P4Verified

CVE-2026-63994: linux kernel from 5.9 (inclusive), before 5.10.259 (exclusive), from 5.11 (inclusive), before 5.15.210 (exclusive)…

CVE-2026-63994. CVSS 3.1 base score 9.8 (CRITICAL, Source advisory). EPSS 0.00514 (percentile 0.4184), scored 2026-10-06.

Affected technology

linux kernel · from 5.9 (inclusive), before 5.10.259 (exclusive)
linux

linux kernel · from 5.11 (inclusive), before 5.15.210 (exclusive)
linux

linux kernel · from 5.16 (inclusive), before 6.1.176 (exclusive)
linux

linux kernel · from 6.2 (inclusive), before 6.6.143 (exclusive)
linux

linux kernel · from 6.7 (inclusive), before 6.12.93 (exclusive)
linux

linux kernel · from 6.13 (inclusive), before 6.18.35 (exclusive)
linux

linux kernel · from 6.19 (inclusive), before 7.0.12 (exclusive)
linux

linux kernel · 7.1 · update rc1
linux

linux kernel · 7.1 · update rc2
linux

linux kernel · 7.1 · update rc3
linux

linux kernel · 7.1 · update rc4
linux

linux kernel · 7.1 · update rc5
linux

Linux · 4cb47a8644cc9eb8ec81190a50e79e6530d0297f to before 95b6d772bfe788331d9742d73eaa12e113b2adc4, 4cb47a8644cc9eb8ec81190a50e79e6530d0297f to before 7254aef4d1a7e18e887af9010e2f2dc34806789b, 4cb47a8644cc9eb8ec81190a50e79e6530d0297f to before bf8b3f34c37c162357138e7c0942723b8b94fed1, 4cb47a8644cc9eb8ec81190a50e79e6530d0297f to before 76cd9398a0470257ab765bdf5f358a2af2e17934, 4cb47a8644cc9eb8ec81190a50e79e6530d0297f to before 50750d86a2e5266aba0c295483b3397843198b11, 4cb47a8644cc9eb8ec81190a50e79e6530d0297f to before 6dff77899b9e9fe5d854abda3a98ad04e7229ef7, 4cb47a8644cc9eb8ec81190a50e79e6530d0297f to before f3f204541f280a6ecb04503a0d6794d93990ca43, 4cb47a8644cc9eb8ec81190a50e79e6530d0297f to before b4bc94353050b1fa7b702bd4c6600710dd926cff
Linux

Linux · 5.9
Linux

Component: Not specified by the source
File: net/ipv4/ip_tunnel_core.c

Attack conditions (Source advisory, CVSS 3.1): Network (remote) · No privileges required · No user interaction required

What an attacker can do

Source advisory’s CVSS 3.1 assessment (base score 9.8/10) rates confidentiality, integrity and availability impact as high. The description does not specify what an attacker can achieve beyond these rated impacts.

Published 2026-10-07 23:05:35.647979+00:00

CWE: CWE-416
CCR priority: 39.3 /100 (P4)
CVSS 3.1: 9.8 /10 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H · Source advisory
EPSS: 0.00514 · percentile 0.4184 · 2026-10-06
KEV: no

Provenance

NVD CVE API 2.0 · Source record · observed 2026-10-07 23:02:50.240617+00:00 UTC

Stable permalink: https://cybercodered.org/item/cve-cve-2026-63994.html