Vulnerability-Lookup

GHSA-556C-4MVG-6PQR

Vulnerability from github – Published: 2025-12-09 03:31 – Updated: 2025-12-09 03:31

Details

In the Linux kernel, the following vulnerability has been resolved:

io-wq: Fix memory leak in worker creation

If the CPU mask allocation for a node fails, then the memory allocated for the 'io_wqe' struct of the current node doesn't get freed on the error handling path, since it has not yet been added to the 'wqes' array.

This was spotted when fuzzing v6.1-rc1 with Syzkaller: BUG: memory leak unreferenced object 0xffff8880093d5000 (size 1024): comm "syz-executor.2", pid 7701, jiffies 4295048595 (age 13.900s) hex dump (first 32 bytes): 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ backtrace: [<00000000cb463369>] __kmem_cache_alloc_node+0x18e/0x720 [<00000000147a3f9c>] kmalloc_node_trace+0x2a/0x130 [<000000004e107011>] io_wq_create+0x7b9/0xdc0 [<00000000c38b2018>] io_uring_alloc_task_context+0x31e/0x59d [<00000000867399da>] __io_uring_add_tctx_node.cold+0x19/0x1ba [<000000007e0e7a79>] io_uring_setup.cold+0x1b80/0x1dce [<00000000b545e9f6>] __x64_sys_io_uring_setup+0x5d/0x80 [<000000008a8a7508>] do_syscall_64+0x5d/0x90 [<000000004ac08bec>] entry_SYSCALL_64_after_hwframe+0x63/0xcd

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{
  "affected": [],
  "aliases": [
    "CVE-2022-50639"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-12-09T01:16:46Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nio-wq: Fix memory leak in worker creation\n\nIf the CPU mask allocation for a node fails, then the memory allocated for\nthe \u0027io_wqe\u0027 struct of the current node doesn\u0027t get freed on the error\nhandling path, since it has not yet been added to the \u0027wqes\u0027 array.\n\nThis was spotted when fuzzing v6.1-rc1 with Syzkaller:\nBUG: memory leak\nunreferenced object 0xffff8880093d5000 (size 1024):\n  comm \"syz-executor.2\", pid 7701, jiffies 4295048595 (age 13.900s)\n  hex dump (first 32 bytes):\n    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................\n    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................\n  backtrace:\n    [\u003c00000000cb463369\u003e] __kmem_cache_alloc_node+0x18e/0x720\n    [\u003c00000000147a3f9c\u003e] kmalloc_node_trace+0x2a/0x130\n    [\u003c000000004e107011\u003e] io_wq_create+0x7b9/0xdc0\n    [\u003c00000000c38b2018\u003e] io_uring_alloc_task_context+0x31e/0x59d\n    [\u003c00000000867399da\u003e] __io_uring_add_tctx_node.cold+0x19/0x1ba\n    [\u003c000000007e0e7a79\u003e] io_uring_setup.cold+0x1b80/0x1dce\n    [\u003c00000000b545e9f6\u003e] __x64_sys_io_uring_setup+0x5d/0x80\n    [\u003c000000008a8a7508\u003e] do_syscall_64+0x5d/0x90\n    [\u003c000000004ac08bec\u003e] entry_SYSCALL_64_after_hwframe+0x63/0xcd",
  "id": "GHSA-556c-4mvg-6pqr",
  "modified": "2025-12-09T03:31:09Z",
  "published": "2025-12-09T03:31:09Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2022-50639"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/996d3efeb091c503afd3ee6b5e20eabf446fd955"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b6e2c54be37d5eb4f6666e6aa59cd0581c7ffc3c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ed981911a7c90a604f4a2bee908ab07e3b786aca"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2022-50639 (GCVE-0-2022-50639)

Vulnerability from cvelistv5 – Published: 2025-12-09 00:00 – Updated: 2025-12-09 00:00

Title

io-wq: Fix memory leak in worker creation

Summary

In the Linux kernel, the following vulnerability has been resolved: io-wq: Fix memory leak in worker creation If the CPU mask allocation for a node fails, then the memory allocated for the 'io_wqe' struct of the current node doesn't get freed on the error handling path, since it has not yet been added to the 'wqes' array. This was spotted when fuzzing v6.1-rc1 with Syzkaller: BUG: memory leak unreferenced object 0xffff8880093d5000 (size 1024): comm "syz-executor.2", pid 7701, jiffies 4295048595 (age 13.900s) hex dump (first 32 bytes): 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ backtrace: [<00000000cb463369>] __kmem_cache_alloc_node+0x18e/0x720 [<00000000147a3f9c>] kmalloc_node_trace+0x2a/0x130 [<000000004e107011>] io_wq_create+0x7b9/0xdc0 [<00000000c38b2018>] io_uring_alloc_task_context+0x31e/0x59d [<00000000867399da>] __io_uring_add_tctx_node.cold+0x19/0x1ba [<000000007e0e7a79>] io_uring_setup.cold+0x1b80/0x1dce [<00000000b545e9f6>] __x64_sys_io_uring_setup+0x5d/0x80 [<000000008a8a7508>] do_syscall_64+0x5d/0x90 [<000000004ac08bec>] entry_SYSCALL_64_after_hwframe+0x63/0xcd

Severity ?

