{"id":"CVE-2026-64002","state":"PUBLISHED","title":"ipv4: free net->ipv4.sysctl_local_reserved_ports after unregister_net_sysctl_table()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nipv4: free net->ipv4.sysctl_local_reserved_ports after unregister_net_sysctl_table()\n\nipv4_sysctl_exit_net() is currently freeing net->ipv4.sysctl_local_reserved_ports\ntoo soon.\n\nOnly after unregister_net_sysctl_table() we can be sure no threads can possibly\nuse the sysctls, including /proc/sys/net/ipv4/ip_local_reserved_ports.","publishedAt":"2026-07-19T14:56:19.495Z","updatedAt":"2026-10-19T20:18:02.288Z","severity":{"score":7.8,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","source":"Linux"},"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"122ff243f5f104194750ecbc76d5946dd1eec934","status":"affected","lessThan":"ecf45080a4d3f4526cacb8b14060fe3b49a6913b","versionType":"git"},{"version":"122ff243f5f104194750ecbc76d5946dd1eec934","status":"affected","lessThan":"a0ffc6081a8b27082dd5eae5aa1e3f59bbecf06c","versionType":"git"},{"version":"122ff243f5f104194750ecbc76d5946dd1eec934","status":"affected","lessThan":"5b23a2ff379e70b6b9ff744a972b63e1f8f4d996","versionType":"git"},{"version":"122ff243f5f104194750ecbc76d5946dd1eec934","status":"affected","lessThan":"8e59d4d0dcde2dfb07a7ef855c849a2a0560aa57","versionType":"git"},{"version":"122ff243f5f104194750ecbc76d5946dd1eec934","status":"affected","lessThan":"6512c57c4638ddec113bf42439361ba85a12048d","versionType":"git"},{"version":"122ff243f5f104194750ecbc76d5946dd1eec934","status":"affected","lessThan":"a7f4eefb6e1458431eef9fa20fb363320d185f76","versionType":"git"},{"version":"122ff243f5f104194750ecbc76d5946dd1eec934","status":"affected","lessThan":"155f90be5ee8be5b110ebc0b7da33c54c83b0208","versionType":"git"},{"version":"122ff243f5f104194750ecbc76d5946dd1eec934","status":"affected","lessThan":"87a1e0fe7776da7ab411be332b4be58ac8840d10","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/ipv4/sysctl_net_ipv4.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"3.16","status":"affected"},{"version":"0","status":"unaffected","lessThan":"3.16","versionType":"semver"},{"version":"5.10.259","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.210","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.176","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.143","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.93","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.35","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.0.12","status":"unaffected","lessThanOrEqual":"7.0.*","versionType":"semver"},{"version":"7.1","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/ipv4/sysctl_net_ipv4.c"]}],"references":["https://git.kernel.org/stable/c/ecf45080a4d3f4526cacb8b14060fe3b49a6913b","https://git.kernel.org/stable/c/a0ffc6081a8b27082dd5eae5aa1e3f59bbecf06c","https://git.kernel.org/stable/c/5b23a2ff379e70b6b9ff744a972b63e1f8f4d996","https://git.kernel.org/stable/c/8e59d4d0dcde2dfb07a7ef855c849a2a0560aa57","https://git.kernel.org/stable/c/6512c57c4638ddec113bf42439361ba85a12048d","https://git.kernel.org/stable/c/a7f4eefb6e1458431eef9fa20fb363320d185f76","https://git.kernel.org/stable/c/155f90be5ee8be5b110ebc0b7da33c54c83b0208","https://git.kernel.org/stable/c/87a1e0fe7776da7ab411be332b4be58ac8840d10"],"weaknesses":["CWE-416"],"ingestedAt":"2026-10-29T20:12:41.951Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/64xxx/CVE-2026-64002.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-64002","state":"PUBLISHED","datePublished":"2026-07-19T14:56:19.495Z","dateUpdated":"2026-10-19T20:18:02.288Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-07-19T07:54:57.026Z"},"containers":{"cna":{"title":"ipv4: free net->ipv4.sysctl_local_reserved_ports after unregister_net_sysctl_table()","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nipv4: free net->ipv4.sysctl_local_reserved_ports after unregister_net_sysctl_table()\n\nipv4_sysctl_exit_net() is currently freeing net->ipv4.sysctl_local_reserved_ports\ntoo soon.\n\nOnly after unregister_net_sysctl_table() we can be sure no threads can possibly\nuse the sysctls, including /proc/sys/net/ipv4/ip_local_reserved_ports."