{ "dataType": "CVE_RECORD", "cveMetadata": { "cveId": "CVE-2024-35962", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-05-17T13:50:33.137Z", "datePublished": "2024-05-20T09:41:53.207Z", "dateUpdated": "2026-08-05T11:31:13.953Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:31:13.953Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: complete validation of user input\n\nIn my recent commit, I missed that do_replace() handlers\nuse copy_from_sockptr() (which I fixed), followed\nby unsafe copy_from_sockptr_offset() calls.\n\nIn all functions, we can perform the @optlen validation\nbefore even calling xt_alloc_table_info() with the following\ncheck:\n\nif ((u64)optlen < (u64)tmp.size + sizeof(tmp))\n return -EINVAL;" } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H", "baseScore": 7.1, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - The vulnerability is reached through the local `setsockopt(SOL_IP, IPT_SO_SET_REPLACE, ...)` syscall on a locally-opened socket, via `nf_setsockopt()` → `do_ipt_set_ctl()` → `do_replace()`. No network packet or remote peer data reaches this code path.\nAC:L - The attacker fully controls `tmp.size` and `optlen` and triggers the oversized `memcpy()` deterministically on every call — no race, no memory-layout luck, and no retry needed. The kernel-sockptr precondition is satisfied by any attached cgroup/setsockopt BPF program (even a no-op one, since `ctx.optlen` defaults to the original `optlen`), which is standard in container environments running Cilium and similar tooling on default `CONFIG_CGROUP_BPF=y` kernels.\nPR:L - `do_ipt_set_ctl()` gates on `ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)`, which any unprivileged user obtains with `unshare -Urn`; entering a new user/net namespace leaves cgroup membership intact so the BPF sockopt hook still applies. No real root in the initial namespace is required.\nUI:N - The attacker performs the entire sequence — socket creation, namespace setup, and the malformed setsockopt call — with no action by any other user or victim process.\nS:U - The out-of-bounds read occurs in kernel slab memory and its impact is confined to the kernel's own security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - This is an unbounded out-of-bounds read — up to `XT_MAX_TABLE_SIZE` (512 MB) copied from a ≤PAGE_SIZE slab object into the netfilter table buffer, far beyond a \"few bytes\". With heap grooming to keep the resulting `ipt_entry` chain valid through `translate_table()`, the harvested kernel heap contents (pointers, keys, credentials, defeating KASLR) can be read back via `getsockopt(IPT_SO_GET_ENTRIES)`.\nI:N - The defect is purely an over-read; the destination buffer is correctly sized by `xt_alloc_table_info(tmp.size)`, so no memory outside an allocation is written and no control-flow or data corruption primitive is produced.\nA:H - A large attacker-chosen `tmp.size` makes the kernel `memcpy()` run hundreds of megabytes past the end of a small slab object, reliably hitting unmapped memory and causing a page fault in kernel context — an oops/panic — and the crash is trivially repeatable by any unprivileged local user." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/ipv4/netfilter/arp_tables.c", "net/ipv4/netfilter/ip_tables.c", "net/ipv6/netfilter/ip6_tables.c" ], "versions": [ { "version": "0f038242b77ddfc505bf4163d4904c1abd2e74d6", "lessThan": "cf4bc359b76144a3dd55d7c09464ef4c5f2b2b05", "status": "affected", "versionType": "git" }, { "version": "440e948cf0eff32cfe322dcbca3f2525354b159b", "lessThan": "97dab36e57c64106e1c8ebd66cbf0d2d1e52d6b7", "status": "affected", "versionType": "git" }, { "version": "18aae2cb87e5faa9c5bd865260ceadac60d5a6c5", "lessThan": "c760089aa98289b4b88a7ff5a62dd92845adf223", "status": "affected", "versionType": "git" }, { "version": "81d51b9b7c95e791ba3c1a2dd77920a9d3b3f525", "lessThan": "89242d9584c342cb83311b598d9e6b82572eadf8", "status": "affected", "versionType": "git" }, { "version": "58f2bfb789e6bd3bc24a2c9c1580f3c67aec3018", "lessThan": "562b7245131f6e9f1d280c8b5a8750f03edfc05c", "status": "affected", "versionType": "git" }, { "version": "0c83842df40f86e529db6842231154772c20edcc", "lessThan": "65acf6e0501ac8880a4f73980d01b5d27648b956", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/ipv4/netfilter/arp_tables.c", "net/ipv4/netfilter/ip_tables.c", "net/ipv6/netfilter/ip6_tables.c" ], "versions": [ { "version": "5.10.215", "lessThan": "5.10.216", "status": "affected", "versionType": "semver" }, { "version": "5.15.154", "lessThan": "5.15.156", "status": "affected", "versionType": "semver" }, { "version": "6.1.85", "lessThan": "6.1.87", "status": "affected", "versionType": "semver" }, { "version": "6.6.26", "lessThan": "6.6.28", "status": "affected", "versionType": "semver" }, { "version": "6.8.5", "lessThan": "6.8.7", "status": "affected", "versionType": "semver" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10.215", "versionEndExcluding": "5.10.216" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15.154", "versionEndExcluding": "5.15.156" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.1.85", "versionEndExcluding": "6.1.87" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.6.26", "versionEndExcluding": "6.6.28" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.8.5", "versionEndExcluding": "6.8.7" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/cf4bc359b76144a3dd55d7c09464ef4c5f2b2b05" }, { "url": "https://git.kernel.org/stable/c/97dab36e57c64106e1c8ebd66cbf0d2d1e52d6b7" }, { "url": "https://git.kernel.org/stable/c/c760089aa98289b4b88a7ff5a62dd92845adf223" }, { "url": "https://git.kernel.org/stable/c/89242d9584c342cb83311b598d9e6b82572eadf8" }, { "url": "https://git.kernel.org/stable/c/562b7245131f6e9f1d280c8b5a8750f03edfc05c" }, { "url": "https://git.kernel.org/stable/c/65acf6e0501ac8880a4f73980d01b5d27648b956" } ], "title": "netfilter: complete validation of user input", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "providerMetadata": { "orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-02T03:21:49.038Z" }, "title": "CVE Program Container", "references": [ { "url": "https://git.kernel.org/stable/c/cf4bc359b76144a3dd55d7c09464ef4c5f2b2b05", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/97dab36e57c64106e1c8ebd66cbf0d2d1e52d6b7", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/c760089aa98289b4b88a7ff5a62dd92845adf223", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/89242d9584c342cb83311b598d9e6b82572eadf8", "tags": [ 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"affected": [ { "vendor": "Siemens", "product": "RUGGEDCOM RST2428P", "versions": [ { "status": "affected", "version": "0", "lessThan": "V3.1", "versionType": "custom" } ], "defaultStatus": "unknown" }, { "vendor": "Siemens", "product": "SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 family", "versions": [ { "status": "unaffected", "version": "0", "lessThan": "*", "versionType": "custom" } ], "defaultStatus": "unknown" }, { "vendor": "Siemens", "product": "SCALANCE XCM-/XRM-/XCH-/XRH-300 family", "versions": [ { "status": "affected", "version": "0", "lessThan": "V3.1", "versionType": "custom" } ], "defaultStatus": "unknown" }, { "vendor": "Siemens", "product": "SIMATIC S7-1500 TM MFP - GNU/Linux subsystem", "versions": [ { "status": "affected", "version": "0", "lessThan": "*", "versionType": "custom" } ], "defaultStatus": "unknown" } ], "references": [ { "url": "https://cert-portal.siemens.com/productcert/html/ssa-265688.html" }, { "url": "https://cert-portal.siemens.com/productcert/html/ssa-613116.html" } ] } ] }, "dataVersion": "5.2" }