--- id: CVE-2026-97417 title: |- In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_conntrack: use get_unaligned_be32() in tcp_sack() The timestamp-only fast path dereferences the option stream as *(__be32 *)ptr, which assumes 4-byte ali… summary: |- In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_conntrack: use get_unaligned_be32() in tcp_sack() The timestamp-only fast path dereferences the option stream as *(__be32 *)ptr, which assumes 4-byte ali… severity: high cvss: 7.5 cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H' cwe: - CWE-843 vendor: Linux product: Linux affected: - >- Linux >= bb9fc37358ffa9de1cc2b2b6f1a559b926ef50d9 < 740ad3d17a281f7764dda4dbeb37cea52e2e31ae - >- Linux >= bb9fc37358ffa9de1cc2b2b6f1a559b926ef50d9 < a0523267de2523522b0f70972dd1ffa22ec6176c - >- Linux >= bb9fc37358ffa9de1cc2b2b6f1a559b926ef50d9 < 55bcc3376cd7b18954cc9814da697504fdaf12bf - >- Linux >= bb9fc37358ffa9de1cc2b2b6f1a559b926ef50d9 < 0d5ad732e4fdc569eb85861115e8f7b4c2c67852 - >- Linux >= bb9fc37358ffa9de1cc2b2b6f1a559b926ef50d9 < 7ecfa46a536578a7ed335ddf31a854127268c27c - >- Linux >= bb9fc37358ffa9de1cc2b2b6f1a559b926ef50d9 < 4abc1af7ac209c066f4e5dd75cdd56876e5829a9 - >- Linux >= bb9fc37358ffa9de1cc2b2b6f1a559b926ef50d9 < d3bf9eae486490832bd08fd62ab0ac601f346bd4 - Linux 3.1 published: '2026-09-24' updated: '2026-10-03' sourceUpdated: '2026-10-03T11:17:53.747' source: NVD sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-97417' references: - url: 'https://git.kernel.org/stable/c/0d5ad732e4fdc569eb85861115e8f7b4c2c67852' label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 - url: 'https://git.kernel.org/stable/c/4abc1af7ac209c066f4e5dd75cdd56876e5829a9' label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 - url: 'https://git.kernel.org/stable/c/55bcc3376cd7b18954cc9814da697504fdaf12bf' label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 - url: 'https://git.kernel.org/stable/c/740ad3d17a281f7764dda4dbeb37cea52e2e31ae' label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 - url: 'https://git.kernel.org/stable/c/7ecfa46a536578a7ed335ddf31a854127268c27c' label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 - url: 'https://git.kernel.org/stable/c/a0523267de2523522b0f70972dd1ffa22ec6176c' label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 - url: 'https://git.kernel.org/stable/c/d3bf9eae486490832bd08fd62ab0ac601f346bd4' label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 - url: >- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-97417.json - url: 'https://access.redhat.com/security/cve/CVE-2026-97417' - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2540479' - url: 'https://www.cve.org/CVERecord?id=CVE-2026-97417' - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-97417' - url: >- https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-97417.mbox - url: 'https://access.redhat.com/errata/RHSA-2026:76738' - url: 'https://access.redhat.com/errata/RHSA-2026:76739' - url: 'https://access.redhat.com/errata/RHSA-2026:75747' - url: 'https://access.redhat.com/errata/RHSA-2026:75746' tags: - nvd - cve.org - csaf - vex - red-hat epss: 0.0049 epssPercentile: 0.41926 ingestedAt: '2026-09-24T16:47:15.885Z' patched: - 10base_smtv - enterprise_linux_appstream_v_10 - enterprise_linux_appstream_v_9 - enterprise_linux_baseos_v_10 - enterprise_linux_baseos_v_8 - 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_hidden_v_10 - enterprise_linux_real_time_for_nfv_v_10 - enterprise_linux_nfv_v_8 - enterprise_linux_real_time_for_nfv_v_9 - enterprise_linux_real_time_v_10 - enterprise_linux_rt_v_8 - enterprise_linux_real_time_v_9 --- ## Overview In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_conntrack: use get_unaligned_be32() in tcp_sack() The timestamp-only fast path dereferences the option stream as *(__be32 *)ptr, which assumes 4-byte alignment that the TCP option stream does not guarantee. Use get_unaligned_be32() instead, which reads the value safely and already returns host byte order, so the htonl() on the comparison constant can be dropped. This matches the existing get_unaligned_be32() use later in the same function. ## Remediation Refer to the linked advisories for vendor-supplied fixes and affected version ranges. ## Vendor advisories - **Red Hat VEX** · Important · affected: Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · updated 2026-10-26 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-97417.json) - **RHSA-2026:76738** · Red Hat · fixed in: 10Base-SMTV, 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 Hidden (v. 10), Red Hat Enterprise Linux Real Time for NFV (v. 10), … · released 2026-10-08 · [advisory](https://access.redhat.com/errata/RHSA-2026:76738) - **RHSA-2026:76739** · 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 2026-10-08 · [advisory](https://access.redhat.com/errata/RHSA-2026:76739) - **RHSA-2026:75747** · Red Hat · fixed in: Red Hat Enterprise Linux BaseOS (v. 8), Red Hat Enterprise Linux CRB (v. 8) · released 2026-10-05 · [advisory](https://access.redhat.com/errata/RHSA-2026:75747) - **RHSA-2026:75746** · Red Hat · fixed in: Red Hat Enterprise Linux NFV (v. 8), Red Hat Enterprise Linux RT (v. 8) · released 2026-10-05 · [advisory](https://access.redhat.com/errata/RHSA-2026:75746)