No CVSS data available.

Assigner

Linux

References

URL

Tags

	https://git.kernel.org/stable/c/b6e2c54be37d5eb4f…
	https://git.kernel.org/stable/c/ed981911a7c90a604…
	https://git.kernel.org/stable/c/996d3efeb091c503a…

Impacted products

Vendor

Product

Version

Linux

Affected: 0e03496d1967abf1ebb151a24318c07d07f41f7f , < b6e2c54be37d5eb4f6666e6aa59cd0581c7ffc3c (git)
Affected: 0e03496d1967abf1ebb151a24318c07d07f41f7f , < ed981911a7c90a604f4a2bee908ab07e3b786aca (git)
Affected: 0e03496d1967abf1ebb151a24318c07d07f41f7f , < 996d3efeb091c503afd3ee6b5e20eabf446fd955 (git)

Linux

Affected: 5.14
Unaffected: 0 , < 5.14 (semver)
Unaffected: 5.15.75 , ≤ 5.15.* (semver)
Unaffected: 6.0.4 , ≤ 6.0.* (semver)
Unaffected: 6.1 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "io_uring/io-wq.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "b6e2c54be37d5eb4f6666e6aa59cd0581c7ffc3c",
              "status": "affected",
              "version": "0e03496d1967abf1ebb151a24318c07d07f41f7f",
              "versionType": "git"
            },
            {
              "lessThan": "ed981911a7c90a604f4a2bee908ab07e3b786aca",
              "status": "affected",
              "version": "0e03496d1967abf1ebb151a24318c07d07f41f7f",
              "versionType": "git"
            },
            {
              "lessThan": "996d3efeb091c503afd3ee6b5e20eabf446fd955",
              "status": "affected",
              "version": "0e03496d1967abf1ebb151a24318c07d07f41f7f",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "io_uring/io-wq.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.14"
            },
            {
              "lessThan": "5.14",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.75",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.0.*",
              "status": "unaffected",
              "version": "6.0.4",
              "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": "5.14",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.0.4",
                  "versionStartIncluding": "5.14",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1",
                  "versionStartIncluding": "5.14",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nio-wq: Fix memory leak in worker creation\n\nIf the CPU mask allocation for a node fails, then the memory allocated for\nthe \u0027io_wqe\u0027 struct of the current node doesn\u0027t get freed on the error\nhandling path, since it has not yet been added to the \u0027wqes\u0027 array.\n\nThis was spotted when fuzzing v6.1-rc1 with Syzkaller:\nBUG: memory leak\nunreferenced object 0xffff8880093d5000 (size 1024):\n  comm \"syz-executor.2\", pid 7701, jiffies 4295048595 (age 13.900s)\n  hex dump (first 32 bytes):\n    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................\n    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................\n  backtrace:\n    [\u003c00000000cb463369\u003e] __kmem_cache_alloc_node+0x18e/0x720\n    [\u003c00000000147a3f9c\u003e] kmalloc_node_trace+0x2a/0x130\n    [\u003c000000004e107011\u003e] io_wq_create+0x7b9/0xdc0\n    [\u003c00000000c38b2018\u003e] io_uring_alloc_task_context+0x31e/0x59d\n    [\u003c00000000867399da\u003e] __io_uring_add_tctx_node.cold+0x19/0x1ba\n    [\u003c000000007e0e7a79\u003e] io_uring_setup.cold+0x1b80/0x1dce\n    [\u003c00000000b545e9f6\u003e] __x64_sys_io_uring_setup+0x5d/0x80\n    [\u003c000000008a8a7508\u003e] do_syscall_64+0x5d/0x90\n    [\u003c000000004ac08bec\u003e] entry_SYSCALL_64_after_hwframe+0x63/0xcd"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-12-09T00:00:12.576Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/b6e2c54be37d5eb4f6666e6aa59cd0581c7ffc3c"
        },
        {
          "url": "https://git.kernel.org/stable/c/ed981911a7c90a604f4a2bee908ab07e3b786aca"
        },
        {
          "url": "https://git.kernel.org/stable/c/996d3efeb091c503afd3ee6b5e20eabf446fd955"
        }
      ],
      "title": "io-wq: Fix memory leak in worker creation",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2022-50639",
    "datePublished": "2025-12-09T00:00:12.576Z",
    "dateReserved": "2025-12-08T23:57:43.370Z",
    "dateUpdated": "2025-12-09T00:00:12.576Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date

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.

Action not permitted

GHSA-556C-4MVG-6PQR

CVE-2022-50639 (GCVE-0-2022-50639)

Tags

Sightings

Nomenclature