{"id":"CVE-2026-53091","title":"net: pull headers in qdisc_pkt_len_segs_init()","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: pull headers in qdisc_pkt_len_segs_init()\n\nMost ndo_start_xmit() methods expects headers of gso packets\nto be already in skb->head.\n\nnet/core/tso.c users are parti…","severity":"high","cvss":8.4,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:H","cvssSource":"cna","cwe":["CWE-131"],"vendor":"Linux","product":"Linux","affected":["Linux >= e876f208af18b074f800656e4d1b99da75b2135f < 5895cfc76924a629c6eaa5e5f049de642860045f","Linux >= e876f208af18b074f800656e4d1b99da75b2135f < 7564dc804d8289d2e5c6edb8173754051b71bff4","Linux >= e876f208af18b074f800656e4d1b99da75b2135f < 9d4f5c68f5ad4ab425f3ce1500c97c9f9743999a","Linux >= e876f208af18b074f800656e4d1b99da75b2135f < 7fb4c19670110f052c04e1ec1d2b953b9f4f57e4","Linux 3.16"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-10-16T15:25:34.531794Z"},"published":"2026-06-24","updated":"2026-10-21","sourceUpdated":"2026-10-21T12:41:56.505Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-53091","references":[{"url":"https://git.kernel.org/stable/c/5895cfc76924a629c6eaa5e5f049de642860045f"},{"url":"https://git.kernel.org/stable/c/7564dc804d8289d2e5c6edb8173754051b71bff4"},{"url":"https://git.kernel.org/stable/c/9d4f5c68f5ad4ab425f3ce1500c97c9f9743999a"},{"url":"https://git.kernel.org/stable/c/7fb4c19670110f052c04e1ec1d2b953b9f4f57e4"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-53091.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-53091"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2492270"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-53091"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-53091"},{"url":"https://lore.kernel.org/linux-cve-announce/2026062409-CVE-2026-53091-cb58@gregkh/T"},{"url":"https://access.redhat.com/errata/RHSA-2026:65334"},{"url":"https://access.redhat.com/errata/RHSA-2026:73645"},{"url":"https://access.redhat.com/errata/RHSA-2026:67150"},{"url":"https://access.redhat.com/errata/RHSA-2026:66325"},{"url":"https://access.redhat.com/errata/RHSA-2026:66324"}],"tags":["cve.org","csaf","vex","red-hat"],"epss":0.00139,"epssPercentile":0.03244,"patched":["enterprise_linux_appstream_v_10","enterprise_linux_appstream_e4s_v_9_4","enterprise_linux_appstream_v_9","enterprise_linux_baseos_v_10","enterprise_linux_baseos_v_8","enterprise_linux_baseos_e4s_v_9_4","enterprise_linux_baseos_v_9","enterprise_linux_codeready_linux_builder_v_10","enterprise_linux_crb_v_8","enterprise_linux_codeready_linux_builder_v_9","enterprise_linux_real_time_for_nfv_v_10","enterprise_linux_nfv_v_8","enterprise_linux_real_time_for_nfv_e4s_v_9_4","enterprise_linux_real_time_for_nfv_v_9","enterprise_linux_real_time_v_10","enterprise_linux_rt_v_8","enterprise_linux_real_time_e4s_v_9_4","enterprise_linux_real_time_v_9"],"scores":{"cna":8.4,"vendor":7},"ingestedAt":"2026-09-14T15:23:07.435Z","slug":"CVE-2026-53091","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nnet: pull headers in qdisc_pkt_len_segs_init()\n\nMost ndo_start_xmit() methods expects headers of gso packets\nto be already in skb->head.\n\nnet/core/tso.c users are particularly at risk, because tso_build_hdr()\ndoes a memcpy(hdr, skb->data, hdr_len);\n\nqdisc_pkt_len_segs_init() already does a dissection of gso packets.\n\nUse pskb_may_pull() instead of skb_header_pointer() to make\nsure drivers do not have to reimplement this.\n\nSome malicious packets could be fed, detect them so that we can\ndrop them sooner with a new SKB_DROP_REASON_SKB_BAD_GSO drop_reason.\n\n## Affected\n\n- `Linux >= e876f208af18b074f800656e4d1b99da75b2135f < 5895cfc76924a629c6eaa5e5f049de642860045f`\n- `Linux >= e876f208af18b074f800656e4d1b99da75b2135f < 7564dc804d8289d2e5c6edb8173754051b71bff4`\n- `Linux >= e876f208af18b074f800656e4d1b99da75b2135f < 9d4f5c68f5ad4ab425f3ce1500c97c9f9743999a`\n- `Linux >= e876f208af18b074f800656e4d1b99da75b2135f < 7fb4c19670110f052c04e1ec1d2b953b9f4f57e4`\n- `Linux 3.16`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **RHSA-2026:65334** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 10), Red Hat Enterprise Linux BaseOS (v. 10), Red Hat Enterprise Linux CodeReady Linux Builder (v. 10), Red Hat Enterprise Linux Real Time for NFV (v. 10), Red Hat Enterprise Linux Real Time (v. 10) · released 2026-09-08 · [advisory](https://access.redhat.com/errata/RHSA-2026:65334)\n- **RHSA-2026:73645** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream E4S (v.9.4), Red Hat Enterprise Linux BaseOS E4S (v.9.4), Red Hat Enterprise Linux Real Time for NFV E4S (v.9.4), Red Hat Enterprise Linux Real Time E4S (v.9.4) · released 2026-09-30 · [advisory](https://access.redhat.com/errata/RHSA-2026:73645)\n- **RHSA-2026:67150** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 9), Red Hat Enterprise Linux BaseOS (v. 9), Red Hat Enterprise Linux CodeReady Linux Builder (v. 9), Red Hat Enterprise Linux Real Time for NFV (v. 9), Red Hat Enterprise Linux Real Time (v. 9) · released 2026-09-14 · [advisory](https://access.redhat.com/errata/RHSA-2026:67150)\n- **RHSA-2026:66325** · Red Hat · fixed in: Red Hat Enterprise Linux BaseOS (v. 8), Red Hat Enterprise Linux CRB (v. 8) · released 2026-09-10 · [advisory](https://access.redhat.com/errata/RHSA-2026:66325)\n- **RHSA-2026:66324** · Red Hat · fixed in: Red Hat Enterprise Linux NFV (v. 8), Red Hat Enterprise Linux RT (v. 8) · released 2026-09-10 · [advisory](https://access.redhat.com/errata/RHSA-2026:66324)\n- **Red Hat VEX** · Important · affected: Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 9, Red Hat Enterprise Linux 6 · no fix planned: Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 9 · updated 2026-09-30 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-53091.json)","depth":"twilight","depthScore":46,"depthScoreParts":{"impact":46.2,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":223100,"id":"CVE-2026-53091","ts":1792172257151,"field":"cvss","old":"7","new":"8.4"},{"seq":214159,"id":"CVE-2026-53091","ts":1790841284773,"field":"cvss","old":"8.4","new":"7"}]}