{
   "containers": {
      "cna": {
         "providerMetadata": {
            "orgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038"
         },
         "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."
            }
         ],
         "affected": [
            {
               "product": "Linux",
               "vendor": "Linux",
               "defaultStatus": "unaffected",
               "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
               "programFiles": [
                  "include/net/dst_metadata.h"
               ],
               "versions": [
                  {
                     "version": "fc4099f17240",
                     "lessThan": "4ac84498fbe8",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "fc4099f17240",
                     "lessThan": "c1ff27d100e2",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "fc4099f17240",
                     "lessThan": "0be943916d78",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "fc4099f17240",
                     "lessThan": "a80817adc2a4",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "fc4099f17240",
                     "lessThan": "00e6d6c3bc14",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "fc4099f17240",
                     "lessThan": "fdcb263fa5cd",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "fc4099f17240",
                     "lessThan": "8b1087b998e2",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "fc4099f17240",
                     "lessThan": "9eeabdf17fa0",
                     "status": "affected",
                     "versionType": "git"
                  }
               ]
            },
            {
               "product": "Linux",
               "vendor": "Linux",
               "defaultStatus": "affected",
               "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
               "programFiles": [
                  "include/net/dst_metadata.h"
               ],
               "versions": [
                  {
                     "version": "4.3",
                     "status": "affected"
                  },
                  {
                     "version": "0",
                     "lessThan": "4.3",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "4.9.302",
                     "lessThanOrEqual": "4.9.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "4.14.267",
                     "lessThanOrEqual": "4.14.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "4.19.230",
                     "lessThanOrEqual": "4.19.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "5.4.180",
                     "lessThanOrEqual": "5.4.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "5.10.101",
                     "lessThanOrEqual": "5.10.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "5.15.24",
                     "lessThanOrEqual": "5.15.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "5.16.10",
                     "lessThanOrEqual": "5.16.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "5.17",
                     "lessThanOrEqual": "*",
                     "status": "unaffected",
                     "versionType": "original_commit_for_fix"
                  }
               ]
            }
         ],
         "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-c9c4e1df01b2"
         }
      }
   },
   "cveMetadata": {
      "assignerOrgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038",
      "cveID": "CVE-2022-48809",
      "requesterUserId": "gregkh@kernel.org",
      "serial": "1",
      "state": "PUBLISHED"
   },
   "dataType": "CVE_RECORD",
   "dataVersion": "5.0"
}