CVE-2022-50753 (GCVE-0-2022-50753)

Vulnerability from cvelistv5 – Published: 2025-12-24 13:05 – Updated: 2026-08-05 08:59
VLAI
Title
f2fs: fix to do sanity check on summary info
Summary
In the Linux kernel, the following vulnerability has been resolved: f2fs: fix to do sanity check on summary info As Wenqing Liu reported in bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=216456 BUG: KASAN: use-after-free in recover_data+0x63ae/0x6ae0 [f2fs] Read of size 4 at addr ffff8881464dcd80 by task mount/1013 CPU: 3 PID: 1013 Comm: mount Tainted: G W 6.0.0-rc4 #1 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.15.0-1 04/01/2014 Call Trace: dump_stack_lvl+0x45/0x5e print_report.cold+0xf3/0x68d kasan_report+0xa8/0x130 recover_data+0x63ae/0x6ae0 [f2fs] f2fs_recover_fsync_data+0x120d/0x1fc0 [f2fs] f2fs_fill_super+0x4665/0x61e0 [f2fs] mount_bdev+0x2cf/0x3b0 legacy_get_tree+0xed/0x1d0 vfs_get_tree+0x81/0x2b0 path_mount+0x47e/0x19d0 do_mount+0xce/0xf0 __x64_sys_mount+0x12c/0x1a0 do_syscall_64+0x38/0x90 entry_SYSCALL_64_after_hwframe+0x63/0xcd The root cause is: in fuzzed image, SSA table is corrupted: ofs_in_node is larger than ADDRS_PER_PAGE(), result in out-of-range access on 4k-size page. - recover_data - do_recover_data - check_index_in_prev_nodes - f2fs_data_blkaddr This patch adds sanity check on summary info in recovery and GC flow in where the flows rely on them. After patch: [ 29.310883] F2FS-fs (loop0): Inconsistent ofs_in_node:65286 in summary, ino:0, nid:6, max:1018
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: b292dcab068e141d8a820b77cbcc88d98c610eb4 , < c99860f9a75079f339ed7670425b1ac58f26e2ff (git)
Affected: b292dcab068e141d8a820b77cbcc88d98c610eb4 , < 4a8e8bf280703e04e0b9d91f101e1fdd9a5bd09e (git)
Affected: b292dcab068e141d8a820b77cbcc88d98c610eb4 , < 73687c53919f49dff3852155621dab7a35c52854 (git)
Affected: b292dcab068e141d8a820b77cbcc88d98c610eb4 , < e168f819bfa42459b14f479e55ebd550bcc78899 (git)
Affected: b292dcab068e141d8a820b77cbcc88d98c610eb4 , < 0922ad64ccefa3e483e84355942b86e13c8fea68 (git)
Affected: b292dcab068e141d8a820b77cbcc88d98c610eb4 , < c6ad7fd16657ebd34a87a97d9588195aae87597d (git)
guessed Create a notification for this product.
Linux Linux Affected: 3.11
Unaffected: 0 , < 3.11 (semver)
Unaffected: 5.4.220 , ≤ 5.4.* (semver)
Unaffected: 5.10.150 , ≤ 5.10.* (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)
guessed Create a notification for this product.
