{"id":"CVE-2025-68813","revision":"6b190d8d8ab04b6d8daa654192ade917","records":[{"revision":"6b190d8d8ab04b6d8daa654192ade917","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2025-68813","aliases":[],"title":"ipvs: fix ipv4 null-ptr-deref in route error path","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nipvs: fix ipv4 null-ptr-deref in route error path\n\nThe IPv4 code path in __ip_vs_get_out_rt() calls dst_link_failure()\nwithout ensuring skb->dev is set, leading to a NULL pointer dereference\nin fib_compute_spec_dst() when ipv4_link_failure() attempts to send\nICMP destination unreachable messages.\n\nThe issue emerged after commit ed0de45a1008 (\"ipv4: recompile ip options\nin ipv4_link_failure\") started calling __ip_options_compile() from\nipv4_link_failure(). This code path eventually calls fib_compute_spec_dst()\nwhich dereferences skb->dev. An attempt was made to fix the NULL skb->dev\ndereference in commit 0113d9c9d1cc (\"ipv4: fix null-deref in\nipv4_link_failure\"), but it only addressed the immediate dev_net(skb->dev)\ndereference by using a fallback device. The fix was incomplete because\nfib_compute_spec_dst() later in the call chain still accesses skb->dev\ndirectly, which remains NULL when IPVS calls dst_link_failure().\n\nThe crash occurs when:\n1. IPVS processes a packet in NAT mode with a misconfigured destination\n2. Route lookup fails in __ip_vs_get_out_rt() before establishing a route\n3. The error path calls dst_link_failure(skb) with skb->dev == NULL\n4. ipv4_link_failure() → ipv4_send_dest_unreach() →\n __ip_options_compile() → fib_compute_spec_dst()\n5. fib_compute_spec_dst() dereferences NULL skb->dev\n\nApply the same fix used for IPv6 in commit 326bf17ea5d4 (\"ipvs: fix\nipv6 route unreach panic\"): set skb->dev from skb_dst(skb)->dev before\ncalling dst_link_failure().\n\nKASAN: null-ptr-deref in range [0x0000000000000328-0x000000000000032f]\nCPU: 1 PID: 12732 Comm: syz.1.3469 Not tainted 6.6.114 #2\nRIP: 0010:__in_dev_get_rcu include/linux/inetdevice.h:233\nRIP: 0010:fib_compute_spec_dst+0x17a/0x9f0 net/ipv4/fib_frontend.c:285\nCall Trace:\n \n spec_dst_fill net/ipv4/ip_options.c:232\n spec_dst_fill net/ipv4/ip_options.c:229\n __ip_options_compile+0x13a1/0x17d0 net/ipv4/ip_options.c:330\n ipv4_send_dest_unreach net/ipv4/route.c:1252\n ipv4_link_failure+0x702/0xb80 net/ipv4/route.c:1265\n dst_link_failure include/net/dst.h:437\n __ip_vs_get_out_rt+0x15fd/0x19e0 net/netfilter/ipvs/ip_vs_xmit.c:412\n ip_vs_nat_xmit+0x1d8/0xc80 net/netfilter/ipvs/ip_vs_xmit.c:764","state":0,"publishedAt":"2026-01-13T15:29:18.483+00:00","modifiedAt":"2026-10-19T18:05:08.415+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/ipvs/ip_vs_xmit.c\"\n ],\n \"versions\": [\n {\n \"version\": \"ed0de45a1008991fdaa27a0152befcb74d126a8b\",\n \"lessThan\": \"dd72a93c80408f06327dd2d956eb1a656d0b5903\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"ed0de45a1008991fdaa27a0152befcb74d126a8b\",\n \"lessThan\": \"312d7cd88882fc6cadcc08b02287497aaaf94bcd\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"ed0de45a1008991fdaa27a0152befcb74d126a8b\",\n \"lessThan\": \"cdeff10851c37a002d87a035818ebd60fdb74447\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"ed0de45a1008991fdaa27a0152befcb74d126a8b\",\n \"lessThan\": \"4729ff0581fbb7ad098b6153b76b6f5aac94618a\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"ed0de45a1008991fdaa27a0152befcb74d126a8b\",\n \"lessThan\": \"25ab24df31f7af843c96a38e0781b9165216e1a8\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"ed0de45a1008991fdaa27a0152befcb74d126a8b\",\n \"lessThan\": \"689a627d14788ad772e0fa24c2e57a23dbc7ce90\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"ed0de45a1008991fdaa27a0152befcb74d126a8b\",\n \"lessThan\": \"ad891bb3d079a46a821bf2b8867854645191bab0\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"6c2fa855d8178699706b1192db2f1f8102b0ba1e\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"fbf569d2beee2a4a7a0bc8b619c26101d1211a88\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"ff71f99d5fb2daf54340e8b290d0bc4e6b4c1d38\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"3d988fcddbe7b8673a231958bd2fba61b5a7ced9\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"8a430e56a6485267a1b2d3747209d26c54d1a34b\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"6bd1ee0a993fc9574ae43c1994c54a60cb23a380\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"3.18.139\",\n \"lessThan\": \"3.19\",\n \"status\": \"affected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"4.4.179\",\n \"lessThan\": \"4.5\",\n \"status\": \"affected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"4.9.171\",\n \"lessThan\": \"4.10\",\n \"status\": \"affected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"4.14.114\",\n \"lessThan\": \"4.15\",\n \"status\": \"affected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"4.19.37\",\n \"lessThan\": \"4.20\",\n \"status\": \"affected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.0.10\",\n \"lessThan\": \"5.1\",\n \"status\": \"affected\",\n \"versionType\": \"semver\"\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/ipvs/ip_vs_xmit.c\"\n ],\n \"versions\": [\n {\n \"version\": \"5.1\",\n \"status\": \"affected\"\n },\n {\n \"version\": \"0\",\n \"lessThan\": \"5.1\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.10.248\",\n \"lessThanOrEqual\": \"5.10.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.15.198\",\n \"lessThanOrEqual\": \"5.15.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.1.160\",\n \"lessThanOrEqual\": \"6.1.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.6.120\",\n \"lessThanOrEqual\": \"6.6.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.12.64\",\n \"lessThanOrEqual\": \"6.12.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.18.3\",\n \"lessThanOrEqual\": \"6.18.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.19\",\n \"lessThanOrEqual\": \"*\",\n \"status\": \"unaffected\",\n \"versionType\": \"original_commit_for_fix\"\n }\n ]\n }"}],"metrics":[],"references":["https://git.kernel.org/stable/c/dd72a93c80408f06327dd2d956eb1a656d0b5903","https://git.kernel.org/stable/c/312d7cd88882fc6cadcc08b02287497aaaf94bcd","https://git.kernel.org/stable/c/cdeff10851c37a002d87a035818ebd60fdb74447","https://git.kernel.org/stable/c/4729ff0581fbb7ad098b6153b76b6f5aac94618a","https://git.kernel.org/stable/c/25ab24df31f7af843c96a38e0781b9165216e1a8","https://git.kernel.org/stable/c/689a627d14788ad772e0fa24c2e57a23dbc7ce90","https://git.kernel.org/stable/c/ad891bb3d079a46a821bf2b8867854645191bab0"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2025-68813","license":"CVE Program Terms of Use","key":"cve-program:CVE-2025-68813","identifiers":["CVE-2025-68813"]},"retained":false,"historicalAffected":[]}],"coverage":[]}