{"id":"CVE-2026-98031","title":"In the Linux kernel, the following vulnerability has been resolved:\n\nnexthop: Initialize extack in remove_nh_grp_entry()\n\nremove_nh_grp_entry() prints the extack message when a listener fails\nto replace the reduced nexthop group","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nnexthop: Initialize extack in remove_nh_grp_entry()\n\nremove_nh_grp_entry() prints the extack message when a listener fails\nto replace the reduced nexthop group. However…","severity":"medium","cvss":5.5,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","cwe":["CWE-824"],"vendor":"Linux","product":"Linux","affected":["Linux >= 833a1065eeb14437a9a0dfa9dad06ea09894e0b5 < 35d9ec61466109ef0c2de87067338d929f629527","Linux >= 833a1065eeb14437a9a0dfa9dad06ea09894e0b5 < 704319510af2179cf03955747d714ab291075c25","Linux >= 833a1065eeb14437a9a0dfa9dad06ea09894e0b5 < 17acbcd4c5a6ca3dd3f9e52eb203c9175bde609a","Linux >= 833a1065eeb14437a9a0dfa9dad06ea09894e0b5 < 030c878eaedf0449e2b5401a0a0146d0afcc645e","Linux >= 833a1065eeb14437a9a0dfa9dad06ea09894e0b5 < d643cea4248668dc493c513aa7cbc6505eb1a4a9","Linux >= 833a1065eeb14437a9a0dfa9dad06ea09894e0b5 < d80677ad7aa5bebfccfd58caa4852b65abe70561","Linux >= 833a1065eeb14437a9a0dfa9dad06ea09894e0b5 < 5bd9e4e7cdaa03879e9b73b12ab52cceb1edd55b","Linux 5.11"],"published":"2026-09-25","updated":"2026-10-03","sourceUpdated":"2026-10-03T11:18:26.073","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-98031","references":[{"url":"https://git.kernel.org/stable/c/030c878eaedf0449e2b5401a0a0146d0afcc645e","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/17acbcd4c5a6ca3dd3f9e52eb203c9175bde609a","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/35d9ec61466109ef0c2de87067338d929f629527","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/5bd9e4e7cdaa03879e9b73b12ab52cceb1edd55b","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/704319510af2179cf03955747d714ab291075c25","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/d643cea4248668dc493c513aa7cbc6505eb1a4a9","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/d80677ad7aa5bebfccfd58caa4852b65abe70561","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98031.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-98031"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2541247"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-98031"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-98031"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98031.mbox"}],"tags":["nvd","cve.org","csaf","vex","red-hat"],"epss":0.00173,"epssPercentile":0.06624,"cvssSource":"vendor","ingestedAt":"2026-09-25T11:06:38.852Z","slug":"CVE-2026-98031","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nnexthop: Initialize extack in remove_nh_grp_entry()\n\nremove_nh_grp_entry() prints the extack message when a listener fails\nto replace the reduced nexthop group. However, extack is not\ninitialized and listeners are not required to set a message when\nreturning an error. Neither netdevsim nor mlxsw do so when an\nallocation fails, resulting in the dereference of an uninitialized\nstack pointer.\n\nFix by zero-initializing extack, as was done in commit 6347c5314cee\n(\"nexthop: initialize extack in nh_res_bucket_migrate()\").\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · updated 2026-10-17 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98031.json)","depth":"sunlit","depthScore":30,"depthScoreParts":{"impact":30.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":212454,"id":"CVE-2026-98031","ts":1790668182964,"field":"cvss","old":null,"new":"5.5"},{"seq":212453,"id":"CVE-2026-98031","ts":1790668182964,"field":"severity","old":"none","new":"medium"}]}