Show details on NVD website
To clipboard 

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/f2fs/gc.c",
            "fs/f2fs/recovery.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "c99860f9a75079f339ed7670425b1ac58f26e2ff",
              "status": "affected",
              "version": "b292dcab068e141d8a820b77cbcc88d98c610eb4",
              "versionType": "git"
            },
            {
              "lessThan": "4a8e8bf280703e04e0b9d91f101e1fdd9a5bd09e",
              "status": "affected",
              "version": "b292dcab068e141d8a820b77cbcc88d98c610eb4",
              "versionType": "git"
            },
            {
              "lessThan": "73687c53919f49dff3852155621dab7a35c52854",
              "status": "affected",
              "version": "b292dcab068e141d8a820b77cbcc88d98c610eb4",
              "versionType": "git"
            },
            {
              "lessThan": "e168f819bfa42459b14f479e55ebd550bcc78899",
              "status": "affected",
              "version": "b292dcab068e141d8a820b77cbcc88d98c610eb4",
              "versionType": "git"
            },
            {
              "lessThan": "0922ad64ccefa3e483e84355942b86e13c8fea68",
              "status": "affected",
              "version": "b292dcab068e141d8a820b77cbcc88d98c610eb4",
              "versionType": "git"
            },
            {
              "lessThan": "c6ad7fd16657ebd34a87a97d9588195aae87597d",
              "status": "affected",
              "version": "b292dcab068e141d8a820b77cbcc88d98c610eb4",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/f2fs/gc.c",
            "fs/f2fs/recovery.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "3.11"
            },
            {
              "lessThan": "3.11",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.4.*",
              "status": "unaffected",
              "version": "5.4.220",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.150",
              "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": "5.4.220",
                  "versionStartIncluding": "3.11",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.150",
                  "versionStartIncluding": "3.11",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.75",
                  "versionStartIncluding": "3.11",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.19.17",
                  "versionStartIncluding": "3.11",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.0.3",
                  "versionStartIncluding": "3.11",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1",
                  "versionStartIncluding": "3.11",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nf2fs: fix to do sanity check on summary info\n\nAs Wenqing Liu reported in bugzilla:\n\nhttps://bugzilla.kernel.org/show_bug.cgi?id=216456\n\nBUG: KASAN: use-after-free in recover_data+0x63ae/0x6ae0 [f2fs]\nRead of size 4 at addr ffff8881464dcd80 by task mount/1013\n\nCPU: 3 PID: 1013 Comm: mount Tainted: G        W          6.0.0-rc4 #1\nHardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.15.0-1 04/01/2014\nCall Trace:\n dump_stack_lvl+0x45/0x5e\n print_report.cold+0xf3/0x68d\n kasan_report+0xa8/0x130\n recover_data+0x63ae/0x6ae0 [f2fs]\n f2fs_recover_fsync_data+0x120d/0x1fc0 [f2fs]\n f2fs_fill_super+0x4665/0x61e0 [f2fs]\n mount_bdev+0x2cf/0x3b0\n legacy_get_tree+0xed/0x1d0\n vfs_get_tree+0x81/0x2b0\n path_mount+0x47e/0x19d0\n do_mount+0xce/0xf0\n __x64_sys_mount+0x12c/0x1a0\n do_syscall_64+0x38/0x90\n entry_SYSCALL_64_after_hwframe+0x63/0xcd\n\nThe root cause is: in fuzzed image, SSA table is corrupted: ofs_in_node\nis larger than ADDRS_PER_PAGE(), result in out-of-range access on 4k-size\npage.\n\n- recover_data\n - do_recover_data\n  - check_index_in_prev_nodes\n   - f2fs_data_blkaddr\n\nThis patch adds sanity check on summary info in recovery and GC flow\nin where the flows rely on them.\n\nAfter patch:\n[   29.310883] F2FS-fs (loop0): Inconsistent ofs_in_node:65286 in summary, ino:0, nid:6, max:1018"
