{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-64002", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-07-19T07:54:57.026Z", "datePublished": "2026-07-19T14:56:19.495Z", "dateUpdated": "2026-08-05T12:38:02.672Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:38:02.672Z" }, "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." } ], "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." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/ipv4/sysctl_net_ipv4.c" ], "versions": [ { "version": "122ff243f5f104194750ecbc76d5946dd1eec934", "lessThan": "ecf45080a4d3f4526cacb8b14060fe3b49a6913b", "status": "affected", "versionType": "git" }, { "version": "122ff243f5f104194750ecbc76d5946dd1eec934", "lessThan": "a0ffc6081a8b27082dd5eae5aa1e3f59bbecf06c", "status": "affected", "versionType": "git" }, { "version": "122ff243f5f104194750ecbc76d5946dd1eec934", "lessThan": "5b23a2ff379e70b6b9ff744a972b63e1f8f4d996", "status": "affected", "versionType": "git" }, { "version": "122ff243f5f104194750ecbc76d5946dd1eec934", "lessThan": "8e59d4d0dcde2dfb07a7ef855c849a2a0560aa57", "status": "affected", "versionType": "git" }, { "version": "122ff243f5f104194750ecbc76d5946dd1eec934", "lessThan": "6512c57c4638ddec113bf42439361ba85a12048d", "status": "affected", "versionType": "git" }, { "version": "122ff243f5f104194750ecbc76d5946dd1eec934", "lessThan": "a7f4eefb6e1458431eef9fa20fb363320d185f76", "status": "affected", "versionType": "git" }, { "version": "122ff243f5f104194750ecbc76d5946dd1eec934", "lessThan": "155f90be5ee8be5b110ebc0b7da33c54c83b0208", "status": "affected", "versionType": "git" }, { "version": "122ff243f5f104194750ecbc76d5946dd1eec934", "lessThan": "87a1e0fe7776da7ab411be332b4be58ac8840d10", "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/sysctl_net_ipv4.c" ], "versions": [ { "version": "3.16", "status": "affected" }, { "version": "0", "lessThan": "3.16", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.259", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.210", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.176", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.143", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.93", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.35", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.0.12", "lessThanOrEqual": "7.0.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1", "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": "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" } ] } ] } ], "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" } ], "title": "ipv4: free net->ipv4.sysctl_local_reserved_ports after unregister_net_sysctl_table()", "x_generator": { "engine": "bippy-1.2.0" } } } }