{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2024-50033", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-10-21T12:17:06.069Z", "datePublished": "2024-10-21T19:39:35.127Z", "dateUpdated": "2026-08-05T11:41:08.646Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:41:08.646Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nslip: make slhc_remember() more robust against malicious packets\n\nsyzbot found that slhc_remember() was missing checks against\nmalicious packets [1].\n\nslhc_remember() only checked the size of the packet was at least 20,\nwhich is not good enough.\n\nWe need to make sure the packet includes the IPv4 and TCP header\nthat are supposed to be carried.\n\nAdd iph and th pointers to make the code more readable.\n\n[1]\n\nBUG: KMSAN: uninit-value in slhc_remember+0x2e8/0x7b0 drivers/net/slip/slhc.c:666\n slhc_remember+0x2e8/0x7b0 drivers/net/slip/slhc.c:666\n ppp_receive_nonmp_frame+0xe45/0x35e0 drivers/net/ppp/ppp_generic.c:2455\n ppp_receive_frame drivers/net/ppp/ppp_generic.c:2372 [inline]\n ppp_do_recv+0x65f/0x40d0 drivers/net/ppp/ppp_generic.c:2212\n ppp_input+0x7dc/0xe60 drivers/net/ppp/ppp_generic.c:2327\n pppoe_rcv_core+0x1d3/0x720 drivers/net/ppp/pppoe.c:379\n sk_backlog_rcv+0x13b/0x420 include/net/sock.h:1113\n __release_sock+0x1da/0x330 net/core/sock.c:3072\n release_sock+0x6b/0x250 net/core/sock.c:3626\n pppoe_sendmsg+0x2b8/0xb90 drivers/net/ppp/pppoe.c:903\n sock_sendmsg_nosec net/socket.c:729 [inline]\n __sock_sendmsg+0x30f/0x380 net/socket.c:744\n ____sys_sendmsg+0x903/0xb60 net/socket.c:2602\n ___sys_sendmsg+0x28d/0x3c0 net/socket.c:2656\n __sys_sendmmsg+0x3c1/0x960 net/socket.c:2742\n __do_sys_sendmmsg net/socket.c:2771 [inline]\n __se_sys_sendmmsg net/socket.c:2768 [inline]\n __x64_sys_sendmmsg+0xbc/0x120 net/socket.c:2768\n x64_sys_call+0xb6e/0x3ba0 arch/x86/include/generated/asm/syscalls_64.h:308\n do_syscall_x64 arch/x86/entry/common.c:52 [inline]\n do_syscall_64+0xcd/0x1e0 arch/x86/entry/common.c:83\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\n\nUninit was created at:\n slab_post_alloc_hook mm/slub.c:4091 [inline]\n slab_alloc_node mm/slub.c:4134 [inline]\n kmem_cache_alloc_node_noprof+0x6bf/0xb80 mm/slub.c:4186\n kmalloc_reserve+0x13d/0x4a0 net/core/skbuff.c:587\n __alloc_skb+0x363/0x7b0 net/core/skbuff.c:678\n alloc_skb include/linux/skbuff.h:1322 [inline]\n sock_wmalloc+0xfe/0x1a0 net/core/sock.c:2732\n pppoe_sendmsg+0x3a7/0xb90 drivers/net/ppp/pppoe.c:867\n sock_sendmsg_nosec net/socket.c:729 [inline]\n __sock_sendmsg+0x30f/0x380 net/socket.c:744\n ____sys_sendmsg+0x903/0xb60 net/socket.c:2602\n ___sys_sendmsg+0x28d/0x3c0 net/socket.c:2656\n __sys_sendmmsg+0x3c1/0x960 net/socket.c:2742\n __do_sys_sendmmsg net/socket.c:2771 [inline]\n __se_sys_sendmmsg net/socket.c:2768 [inline]\n __x64_sys_sendmmsg+0xbc/0x120 net/socket.c:2768\n x64_sys_call+0xb6e/0x3ba0 arch/x86/include/generated/asm/syscalls_64.h:308\n do_syscall_x64 arch/x86/entry/common.c:52 [inline]\n do_syscall_64+0xcd/0x1e0 arch/x86/entry/common.c:83\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\n\nCPU: 0 UID: 0 PID: 5460 Comm: syz.2.33 Not tainted 6.12.0-rc2-syzkaller-00006-g87d6aab2389e #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024" } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 9.8, "baseSeverity": "CRITICAL" }, "scenarios": [ { "lang": "en", "value": "AV:N - slhc_remember() is driven directly by received PPP frames via ppp_receive_nonmp_frame(), and ppp_input() is entered from pptp.c (PPP over GRE) and l2tp_ppp.c (PPP over L2TP/UDP), both of which are routable across the Internet, as well as PPPoE on the local segment. A remote PPP peer or an attacker injecting into an established PPTP/L2TP session delivers the malformed VJ-uncompressed frame with no local access.\nAC:L - The attacker fully controls the frame; setting ihl=15 with a 60-byte body makes the ip_fast_csum() gate trivially satisfiable since all checksummed bytes are attacker-supplied, and the OOB read succeeds deterministically regardless of heap contents. No race, no memory-layout precondition, and VJ compression is enabled by default in pppd.\nPR:N - The remote PPP peer needs no privileges or credentials on the target host — a rogue PPPoE access concentrator or PPTP/L2TP server is the peer by definition, and PPTP-GRE demultiplexing authenticates nothing beyond source address and call ID. Even the local syzbot path only requires ns_capable(CAP_NET_ADMIN), reachable by any unprivileged user via unshare -Urn.\nUI:N - Exploitation happens entirely through frames received on an already-established PPP link, which is normal operational state. No action by any user or administrator is needed at exploit time.\nS:U - The out-of-bounds access and its consequences are confined to the kernel's own memory and network stack, with no crossing into a different security authority such as a hypervisor or IOMMU boundary.\nC:H - Up to 60 bytes of uninitialized/stale kernel heap are read past the packet into cs_tcp and cs_tcpopt, and a follow-up VJ-compressed frame makes slhc_uncompress() rebuild that data into a well-formed IP packet with an attacker-chosen destination address, exfiltrating kernel memory to the attacker. The primitive is repeatable without limit, giving broad heap disclosure rather than a bounded few-byte leak.