CVE-2022-50655 (GCVE-0-2022-50655)

Vulnerability from cvelistv5 – Published: 2025-12-09 00:00 – Updated: 2025-12-23 13:30
VLAI?
Title
ppp: associate skb with a device at tx
Summary
In the Linux kernel, the following vulnerability has been resolved: ppp: associate skb with a device at tx Syzkaller triggered flow dissector warning with the following: r0 = openat$ppp(0xffffffffffffff9c, &(0x7f0000000000), 0xc0802, 0x0) ioctl$PPPIOCNEWUNIT(r0, 0xc004743e, &(0x7f00000000c0)) ioctl$PPPIOCSACTIVE(r0, 0x40107446, &(0x7f0000000240)={0x2, &(0x7f0000000180)=[{0x20, 0x0, 0x0, 0xfffff034}, {0x6}]}) pwritev(r0, &(0x7f0000000040)=[{&(0x7f0000000140)='\x00!', 0x2}], 0x1, 0x0, 0x0) [ 9.485814] WARNING: CPU: 3 PID: 329 at net/core/flow_dissector.c:1016 __skb_flow_dissect+0x1ee0/0x1fa0 [ 9.485929] skb_get_poff+0x53/0xa0 [ 9.485937] bpf_skb_get_pay_offset+0xe/0x20 [ 9.485944] ? ppp_send_frame+0xc2/0x5b0 [ 9.485949] ? _raw_spin_unlock_irqrestore+0x40/0x60 [ 9.485958] ? __ppp_xmit_process+0x7a/0xe0 [ 9.485968] ? ppp_xmit_process+0x5b/0xb0 [ 9.485974] ? ppp_write+0x12a/0x190 [ 9.485981] ? do_iter_write+0x18e/0x2d0 [ 9.485987] ? __import_iovec+0x30/0x130 [ 9.485997] ? do_pwritev+0x1b6/0x240 [ 9.486016] ? trace_hardirqs_on+0x47/0x50 [ 9.486023] ? __x64_sys_pwritev+0x24/0x30 [ 9.486026] ? do_syscall_64+0x3d/0x80 [ 9.486031] ? entry_SYSCALL_64_after_hwframe+0x63/0xcd Flow dissector tries to find skb net namespace either via device or via socket. Neigher is set in ppp_send_frame, so let's manually use ppp->dev.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: d58e468b1112dcd1d5193c0a89ff9f98b5a3e8b9 , < 7da524781c531ebaf2f94c9dc4c541b82edecfed (git)
Affected: d58e468b1112dcd1d5193c0a89ff9f98b5a3e8b9 , < 148dcbd3af039ae39c3af697a3183008c7995805 (git)
Affected: d58e468b1112dcd1d5193c0a89ff9f98b5a3e8b9 , < 4b8f3b939266c90f03b7cc7e26a4c28c7b64137b (git)
Affected: d58e468b1112dcd1d5193c0a89ff9f98b5a3e8b9 , < 18dc946360bfe0de016a59e3cc3ee1f450fceb9d (git)
Affected: d58e468b1112dcd1d5193c0a89ff9f98b5a3e8b9 , < ee678b1f52f9439e930db2db3fd7e345d03e1a50 (git)
Affected: d58e468b1112dcd1d5193c0a89ff9f98b5a3e8b9 , < 9f225444467b98579cf28d94f4ad053460dfdb84 (git)
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    Linux Linux Affected: 4.20
Unaffected: 0 , < 4.20 (semver)
Unaffected: 5.4.229 , ≤ 5.4.* (semver)
Unaffected: 5.10.163 , ≤ 5.10.* (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)
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/ppp/ppp_generic.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "7da524781c531ebaf2f94c9dc4c541b82edecfed",
              "status": "affected",
              "version": "d58e468b1112dcd1d5193c0a89ff9f98b5a3e8b9",
              "versionType": "git"
            },
            {
              "lessThan": "148dcbd3af039ae39c3af697a3183008c7995805",
              "status": "affected",
              "version": "d58e468b1112dcd1d5193c0a89ff9f98b5a3e8b9",
              "versionType": "git"
            },
            {
              "lessThan": "4b8f3b939266c90f03b7cc7e26a4c28c7b64137b",
              "status": "affected",
              "version": "d58e468b1112dcd1d5193c0a89ff9f98b5a3e8b9",
              "versionType": "git"
            },
            {
              "lessThan": "18dc946360bfe0de016a59e3cc3ee1f450fceb9d",
              "status": "affected",
