{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2024-49571", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-01-11T12:33:33.704Z", "datePublished": "2025-01-11T12:35:36.957Z", "dateUpdated": "2026-08-05T11:40:02.429Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:40:02.429Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/smc: check iparea_offset and ipv6_prefixes_cnt when receiving proposal msg\n\nWhen receiving proposal msg in server, the field iparea_offset\nand the field ipv6_prefixes_cnt in proposal msg are from the\nremote client and can not be fully trusted. Especially the\nfield iparea_offset, once exceed the max value, there has the\nchance to access wrong address, and crash may happen.\n\nThis patch checks iparea_offset and ipv6_prefixes_cnt before using them." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H", "baseScore": 9.1, "baseSeverity": "CRITICAL" }, "scenarios": [ { "lang": "en", "value": "AV:N - The malformed CLC Proposal is received over a routable TCP connection by the in-kernel SMC listener (`smc_listen_work()`), with all attacker-controlled fields (`iparea_offset`, `ipv6_prefixes_cnt`, `hdr.length`, `typev1`) coming straight off the wire. Any remote host that can reach an SMC-enabled listening socket can deliver it.\nAC:L - The attacker fully controls every field involved; no race, memory grooming, or unpredictable state is needed, and the only variable — the server's IP prefix length for `smc_clc_prfx_match4_rcu()` — is brute-forceable in at most 32 connections. The OOB read in `smc_clc_msg_prop_valid()` triggers on the very first packet with no preconditions at all.\nPR:N - The CLC handshake is the first exchange after TCP accept and SMC performs no authentication whatsoever, so the vulnerable parsing runs entirely pre-authentication. The attacker needs only the ability to complete a TCP handshake with the SMC experimental option set.\nUI:N - The server-side listen worker parses the proposal automatically upon connection; no action by any local user or administrator is required. A single unsolicited connection suffices.\nS:U - The out-of-bounds reads and the NULL dereference occur within the kernel's own memory and security authority, with no crossing of a VM, IOMMU, or sandbox boundary. Impact is confined to the kernel that parsed the message.\nC:H - `iparea_offset` lets the prefix pointer land up to ~64 KB past a ~656-byte kmalloc-1k object, and the OOB-read `ipv6_prefixes_cnt` is checked for equality against the attacker's own `hdr->length`, making success remotely observable — a byte-granular read oracle over a large window of adjacent kernel heap (kernel pointers, other sockets' data). `smc_clc_prfx_match()` reads ~144 further OOB bytes and reflects the result back as a decline reason, so this is far more than a strictly bounded few-byte read.\nI:N - The out-of-bounds pointer is only ever dereferenced for reads (`smc_clc_msg_prop_valid()`, `smc_clc_prfx_match4_rcu()`/`match6_rcu()`), and the additional defect is a NULL-pointer read; no attacker-controlled data is written out of bounds and no control-flow hijack primitive arises.\nA:H - With `typev1=SMC_TYPE_D` and `iparea_offset != 40`, `smc_find_ism_v1_device_serv()` dereferences a NULL `pclc_smcd`, oopsing the `smc_hs_wq` worker while `smc_server_lgr_pending` and the socket lock are held and never released, permanently deadlocking all further SMC server handshakes; the far OOB read can also fault on unmapped memory, and `panic_on_oops` turns either into a full system panic." } ] } ], "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", "net/smc/smc_clc.c", "net/smc/smc_clc.h" ], "versions": [ { "version": "e7b7a64a8493d47433fd003efbe6543e3f676294", "lessThan": "846bada23bfcdeb83621b045ed85dc06c7833ff0", "status": "affected", "versionType": "git" }, { "version": "e7b7a64a8493d47433fd003efbe6543e3f676294", "lessThan": "f10635268a0a49ee902a3b63b5dbb76f4fed498e", "status": "affected", "versionType": "git" }, { "version": "e7b7a64a8493d47433fd003efbe6543e3f676294", "lessThan": "62056d1592e63d85e82357ee2ae6a6a294f440b0", "status": "affected", "versionType": "git" }, { "version": "e7b7a64a8493d47433fd003efbe6543e3f676294", "lessThan": "91a7c27c1444ed4677b83fd5308d2cf03f5f0851", "status": "affected", "versionType": "git" }, { "version": "e7b7a64a8493d47433fd003efbe6543e3f676294", "lessThan": "47ce46349672a7e0c361bfe39ed0b22e824ef4fb", "status": "affected", "versionType": "git" }, { "version": "e7b7a64a8493d47433fd003efbe6543e3f676294", "lessThan": "a29e220d3c8edbf0e1beb0f028878a4a85966556", "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", "net/smc/smc_clc.c", "net/smc/smc_clc.h" ], "versions": [ { "version": "4.16", "status": "affected" }, { "version": "0", "lessThan": "4.16", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.233", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.176", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.122", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.68", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.7", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.13", "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": "4.16", "versionEndExcluding": "5.10.233" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.16", "versionEndExcluding": "5.15.176" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.16", "versionEndExcluding": "6.1.122" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.16", "versionEndExcluding": "6.6.68" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.16", "versionEndExcluding": "6.12.7" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.16", "versionEndExcluding": "6.13" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/846bada23bfcdeb83621b045ed85dc06c7833ff0" }, { "url": "https://git.kernel.org/stable/c/f10635268a0a49ee902a3b63b5dbb76f4fed498e" }, { "url": "https://git.kernel.org/stable/c/62056d1592e63d85e82357ee2ae6a6a294f440b0" }, { "url": "https://git.kernel.org/stable/c/91a7c27c1444ed4677b83fd5308d2cf03f5f0851" }, { "url": "https://git.kernel.org/stable/c/47ce46349672a7e0c361bfe39ed0b22e824ef4fb" }, { "url": "https://git.kernel.org/stable/c/a29e220d3c8edbf0e1beb0f028878a4a85966556" } ], "title": "net/smc: check iparea_offset and ipv6_prefixes_cnt when receiving proposal msg", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "title": "CVE Program Container", "references": [ { "url": "https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html" } ], "providerMetadata": { "orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2025-11-03T20:41:09.035Z" } } ] } }