{ "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-2023-52577", "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2023-52577", "idYear": 2023, "status": "PUBLISHED", "publishedAt": "2024-03-02T21:59:45.279Z", "updatedAt": "2026-05-23T15:26:23.897Z", "importedAt": "2026-10-24T01:57:03.413Z", "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": "dccp: fix dccp_v4_err()/dccp_v6_err() again", "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\ndccp: fix dccp_v4_err()/dccp_v6_err() again\n\ndh->dccph_x is the 9th byte (offset 8) in \"struct dccp_hdr\",\nnot in the \"byte 7\" as Jann claimed.\n\nWe need to make sure the ICMP messages are big enough,\nusing more standard ways (no more assumptions).\n\nsyzbot reported:\nBUG: KMSAN: uninit-value in pskb_may_pull_reason include/linux/skbuff.h:2667 [inline]\nBUG: KMSAN: uninit-value in pskb_may_pull include/linux/skbuff.h:2681 [inline]\nBUG: KMSAN: uninit-value in dccp_v6_err+0x426/0x1aa0 net/dccp/ipv6.c:94\npskb_may_pull_reason include/linux/skbuff.h:2667 [inline]\npskb_may_pull include/linux/skbuff.h:2681 [inline]\ndccp_v6_err+0x426/0x1aa0 net/dccp/ipv6.c:94\nicmpv6_notify+0x4c7/0x880 net/ipv6/icmp.c:867\nicmpv6_rcv+0x19d5/0x30d0\nip6_protocol_deliver_rcu+0xda6/0x2a60 net/ipv6/ip6_input.c:438\nip6_input_finish net/ipv6/ip6_input.c:483 [inline]\nNF_HOOK include/linux/netfilter.h:304 [inline]\nip6_input+0x15d/0x430 net/ipv6/ip6_input.c:492\nip6_mc_input+0xa7e/0xc80 net/ipv6/ip6_input.c:586\ndst_input include/net/dst.h:468 [inline]\nip6_rcv_finish+0x5db/0x870 net/ipv6/ip6_input.c:79\nNF_HOOK include/linux/netfilter.h:304 [inline]\nipv6_rcv+0xda/0x390 net/ipv6/ip6_input.c:310\n__netif_receive_skb_one_core net/core/dev.c:5523 [inline]\n__netif_receive_skb+0x1a6/0x5a0 net/core/dev.c:5637\nnetif_receive_skb_internal net/core/dev.c:5723 [inline]\nnetif_receive_skb+0x58/0x660 net/core/dev.c:5782\ntun_rx_batched+0x83b/0x920\ntun_get_user+0x564c/0x6940 drivers/net/tun.c:2002\ntun_chr_write_iter+0x3af/0x5d0 drivers/net/tun.c:2048\ncall_write_iter include/linux/fs.h:1985 [inline]\nnew_sync_write fs/read_write.c:491 [inline]\nvfs_write+0x8ef/0x15c0 fs/read_write.c:584\nksys_write+0x20f/0x4c0 fs/read_write.c:637\n__do_sys_write fs/read_write.c:649 [inline]\n__se_sys_write fs/read_write.c:646 [inline]\n__x64_sys_write+0x93/0xd0 fs/read_write.c:646\ndo_syscall_x64 arch/x86/entry/common.c:50 [inline]\ndo_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80\nentry_SYSCALL_64_after_hwframe+0x63/0xcd\n\nUninit was created at:\nslab_post_alloc_hook+0x12f/0xb70 mm/slab.h:767\nslab_alloc_node mm/slub.c:3478 [inline]\nkmem_cache_alloc_node+0x577/0xa80 mm/slub.c:3523\nkmalloc_reserve+0x13d/0x4a0 net/core/skbuff.c:559\n__alloc_skb+0x318/0x740 net/core/skbuff.c:650\nalloc_skb include/linux/skbuff.h:1286 [inline]\nalloc_skb_with_frags+0xc8/0xbd0 net/core/skbuff.c:6313\nsock_alloc_send_pskb+0xa80/0xbf0 net/core/sock.c:2795\ntun_alloc_skb drivers/net/tun.c:1531 [inline]\ntun_get_user+0x23cf/0x6940 drivers/net/tun.c:1846\ntun_chr_write_iter+0x3af/0x5d0 