CVE-2024-39293 (GCVE-0-2024-39293)

Vulnerability from cvelistv5 – Published: 2024-06-25 14:22 – Updated: 2026-08-05 11:33
VLAI
Title
Revert "xsk: Support redirect to any socket bound to the same umem"
Summary
In the Linux kernel, the following vulnerability has been resolved: Revert "xsk: Support redirect to any socket bound to the same umem" This reverts commit 2863d665ea41282379f108e4da6c8a2366ba66db. This patch introduced a potential kernel crash when multiple napi instances redirect to the same AF_XDP socket. By removing the queue_index check, it is possible for multiple napi instances to access the Rx ring at the same time, which will result in a corrupted ring state which can lead to a crash when flushing the rings in __xsk_flush(). This can happen when the linked list of sockets to flush gets corrupted by concurrent accesses. A quick and small fix is not possible, so let us revert this for now.
Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-06-25 20:47 UTC
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6653 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 2863d665ea41282379f108e4da6c8a2366ba66db , < 19cb40b1064566ea09538289bfcf5bc7ecb9b6f5 (git)
Affected: 2863d665ea41282379f108e4da6c8a2366ba66db , < 7fcf26b315bbb728036da0862de6b335da83dff2 (git)
guessed Create a notification for this product.
Linux Linux Affected: 6.9
Unaffected: 0 , < 6.9 (semver)
Unaffected: 6.9.5 , ≤ 6.9.* (semver)
Unaffected: 6.10 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Show details on NVD website
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            "metrics": [
              {
                "other": {
                  "content": {
                    "id": "CVE-2024-39293",
                    "options": [
                      {
                        "Exploitation": "none"
                      },
                      {
                        "Automatable": "no"
                      },
                      {
                        "Technical Impact": "partial"
                      }
                    ],
                    "role": "CISA Coordinator",
                    "timestamp": "2024-06-25T20:47:03.644056Z",
                    "version": "2.0.3"
                  },
                  "type": "ssvc"
                }
              }
            ],
            "providerMetadata": {
              "dateUpdated": "2024-06-25T20:47:12.408Z",
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "title": "CISA ADP Vulnrichment"
          }
        ],
        "cna": {
          "affected": [
            {
              "defaultStatus": "unaffected",
              "product": "Linux",
              "programFiles": [
                "net/xdp/xsk.c"
              ],
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "vendor": "Linux",
              "versions": [
                {
                  "lessThan": "19cb40b1064566ea09538289bfcf5bc7ecb9b6f5",
                  "status": "affected",
                  "version": "2863d665ea41282379f108e4da6c8a2366ba66db",
                  "versionType": "git"
                },
                {
                  "lessThan": "7fcf26b315bbb728036da0862de6b335da83dff2",
                  "status": "affected",
                  "version": "2863d665ea41282379f108e4da6c8a2366ba66db",
                  "versionType": "git"
                }
              ]
            },
            {
              "defaultStatus": "affected",
              "product": "Linux",
              "programFiles": [
                "net/xdp/xsk.c"
              ],
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "vendor": "Linux",
              "versions": [
                {
                  "status": "affected",
                  "version": "6.9"
                },
                {
                  "lessThan": "6.9",
                  "status": "unaffected",
                  "version": "0",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.9.*",
                  "status": "unaffected",
                  "version": "6.9.5",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "*",
                  "status": "unaffected",
                  "version": "6.10",
                  "versionType": "original_commit_for_fix"
                }
              ]
            }
          ],
          "cpeApplicability": [
            {
              "nodes": [
                {
                  "cpeMatch": [
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.9.5",
                      "versionStartIncluding": "6.9",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.10",
                      "versionStartIncluding": "6.9",
                      "vulnerable": true
                    }
                  ],
                  "negate": false,
                  "operator": "OR"
                }
              ]
