{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-64576", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-07-19T15:36:31.798Z", "datePublished": "2026-08-05T08:09:32.529Z", "dateUpdated": "2026-08-05T08:09:32.529Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T08:09:32.529Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnexthop: initialize extack in nh_res_bucket_migrate()\n\nnh_res_bucket_migrate() passes an uninitialized netlink_ext_ack to\ncall_nexthop_res_bucket_notifiers(). When\nnh_notifier_res_bucket_info_init() fails (e.g. the kzalloc returns\n-ENOMEM), the error is propagated back before any notifier sets\nextack._msg, and the error path formats the stale pointer with\npr_err_ratelimited(\"%s\\n\", extack._msg). With CONFIG_INIT_STACK_NONE\nthis dereferences uninitialized stack memory:\n\n Oops: general protection fault, probably for non-canonical address ...\n KASAN: maybe wild-memory-access in range [...]\n RIP: 0010:string (lib/vsprintf.c:730)\n vsnprintf (lib/vsprintf.c:2945)\n _printk (kernel/printk/printk.c:2504)\n nh_res_bucket_migrate (net/ipv4/nexthop.c:1816)\n nh_res_table_upkeep (net/ipv4/nexthop.c:1866)\n rtm_new_nexthop (net/ipv4/nexthop.c:3323)\n rtnetlink_rcv_msg (net/core/rtnetlink.c:7076)\n netlink_sendmsg (net/netlink/af_netlink.c:1900)\n Kernel panic - not syncing: Fatal exception\n\nZero-initialize extack so _msg is NULL on error paths that never set it."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/ipv4/nexthop.c"], "versions": [{"version": "7c37c7e00411b3d1e0c5292368317aca69d1f324", "lessThan": "c0936c131a71657afc635d0db2ab096d15d473e1", "status": "affected", "versionType": "git"}, {"version": "7c37c7e00411b3d1e0c5292368317aca69d1f324", "lessThan": "3081702ea5aca0aeed9c1ade8eadf6cde8db6b7d", "status": "affected", "versionType": "git"}, {"version": "7c37c7e00411b3d1e0c5292368317aca69d1f324", "lessThan": "d536bf205c71f700f6de2086038c3e1d77724715", "status": "affected", "versionType": "git"}, {"version": "7c37c7e00411b3d1e0c5292368317aca69d1f324", "lessThan": "18506d7263768d76ac8e057ba55a4d9da50aad66", "status": "affected", "versionType": "git"}, {"version": "7c37c7e00411b3d1e0c5292368317aca69d1f324", "lessThan": "6347c5314cee49f364aaf2e40ff15415a57a116e", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/ipv4/nexthop.c"], "versions": [{"version": "5.13", "status": "affected"}, {"version": "0", "lessThan": "5.13", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.148", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.101", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.42", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1.6", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2-rc5", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.13", "versionEndExcluding": "6.6.148"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.13", "versionEndExcluding": "6.12.101"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.13", "versionEndExcluding": "6.18.42"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.13", "versionEndExcluding": "7.1.6"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.13", "versionEndExcluding": "7.2-rc5"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/c0936c131a71657afc635d0db2ab096d15d473e1"}, {"url": "https://git.kernel.org/stable/c/3081702ea5aca0aeed9c1ade8eadf6cde8db6b7d"}, {"url": "https://git.kernel.org/stable/c/d536bf205c71f700f6de2086038c3e1d77724715"}, {"url": "https://git.kernel.org/stable/c/18506d7263768d76ac8e057ba55a4d9da50aad66"}, {"url": "https://git.kernel.org/stable/c/6347c5314cee49f364aaf2e40ff15415a57a116e"}], "title": "nexthop: initialize extack in nh_res_bucket_migrate()", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{}

{"bugzilla": {"description": "kernel: nexthop: initialize extack in nh_res_bucket_migrate()", "id": "2511419", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2511419"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-824", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nnexthop: initialize extack in nh_res_bucket_migrate()\nnh_res_bucket_migrate() passes an uninitialized netlink_ext_ack to\ncall_nexthop_res_bucket_notifiers(). When\nnh_notifier_res_bucket_info_init() fails (e.g. the kzalloc returns\n-ENOMEM), the error is propagated back before any notifier sets\nextack._msg, and the error path formats the stale pointer with\npr_err_ratelimited(\"%s\\n\", extack._msg). With CONFIG_INIT_STACK_NONE\nthis dereferences uninitialized stack memory:\nOops: general protection fault, probably for non-canonical address ...\nKASAN: maybe wild-memory-access in range [...]\nRIP: 0010:string (lib/vsprintf.c:730)\nvsnprintf (lib/vsprintf.c:2945)\n_printk (kernel/printk/printk.c:2504)\nnh_res_bucket_migrate (net/ipv4/nexthop.c:1816)\nnh_res_table_upkeep (net/ipv4/nexthop.c:1866)\nrtm_new_nexthop (net/ipv4/nexthop.c:3323)\nrtnetlink_rcv_msg (net/core/rtnetlink.c:7076)\nnetlink_sendmsg (net/netlink/af_netlink.c:1900)\nKernel panic - not syncing: Fatal exception\nZero-initialize extack so _msg is NULL on error paths that never set it.", "A flaw was found in the Linux kernel. During nexthop resolution, an uninitialized variable is used if a memory allocation fails. This can lead to the system attempting to access uninitialized stack memory, causing a general protection fault and a kernel panic. This vulnerability results in a Denial of Service (DoS) on the affected system."], "name": "CVE-2026-64576", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-08-05T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-64576\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-64576\nhttps://lore.kernel.org/linux-cve-announce/2026080524-CVE-2026-64576-38cf@gregkh/T"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[7c37c7e00411b3d1e0c5292368317aca69d1f324,c0936c131a71657afc635d0db2ab096d15d473e1)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[7c37c7e00411b3d1e0c5292368317aca69d1f324,3081702ea5aca0aeed9c1ade8eadf6cde8db6b7d)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[7c37c7e00411b3d1e0c5292368317aca69d1f324,d536bf205c71f700f6de2086038c3e1d77724715)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[7c37c7e00411b3d1e0c5292368317aca69d1f324,18506d7263768d76ac8e057ba55a4d9da50aad66)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[7c37c7e00411b3d1e0c5292368317aca69d1f324,6347c5314cee49f364aaf2e40ff15415a57a116e)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "5.13"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,5.13)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,6.6.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,6.12.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,6.18.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,7.1.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.2-rc5,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-08-05T10:00:03.413679+00:00", "updated": "2026-08-07T04:30:07.590306+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}