drivers/net/tun.c:2048\ncall_write_iter include/linux/fs.h:1985 [inline]\nnew_sync_write fs/read_write.c:491 [inline]\nvfs_write+0x8ef/0x15c0 fs/read_write.c:584\nksys_write+0x20f/0x4c0 fs/read_write.c:637\n__do_sys_write fs/read_write.c:649 [inline]\n__se_sys_write fs/read_write.c:646 [inline]\n__x64_sys_write+0x93/0xd0 fs/read_write.c:646\ndo_syscall_x64 arch/x86/entry/common.c:50 [inline]\ndo_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80\nentry_SYSCALL_64_after_hwframe+0x63/0xcd\n\nCPU: 0 PID: 4995 Comm: syz-executor153 Not tainted 6.6.0-rc1-syzkaller-00014-ga747acc0b752 #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/04/2023", "affected": [ { "vendor": "Linux", "product": "Linux", "defaultStatus": "unaffected", "versions": [ { "version": "3533e10272555c422a7d51ebc0ce8c483429f7f2", "status": "affected", "versionType": "git", "lessThan": "4600beae416d754a3cedbb1ecea8181ec05073b6" }, { "version": "177212bf6dc1ff2d13d0409cddc5c9e81feec63d", "status": "affected", "versionType": "git", "lessThan": "62c218124fe58372e0e1f60d5b634d21c264b337" }, { "version": "7a7dd70cb954d3efa706a429687ded88c02496fa", "status": "affected", "versionType": "git", "lessThan": "a6f4d582e25d512c9b492670b6608436694357b3" }, { "version": "4b8a938e329ae4eb54b73b0c87b5170607b038a8", "status": "affected", "versionType": "git", "lessThan": "60d73c62e3e4464f375758b6f2459c13d46465b6" }, { "version": "6ecf09699eb1554299aa1e7fd13e9e80f656c2f9", "status": "affected", "versionType": "git", "lessThan": "26df9ab5de308caa1503d937533c56c35793018d" }, { "version": "f8a7f10a1dccf9868ff09342a73dce27501b86df", "status": "affected", "versionType": "git", "lessThan": "73be49248a04746096339a48a33fa2f03bd85969" }, { "version": "ec620c34f5fa5d055f9f6136a387755db6157712", "status": "affected", "versionType": "git", "lessThan": "1512d8f45d3c5d0b5baa00bd8e600492fa569f40" }, { "version": "977ad86c2a1bcaf58f01ab98df5cc145083c489c", "status": "affected", "versionType": "git", "lessThan": "6af289746a636f71f4c0535a9801774118486c7a" }, { "version": "d8171411a661253e6271fa10b65b46daf1b6471c", "status": "affected", "versionType": "git" }, { "version": "6.4.16", "status": "affected", "versionType": "semver", "lessThan": "6.5" } ] }, { "vendor": "Linux", "product": "Linux", "defaultStatus": "unaffected", "versions": [ { "version": "4.14.326", "status": "affected", "versionType": "semver", "lessThan": "4.14.327" }, { "version": "4.19.295", "status": "affected", "versionType": "semver", "lessThan": "4.19.296" }, { "version": "5.4.257", "status": "affected", "versionType": "semver", "lessThan": "5.4.258" }, { "version": "5.10.195", "status": "affected", "versionType": "semver", "lessThan": "5.10.198" }, { "version": "5.15.132", "status": "affected", "versionType": "semver", "lessThan": "5.15.134" }, { "version": "6.1.53", "status": "affected", "versionType": "semver", "lessThan": "6.1.56" }, { "version": "6.5.3", "status": "affected", "versionType": "semver", "lessThan": "6.5.6" } ] } ] } } }