{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2024-49861", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-10-21T12:17:06.017Z", "datePublished": "2024-10-21T12:27:19.321Z", "dateUpdated": "2026-08-05T11:40:09.965Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:40:09.965Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Fix helper writes to read-only maps\n\nLonial found an issue that despite user- and BPF-side frozen BPF map\n(like in case of .rodata), it was still possible to write into it from\na BPF program side through specific helpers having ARG_PTR_TO_{LONG,INT}\nas arguments.\n\nIn check_func_arg() when the argument is as mentioned, the meta->raw_mode\nis never set. Later, check_helper_mem_access(), under the case of\nPTR_TO_MAP_VALUE as register base type, it assumes BPF_READ for the\nsubsequent call to check_map_access_type() and given the BPF map is\nread-only it succeeds.\n\nThe helpers really need to be annotated as ARG_PTR_TO_{LONG,INT} | MEM_UNINIT\nwhen results are written into them as opposed to read out of them. The\nlatter indicates that it's okay to pass a pointer to uninitialized memory\nas the memory is written to anyway.\n\nHowever, ARG_PTR_TO_{LONG,INT} is a special case of ARG_PTR_TO_FIXED_SIZE_MEM\njust with additional alignment requirement. So it is better to just get\nrid of the ARG_PTR_TO_{LONG,INT} special cases altogether and reuse the\nfixed size memory types. For this, add MEM_ALIGNED to additionally ensure\nalignment given these helpers write directly into the args via * = val.\nThe .arg*_size has been initialized reflecting the actual sizeof(*).\n\nMEM_ALIGNED can only be used in combination with MEM_FIXED_SIZE annotated\nargument types, since in !MEM_FIXED_SIZE cases the verifier does not know\nthe buffer size a priori and therefore cannot blindly write * = val." } ], "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 vulnerability is reached by loading and running a crafted eBPF program via the local bpf() syscall; there is no network-facing path to the verifier.\nAC:L - The verifier flaw is triggered deterministically by a specifically crafted BPF program passing a rodata map pointer to an affected helper—no race or attacker-uncontrolled condition is involved.\nPR:L - The affected helpers (bpf_strtol/bpf_strtoul) are in the unprivileged tier of bpf_base_func_proto and reachable by unprivileged socket-filter programs when unprivileged BPF is enabled; an ordinary local account suffices.\nUI:N - The attacker loads and executes their own BPF program; no action from any other user is required.\nS:U - The corruption and resulting privilege escalation occur within the kernel's own security authority; no VM/IOMMU/sandbox boundary is crossed.\nC:H - Writing into a frozen read-only map defeats the verifier's constant-folding soundness, enabling out-of-bounds/arbitrary kernel memory reads and disclosure.\nI:H - The bug is a verifier bypass giving a write into memory the verifier assumed immutable, the canonical primitive for arbitrary kernel write and code-execution/privilege escalation.\nA:H - The resulting memory corruption can crash or fully compromise the kernel." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "include/linux/bpf.h", "kernel/bpf/helpers.c", "kernel/bpf/syscall.c", "kernel/bpf/verifier.c", "kernel/trace/bpf_trace.c", "net/core/filter.c" ], "versions": [ { "version": "57c3bb725a3dd97d960d7e1cd0845d88de53217f", "lessThan": "988e55abcf7fdb8fc9a76a7cf3f4e939a4d4fb3a", "status": "affected", "versionType": "git" }, { "version": "57c3bb725a3dd97d960d7e1cd0845d88de53217f", "lessThan": "a2c8dc7e21803257e762b0bf067fd13e9c995da0", "status": "affected", "versionType": "git" }, { "version": "57c3bb725a3dd97d960d7e1cd0845d88de53217f", "lessThan": "2ed98ee02d1e08afee88f54baec39ea78dc8a23c", "status": "affected", "versionType": "git" }, { "version": "57c3bb725a3dd97d960d7e1cd0845d88de53217f", "lessThan": "1e75d25133158b525e0456876e9bcfd6b2993fd5", "status": "affected", "versionType": "git" }, { "version": "57c3bb725a3dd97d960d7e1cd0845d88de53217f", "lessThan": "32556ce93bc45c730829083cb60f95a2728ea48b", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "include/linux/bpf.h", "kernel/bpf/helpers.c", "kernel/bpf/syscall.c", "kernel/bpf/verifier.c", "kernel/trace/bpf_trace.c", "net/core/filter.c" ], "versions": [ { "version": "5.2", "status": "affected" }, { "version": "0", "lessThan": "5.2", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.120", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.54", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.10.13", "lessThanOrEqual": "6.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.11.2", "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": "5.2", "versionEndExcluding": "6.1.120" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.2", "versionEndExcluding": "6.6.54" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.2", "versionEndExcluding": "6.10.13" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.2", "versionEndExcluding": "6.11.2" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.2", "versionEndExcluding": "6.12" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/988e55abcf7fdb8fc9a76a7cf3f4e939a4d4fb3a" }, { "url": "https://git.kernel.org/stable/c/a2c8dc7e21803257e762b0bf067fd13e9c995da0" }, { "url": "https://git.kernel.org/stable/c/2ed98ee02d1e08afee88f54baec39ea78dc8a23c" }, { "url": "https://git.kernel.org/stable/c/1e75d25133158b525e0456876e9bcfd6b2993fd5" }, { "url": "https://git.kernel.org/stable/c/32556ce93bc45c730829083cb60f95a2728ea48b" } ], "title": "bpf: Fix helper writes to read-only maps", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "metrics": [ { "other": { "type": "ssvc", "content": { "id": "CVE-2024-49861", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "partial" } ], "version": "2.0.3", "timestamp": "2024-10-21T12:55:39.105078Z" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-10-21T13:04:10.325Z" } }, { "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": "2025-11-03T20:41:16.087Z" } } ] } }