            }
          ],
          "descriptions": [
            {
              "lang": "en",
              "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nRevert \"xsk: Support redirect to any socket bound to the same umem\"\n\nThis reverts commit 2863d665ea41282379f108e4da6c8a2366ba66db.\n\nThis patch introduced a potential kernel crash when multiple napi instances\nredirect to the same AF_XDP socket. By removing the queue_index check, it is\npossible for multiple napi instances to access the Rx ring at the same time,\nwhich will result in a corrupted ring state which can lead to a crash when\nflushing the rings in __xsk_flush(). This can happen when the linked list of\nsockets to flush gets corrupted by concurrent accesses. A quick and small fix\nis not possible, so let us revert this for now."
            }
          ],
          "metrics": [
            {
              "cvssV3_1": {
                "baseScore": 9.8,
                "baseSeverity": "CRITICAL",
                "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
                "version": "3.1"
              },
              "scenarios": [
                {
                  "lang": "en",
                  "value": "AV:N - The vulnerable code is `xsk_rcv_check()` on the XDP packet-receive path in net/xdp/, reached solely by inbound network frames being redirected via `bpf_redirect_map()` into an XSKMAP. The corruption is driven entirely by remote traffic arriving on multiple RX queues, with no local access required.\nAC:L - The attacker controls both sides of the race by flooding the interface \u2014 RSS hashes distinct 5-tuples across RX queues, so varying source ports deterministically puts multiple NAPI instances on multiple CPUs into the same socket\u0027s Rx ring and flush node simultaneously. The reporter hit this reliably with ordinary production traffic, and the race window recurs on every packet.\nPR:N - Triggering requires only sending packets to the target; the redirect and ring-producer path runs before any authentication or authorization in the network stack. The attacker needs no account, credential, or capability on the victim system.\nUI:N - The corruption occurs in softirq/NAPI context on packet arrival with no victim action required. No user must open, mount, or configure anything at exploit time.\nS:U - The concurrent ring, buffer-pool, and flush-list corruption is confined to kernel memory managed by the same security authority. No VM, IOMMU, or sandbox boundary is crossed.\nC:H - The flush-list corruption produces a type-confused `struct xdp_sock *` derived from a per-CPU list head, giving reads through wild pointers, and the corrupted producer index leaks stale ring/umem contents to userspace. Additionally the new `dev-\u003e_rx[qid]` dereference with cpumap\u0027s uninitialized `queue_index` is an unbounded out-of-bounds kernel read.\nI:H - The same list corruption yields writes through attacker-influenceable wild pointers (`xs-\u003erx-\u003ering-\u003eproducer`, `xs-\u003epool-\u003efq`), `__list_del_clearprev()` writes into stale/freed neighbours, and use-after-free on sockets left linked past `xskq_destroy()`/`sock_put()`. `sock_def_readable()` then walks a wait queue on the confused object, providing an indirect-call control-flow hijack primitive.\nA:H - The maintainer\u0027s revert states the change \"introduced a potential kernel crash,\" with the corrupted flush list leading to a crash in `__xsk_flush()`. NULL dereference in the unchecked `xsk_buff_alloc()` multi-frag path and list-corruption oopses give a reliably reachable kernel panic."
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-08-05T11:33:23.224Z",
            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "shortName": "Linux"
          },
          "references": [
            {
              "url": "https://git.kernel.org/stable/c/19cb40b1064566ea09538289bfcf5bc7ecb9b6f5"
            },
            {
              "url": "https://git.kernel.org/stable/c/7fcf26b315bbb728036da0862de6b335da83dff2"
            }
          ],
          "title": "Revert \"xsk: Support redirect to any socket bound to the same umem\"",
          "x_generator": {
            "engine": "bippy-1.2.0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "assignerShortName": "Linux",
        "cveId": "CVE-2024-39293",
        "datePublished": "2024-06-25T14:22:39.550Z",
        "dateReserved": "2024-06-24T13:53:25.541Z",
        "dateUpdated": "2026-08-05T11:33:23.224Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
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  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

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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.

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