{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2024-50293", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-10-21T19:36:19.986Z", "datePublished": "2024-11-19T01:30:39.362Z", "dateUpdated": "2026-08-05T11:43:09.027Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:43:09.027Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/smc: do not leave a dangling sk pointer in __smc_create()\n\nThanks to commit 4bbd360a5084 (\"socket: Print pf->create() when\nit does not clear sock->sk on failure.\"), syzbot found an issue with AF_SMC:\n\nsmc_create must clear sock->sk on failure, family: 43, type: 1, protocol: 0\n WARNING: CPU: 0 PID: 5827 at net/socket.c:1565 __sock_create+0x96f/0xa30 net/socket.c:1563\nModules linked in:\nCPU: 0 UID: 0 PID: 5827 Comm: syz-executor259 Not tainted 6.12.0-rc6-next-20241106-syzkaller #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024\n RIP: 0010:__sock_create+0x96f/0xa30 net/socket.c:1563\nCode: 03 00 74 08 4c 89 e7 e8 4f 3b 85 f8 49 8b 34 24 48 c7 c7 40 89 0c 8d 8b 54 24 04 8b 4c 24 0c 44 8b 44 24 08 e8 32 78 db f7 90 <0f> 0b 90 90 e9 d3 fd ff ff 89 e9 80 e1 07 fe c1 38 c1 0f 8c ee f7\nRSP: 0018:ffffc90003e4fda0 EFLAGS: 00010246\nRAX: 099c6f938c7f4700 RBX: 1ffffffff1a595fd RCX: ffff888034823c00\nRDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000\nRBP: 00000000ffffffe9 R08: ffffffff81567052 R09: 1ffff920007c9f50\nR10: dffffc0000000000 R11: fffff520007c9f51 R12: ffffffff8d2cafe8\nR13: 1ffffffff1a595fe R14: ffffffff9a789c40 R15: ffff8880764298c0\nFS: 000055557b518380(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000\nCS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\nCR2: 00007fa62ff43225 CR3: 0000000031628000 CR4: 00000000003526f0\nDR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\nDR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\nCall Trace:\n \n sock_create net/socket.c:1616 [inline]\n __sys_socket_create net/socket.c:1653 [inline]\n __sys_socket+0x150/0x3c0 net/socket.c:1700\n __do_sys_socket net/socket.c:1714 [inline]\n __se_sys_socket net/socket.c:1712 [inline]\n\nFor reference, see commit 2d859aff775d (\"Merge branch\n'do-not-leave-dangling-sk-pointers-in-pf-create-functions'\")" } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - The vulnerable code is reached only through the local `socket(AF_SMC, SOCK_STREAM, ...)` syscall or `setsockopt(TCP_ULP, \"smc\")` on a local TCP socket; no remote peer data reaches `__smc_create()`.\nAC:L - The attacker fully controls the failure condition — `socket(AF_SMC, SOCK_STREAM, SMCPROTO_SMC6)` fails deterministically with -EAFNOSUPPORT when IPv6 is absent, and otherwise the `sock_create_kern()` allocation can be forced to fail via attacker-created memcg pressure with unlimited cheap retries.\nPR:L - No capability check exists anywhere on the path — `__smc_create()` and its callers perform no `capable()`/`CAP_NET_ADMIN` test, and the smc module is autoloaded by the unprivileged `socket()` call itself via `request_module(\"net-pf-43\")`.\nUI:N - The attacker triggers the entire sequence from its own process with a single syscall; no victim action or interaction is required.\nS:U - The dangling pointer and any resulting corruption stay within the kernel's own security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The stale `sock->sk` points into a freed `struct smc_sock` on a sprayable slab, so a subsequent dereference reads attacker-reallocated memory, giving a use-after-free read primitive usable for kernel memory disclosure.\nI:H - Use-after-free on a freed socket object whose contents (including function-pointer-bearing fields such as `sk_prot`, `sk_socket`, and callback pointers) can be replaced by heap spraying yields a write/control-flow-hijack primitive.\nA:H - Dereferencing the dangling `sk` pointer causes a use-after-free that reliably oopses or panics the kernel, and the condition is repeatable at will by an unprivileged process." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/smc/af_smc.c" ], "versions": [ { "version": "d25a92ccae6bed02327b63d138e12e7806830f78", "lessThan": "d2cc492124e1f22daa1700f069bcc58788043381", "status": "affected", "versionType": "git" }, { "version": "d25a92ccae6bed02327b63d138e12e7806830f78", "lessThan": "d293958a8595ba566fb90b99da4d6263e14fee15", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/smc/af_smc.c" ], "versions": [ { "version": "6.11", "status": "affected" }, { "version": "0", "lessThan": "6.11", "status": "unaffected", "versionType": "semver" }, { "version": "6.11.8", "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": "6.11", "versionEndExcluding": "6.11.8" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.11", "versionEndExcluding": "6.12" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/d2cc492124e1f22daa1700f069bcc58788043381" }, { "url": "https://git.kernel.org/stable/c/d293958a8595ba566fb90b99da4d6263e14fee15" } ], "title": "net/smc: do not leave a dangling sk pointer in __smc_create()", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "metrics": [ { "cvssV3_1": { "scope": "UNCHANGED", "version": "3.1", "baseScore": 7.8, "attackVector": "LOCAL", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH" } }, { "other": { "type": "ssvc", "content": { "id": "CVE-2024-50293", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "total" } ], "version": "2.0.3", "timestamp": "2025-10-01T20:14:14.617701Z" } } } ], "problemTypes": [ { "descriptions": [ { "lang": "en", "type": "CWE", "cweId": "CWE-416", "description": "CWE-416 Use After Free" } ] } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2025-10-01T20:17:20.758Z" } } ] } }