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"122ff243f5f104194750ecbc76d5946dd1eec934","status":"affected","lessThan":"ecf45080a4d3f4526cacb8b14060fe3b49a6913b","versionType":"git"},{"version":"122ff243f5f104194750ecbc76d5946dd1eec934","status":"affected","lessThan":"a0ffc6081a8b27082dd5eae5aa1e3f59bbecf06c","versionType":"git"},{"version":"122ff243f5f104194750ecbc76d5946dd1eec934","status":"affected","lessThan":"5b23a2ff379e70b6b9ff744a972b63e1f8f4d996","versionType":"git"},{"version":"122ff243f5f104194750ecbc76d5946dd1eec934","status":"affected","lessThan":"8e59d4d0dcde2dfb07a7ef855c849a2a0560aa57","versionType":"git"},{"version":"122ff243f5f104194750ecbc76d5946dd1eec934","status":"affected","lessThan":"6512c57c4638ddec113bf42439361ba85a12048d","versionType":"git"},{"version":"122ff243f5f104194750ecbc76d5946dd1eec934","status":"affected","lessThan":"a7f4eefb6e1458431eef9fa20fb363320d185f76","versionType":"git"},{"version":"122ff243f5f104194750ecbc76d5946dd1eec934","status":"affected","lessThan":"155f90be5ee8be5b110ebc0b7da33c54c83b0208","versionType":"git"},{"version":"122ff243f5f104194750ecbc76d5946dd1eec934","status":"affected","lessThan":"87a1e0fe7776da7ab411be332b4be58ac8840d10","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/ipv4/sysctl_net_ipv4.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"3.16","status":"affected"},{"version":"0","status":"unaffected","lessThan":"3.16","versionType":"semver"},{"version":"5.10.259","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.210","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.176","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.143","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.93","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.35","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.0.12","status":"unaffected","lessThanOrEqual":"7.0.*","versionType":"semver"},{"version":"7.1","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/ipv4/sysctl_net_ipv4.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/ecf45080a4d3f4526cacb8b14060fe3b49a6913b"},{"url":"https://git.kernel.org/stable/c/a0ffc6081a8b27082dd5eae5aa1e3f59bbecf06c"},{"url":"https://git.kernel.org/stable/c/5b23a2ff379e70b6b9ff744a972b63e1f8f4d996"},{"url":"https://git.kernel.org/stable/c/8e59d4d0dcde2dfb07a7ef855c849a2a0560aa57"},{"url":"https://git.kernel.org/stable/c/6512c57c4638ddec113bf42439361ba85a12048d"},{"url":"https://git.kernel.org/stable/c/a7f4eefb6e1458431eef9fa20fb363320d185f76"},{"url":"https://git.kernel.org/stable/c/155f90be5ee8be5b110ebc0b7da33c54c83b0208"},{"url":"https://git.kernel.org/stable/c/87a1e0fe7776da7ab411be332b4be58ac8840d10"}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH"},"scenarios":[{"lang":"en","value":"AV:L - Exploitation requires local syscalls—network namespace teardown via unshare/setns/put_net, sysctl access to /proc/sys/net/ipv4/ip_local_reserved_ports, and/or local socket bind/connect—not remote packet delivery.\nAC:L - The attacker can control both sides of the race by concurrently tearing down a network namespace while hammering the sysctl or triggering socket port selection in that namespace.\nPR:L - An unprivileged local user can reach this via user namespaces (CAP_SYS_ADMIN within the user_ns for CLONE_NEWNET) and world-writable sysctl access (mode 0644) during namespace destruction.\nUI:N - No victim interaction is required beyond the attacker's own concurrent namespace teardown and sysctl or socket activity.\nS:U - The UAF corrupts kernel heap memory within the same kernel security domain; it is standard local kernel memory corruption, not a VM/hypervisor boundary escape.\nC:H - Freed 8 KiB bitmap memory remains reachable via sysctl reads (find_next_bit) and inet_is_local_reserved_port() (test_bit), enabling heap information disclosure through a use-after-free.\nI:H - Sysctl writes via proc_do_large_bitmap perform bitmap_copy/bitmap_or into the freed allocation, providing a heap write primitive exploitable for control-flow hijacking.\nA:H - Concurrent access to the freed bitmap can cause kernel oops/panic from invalid memory access, and UAF exploitation inherently threatens kernel availability."}]}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-08-05T12:38:02.672Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.16","versionEndExcluding":"5.10.259"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.16","versionEndExcluding":"5.15.210"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.16","versionEndExcluding":"6.1.176"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.16","versionEndExcluding":"6.6.143"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.16","versionEndExcluding":"6.12.93"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.16","versionEndExcluding":"6.18.35"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.16","versionEndExcluding":"7.0.12"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.16","versionEndExcluding":"7.1"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"id":"CVE-2026-64002","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"version":"2.0.3","timestamp":"2026-10-16T15:35:00.962668Z"}}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-416","lang":"en","type":"CWE","description":"CWE-416 Use After Free"}]}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-10-19T20:18:02.288Z"}}]}}}