CVE-2022-48809 (GCVE-0-2022-48809)

Vulnerability from cvelistv5 – Published: 2024-07-16 11:43 – Updated: 2026-05-11 18:47
VLAI
Title
net: fix a memleak when uncloning an skb dst and its metadata
Summary
In the Linux kernel, the following vulnerability has been resolved: net: fix a memleak when uncloning an skb dst and its metadata When uncloning an skb dst and its associated metadata, a new dst+metadata is allocated and later replaces the old one in the skb. This is helpful to have a non-shared dst+metadata attached to a specific skb. The issue is the uncloned dst+metadata is initialized with a refcount of 1, which is increased to 2 before attaching it to the skb. When tun_dst_unclone returns, the dst+metadata is only referenced from a single place (the skb) while its refcount is 2. Its refcount will never drop to 0 (when the skb is consumed), leading to a memory leak. Fix this by removing the call to dst_hold in tun_dst_unclone, as the dst+metadata refcount is already 1.
Severity
No CVSS data available.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-09-10 16:58 UTC
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6848 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: fc4099f17240767554ff3a73977acb78ef615404 , < 4ac84498fbe84a00e7aef185e2bb3e40ce71eca4 (git)
Affected: fc4099f17240767554ff3a73977acb78ef615404 , < c1ff27d100e2670b03cbfddb9117e5f9fc672540 (git)
Affected: fc4099f17240767554ff3a73977acb78ef615404 , < 0be943916d781df2b652793bb2d3ae4f9624c10a (git)
Affected: fc4099f17240767554ff3a73977acb78ef615404 , < a80817adc2a4c1ba26a7aa5f3ed886e4a18dff88 (git)
Affected: fc4099f17240767554ff3a73977acb78ef615404 , < 00e6d6c3bc14dfe32824e2c515f0e0f2d6ecf2f1 (git)
Affected: fc4099f17240767554ff3a73977acb78ef615404 , < fdcb263fa5cda15b8cb24a641fa2718c47605314 (git)
Affected: fc4099f17240767554ff3a73977acb78ef615404 , < 8b1087b998e273f07be13dcb5f3ca4c309c7f108 (git)
Affected: fc4099f17240767554ff3a73977acb78ef615404 , < 9eeabdf17fa0ab75381045c867c370f4cc75a613 (git)
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Linux Linux Affected: 4.3
Unaffected: 0 , < 4.3 (semver)
Unaffected: 4.9.302 , ≤ 4.9.* (semver)
Unaffected: 4.14.267 , ≤ 4.14.* (semver)
Unaffected: 4.19.230 , ≤ 4.19.* (semver)
Unaffected: 5.4.180 , ≤ 5.4.* (semver)
Unaffected: 5.10.101 , ≤ 5.10.* (semver)
Unaffected: 5.15.24 , ≤ 5.15.* (semver)
Unaffected: 5.16.10 , ≤ 5.16.* (semver)
Unaffected: 5.17 , ≤ * (original_commit_for_fix)
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                  "version": "fc4099f17240767554ff3a73977acb78ef615404",
                  "versionType": "git"
                },
                {
                  "lessThan": "8b1087b998e273f07be13dcb5f3ca4c309c7f108",
                  "status": "affected",
                  "version": "fc4099f17240767554ff3a73977acb78ef615404",
                  "versionType": "git"
                },
                {
                  "lessThan": "9eeabdf17fa0ab75381045c867c370f4cc75a613",
                  "status": "affected",
                  "version": "fc4099f17240767554ff3a73977acb78ef615404",
                  "versionType": "git"
                }
              ]
            },
            {
              "defaultStatus": "affected",
              "product": "Linux",
              "programFiles": [
                "include/net/dst_metadata.h"
              ],
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "vendor": "Linux",
              "versions": [
                {
                  "status": "affected",
                  "version": "4.3"
                },
                {
                  "lessThan": "4.3",
                  "status": "unaffected",
                  "version": "0",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "4.9.*",
                  "status": "unaffected",
                  "version": "4.9.302",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "4.14.*",
                  "status": "unaffected",
                  "version": "4.14.267",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "4.19.*",
                  "status": "unaffected",
                  "version": "4.19.230",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "5.4.*",
                  "status": "unaffected",
                  "version": "5.4.180",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "5.10.*",
                  "status": "unaffected",
                  "version": "5.10.101",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "5.15.*",
