CVE-2022-50335 (GCVE-0-2022-50335)

Vulnerability from cvelistv5 – Published: 2025-09-15 14:49 – Updated: 2026-08-05 08:58
VLAI
Title
9p: set req refcount to zero to avoid uninitialized usage
Summary
In the Linux kernel, the following vulnerability has been resolved: 9p: set req refcount to zero to avoid uninitialized usage When a new request is allocated, the refcount will be zero if it is reused, but if the request is newly allocated from slab, it is not fully initialized before being added to idr. If the p9_read_work got a response before the refcount initiated. It will use a uninitialized req, which will result in a bad request data struct. Here is the logs from syzbot. Corrupted memory at 0xffff88807eade00b [ 0xff 0x07 0x00 0x00 0x00 0x00 0x00 0x00 . . . . . . . . ] (in kfence-#110): p9_fcall_fini net/9p/client.c:248 [inline] p9_req_put net/9p/client.c:396 [inline] p9_req_put+0x208/0x250 net/9p/client.c:390 p9_client_walk+0x247/0x540 net/9p/client.c:1165 clone_fid fs/9p/fid.h:21 [inline] v9fs_fid_xattr_set+0xe4/0x2b0 fs/9p/xattr.c:118 v9fs_xattr_set fs/9p/xattr.c:100 [inline] v9fs_xattr_handler_set+0x6f/0x120 fs/9p/xattr.c:159 __vfs_setxattr+0x119/0x180 fs/xattr.c:182 __vfs_setxattr_noperm+0x129/0x5f0 fs/xattr.c:216 __vfs_setxattr_locked+0x1d3/0x260 fs/xattr.c:277 vfs_setxattr+0x143/0x340 fs/xattr.c:309 setxattr+0x146/0x160 fs/xattr.c:617 path_setxattr+0x197/0x1c0 fs/xattr.c:636 __do_sys_setxattr fs/xattr.c:652 [inline] __se_sys_setxattr fs/xattr.c:648 [inline] __ia32_sys_setxattr+0xc0/0x160 fs/xattr.c:648 do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline] __do_fast_syscall_32+0x65/0xf0 arch/x86/entry/common.c:178 do_fast_syscall_32+0x33/0x70 arch/x86/entry/common.c:203 entry_SYSENTER_compat_after_hwframe+0x70/0x82 Below is a similar scenario, the scenario in the syzbot log looks more complicated than this one, but this patch can fix it. T21124 p9_read_work ======================== second trans ================================= p9_client_walk p9_client_rpc p9_client_prepare_req p9_tag_alloc req = kmem_cache_alloc(p9_req_cache, GFP_NOFS); tag = idr_alloc << preempted >> req->tc.tag = tag; /* req->[refcount/tag] == uninitialized */ m->rreq = p9_tag_lookup(m->client, m->rc.tag); /* increments uninitalized refcount */ refcount_set(&req->refcount, 2); /* cb drops one ref */ p9_client_cb(req) /* reader thread drops its ref: request is incorrectly freed */ p9_req_put(req) /* use after free and ref underflow */ p9_req_put(req) To fix it, we can initialize the refcount to zero before add to idr.
Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6637 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 728356dedeff8ef999cb436c71333ef4ac51a81c , < 1cabce56626a61f4f02452cba61ad4332a4b73f8 (git)
Affected: 728356dedeff8ef999cb436c71333ef4ac51a81c , < 73c47b3123b351de2d3714a72a336c0f72f203af (git)
Affected: 728356dedeff8ef999cb436c71333ef4ac51a81c , < 967fc34f297e40fd2e068cf6b0c3eb4916228539 (git)
Affected: 728356dedeff8ef999cb436c71333ef4ac51a81c , < 26273ade77f54716e30dfd40ac6e85ceb54ac0f9 (git)
Affected: 3665a4d9dca1bd06bc34afb72e637fe01b2776ee (git)
Affected: 4.19.57 , < 4.20 (semver)
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Linux Linux Affected: 4.20
Unaffected: 0 , < 4.20 (semver)
Unaffected: 5.15.86 , ≤ 5.15.* (semver)
Unaffected: 6.0.16 , ≤ 6.0.* (semver)
Unaffected: 6.1.2 , ≤ 6.1.* (semver)
Unaffected: 6.2 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\n9p: set req refcount to zero to avoid uninitialized usage\n\nWhen a new request is allocated, the refcount will be zero if it is\nreused, but if the request is newly allocated from slab, it is not fully\ninitialized before being added to idr.\n\nIf the p9_read_work got a response before the refcount initiated. It will\nuse a uninitialized req, which will result in a bad request data struct.\n\nHere is the logs from syzbot.