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CVE-2022-50490 (GCVE-0-2022-50490)

Vulnerability from cvelistv5 – Published: 2025-10-04 15:43 – Updated: 2026-08-05 08:58
VLAI
Title
bpf: Propagate error from htab_lock_bucket() to userspace
Summary
In the Linux kernel, the following vulnerability has been resolved: bpf: Propagate error from htab_lock_bucket() to userspace In __htab_map_lookup_and_delete_batch() if htab_lock_bucket() returns -EBUSY, it will go to next bucket. Going to next bucket may not only skip the elements in current bucket silently, but also incur out-of-bound memory access or expose kernel memory to userspace if current bucket_cnt is greater than bucket_size or zero. Fixing it by stopping batch operation and returning -EBUSY when htab_lock_bucket() fails, and the application can retry or skip the busy batch as needed.
Severity
7.1 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 20b6cc34ea74b6a84599c1f8a70f3315b56a1883 , < 0e13425104903970a5ede853082d3bbb4edec6f3 (git)
Affected: 20b6cc34ea74b6a84599c1f8a70f3315b56a1883 , < 6bfee6eb3d6b96ae730a542909dd22b5f9f50d58 (git)
Affected: 20b6cc34ea74b6a84599c1f8a70f3315b56a1883 , < 4f1f39a8f1ce1b24fee6852d7dcd704ce7c4334d (git)
Affected: 20b6cc34ea74b6a84599c1f8a70f3315b56a1883 , < 66a7a92e4d0d091e79148a4c6ec15d1da65f4280 (git)
guessed Create a notification for this product.
Linux Linux Affected: 5.11
Unaffected: 0 , < 5.11 (semver)
Unaffected: 5.15.75 , ≤ 5.15.* (semver)
Unaffected: 5.19.17 , ≤ 5.19.* (semver)
Unaffected: 6.0.3 , ≤ 6.0.* (semver)
Unaffected: 6.1 , ≤ * (original_commit_for_fix)
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          "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."
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              "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."
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    "assignerShortName": "Linux",
    "cveId": "CVE-2022-50490",
    "datePublished": "2025-10-04T15:43:43.790Z",
    "dateReserved": "2025-10-04T15:39:19.463Z",
    "dateUpdated": "2026-08-05T08:58:56.510Z",
    "state": "PUBLISHED"
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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.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"kernel/bpf/hashtab.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"20b6cc34ea74b6a84599c1f8a70f3315b56a1883\",\"lessThan\":\"0e13425104903970a5ede853082d3bbb4edec6f3\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"20b6cc34ea74b6a84599c1f8a70f3315b56a1883\",\"lessThan\":\"6bfee6eb3d6b96ae730a542909dd22b5f9f50d58\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"20b6cc34ea74b6a84599c1f8a70f3315b56a1883\",\"lessThan\":\"4f1f39a8f1ce1b24fee6852d7dcd704ce7c4334d\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"20b6cc34ea74b6a84599c1f8a70f3315b56a1883\",\"lessThan\":\"66a7a92e4d0d091e79148a4c6ec15d1da65f4280\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"kernel/bpf/hashtab.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"5.11\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"5.11\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.75\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.19.17\",\"lessThanOrEqual\":\"5.19.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.0.3\",\"lessThanOrEqual\":\"6.0.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"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\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.2},{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"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\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.2}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-125\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.11\",\"versionEndExcluding\":\"5.15.75\",\"matchCriteriaId\":\"6D945F46-F32F-4C09-8400-C3477E22A9FB\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.16\",\"versionEndExcluding\":\"5.19.17\",\"matchCriteriaId\":\"19B4C3A4-E5C3-41DC-BB14-BE72858E7D35\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.0\",\"versionEndExcluding\":\"6.0.3\",\"matchCriteriaId\":\"5BCD8201-B847-4442-B894-70D430128DEF\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/0e13425104903970a5ede853082d3bbb4edec6f3\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/4f1f39a8f1ce1b24fee6852d7dcd704ce7c4334d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/66a7a92e4d0d091e79148a4c6ec15d1da65f4280\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/6bfee6eb3d6b96ae730a542909dd22b5f9f50d58\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-04T19:37:42+00:00",
      "cve": "CVE-2022-50490",
      "id": "CVE-2022-50490",
      "initial_release_date": "2022-01-01T00:00:00+00:00",
      "product_status:known_affected": "156",
      "product_status:known_not_affected": "118",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: bpf: Propagate error from htab_lock_bucket() to userspace",
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      "cve": "CVE-2022-50490",
      "id": "CVE-2022-50490",
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      "product_status:known_not_affected": "395",
      "product_status:recommended": "219",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2022-50490",
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  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.


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