              "version": "d58e468b1112dcd1d5193c0a89ff9f98b5a3e8b9",
              "versionType": "git"
            },
            {
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              "status": "affected",
              "version": "d58e468b1112dcd1d5193c0a89ff9f98b5a3e8b9",
              "versionType": "git"
            },
            {
              "lessThan": "9f225444467b98579cf28d94f4ad053460dfdb84",
              "status": "affected",
              "version": "d58e468b1112dcd1d5193c0a89ff9f98b5a3e8b9",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/ppp/ppp_generic.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.20"
            },
            {
              "lessThan": "4.20",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.4.*",
              "status": "unaffected",
              "version": "5.4.229",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.163",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.86",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.0.*",
              "status": "unaffected",
              "version": "6.0.16",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.2",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.4.229",
                  "versionStartIncluding": "4.20",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.163",
                  "versionStartIncluding": "4.20",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.86",
                  "versionStartIncluding": "4.20",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.0.16",
                  "versionStartIncluding": "4.20",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.2",
                  "versionStartIncluding": "4.20",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.2",
                  "versionStartIncluding": "4.20",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nppp: associate skb with a device at tx\n\nSyzkaller triggered flow dissector warning with the following:\n\nr0 = openat$ppp(0xffffffffffffff9c, \u0026(0x7f0000000000), 0xc0802, 0x0)\nioctl$PPPIOCNEWUNIT(r0, 0xc004743e, \u0026(0x7f00000000c0))\nioctl$PPPIOCSACTIVE(r0, 0x40107446, \u0026(0x7f0000000240)={0x2, \u0026(0x7f0000000180)=[{0x20, 0x0, 0x0, 0xfffff034}, {0x6}]})\npwritev(r0, \u0026(0x7f0000000040)=[{\u0026(0x7f0000000140)=\u0027\\x00!\u0027, 0x2}], 0x1, 0x0, 0x0)\n\n[    9.485814] WARNING: CPU: 3 PID: 329 at net/core/flow_dissector.c:1016 __skb_flow_dissect+0x1ee0/0x1fa0\n[    9.485929]  skb_get_poff+0x53/0xa0\n[    9.485937]  bpf_skb_get_pay_offset+0xe/0x20\n[    9.485944]  ? ppp_send_frame+0xc2/0x5b0\n[    9.485949]  ? _raw_spin_unlock_irqrestore+0x40/0x60\n[    9.485958]  ? __ppp_xmit_process+0x7a/0xe0\n[    9.485968]  ? ppp_xmit_process+0x5b/0xb0\n[    9.485974]  ? ppp_write+0x12a/0x190\n[    9.485981]  ? do_iter_write+0x18e/0x2d0\n[    9.485987]  ? __import_iovec+0x30/0x130\n[    9.485997]  ? do_pwritev+0x1b6/0x240\n[    9.486016]  ? trace_hardirqs_on+0x47/0x50\n[    9.486023]  ? __x64_sys_pwritev+0x24/0x30\n[    9.486026]  ? do_syscall_64+0x3d/0x80\n[    9.486031]  ? entry_SYSCALL_64_after_hwframe+0x63/0xcd\n\nFlow dissector tries to find skb net namespace either via device\nor via socket. Neigher is set in ppp_send_frame, so let\u0027s manually\nuse ppp-\u003edev."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-12-23T13:30:27.480Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/7da524781c531ebaf2f94c9dc4c541b82edecfed"
