{"id":"CVE-2026-98031","state":"PUBLISHED","title":"nexthop: Initialize extack in remove_nh_grp_entry()","description":"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, 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()\").","publishedAt":"2026-09-25T10:23:47.562Z","updatedAt":"2026-10-19T09:12:36.306Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"833a1065eeb14437a9a0dfa9dad06ea09894e0b5","status":"affected","lessThan":"35d9ec61466109ef0c2de87067338d929f629527","versionType":"git"},{"version":"833a1065eeb14437a9a0dfa9dad06ea09894e0b5","status":"affected","lessThan":"704319510af2179cf03955747d714ab291075c25","versionType":"git"},{"version":"833a1065eeb14437a9a0dfa9dad06ea09894e0b5","status":"affected","lessThan":"17acbcd4c5a6ca3dd3f9e52eb203c9175bde609a","versionType":"git"},{"version":"833a1065eeb14437a9a0dfa9dad06ea09894e0b5","status":"affected","lessThan":"030c878eaedf0449e2b5401a0a0146d0afcc645e","versionType":"git"},{"version":"833a1065eeb14437a9a0dfa9dad06ea09894e0b5","status":"affected","lessThan":"d643cea4248668dc493c513aa7cbc6505eb1a4a9","versionType":"git"},{"version":"833a1065eeb14437a9a0dfa9dad06ea09894e0b5","status":"affected","lessThan":"d80677ad7aa5bebfccfd58caa4852b65abe70561","versionType":"git"},{"version":"833a1065eeb14437a9a0dfa9dad06ea09894e0b5","status":"affected","lessThan":"5bd9e4e7cdaa03879e9b73b12ab52cceb1edd55b","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/ipv4/nexthop.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.11","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.11","versionType":"semver"},{"version":"5.15.222","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.189","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.158","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.111","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.53","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.7","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/ipv4/nexthop.c"]}],"references":["https://git.kernel.org/stable/c/35d9ec61466109ef0c2de87067338d929f629527","https://git.kernel.org/stable/c/704319510af2179cf03955747d714ab291075c25","https://git.kernel.org/stable/c/17acbcd4c5a6ca3dd3f9e52eb203c9175bde609a","https://git.kernel.org/stable/c/030c878eaedf0449e2b5401a0a0146d0afcc645e","https://git.kernel.org/stable/c/d643cea4248668dc493c513aa7cbc6505eb1a4a9","https://git.kernel.org/stable/c/d80677ad7aa5bebfccfd58caa4852b65abe70561","https://git.kernel.org/stable/c/5bd9e4e7cdaa03879e9b73b12ab52cceb1edd55b"],"weaknesses":[],"ingestedAt":"2026-10-29T20:13:43.249Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/98xxx/CVE-2026-98031.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-98031","state":"PUBLISHED","datePublished":"2026-09-25T10:23:47.562Z","dateUpdated":"2026-10-19T09:12:36.306Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-09-25T10:19:56.070Z"},"containers":{"cna":{"title":"nexthop: Initialize extack in remove_nh_grp_entry()","descriptions":[{"lang":"en","value":"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, 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()\")."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"833a1065eeb14437a9a0dfa9dad06ea09894e0b5","status":"affected","lessThan":"35d9ec61466109ef0c2de87067338d929f629527","versionType":"git"},{"version":"833a1065eeb14437a9a0dfa9dad06ea09894e0b5","status":"affected","lessThan":"704319510af2179cf03955747d714ab291075c25","versionType":"git"},{"version":"833a1065eeb14437a9a0dfa9dad06ea09894e0b5","status":"affected","lessThan":"17acbcd4c5a6ca3dd3f9e52eb203c9175bde609a","versionType":"git"},{"version":"833a1065eeb14437a9a0dfa9dad06ea09894e0b5","status":"affected","lessThan":"030c878eaedf0449e2b5401a0a0146d0afcc645e","versionType":"git"},{"version":"833a1065eeb14437a9a0dfa9dad06ea09894e0b5","status":"affected","lessThan":"d643cea4248668dc493c513aa7cbc6505eb1a4a9","versionType":"git"},{"version":"833a1065eeb14437a9a0dfa9dad06ea09894e0b5","status":"affected","lessThan":"d80677ad7aa5bebfccfd58caa4852b65abe70561","versionType":"git"},{"version":"833a1065eeb14437a9a0dfa9dad06ea09894e0b5","status":"affected","lessThan":"5bd9e4e7cdaa03879e9b73b12ab52cceb1edd55b","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/ipv4/nexthop.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.11","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.11","versionType":"semver"},{"version":"5.15.222","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.189","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.158","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.111","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.53","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.7","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/ipv4/nexthop.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/35d9ec61466109ef0c2de87067338d929f629527"},{"url":"https://git.kernel.org/stable/c/704319510af2179cf03955747d714ab291075c25"},{"url":"https://git.kernel.org/stable/c/17acbcd4c5a6ca3dd3f9e52eb203c9175bde609a"},{"url":"https://git.kernel.org/stable/c/030c878eaedf0449e2b5401a0a0146d0afcc645e"},{"url":"https://git.kernel.org/stable/c/d643cea4248668dc493c513aa7cbc6505eb1a4a9"},{"url":"https://git.kernel.org/stable/c/d80677ad7aa5bebfccfd58caa4852b65abe70561"},{"url":"https://git.kernel.org/stable/c/5bd9e4e7cdaa03879e9b73b12ab52cceb1edd55b"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-19T09:12:36.306Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.11","versionEndExcluding":"5.15.222"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.11","versionEndExcluding":"6.1.189"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.11","versionEndExcluding":"6.6.158"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.11","versionEndExcluding":"6.12.111"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.11","versionEndExcluding":"6.18.53"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.11","versionEndExcluding":"7.2.7"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.11","versionEndExcluding":"7.3"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}