{ "schemaVersion": 1, "attribution": [ { "source": "CISA Known Exploited Vulnerabilities", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog", "licence": "US government work" }, { "source": "GitHub Advisory Database", "url": "https://github.com/advisories", "licence": "CC BY 4.0" }, { "source": "Have I Been Pwned", "url": "https://haveibeenpwned.com/", "licence": "CC BY 4.0" }, { "source": "CVE Program (CVE records)", "url": "https://www.cve.org/Legal/TermsOfUse", "licence": "CVE Terms of Use", "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.", "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy." }, { "source": "FIRST EPSS", "url": "https://www.first.org/epss/", "licence": "free to use; FIRST requests attribution" } ], "record": { "id": "CVE-2025-68813", "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2025-68813", "idYear": 2025, "status": "PUBLISHED", "publishedAt": "2026-01-13T15:29:18.483Z", "updatedAt": "2026-10-19T18:05:08.415Z", "importedAt": "2026-10-24T01:57:44.935Z", "snapshot": { "id": "cve_2026-10-24_midnight_baseline", "at": "2026-10-24T00:00:00.000Z", "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z" }, "facts": { "title": "ipvs: fix ipv4 null-ptr-deref in route error path", "summary": "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", "affected": [ { "vendor": "Linux", "product": "Linux", "defaultStatus": "unaffected", "versions": [ { "version": "ed0de45a1008991fdaa27a0152befcb74d126a8b", "status": "affected", "versionType": "git", "lessThan": "dd72a93c80408f06327dd2d956eb1a656d0b5903" }, { "version": "ed0de45a1008991fdaa27a0152befcb74d126a8b", "status": "affected", "versionType": "git", "lessThan": "312d7cd88882fc6cadcc08b02287497aaaf94bcd" }, { "version": "ed0de45a1008991fdaa27a0152befcb74d126a8b", "status": "affected", "versionType": "git", "lessThan": "cdeff10851c37a002d87a035818ebd60fdb74447" }, { "version": "ed0de45a1008991fdaa27a0152befcb74d126a8b", "status": "affected", "versionType": "git", "lessThan": "4729ff0581fbb7ad098b6153b76b6f5aac94618a" }, { "version": "ed0de45a1008991fdaa27a0152befcb74d126a8b", "status": "affected", "versionType": "git", "lessThan": "25ab24df31f7af843c96a38e0781b9165216e1a8" }, { "version": "ed0de45a1008991fdaa27a0152befcb74d126a8b", "status": "affected", "versionType": "git", "lessThan": "689a627d14788ad772e0fa24c2e57a23dbc7ce90" }, { "version": "ed0de45a1008991fdaa27a0152befcb74d126a8b", "status": "affected", "versionType": "git", "lessThan": "ad891bb3d079a46a821bf2b8867854645191bab0" }, { "version": "6c2fa855d8178699706b1192db2f1f8102b0ba1e", "status": "affected", "versionType": "git" }, { "version": "fbf569d2beee2a4a7a0bc8b619c26101d1211a88", "status": "affected", "versionType": "git" }, { "version": "ff71f99d5fb2daf54340e8b290d0bc4e6b4c1d38", "status": "affected", "versionType": "git" }, { "version": "3d988fcddbe7b8673a231958bd2fba61b5a7ced9", "status": "affected", "versionType": "git" }, { "version": "8a430e56a6485267a1b2d3747209d26c54d1a34b", "status": "affected", "versionType": "git" }, { "version": "6bd1ee0a993fc9574ae43c1994c54a60cb23a380", "status": "affected", "versionType": "git" }, { "version": "3.18.139", "status": "affected", "versionType": "semver", "lessThan": "3.19" }, { "version": "4.4.179", "status": "affected", "versionType": "semver", "lessThan": "4.5" }, { "version": "4.9.171", "status": "affected", "versionType": "semver", "lessThan": "4.10" }, { "version": "4.14.114", "status": "affected", "versionType": "semver", "lessThan": "4.15" }, { "version": "4.19.37", "status": "affected", "versionType": "semver", "lessThan": "4.20" }, { "version": "5.0.10", "status": "affected", "versionType": "semver", "lessThan": "5.1" } ] }, { "vendor": "Linux", "product": "Linux", "defaultStatus": "affected", "versions": [ { "version": "5.1", "status": "affected" }, { "version": "0", "status": "unaffected", "versionType": "semver", "lessThan": "5.1" }, { "version": "5.10.248", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.10.*" }, { "version": "5.15.198", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.15.*" }, { "version": "6.1.160", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.1.*" }, { "version": "6.6.120", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.6.*" }, { "version": "6.12.64", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.12.*" }, { "version": "6.18.3", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.18.*" }, { "version": "6.19", "status": "unaffected", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*" } ] } ] } } }