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The vulnerable path is reached only by mounting a crafted f2fs image locally (mount \u2192 f2fs_fill_super \u2192 f2fs_recover_fsync_data \u2192 recover_data \u2192 check_index_in_prev_nodes, and GC\u0027s is_alive); there is no network or adjacent-protocol entry point.\nAC:L - The attacker fully controls the on-disk SSA summary ofs_in_node field, and a value such as 65286 (\u003e= ADDRS_PER_PAGE) deterministically triggers the out-of-range access on every mount with no race or uncontrollable memory layout required.\nPR:N - Authoring and delivering the malicious f2fs image requires no privileges on the target; mount privilege belongs to the victim or an automounter (Android vold, udisks2), matching the established crafted-image scoring pattern for f2fs.\nUI:R - f2fs lacks FS_USERNS_MOUNT so mounting needs CAP_SYS_ADMIN in the initial user namespace; exploitation therefore requires a victim (or automount daemon acting on inserted media) to mount the crafted image.\nS:U - The out-of-bounds page access and resulting memory corruption remain within the host kernel\u0027s security authority; this is not a VM escape, IOMMU bypass, or other cross-boundary impact.\nC:H - data_blkaddr/f2fs_data_blkaddr indexes addr_array[base+ofs_in_node] with an attacker-chosen u16 past the 4K node page (KASAN use-after-free/OOB read of size 4), enabling arbitrary adjacent kernel memory disclosure.\nI:H - When the OOB-read blkaddr matches, truncate_out calls f2fs_truncate_data_blocks_range \u2192 f2fs_set_data_blkaddr which writes NULL_ADDR at the unvalidated offset, yielding an out-of-bounds write/UAF primitive treated as high integrity impact.\nA:H - The same OOB/UAF access causes a kernel oops or panic (as in the original KASAN report on mount), fully denying availability and remaining repeatable on each mount of the crafted image."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T08:59:40.190Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/c99860f9a75079f339ed7670425b1ac58f26e2ff"
        },
        {
          "url": "https://git.kernel.org/stable/c/4a8e8bf280703e04e0b9d91f101e1fdd9a5bd09e"
        },
        {
          "url": "https://git.kernel.org/stable/c/73687c53919f49dff3852155621dab7a35c52854"
        },
        {
          "url": "https://git.kernel.org/stable/c/e168f819bfa42459b14f479e55ebd550bcc78899"
        },
        {
          "url": "https://git.kernel.org/stable/c/0922ad64ccefa3e483e84355942b86e13c8fea68"
        },
        {
          "url": "https://git.kernel.org/stable/c/c6ad7fd16657ebd34a87a97d9588195aae87597d"
        }
      ],
      "title": "f2fs: fix to do sanity check on summary info",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2022-50753",
    "datePublished": "2025-12-24T13:05:47.559Z",
    "dateReserved": "2025-12-24T13:02:21.544Z",
    "dateUpdated": "2026-08-05T08:59:40.190Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2022-50753",
      "date": "2026-09-27",
      "epss": "0.00203",
      "percentile": "0.09195"
    },
    "nvd": {
      "cve": {
        "affected": [
          {
            "affectedData": [
              {
                "defaultStatus": "unaffected",
                "product": "Linux",
                "programFiles": [
                  "fs/f2fs/gc.c",
                  "fs/f2fs/recovery.c"
                ],
                "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                "vendor": "Linux",
                "versions": [
                  {
                    "lessThan": "c99860f9a75079f339ed7670425b1ac58f26e2ff",
                    "status": "affected",
                    "version": "b292dcab068e141d8a820b77cbcc88d98c610eb4",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "4a8e8bf280703e04e0b9d91f101e1fdd9a5bd09e",
                    "status": "affected",
                    "version": "b292dcab068e141d8a820b77cbcc88d98c610eb4",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "73687c53919f49dff3852155621dab7a35c52854",
                    "status": "affected",
                    "version": "b292dcab068e141d8a820b77cbcc88d98c610eb4",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "e168f819bfa42459b14f479e55ebd550bcc78899",
                    "status": "affected",
                    "version": "b292dcab068e141d8a820b77cbcc88d98c610eb4",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "0922ad64ccefa3e483e84355942b86e13c8fea68",
                    "status": "affected",
                    "version": "b292dcab068e141d8a820b77cbcc88d98c610eb4",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "c6ad7fd16657ebd34a87a97d9588195aae87597d",
                    "status": "affected",
                    "version": "b292dcab068e141d8a820b77cbcc88d98c610eb4",
                    "versionType": "git"
                  }
                ]
              },
              {
                "defaultStatus": "affected",
                "product": "Linux",
                "programFiles": [
                  "fs/f2fs/gc.c",
                  "fs/f2fs/recovery.c"
                ],
                "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                "vendor": "Linux",