\nI:H - Uninitialized memory becomes cs_tcp.doff, which together with cs_ip.ihl drives hdrlen up to 120 in slhc_uncompress(); sl_bump() only reserves 80 bytes before that call, so the resulting memmove/memcpy writes past the kmalloc'd sl->rbuff, giving heap corruption. The corrupted decompression state also causes the kernel to inject attacker-shaped packets carrying heap contents into the local network stack.\nA:H - The out-of-bounds read plus the resulting oversized hdrlen leads to heap overwrite past sl->rbuff on the SLIP path and to malformed reconstructed packets, and on hardened or KASAN/KMSAN-instrumented kernels the access itself triggers an immediate report and panic. The condition is remotely and repeatedly triggerable, so a persistent crash is achievable." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/net/slip/slhc.c" ], "versions": [ { "version": "b5451d783ade99308dfccdf5ca284ed07affa4ff", "lessThan": "ba6501ea06462d6404d57d5644cf2854db38e7d7", "status": "affected", "versionType": "git" }, { "version": "b5451d783ade99308dfccdf5ca284ed07affa4ff", "lessThan": "36b054324d18e51cf466134e13b6fbe3c91f52af", "status": "affected", "versionType": "git" }, { "version": "b5451d783ade99308dfccdf5ca284ed07affa4ff", "lessThan": "5e336384cc9b608e0551f99c3d87316ca3b0e51a", "status": "affected", "versionType": "git" }, { "version": "b5451d783ade99308dfccdf5ca284ed07affa4ff", "lessThan": "ff5e0f895315706e4ca5a19df15be6866cee4f5d", "status": "affected", "versionType": "git" }, { "version": "b5451d783ade99308dfccdf5ca284ed07affa4ff", "lessThan": "8bb79eb1db85a10865f0d4dd15b013def3f2d246", "status": "affected", "versionType": "git" }, { "version": "b5451d783ade99308dfccdf5ca284ed07affa4ff", "lessThan": "29e8d96d44f51cf89a62dd042be35d052833b95c", "status": "affected", "versionType": "git" }, { "version": "b5451d783ade99308dfccdf5ca284ed07affa4ff", "lessThan": "7d3fce8cbe3a70a1c7c06c9b53696be5d5d8dd5c", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/net/slip/slhc.c" ], "versions": [ { "version": "3.2", "status": "affected" }, { "version": "0", "lessThan": "3.2", "status": "unaffected", "versionType": "semver" }, { "version": "5.4.285", "lessThanOrEqual": "5.4.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.227", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.168", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.113", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.57", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.11.4", "lessThanOrEqual": "6.11.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.2", "versionEndExcluding": "5.4.285" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.2", "versionEndExcluding": "5.10.227" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.2", "versionEndExcluding": "5.15.168" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.2", "versionEndExcluding": "6.1.113" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.2", "versionEndExcluding": "6.6.57" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.2", "versionEndExcluding": "6.11.4" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.2", "versionEndExcluding": "6.12" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/ba6501ea06462d6404d57d5644cf2854db38e7d7" }, { "url": "https://git.kernel.org/stable/c/36b054324d18e51cf466134e13b6fbe3c91f52af" }, { "url": "https://git.kernel.org/stable/c/5e336384cc9b608e0551f99c3d87316ca3b0e51a" }, { "url": "https://git.kernel.org/stable/c/ff5e0f895315706e4ca5a19df15be6866cee4f5d" }, { "url": "https://git.kernel.org/stable/c/8bb79eb1db85a10865f0d4dd15b013def3f2d246" }, { "url": "https://git.kernel.org/stable/c/29e8d96d44f51cf89a62dd042be35d052833b95c" }, { "url": "https://git.kernel.org/stable/c/7d3fce8cbe3a70a1c7c06c9b53696be5d5d8dd5c" } ], "title": "slip: make slhc_remember() more robust against malicious packets", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "metrics": [ { "other": { "type": "ssvc", "content": { "id": "CVE-2024-50033", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "partial" } ], "version": "2.0.3", "timestamp": "2024-10-22T13:25:49.586727Z" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-10-22T13:28:45.501Z" } }, { "title": "CVE Program Container", "references": [ { "url": "https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html" }, { "url": "https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html" } ], "providerMetadata": { "orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2025-11-03T22:24:39.473Z" } }, { "x_adpType": "supplier", "providerMetadata": { "orgId": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "shortName": "siemens-SADP", "dateUpdated": "2026-05-12T11:59:49.341Z" }, "affected": [ { "vendor": "Siemens", "product": "RUGGEDCOM RST2428P", "versions": [ { "status": "affected", "version": "0", "lessThan": "V3.2", "versionType": "custom" } ], "defaultStatus": "unknown" }, { "vendor": "Siemens", "product": "SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 family", "versions": [ { "status": "affected", "version": "0", "lessThan": "V3.2", "versionType": "custom" } ], "defaultStatus": "unknown" }, { "vendor": "Siemens", "product": "SCALANCE XCM-/XRM-/XCH-/XRH-300 family", "versions": [ { "status": 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