{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2024-49568", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-01-11T12:34:02.664Z", "datePublished": "2025-01-11T12:35:36.190Z", "dateUpdated": "2026-08-05T11:40:00.300Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:40:00.300Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/smc: check v2_ext_offset/eid_cnt/ism_gid_cnt when receiving proposal msg\n\nWhen receiving proposal msg in server, the fields v2_ext_offset/\neid_cnt/ism_gid_cnt in proposal msg are from the remote client\nand can not be fully trusted. Especially the field v2_ext_offset,\nonce exceed the max value, there has the chance to access wrong\naddress, and crash may happen.\n\nThis patch checks the fields v2_ext_offset/eid_cnt/ism_gid_cnt\nbefore 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:H/A:H", "baseScore": 9.8, "baseSeverity": "CRITICAL" }, "scenarios": [ { "lang": "en", "value": "AV:N - The malformed CLC proposal arrives as ordinary TCP payload from a remote peer on an SMC-enabled listening socket and is parsed by `smc_listen_work()`/`smc_clc_wait_msg()`. No local access or network adjacency is needed — any host that can reach the listener can trigger it.\nAC:L - The attacker controls every field involved (`version`, `typev1`, `typev2`, `iparea_offset`, `v2_ext_offset`) and an 8-byte payload deterministically produces the NULL dereference; the wild-pointer variant needs only a chosen 16-bit offset. No race, no memory-layout precondition, no state outside the attacker's control.\nPR:N - The CLC handshake runs immediately after the TCP three-way handshake, entirely before any application-level authentication, and `smc_clc_msg_prop_valid()` is the first validation performed on the peer's data. An unauthenticated remote attacker reaches it.\nUI:N - The kernel's listen worker parses the proposal automatically on connection accept; no local user or administrator action is required.\nS:U - The wild-pointer reads, writes and crash all occur within the kernel's own security authority; no VM, IOMMU or sandbox boundary is crossed.\nC:H - `v2_ext_offset` up to 65535 (vs. a legitimate max of 172) points the parser up to ~64 KB past a ~676-byte slab object, and the OOB-read `smcd_v2_ext_offset` extends that another 64 KB; `smc_clc_match_eid()` scans up to 8 KB of it and the OOB-read `max_conns`/`max_links` are negotiated and reflected back to the attacker. This is a wide, attacker-directed kernel memory read, not a bounded few-byte leak.\nI:H - Removing the `ism_gid_cnt` bound lets `smc_check_ism_v2_match()` write attacker-supplied 64-bit GIDs, `smcd_dev` pointers and CHIDs past the 9-element `ism_peer_gid`/`ism_dev`/`ism_chid` arrays in the kzalloc'd `struct smc_init_info` on hosts with ≥10 SMC-D devices, and uncontrolled OOB-read bytes (`roce[]`, `system_eid`, GIDs) are installed as the link group's RDMA/ISM connection parameters.\nA:H - An 8-byte packet yields a guaranteed NULL-pointer oops in the `smc_hs_wq` worker while `lock_sock()` is held (full panic under `panic_on_oops`), and the wild-pointer faults occur while holding the global `smc_server_lgr_pending` mutex, permanently deadlocking every subsequent SMC server handshake. It is repeatable at will from an unauthenticated connection." } ] } ], "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": "8c3dca341aea885249e08856c4380300b75d2cf5", "lessThan": "295a92e3df32e72aff0f4bc25c310e349d07ffbf", "status": "affected", "versionType": "git" }, { "version": "8c3dca341aea885249e08856c4380300b75d2cf5", "lessThan": "42f6beb2d5779429417b5f8115a4e3fa695d2a6c", "status": "affected", "versionType": "git" }, { "version": "8c3dca341aea885249e08856c4380300b75d2cf5", "lessThan": "7863c9f3d24ba49dbead7e03dfbe40deb5888fdf", "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": "5.10", "status": "affected" }, { "version": "0", "lessThan": "5.10", "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": "5.10", "versionEndExcluding": "6.6.68" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10", "versionEndExcluding": "6.12.7" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10", "versionEndExcluding": "6.13" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/295a92e3df32e72aff0f4bc25c310e349d07ffbf" }, { "url": "https://git.kernel.org/stable/c/42f6beb2d5779429417b5f8115a4e3fa695d2a6c" }, { "url": "https://git.kernel.org/stable/c/7863c9f3d24ba49dbead7e03dfbe40deb5888fdf" } ], "title": "net/smc: check v2_ext_offset/eid_cnt/ism_gid_cnt when receiving proposal msg", "x_generator": { "engine": "bippy-1.2.0" } } } }