026-11-07T01:06:52Z" }, { "platform": "linux", "product": "kernel6.12", "release": "amzn 2023", "fixedVersion": "1:6.12.113-138.209.amzn2023", "fix": "ALAS2023-2026-3335", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3335", "released": "2026-11-07T01:06:52Z" }, { "platform": "linux", "product": "kernel6.12-debuginfo", "release": "amzn 2023", "fixedVersion": "1:6.12.113-138.209.amzn2023", "fix": "ALAS2023-2026-3335", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3335", "released": "2026-11-07T01:06:52Z" }, { "platform": "linux", "product": "kernel6.12-debuginfo-common-aarch64", "release": "amzn 2023", "fixedVersion": "1:6.12.113-138.209.amzn2023", "fix": "ALAS2023-2026-3335", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3335", "released": "2026-11-07T01:06:52Z" }, { "platform": "linux", "product": "kernel6.12-debuginfo-common-x86_64", "release": "amzn 2023", "fixedVersion": "1:6.12.113-138.209.amzn2023", "fix": "ALAS2023-2026-3335", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3335", "released": "2026-11-07T01:06:52Z" }, { "platform": "linux", "product": "kernel6.12-devel", "release": "amzn 2023", "fixedVersion": "1:6.12.113-138.209.amzn2023", "fix": "ALAS2023-2026-3335", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3335", "released": "2026-11-07T01:06:52Z" }, { "platform": "linux", "product": "kernel6.12-headers", "release": "amzn 2023", "fixedVersion": "1:6.12.113-138.209.amzn2023", "fix": "ALAS2023-2026-3335", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3335", "released": "2026-11-07T01:06:52Z" }, { "platform": "linux", "product": "kernel6.12-modules-extra", "release": "amzn 2023", "fixedVersion": "1:6.12.113-138.209.amzn2023", "fix": "ALAS2023-2026-3335", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3335", "released": "2026-11-07T01:06:52Z" }, { "platform": "linux", "product": "kernel6.12-modules-extra-common", "release": "amzn 2023", "fixedVersion": "1:6.12.113-138.209.amzn2023", "fix": "ALAS2023-2026-3335", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3335", "released": "2026-11-07T01:06:52Z" }, { "platform": "linux", "product": "kernel6.12-tools", "release": "amzn 2023", "fixedVersion": "1:6.12.113-138.209.amzn2023", "fix": "ALAS2023-2026-3335", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3335", "released": "2026-11-07T01:06:52Z" }, { "platform": "linux", "product": "kernel6.12-tools-debuginfo", "release": "amzn 2023", "fixedVersion": "1:6.12.113-138.209.amzn2023", "fix": "ALAS2023-2026-3335", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3335", "released": "2026-11-07T01:06:52Z" }, { "platform": "linux", "product": "kernel6.12-tools-devel", "release": "amzn 2023", "fixedVersion": "1:6.12.113-138.209.amzn2023", "fix": "ALAS2023-2026-3335", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3335", "released": "2026-11-07T01:06:52Z" }, { "platform": "linux", "product": "linux", "release": "Debian 13.5 (trixie)", "fixedVersion": "6.12.113-1", "fix": "DEBIAN-CVE-2026-98955", "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-98955", "released": "2026-10-24T13:25:57Z" }, { "platform": "linux", "product": "linux", "release": "Debian 14", "fixedVersion": "7.2.11-1", "fix": "DEBIAN-CVE-2026-98955", "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-98955", "released": "2026-10-24T13:25:57Z" }, { "platform": "linux", "product": "perf6.12", "release": "amzn 2023", "fixedVersion": "1:6.12.113-138.209.amzn2023", "fix": "ALAS2023-2026-3335", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3335", "released": "2026-11-07T01:06:52Z" }, { "platform": "linux", "product": "perf6.12-debuginfo", "release": "amzn 2023", "fixedVersion": "1:6.12.113-138.209.amzn2023", "fix": "ALAS2023-2026-3335", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3335", "released": "2026-11-07T01:06:52Z" }, { "platform": "linux", "product": "python3-perf6.12", "release": "amzn 2023", "fixedVersion": "1:6.12.113-138.209.amzn2023", "fix": "ALAS2023-2026-3335", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3335", "released": "2026-11-07T01:06:52Z" }, { "platform": "linux", "product": "python3-perf6.12-debuginfo", "release": "amzn 2023", "fixedVersion": "1:6.12.113-138.209.amzn2023", "fix": "ALAS2023-2026-3335", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3335", "released": "2026-11-07T01:06:52Z" } ], "noFixYet": [], "dataAsOf": "2026-11-08T13:06:02Z", "attribution": { "text": "Data: Patchblox Patch Radar", "url": "https://patchblox.com/security/patch-radar", "terms": "https://patchblox.com/security/patch-radar/use-the-data" } }