https://db.gcve.eu Contains only the most 10 recent entries. http://www.rssboard.org/rss-specification python-feedgen en Thu, 01 Oct 2026 20:48:22 +0000 https://db.gcve.eu/vuln/cve-2026-52998 <p><strong>Affected:</strong> Linux, Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP, Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP, Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP</p> <p>In the Linux kernel, the following vulnerability has been resolved:</p> <p>netfilter: nfnetlink_osf: fix potential NULL dereference in ttl check</p> <p>The nf_osf_ttl() function accessed skb-&gt;dev to perform a local interface address lookup without verifying that the device pointer was valid.</p> <p>Additionally, the implementation utilized an in_dev_for_each_ifa_rcu loop to match the packet source address against local interface addresses. It assumed that packets from the same subnet should not see a decrement on the initial TTL. A packet might appear it is from the same subnet but it actually isn&#39;t especially in modern environments with containers and virtual switching.</p> <p>Remove the device dereference and interface loop. Replace the logic with a switch statement that evaluates the TTL according to the ttl_check.</p> <p><strong>Affected:</strong> Linux, Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP, Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP, Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP</p> <p>In the Linux kernel, the following vulnerability has been resolved:</p> <p>netfilter: nfnetlink_osf: fix potential NULL dereference in ttl check</p> <p>The nf_osf_ttl() function accessed skb-&gt;dev to perform a local interface address lookup without verifying that the device pointer was valid.</p> <p>Additionally, the implementation utilized an in_dev_for_each_ifa_rcu loop to match the packet source address against local interface addresses. It assumed that packets from the same subnet should not see a decrement on the initial TTL. A packet might appear it is from the same subnet but it actually isn&#39;t especially in modern environments with containers and virtual switching.</p> <p>Remove the device dereference and interface loop. Replace the logic with a switch statement that evaluates the TTL according to the ttl_check.</p> https://db.gcve.eu/vuln/cve-2026-52998