                  "status": "unaffected",
                  "version": "5.15.24",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "5.16.*",
                  "status": "unaffected",
                  "version": "5.16.10",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "*",
                  "status": "unaffected",
                  "version": "5.17",
                  "versionType": "original_commit_for_fix"
                }
              ]
            }
          ],
          "cpeApplicability": [
            {
              "nodes": [
                {
                  "cpeMatch": [
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "4.9.302",
                      "versionStartIncluding": "4.3",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "4.14.267",
                      "versionStartIncluding": "4.3",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "4.19.230",
                      "versionStartIncluding": "4.3",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.4.180",
                      "versionStartIncluding": "4.3",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.10.101",
                      "versionStartIncluding": "4.3",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.15.24",
                      "versionStartIncluding": "4.3",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.16.10",
                      "versionStartIncluding": "4.3",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.17",
                      "versionStartIncluding": "4.3",
                      "vulnerable": true
                    }
                  ],
                  "negate": false,
                  "operator": "OR"
                }
              ]
            }
          ],
          "descriptions": [
            {
              "lang": "en",
              "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: fix a memleak when uncloning an skb dst and its metadata\n\nWhen uncloning an skb dst and its associated metadata, a new\ndst+metadata is allocated and later replaces the old one in the skb.\nThis is helpful to have a non-shared dst+metadata attached to a specific\nskb.\n\nThe issue is the uncloned dst+metadata is initialized with a refcount of\n1, which is increased to 2 before attaching it to the skb. When\ntun_dst_unclone returns, the dst+metadata is only referenced from a\nsingle place (the skb) while its refcount is 2. Its refcount will never\ndrop to 0 (when the skb is consumed), leading to a memory leak.\n\nFix this by removing the call to dst_hold in tun_dst_unclone, as the\ndst+metadata refcount is already 1."
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2025-05-04T08:23:32.834Z",
            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "shortName": "Linux"
          },
          "references": [
            {
              "url": "https://git.kernel.org/stable/c/4ac84498fbe84a00e7aef185e2bb3e40ce71eca4"
            },
            {
              "url": "https://git.kernel.org/stable/c/c1ff27d100e2670b03cbfddb9117e5f9fc672540"
            },
            {
              "url": "https://git.kernel.org/stable/c/0be943916d781df2b652793bb2d3ae4f9624c10a"
            },
            {
              "url": "https://git.kernel.org/stable/c/a80817adc2a4c1ba26a7aa5f3ed886e4a18dff88"
            },
            {
              "url": "https://git.kernel.org/stable/c/00e6d6c3bc14dfe32824e2c515f0e0f2d6ecf2f1"
            },
            {
              "url": "https://git.kernel.org/stable/c/fdcb263fa5cda15b8cb24a641fa2718c47605314"
            },
            {
              "url": "https://git.kernel.org/stable/c/8b1087b998e273f07be13dcb5f3ca4c309c7f108"
            },
            {
              "url": "https://git.kernel.org/stable/c/9eeabdf17fa0ab75381045c867c370f4cc75a613"
            }
          ],
          "title": "net: fix a memleak when uncloning an skb dst and its metadata",
          "x_generator": {
            "engine": "bippy-1.2.0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "assignerShortName": "Linux",
        "cveId": "CVE-2022-48809",
        "datePublished": "2024-07-16T11:43:59.757Z",
        "dateReserved": "2024-07-16T11:38:08.897Z",
        "dateUpdated": "2025-05-04T08:23:32.834Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}



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Sightings

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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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