\n\nCorrupted memory at 0xffff88807eade00b [ 0xff 0x07 0x00 0x00 0x00 0x00\n0x00 0x00 . . . . . . . . ] (in kfence-#110):\n p9_fcall_fini net/9p/client.c:248 [inline]\n p9_req_put net/9p/client.c:396 [inline]\n p9_req_put+0x208/0x250 net/9p/client.c:390\n p9_client_walk+0x247/0x540 net/9p/client.c:1165\n clone_fid fs/9p/fid.h:21 [inline]\n v9fs_fid_xattr_set+0xe4/0x2b0 fs/9p/xattr.c:118\n v9fs_xattr_set fs/9p/xattr.c:100 [inline]\n v9fs_xattr_handler_set+0x6f/0x120 fs/9p/xattr.c:159\n __vfs_setxattr+0x119/0x180 fs/xattr.c:182\n __vfs_setxattr_noperm+0x129/0x5f0 fs/xattr.c:216\n __vfs_setxattr_locked+0x1d3/0x260 fs/xattr.c:277\n vfs_setxattr+0x143/0x340 fs/xattr.c:309\n setxattr+0x146/0x160 fs/xattr.c:617\n path_setxattr+0x197/0x1c0 fs/xattr.c:636\n __do_sys_setxattr fs/xattr.c:652 [inline]\n __se_sys_setxattr fs/xattr.c:648 [inline]\n __ia32_sys_setxattr+0xc0/0x160 fs/xattr.c:648\n do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline]\n __do_fast_syscall_32+0x65/0xf0 arch/x86/entry/common.c:178\n do_fast_syscall_32+0x33/0x70 arch/x86/entry/common.c:203\n entry_SYSENTER_compat_after_hwframe+0x70/0x82\n\nBelow is a similar scenario, the scenario in the syzbot log looks more\ncomplicated than this one, but this patch can fix it.\n\n     T21124                   p9_read_work\n======================== second trans =================================\np9_client_walk\n  p9_client_rpc\n    p9_client_prepare_req\n      p9_tag_alloc\n        req = kmem_cache_alloc(p9_req_cache, GFP_NOFS);\n        tag = idr_alloc\n        \u003c\u003c preempted \u003e\u003e\n        req-\u003etc.tag = tag;\n                            /* req-\u003e[refcount/tag] == uninitialized */\n                            m-\u003erreq = p9_tag_lookup(m-\u003eclient, m-\u003erc.tag);\n                              /* increments uninitalized refcount */\n\n        refcount_set(\u0026req-\u003erefcount, 2);\n                            /* cb drops one ref */\n                            p9_client_cb(req)\n                            /* reader thread drops its ref:\n                               request is incorrectly freed */\n                            p9_req_put(req)\n    /* use after free and ref underflow */\n    p9_req_put(req)\n\nTo fix it, we can initialize the refcount to zero before add to idr."
          }
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        "id": "CVE-2022-50335",
        "lastModified": "2026-08-04T10:18:11.623",
        "metrics": {
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                "integrityImpact": "NONE",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 1.8,
              "impactScore": 3.6,
              "source": "nvd@nist.gov",
              "type": "Primary"
            }
          ]
        },
        "published": "2025-09-15T15:15:45.817",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/1cabce56626a61f4f02452cba61ad4332a4b73f8"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/26273ade77f54716e30dfd40ac6e85ceb54ac0f9"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/73c47b3123b351de2d3714a72a336c0f72f203af"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/967fc34f297e40fd2e068cf6b0c3eb4916228539"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Modified",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-908"
              }
            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
          }
        ]
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-11-05T10:15:07+00:00",
      "cve": "CVE-2022-50335",
      "id": "CVE-2022-50335",
      "initial_release_date": "2022-01-01T00:00:00+00:00",
      "product_status:known_affected": "14",
      "product_status:known_not_affected": "186",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: 9p: set req refcount to zero to avoid uninitialized usage",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2022/cve-2022-50335.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-10-30T03:28:05Z",
      "cve": "CVE-2022-50335",
      "id": "CVE-2022-50335",
      "initial_release_date": "2025-09-15T23:28:55Z",
      "product_status:known_affected": "130",
      "product_status:known_not_affected": "390",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2022-50335",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/2025/cve-2022-50335.json",
      "version": "13"
    }
  }
}



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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.

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.