{
   "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: skbuff: add overflow debug check to pull/push helpers\n\nsyzbot managed to trigger following splat:\nBUG: KASAN: use-after-free in __skb_flow_dissect+0x4a3b/0x5e50\nRead of size 1 at addr ffff888208a4000e by task a.out/2313\n[..]\n  __skb_flow_dissect+0x4a3b/0x5e50\n  __skb_get_hash+0xb4/0x400\n  ip_tunnel_xmit+0x77e/0x26f0\n  ipip_tunnel_xmit+0x298/0x410\n  ..\n\nAnalysis shows that the skb has a valid ->head, but bogus ->data\npointer.\n\nskb->data gets its bogus value via the neigh layer, which does:\n\n1556    __skb_pull(skb, skb_network_offset(skb));\n\n... and the skb was already dodgy at this point:\n\nskb_network_offset(skb) returns a negative value due to an\nearlier overflow of skb->network_header (u16).  __skb_pull thus\n\"adjusts\" skb->data by a huge offset, pointing outside skb->head\narea.\n\nAllow debug builds to splat when we try to pull/push more than\nINT_MAX bytes.\n\nAfter this, the syzkaller reproducer yields a more precise splat\nbefore the flow dissector attempts to read off skb->data memory:\n\nWARNING: CPU: 5 PID: 2313 at include/linux/skbuff.h:2653 neigh_connected_output+0x28e/0x400\n  ip_finish_output2+0xb25/0xed0\n  iptunnel_xmit+0x4ff/0x870\n  ipgre_xmit+0x78e/0xbb0"
            }
         ],
         "affected": [
            {
               "product": "Linux",
               "vendor": "Linux",
               "defaultStatus": "unaffected",
               "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
               "programFiles": [
                  "include/linux/skbuff.h"
               ],
               "versions": [
                  {
                     "version": "1da177e4c3f4",
                     "lessThan": "8af60bb2b215",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "1da177e4c3f4",
                     "lessThan": "1b2b26595bb0",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "1da177e4c3f4",
                     "lessThan": "fff05b2b004d",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "1da177e4c3f4",
                     "lessThan": "219eee9c0d16",
                     "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/linux/skbuff.h"
               ],
               "versions": [
                  {
                     "version": "6.1.86",
                     "lessThanOrEqual": "6.1.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "6.6.27",
                     "lessThanOrEqual": "6.6.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "6.8.6",
                     "lessThanOrEqual": "6.8.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "6.9",
                     "lessThanOrEqual": "*",
                     "status": "unaffected",
                     "versionType": "original_commit_for_fix"
                  }
               ]
            }
         ],
         "references": [
            {
               "url": "https://git.kernel.org/stable/c/8af60bb2b215f478b886f1d6d302fefa7f0b917d"
            },
            {
               "url": "https://git.kernel.org/stable/c/1b2b26595bb09febf14c5444c873ac4ec90a5a77"
            },
            {
               "url": "https://git.kernel.org/stable/c/fff05b2b004d9a8a2416d08647f3dc9068e357c8"
            },
            {
               "url": "https://git.kernel.org/stable/c/219eee9c0d16f1b754a8b85275854ab17df0850a"
            }
         ],
         "title": "net: skbuff: add overflow debug check to pull/push helpers",
         "x_generator": {
            "engine": "bippy-a5840b7849dd"
         }
      }
   },
   "cveMetadata": {
      "assignerOrgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038",
      "cveID": "CVE-2024-35941",
      "requesterUserId": "gregkh@kernel.org",
      "serial": "1",
      "state": "PUBLISHED"
   },
   "dataType": "CVE_RECORD",
   "dataVersion": "5.0"
}