xsk: fix OOB map writes when deleting elements

{
  "id": "ec7c3385655d1f44dd2243852c393e69af61ba47e2e54c283b706dd099b173ca",
  "url": "https://osv.dev/vulnerability/CVE-2024-56614",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "xsk: fix OOB map writes when deleting elements",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: xsk: fix OOB map writes when deleting elements Jordy says: \" In the xsk_map_delete_elem function an unsigned integer (map->max_entries) is compared with a user-controlled signed integer (k). Due to implicit type conversion, a large unsigned value for map->max_entries can bypass the intended bounds check: if (k >= map->max_entries) return -EINVAL; This allows k to hold a negative value (between -2147483648 and -2), which is then used as an array index in m->xsk_map[k], which results in an out-of-bounds access. spin_lock_bh(&m->lock); map_entry = &m->xsk_map[k]; // Out-of-bounds map_entry old_xs = unrcu_pointer(xchg(map_entry, NULL)); // Oob write if (old_xs) xsk_map_sock_delete(old_xs, map_entry); spin_unlock_bh(&m->lock); The xchg operation can then be used to cause an out-of-bounds write. Moreover, the invalid map_entry passed to xsk_map_sock_delete can lead to further memory corruption. \" It indeed results in following splat: [76612.897343] BUG: unable to handle page fault for address: ffffc8fc2e461108 [76612.904330] #PF: supervisor write access in kernel mode [76612.909639] #PF: error_code(0x0002) - not-present page [76612.914855] PGD 0 P4D 0 [76612.917431] Oops: Oops: 0002 [#1] PREEMPT SMP [76612.921859] CPU: 11 UID: 0 PID: 10318 Comm: a.out Not tainted 6.12.0-rc1+ #470 [76612.929189] Hardware name: Intel Corporation S2600WFT/S2600WFT, BIOS SE5C620.86B.02.01.0008.031920191559 03/19/2019 [76612.939781] RIP",
    "evidence": "osv:CVE-2024-56614",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "5.15.174",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.1.120",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.6.66",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.12.5",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "CVE-2024-56614",
      "aliases": [
        "CVE-2024-56614"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "fbfc504a24f53f7ebe128ab55cb5dba634f4ece8"
                },
                {
                  "fixed": "4d03f705e9d7aabebc6bfa5810f8aab6d176cbb7"
                },
                {
                  "fixed": "ed08c93d5a9801cc8f224a046411fd603c538d07"
                },
                {
                  "fixed": "f8abd03f83d5fe81e76eb93e2c4373eb9f75fd8a"
                },
                {
                  "fixed": "d486b5741d987d3e0e6be4ac22cafdf94e6d1a47"
                },
                {
                  "fixed": "32cd3db7de97c0c7a018756ce66244342fd583f0"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2024-56614.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "4.18.0"
                },
                {
                  "fixed": "5.15.174"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.16.0"
                },
                {
                  "fixed": "6.1.120"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.2.0"
                },
                {
                  "fixed": "6.6.66"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.7.0"
                },
                {
                  "fixed": "6.12.5"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2024-56614.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:37.996115099Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/32cd3db7de97c0c7a018756ce66244342fd583f0",
        "https://git.kernel.org/stable/c/4d03f705e9d7aabebc6bfa5810f8aab6d176cbb7",
        "https://git.kernel.org/stable/c/d486b5741d987d3e0e6be4ac22cafdf94e6d1a47",
        "https://git.kernel.org/stable/c/ed08c93d5a9801cc8f224a046411fd603c538d07",
        "https://git.kernel.org/stable/c/f8abd03f83d5fe81e76eb93e2c4373eb9f75fd8a",
        "https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/56xxx/CVE-2024-56614.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2024-56614",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/56xxx/CVE-2024-56614.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2024-56614",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 505015,
  "published_at": "2024-12-27T14:51:19.154+00:00"
}