--- id: CVE-2026-74669 title: |- In the Linux kernel, the following vulnerability has been resolved: ipvs: clear IPv4 options after rebasing tunnel ICMP errors ip_vs_in_icmp() rebases an skb from the outer ICMP packet to the quoted original request before passing it t… summary: |- In the Linux kernel, the following vulnerability has been resolved: ipvs: clear IPv4 options after rebasing tunnel ICMP errors ip_vs_in_icmp() rebases an skb from the outer ICMP packet to the quoted original request before passing it t… severity: critical cvss: 9.8 cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H' cwe: - CWE-787 vendor: Linux product: Linux affected: - >- Linux >= f2edb9f7706dcb2c0d9a362b2ba849efe3a97f5e < 79ffa99202c944467e28b13b513bf2998732edff - >- Linux >= f2edb9f7706dcb2c0d9a362b2ba849efe3a97f5e < c9413b50204738fbc429bb86bf01353c393a6c28 - >- Linux >= f2edb9f7706dcb2c0d9a362b2ba849efe3a97f5e < 37c61b3745129cbd682c557b51345828120972e5 - >- Linux >= f2edb9f7706dcb2c0d9a362b2ba849efe3a97f5e < ed246dd85ebf27c1f6b7897834d40786c0ca3006 - >- Linux >= f2edb9f7706dcb2c0d9a362b2ba849efe3a97f5e < 6f46fc460e9316062bdcdf89199eb5d7a33da33b - >- Linux >= f2edb9f7706dcb2c0d9a362b2ba849efe3a97f5e < 75eec935444db4af2123e0491936f6e273d7ea00 - >- Linux >= f2edb9f7706dcb2c0d9a362b2ba849efe3a97f5e < 384b4dae14277d369221d187e9b3af56c79d2e50 - >- Linux >= f2edb9f7706dcb2c0d9a362b2ba849efe3a97f5e < e0ba936287dfe9783426aac27e5fd76fe35b38c9 - Linux 3.7 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 published: '2026-08-22' updated: '2026-10-16' sourceUpdated: '2026-10-16T20:17:51.090' source: NVD sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-74669' references: - url: 'https://git.kernel.org/stable/c/37c61b3745129cbd682c557b51345828120972e5' label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 - url: 'https://git.kernel.org/stable/c/384b4dae14277d369221d187e9b3af56c79d2e50' label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 - url: 'https://git.kernel.org/stable/c/6f46fc460e9316062bdcdf89199eb5d7a33da33b' label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 - url: 'https://git.kernel.org/stable/c/75eec935444db4af2123e0491936f6e273d7ea00' label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 - url: 'https://git.kernel.org/stable/c/79ffa99202c944467e28b13b513bf2998732edff' label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 - url: 'https://git.kernel.org/stable/c/c9413b50204738fbc429bb86bf01353c393a6c28' label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 - url: 'https://git.kernel.org/stable/c/e0ba936287dfe9783426aac27e5fd76fe35b38c9' label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 - url: 'https://git.kernel.org/stable/c/ed246dd85ebf27c1f6b7897834d40786c0ca3006' label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 - url: >- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-74669.json - url: 'https://access.redhat.com/security/cve/CVE-2026-74669' - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2521375' - url: 'https://www.cve.org/CVERecord?id=CVE-2026-74669' - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-74669' - url: >- https://lore.kernel.org/linux-cve-announce/2026082229-CVE-2026-74669-f574@gregkh/T - 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: 0.00514 epssPercentile: 0.43609 ssvc: exploitation: none automatable: 'yes' technicalImpact: total timestamp: '2026-10-16T19:14:21.602938Z' scores: nvd: 9.8 vendor: 8.8 ingestedAt: '2026-10-14T13:30:58.532Z' --- ## Overview In the Linux kernel, the following vulnerability has been resolved: ipvs: clear IPv4 options after rebasing tunnel ICMP errors ip_vs_in_icmp() rebases an skb from the outer ICMP packet to the quoted original request before passing it to icmp_send(). However, IPCB(skb)->opt still describes the outer IPv4 header. A timestamp option in the outer header can therefore leave an offset that points into the quoted transport header after the rebase. __ip_options_echo() treats a byte at that stale location as the option length and copies it into the fixed-size option storage on the __icmp_send() stack, causing a stack out-of-bounds write. Clear the stale option metadata after resetting the network header. Keep the remaining control block fields, including the ingress interface used by the ICMP response path. ## Remediation Refer to the linked advisories for vendor-supplied fixes and affected version ranges. ## Vendor advisories - **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) - **Red Hat VEX** · Important · affected: Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 9 · no fix planned: Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 9 · updated 2026-10-26 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-74669.json)