Vulnerability-Lookup

GHSA-49R4-JVJJ-Q7X6

Vulnerability from github – Published: 2025-10-04 18:31 – Updated: 2026-01-27 18:32

Details

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

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{
  "affected": [],
  "aliases": [
    "CVE-2022-50490"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-125"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-10-04T16:15:45Z",
    "severity": "HIGH"
  },
  "details": "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.",
  "id": "GHSA-49r4-jvjj-q7x6",
  "modified": "2026-01-27T18:32:06Z",
  "published": "2025-10-04T18:31:14Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2022-50490"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0e13425104903970a5ede853082d3bbb4edec6f3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4f1f39a8f1ce1b24fee6852d7dcd704ce7c4334d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/66a7a92e4d0d091e79148a4c6ec15d1da65f4280"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6bfee6eb3d6b96ae730a542909dd22b5f9f50d58"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}

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

Vulnerability from cvelistv5 – Published: 2025-10-04 15:43 – Updated: 2026-08-05 08:58

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

Linux mitre root

References

4 references

URL	Tags
https://git.kernel.org/stable/c/0e13425104903970a…
https://git.kernel.org/stable/c/6bfee6eb3d6b96ae7…
https://git.kernel.org/stable/c/4f1f39a8f1ce1b24f…
https://git.kernel.org/stable/c/66a7a92e4d0d091e7…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 20b6cc34ea74b6a84599c1f8a70f3315b56a1883 , < 0e13425104903970a5ede853082d3bbb4edec6f3 (git) Affected: 20b6cc34ea74b6a84599c1f8a70f3315b56a1883 , < 6bfee6eb3d6b96ae730a542909dd22b5f9f50d58 (git) Affected: 20b6cc34ea74b6a84599c1f8a70f3315b56a1883 , < 4f1f39a8f1ce1b24fee6852d7dcd704ce7c4334d (git) Affected: 20b6cc34ea74b6a84599c1f8a70f3315b56a1883 , < 66a7a92e4d0d091e79148a4c6ec15d1da65f4280 (git)
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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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "kernel/bpf/hashtab.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "status": "affected",
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              "versionType": "git"
            },
            {
              "lessThan": "6bfee6eb3d6b96ae730a542909dd22b5f9f50d58",
              "status": "affected",
              "version": "20b6cc34ea74b6a84599c1f8a70f3315b56a1883",
              "versionType": "git"
            },
            {
              "lessThan": "4f1f39a8f1ce1b24fee6852d7dcd704ce7c4334d",
              "status": "affected",
              "version": "20b6cc34ea74b6a84599c1f8a70f3315b56a1883",
              "versionType": "git"
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              "version": "20b6cc34ea74b6a84599c1f8a70f3315b56a1883",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
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            "kernel/bpf/hashtab.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.11"
            },
            {
              "lessThan": "5.11",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.75",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.19.*",
              "status": "unaffected",
              "version": "5.19.17",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.0.*",
              "status": "unaffected",
              "version": "6.0.3",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.75",
                  "versionStartIncluding": "5.11",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                },
                {
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                  "vulnerable": true
                },
                {
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                  "versionStartIncluding": "5.11",
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                }
              ],
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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."
        }
      ],
      "metrics": [
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            "version": "3.1"
          },
          "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."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T08:58:56.510Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/0e13425104903970a5ede853082d3bbb4edec6f3"
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          "url": "https://git.kernel.org/stable/c/6bfee6eb3d6b96ae730a542909dd22b5f9f50d58"
        },
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          "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"
      }
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  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "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"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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