{"cve":"CVE-2026-52998","nvd":{"published":"2026-06-24T17:17:10.777","modified":"2026-10-19T20:18:54.130","status":"Modified","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.","cvss_v4":null,"cvss_v3":{"version":"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},"cwes":["CWE-476"],"references":["https://git.kernel.org/stable/c/5d05de2f0928d81309a815ecc76d1a3ad72cbc16","https://git.kernel.org/stable/c/711987ba281fd806322a7cd244e98e2a81903114","https://git.kernel.org/stable/c/79b90a96688e521771fa6ed3dc7864b76b8df293","https://git.kernel.org/stable/c/83fc5dd63455a779ea2dd0f7ffee3c920919d80b","https://git.kernel.org/stable/c/95be653a76793856ff8b2d8bd82c2943c23f5ca8"],"products":["linux:linux_kernel"],"source":"nvd","synced_at":"2026-10-21T03:43:09.190223697+00:00"},"epss":{"cve":"CVE-2026-52998","score":0.00579,"percentile":0.47362,"date":"2026-10-25"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}