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
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7033 records in the last 180 days details
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)
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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)
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{
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          "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"
        }
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            "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"
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              "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."
            }
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        {
          "url": "https://git.kernel.org/stable/c/c6ad7fd16657ebd34a87a97d9588195aae87597d"
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      "title": "f2fs: fix to do sanity check on summary info",
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    "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"
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        "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"
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              "impactScore": 5.9,
              "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
              "type": "Secondary"
            }
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        },
        "published": "2025-12-24T13:16:02.033",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/0922ad64ccefa3e483e84355942b86e13c8fea68"
          },
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            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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          },
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            "url": "https://git.kernel.org/stable/c/c6ad7fd16657ebd34a87a97d9588195aae87597d"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/c99860f9a75079f339ed7670425b1ac58f26e2ff"
          },
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          }
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        "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"
    }
  }
}



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Taxonomy of the tags.




Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.

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.
Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

JSON
How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

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    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.