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CVE-2022-49307 (GCVE-0-2022-49307)

Vulnerability from cvelistv5 – Published: 2025-02-26 02:10 – Updated: 2026-05-11 18:57
VLAI
Title
tty: synclink_gt: Fix null-pointer-dereference in slgt_clean()
Summary
In the Linux kernel, the following vulnerability has been resolved: tty: synclink_gt: Fix null-pointer-dereference in slgt_clean() When the driver fails at alloc_hdlcdev(), and then we remove the driver module, we will get the following splat: [ 25.065966] general protection fault, probably for non-canonical address 0xdffffc0000000182: 0000 [#1] PREEMPT SMP KASAN PTI [ 25.066914] KASAN: null-ptr-deref in range [0x0000000000000c10-0x0000000000000c17] [ 25.069262] RIP: 0010:detach_hdlc_protocol+0x2a/0x3e0 [ 25.077709] Call Trace: [ 25.077924] <TASK> [ 25.078108] unregister_hdlc_device+0x16/0x30 [ 25.078481] slgt_cleanup+0x157/0x9f0 [synclink_gt] Fix this by checking whether the 'info->netdev' is a null pointer first.
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-10-01 19:44 UTC
CWE
  • CWE-476 - NULL Pointer Dereference
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 705b6c7b34f2621f95f606d0e683daa10cdb8eb9 , < 50c341f9a2adc4c32a8ad5a39eb99d9c4a419e0d (git)
Affected: 705b6c7b34f2621f95f606d0e683daa10cdb8eb9 , < 078212ad15dbd88840c82c97f12c93d83703c8fd (git)
Affected: 705b6c7b34f2621f95f606d0e683daa10cdb8eb9 , < ba08cbc5b53e151d0acf1930fb526fc65b7f3e65 (git)
Affected: 705b6c7b34f2621f95f606d0e683daa10cdb8eb9 , < f6e07eb7ebec53ffe81fc2489589320fbe4a6b75 (git)
Affected: 705b6c7b34f2621f95f606d0e683daa10cdb8eb9 , < d68d5e68b7f64de7170f8e04dd9b995c36b2c71c (git)
Affected: 705b6c7b34f2621f95f606d0e683daa10cdb8eb9 , < 8a95696bdc0e13f8980f05b54a3b9081963d1256 (git)
Affected: 705b6c7b34f2621f95f606d0e683daa10cdb8eb9 , < ddd67751ab86c6a65f95c35293c42f85a42ac05d (git)
Affected: 705b6c7b34f2621f95f606d0e683daa10cdb8eb9 , < 1ceb4ca9543a8a788febf6bc8dad2e605e172d5e (git)
Affected: 705b6c7b34f2621f95f606d0e683daa10cdb8eb9 , < 689ca31c542687709ba21ec2195c1fbce34fd029 (git)
guessed Create a notification for this product.
Linux Linux Affected: 2.6.16
Unaffected: 0 , < 2.6.16 (semver)
Unaffected: 4.9.318 , ≤ 4.9.* (semver)
Unaffected: 4.14.283 , ≤ 4.14.* (semver)
Unaffected: 4.19.247 , ≤ 4.19.* (semver)
Unaffected: 5.4.198 , ≤ 5.4.* (semver)
Unaffected: 5.10.122 , ≤ 5.10.* (semver)
Unaffected: 5.15.47 , ≤ 5.15.* (semver)
Unaffected: 5.17.15 , ≤ 5.17.* (semver)
Unaffected: 5.18.4 , ≤ 5.18.* (semver)
Unaffected: 5.19 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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                    "versionStartIncluding": "5.16",
                    "vulnerable": true
                  },
                  {
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                    "matchCriteriaId": "FA6D643C-6D6A-4821-8A8D-B5776B8F0103",
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                ],
                "negate": false,
                "operator": "OR"
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            ]
          }
        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntty: synclink_gt: Fix null-pointer-dereference in slgt_clean()\n\nWhen the driver fails at alloc_hdlcdev(), and then we remove the driver\nmodule, we will get the following splat:\n\n[   25.065966] general protection fault, probably for non-canonical address 0xdffffc0000000182: 0000 [#1] PREEMPT SMP KASAN PTI\n[   25.066914] KASAN: null-ptr-deref in range [0x0000000000000c10-0x0000000000000c17]\n[   25.069262] RIP: 0010:detach_hdlc_protocol+0x2a/0x3e0\n[   25.077709] Call Trace:\n[   25.077924]  \u003cTASK\u003e\n[   25.078108]  unregister_hdlc_device+0x16/0x30\n[   25.078481]  slgt_cleanup+0x157/0x9f0 [synclink_gt]\n\nFix this by checking whether the \u0027info-\u003enetdev\u0027 is a null pointer first."
          },
          {
            "lang": "es",
            "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: tty: synclink_gt: Fix null-pointer-dereference in slgt_clean() Cuando el controlador falla en alloc_hdlcdev() y luego eliminamos el m\u00f3dulo del controlador, obtendremos el siguiente splat: [ 25.065966] error de protecci\u00f3n general, probablemente para la direcci\u00f3n no can\u00f3nica 0xdffffc0000000182: 0000 [#1] PREEMPT SMP KASAN PTI [ 25.066914] KASAN: null-ptr-deref en el rango [0x000000000000c10-0x0000000000000c17] [ 25.069262] RIP: 0010:detach_hdlc_protocol+0x2a/0x3e0 [ 25.077709] Seguimiento de llamadas: [ 25.077924]  [ 25.078108] unregister_hdlc_device+0x16/0x30 [ 25.078481] slgt_cleanup+0x157/0x9f0 [synclink_gt] Solucione esto comprobando primero si \u0027info-\u0026gt;netdev\u0027 es un puntero nulo."
          }
        ],
        "id": "CVE-2022-49307",
        "lastModified": "2026-06-17T05:17:40.053",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
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                "attackVector": "LOCAL",
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                "baseScore": 5.5,
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                "confidentialityImpact": "NONE",
                "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"
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              "impactScore": 3.6,
              "source": "nvd@nist.gov",
              "type": "Primary"
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                "baseScore": 5.5,
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                "integrityImpact": "NONE",
                "privilegesRequired": "LOW",
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                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
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              "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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                "timestamp": "2025-10-01T19:44:25.712102Z",
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        "published": "2025-02-26T07:01:07.503",
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        "vulnStatus": "Modified",
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                "value": "CWE-476"
              }
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            "source": "nvd@nist.gov",
            "type": "Primary"
          },
          {
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              }
            ],
            "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
            "type": "Secondary"
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    },
    "redhat_vex": {
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      "current_release_date": "2026-06-29T21:04:42+00:00",
      "cve": "CVE-2022-49307",
      "id": "CVE-2022-49307",
      "initial_release_date": "2022-01-01T00:00:00+00:00",
      "product_status:known_affected": "184",