                "versions": [
                  {
                    "status": "affected",
                    "version": "3.11"
                  },
                  {
                    "lessThan": "3.11",
                    "status": "unaffected",
                    "version": "0",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "5.4.*",
                    "status": "unaffected",
                    "version": "5.4.220",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "5.10.*",
                    "status": "unaffected",
                    "version": "5.10.150",
                    "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"
                  }
                ]
              }
            ],
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
          }
        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nf2fs: fix to do sanity check on summary info\n\nAs Wenqing Liu reported in bugzilla:\n\nhttps://bugzilla.kernel.org/show_bug.cgi?id=216456\n\nBUG: KASAN: use-after-free in recover_data+0x63ae/0x6ae0 [f2fs]\nRead of size 4 at addr ffff8881464dcd80 by task mount/1013\n\nCPU: 3 PID: 1013 Comm: mount Tainted: G        W          6.0.0-rc4 #1\nHardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.15.0-1 04/01/2014\nCall Trace:\n dump_stack_lvl+0x45/0x5e\n print_report.cold+0xf3/0x68d\n kasan_report+0xa8/0x130\n recover_data+0x63ae/0x6ae0 [f2fs]\n f2fs_recover_fsync_data+0x120d/0x1fc0 [f2fs]\n f2fs_fill_super+0x4665/0x61e0 [f2fs]\n mount_bdev+0x2cf/0x3b0\n legacy_get_tree+0xed/0x1d0\n vfs_get_tree+0x81/0x2b0\n path_mount+0x47e/0x19d0\n do_mount+0xce/0xf0\n __x64_sys_mount+0x12c/0x1a0\n do_syscall_64+0x38/0x90\n entry_SYSCALL_64_after_hwframe+0x63/0xcd\n\nThe root cause is: in fuzzed image, SSA table is corrupted: ofs_in_node\nis larger than ADDRS_PER_PAGE(), result in out-of-range access on 4k-size\npage.\n\n- recover_data\n - do_recover_data\n  - check_index_in_prev_nodes\n   - f2fs_data_blkaddr\n\nThis patch adds sanity check on summary info in recovery and GC flow\nin where the flows rely on them.\n\nAfter patch:\n[   29.310883] F2FS-fs (loop0): Inconsistent ofs_in_node:65286 in summary, ino:0, nid:6, max:1018"
          }
        ],
        "id": "CVE-2022-50753",
        "lastModified": "2026-08-04T10:18:23.367",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "baseScore": 7.8,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "NONE",
                "scope": "UNCHANGED",
                "userInteraction": "REQUIRED",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 1.8,
              "impactScore": 5.9,
              "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
              "type": "Secondary"
            }
          ]
        },
        "published": "2025-12-24T13:16:02.033",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/0922ad64ccefa3e483e84355942b86e13c8fea68"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/4a8e8bf280703e04e0b9d91f101e1fdd9a5bd09e"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/73687c53919f49dff3852155621dab7a35c52854"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/c6ad7fd16657ebd34a87a97d9588195aae87597d"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/c99860f9a75079f339ed7670425b1ac58f26e2ff"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/e168f819bfa42459b14f479e55ebd550bcc78899"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Deferred"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Important",
      "current_release_date": "2026-08-20T12:52:48+00:00",
      "cve": "CVE-2022-50753",
      "id": "CVE-2022-50753",
      "initial_release_date": "2022-01-01T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: Linux kernel: F2FS use-after-free vulnerability leading to denial of service or arbitrary code execution",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2022/cve-2022-50753.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-01T01:23:47Z",
      "cve": "CVE-2022-50753",
      "id": "CVE-2022-50753",
      "initial_release_date": "2025-12-25T01:04:09Z",
      "product_status:known_affected": "121",
      "product_status:known_not_affected": "439",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2022-50753",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2022-50753.json",
      "version": "13"
    }
  }
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.





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.

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.



Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.