        },
        {
          "url": "https://git.kernel.org/stable/c/148dcbd3af039ae39c3af697a3183008c7995805"
        },
        {
          "url": "https://git.kernel.org/stable/c/4b8f3b939266c90f03b7cc7e26a4c28c7b64137b"
        },
        {
          "url": "https://git.kernel.org/stable/c/18dc946360bfe0de016a59e3cc3ee1f450fceb9d"
        },
        {
          "url": "https://git.kernel.org/stable/c/ee678b1f52f9439e930db2db3fd7e345d03e1a50"
        },
        {
          "url": "https://git.kernel.org/stable/c/9f225444467b98579cf28d94f4ad053460dfdb84"
        }
      ],
      "title": "ppp: associate skb with a device at tx",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2022-50655",
    "datePublished": "2025-12-09T00:00:30.337Z",
    "dateReserved": "2025-12-08T23:57:43.372Z",
    "dateUpdated": "2025-12-23T13:30:27.480Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2022-50655\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-12-09T01:16:48.460\",\"lastModified\":\"2025-12-23T14:16:39.583\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nppp: associate skb with a device at tx\\n\\nSyzkaller triggered flow dissector warning with the following:\\n\\nr0 = openat$ppp(0xffffffffffffff9c, \u0026(0x7f0000000000), 0xc0802, 0x0)\\nioctl$PPPIOCNEWUNIT(r0, 0xc004743e, \u0026(0x7f00000000c0))\\nioctl$PPPIOCSACTIVE(r0, 0x40107446, \u0026(0x7f0000000240)={0x2, \u0026(0x7f0000000180)=[{0x20, 0x0, 0x0, 0xfffff034}, {0x6}]})\\npwritev(r0, \u0026(0x7f0000000040)=[{\u0026(0x7f0000000140)=\u0027\\\\x00!\u0027, 0x2}], 0x1, 0x0, 0x0)\\n\\n[    9.485814] WARNING: CPU: 3 PID: 329 at net/core/flow_dissector.c:1016 __skb_flow_dissect+0x1ee0/0x1fa0\\n[    9.485929]  skb_get_poff+0x53/0xa0\\n[    9.485937]  bpf_skb_get_pay_offset+0xe/0x20\\n[    9.485944]  ? ppp_send_frame+0xc2/0x5b0\\n[    9.485949]  ? _raw_spin_unlock_irqrestore+0x40/0x60\\n[    9.485958]  ? __ppp_xmit_process+0x7a/0xe0\\n[    9.485968]  ? ppp_xmit_process+0x5b/0xb0\\n[    9.485974]  ? ppp_write+0x12a/0x190\\n[    9.485981]  ? do_iter_write+0x18e/0x2d0\\n[    9.485987]  ? __import_iovec+0x30/0x130\\n[    9.485997]  ? do_pwritev+0x1b6/0x240\\n[    9.486016]  ? trace_hardirqs_on+0x47/0x50\\n[    9.486023]  ? __x64_sys_pwritev+0x24/0x30\\n[    9.486026]  ? do_syscall_64+0x3d/0x80\\n[    9.486031]  ? entry_SYSCALL_64_after_hwframe+0x63/0xcd\\n\\nFlow dissector tries to find skb net namespace either via device\\nor via socket. Neigher is set in ppp_send_frame, so let\u0027s manually\\nuse ppp-\u003edev.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/148dcbd3af039ae39c3af697a3183008c7995805\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/18dc946360bfe0de016a59e3cc3ee1f450fceb9d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/4b8f3b939266c90f03b7cc7e26a4c28c7b64137b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/7da524781c531ebaf2f94c9dc4c541b82edecfed\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/9f225444467b98579cf28d94f4ad053460dfdb84\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ee678b1f52f9439e930db2db3fd7e345d03e1a50\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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  • 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.
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