      "product_status:known_not_affected": "90",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: tty: synclink_gt: Fix null-pointer-dereference in slgt_clean()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2022/cve-2022-49307.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-05T17:06:50Z",
      "cve": "CVE-2022-49307",
      "id": "CVE-2022-49307",
      "initial_release_date": "2025-02-27T03:09:04Z",
      "product_status:known_affected": "340",
      "product_status:known_not_affected": "365",
      "product_status:recommended": "293",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2022-49307",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2022-49307.json",
      "version": "49"
    },
    "vulnrichment": {
      "containers": {
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                  "baseSeverity": "MEDIUM",
                  "confidentialityImpact": "NONE",
                  "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"
                }
              },
              {
                "other": {
                  "content": {
                    "id": "CVE-2022-49307",
                    "options": [
                      {
                        "Exploitation": "none"
                      },
                      {
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                      },
                      {
                        "Technical Impact": "partial"
                      }
                    ],
                    "role": "CISA Coordinator",
                    "timestamp": "2025-10-01T19:44:25.712102Z",
                    "version": "2.0.3"
                  },
                  "type": "ssvc"
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              }
            ],
            "problemTypes": [
              {
                "descriptions": [
                  {
                    "cweId": "CWE-476",
                    "description": "CWE-476 NULL Pointer Dereference",
                    "lang": "en",
                    "type": "CWE"
                  }
                ]
              }
            ],
            "providerMetadata": {
              "dateUpdated": "2025-10-01T16:13:59.199Z",
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "title": "CISA ADP Vulnrichment"
          }
        ],
        "cna": {
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              "product": "Linux",
              "programFiles": [
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              "product": "Linux",
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              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "vendor": "Linux",
              "versions": [
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                  "version": "2.6.16"
                },
                {
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                  "status": "unaffected",
                  "version": "0",
                  "versionType": "semver"
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                {
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                  "status": "unaffected",
                  "version": "4.9.318",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "4.14.*",
                  "status": "unaffected",
                  "version": "4.14.283",
                  "versionType": "semver"
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                {
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                  "status": "unaffected",
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                  "versionType": "semver"
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                {
                  "lessThanOrEqual": "5.4.*",
                  "status": "unaffected",
                  "version": "5.4.198",
                  "versionType": "semver"
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                {
                  "lessThanOrEqual": "5.10.*",
                  "status": "unaffected",
                  "version": "5.10.122",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "5.15.*",
                  "status": "unaffected",
                  "version": "5.15.47",
                  "versionType": "semver"
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                {
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                },
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                  "version": "5.18.4",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "*",
                  "status": "unaffected",
                  "version": "5.19",
                  "versionType": "original_commit_for_fix"
                }
              ]
            }
          ],
          "cpeApplicability": [
            {
              "nodes": [
                {
                  "cpeMatch": [
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                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "4.9.318",
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                    {
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              "lang": "en",
              "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntty: synclink_gt: Fix null-pointer-dereference in slgt_clean()\n\nWhen the driver fails at alloc_hdlcdev(), and then we remove the driver\nmodule, we will get the following splat:\n\n[   25.065966] general protection fault, probably for non-canonical address 0xdffffc0000000182: 0000 [#1] PREEMPT SMP KASAN PTI\n[   25.066914] KASAN: null-ptr-deref in range [0x0000000000000c10-0x0000000000000c17]\n[   25.069262] RIP: 0010:detach_hdlc_protocol+0x2a/0x3e0\n[   25.077709] Call Trace:\n[   25.077924]  \u003cTASK\u003e\n[   25.078108]  unregister_hdlc_device+0x16/0x30\n[   25.078481]  slgt_cleanup+0x157/0x9f0 [synclink_gt]\n\nFix this by checking whether the \u0027info-\u003enetdev\u0027 is a null pointer first."
            }
          ],
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            "dateUpdated": "2026-05-11T18:57:09.382Z",
            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "shortName": "Linux"
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          "references": [
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            {
              "url": "https://git.kernel.org/stable/c/078212ad15dbd88840c82c97f12c93d83703c8fd"
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            },
            {
              "url": "https://git.kernel.org/stable/c/689ca31c542687709ba21ec2195c1fbce34fd029"
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        "assignerShortName": "Linux",
        "cveId": "CVE-2022-49307",
        "datePublished": "2025-02-26T02:10:39.151Z",
        "dateReserved": "2025-02-26T02:08:31.535Z",
        "dateUpdated": "2026-05-11T18:57:09.382Z",
        "state": "PUBLISHED"
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    }
  }
}



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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.


Detection rules are retrieved from Rulezet.


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.