{"id":"CVE-2026-52998","revision":"9c54a9eb24524efbbbaf27d304bd82f6","records":[{"revision":"9c54a9eb24524efbbbaf27d304bd82f6","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-52998","aliases":[],"title":"netfilter: nfnetlink_osf: fix potential NULL dereference in ttl check","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nfnetlink_osf: fix potential NULL dereference in ttl check\n\nThe nf_osf_ttl() function accessed skb->dev to perform a local interface\naddress lookup without verifying that the device pointer was valid.\n\nAdditionally, the implementation utilized an in_dev_for_each_ifa_rcu\nloop to match the packet source address against local interface\naddresses. It assumed that packets from the same subnet should not see a\ndecrement on the initial TTL. A packet might appear it is from the same\nsubnet but it actually isn't especially in modern environments with\ncontainers and virtual switching.\n\nRemove the device dereference and interface loop. Replace the logic with\na switch statement that evaluates the TTL according to the ttl_check.","state":0,"publishedAt":"2026-06-24T16:29:10.874+00:00","modifiedAt":"2026-10-19T19:47:12.693+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"net/netfilter/nfnetlink_osf.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384\",\n                            \"lessThan\": \"f4de0777e4554a7de19c920accde6319dd530782\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384\",\n                            \"lessThan\": \"c996a90f3071cf43683e5423da31aadbe002b8b4\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384\",\n                            \"lessThan\": \"edc806f9122961f0d3819f7c69c14cccde31f277\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384\",\n                            \"lessThan\": \"5d05de2f0928d81309a815ecc76d1a3ad72cbc16\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384\",\n                            \"lessThan\": \"95be653a76793856ff8b2d8bd82c2943c23f5ca8\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384\",\n                            \"lessThan\": \"79b90a96688e521771fa6ed3dc7864b76b8df293\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384\",\n                            \"lessThan\": \"83fc5dd63455a779ea2dd0f7ffee3c920919d80b\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384\",\n                            \"lessThan\": \"711987ba281fd806322a7cd244e98e2a81903114\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"net/netfilter/nfnetlink_osf.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"2.6.31\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"2.6.31\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.10.258\",\n                            \"lessThanOrEqual\": \"5.10.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.15.209\",\n                            \"lessThanOrEqual\": \"5.15.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.175\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.141\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.91\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.33\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.0.10\",\n                            \"lessThanOrEqual\": \"7.0.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.1\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/f4de0777e4554a7de19c920accde6319dd530782","https://git.kernel.org/stable/c/c996a90f3071cf43683e5423da31aadbe002b8b4","https://git.kernel.org/stable/c/edc806f9122961f0d3819f7c69c14cccde31f277","https://git.kernel.org/stable/c/5d05de2f0928d81309a815ecc76d1a3ad72cbc16","https://git.kernel.org/stable/c/95be653a76793856ff8b2d8bd82c2943c23f5ca8","https://git.kernel.org/stable/c/79b90a96688e521771fa6ed3dc7864b76b8df293","https://git.kernel.org/stable/c/83fc5dd63455a779ea2dd0f7ffee3c920919d80b","https://git.kernel.org/stable/c/711987ba281fd806322a7cd244e98e2a81903114"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-52998","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-52998","identifiers":["CVE-2026-52998"]},"retained":false,"historicalAffected":[]}],"coverage":[]}