{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2022-50490", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-10-04T15:39:19.463Z", "datePublished": "2025-10-04T15:43:43.790Z", "dateUpdated": "2026-08-05T08:58:56.510Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T08:58:56.510Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Propagate error from htab_lock_bucket() to userspace\n\nIn __htab_map_lookup_and_delete_batch() if htab_lock_bucket() returns\n-EBUSY, it will go to next bucket. Going to next bucket may not only\nskip the elements in current bucket silently, but also incur\nout-of-bound memory access or expose kernel memory to userspace if\ncurrent bucket_cnt is greater than bucket_size or zero.\n\nFixing it by stopping batch operation and returning -EBUSY when\nhtab_lock_bucket() fails, and the application can retry or skip the busy\nbatch as needed." } ], "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 bug is reached only via the bpf(2) syscall batch commands (BPF_MAP_LOOKUP_BATCH / BPF_MAP_LOOKUP_AND_DELETE_BATCH) on a hash map FD, which is a local syscall interface, not network-facing packet processing.\nAC:L - The attacker can drive both sides of the -EBUSY condition by racing map updates against a batch lookup on the same CPU (CONFIG_PREEMPT) or via map reentrancy, and syzkaller produced a reliable C reproducer for the slab-out-of-bounds read.\nPR:L - bpf_map_do_batch only requires a readable hash-map FD; BPF_MAP_TYPE_HASH maps are creatable by unprivileged users when unprivileged BPF is enabled, and map FDs are commonly shared with unprivileged processes, so CAP_SYS_ADMIN/CAP_BPF in the init namespace is not required.\nUI:N - Exploitation needs no victim action beyond the attacker issuing bpf syscalls against a map they can access.\nS:U - Impact stays within the local kernel/host authority; this is not a VM escape, IOMMU bypass, or other cross-boundary compromise.\nC:H - On htab_lock_bucket() -EBUSY, stale bucket_cnt causes copy_to_user of an oversized or never-filled keys/values buffer, yielding a slab out-of-bounds read that exposes adjacent kernel heap (and uninitialized kvmalloc contents) to userspace.\nI:N - The corrupted path only over-reads and copies kernel memory to userspace; the delete/update loops that would modify map state run only after a successful lock, so this bug does not provide a kernel write or control-flow hijack primitive.\nA:H - The OOB read was demonstrated as a KASAN slab-out-of-bounds fault that can panic under panic_on_warn, and a large attacker-controlled over-read can fault/oops the kernel, enabling local denial of service." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "kernel/bpf/hashtab.c" ], "versions": [ { "version": "20b6cc34ea74b6a84599c1f8a70f3315b56a1883", "lessThan": "0e13425104903970a5ede853082d3bbb4edec6f3", "status": "affected", "versionType": "git" }, { "version": "20b6cc34ea74b6a84599c1f8a70f3315b56a1883", "lessThan": "6bfee6eb3d6b96ae730a542909dd22b5f9f50d58", "status": "affected", "versionType": "git" }, { "version": "20b6cc34ea74b6a84599c1f8a70f3315b56a1883", "lessThan": "4f1f39a8f1ce1b24fee6852d7dcd704ce7c4334d", "status": "affected", "versionType": "git" }, { "version": "20b6cc34ea74b6a84599c1f8a70f3315b56a1883", "lessThan": "66a7a92e4d0d091e79148a4c6ec15d1da65f4280", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "kernel/bpf/hashtab.c" ], "versions": [ { "version": "5.11", "status": "affected" }, { "version": "0", "lessThan": "5.11", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.75", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.19.17", "lessThanOrEqual": "5.19.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.0.3", "lessThanOrEqual": "6.0.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1", "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": "5.11", "versionEndExcluding": "5.15.75" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.11", "versionEndExcluding": "5.19.17" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.11", "versionEndExcluding": "6.0.3" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.11", "versionEndExcluding": "6.1" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/0e13425104903970a5ede853082d3bbb4edec6f3" }, { "url": "https://git.kernel.org/stable/c/6bfee6eb3d6b96ae730a542909dd22b5f9f50d58" }, { "url": "https://git.kernel.org/stable/c/4f1f39a8f1ce1b24fee6852d7dcd704ce7c4334d" }, { "url": "https://git.kernel.org/stable/c/66a7a92e4d0d091e79148a4c6ec15d1da65f4280" } ], "title": "bpf: Propagate error from htab_lock_bucket() to userspace", "x_generator": { "engine": "bippy-1.2.0" } } } }