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CVE-2022-50838 (GCVE-0-2022-50838)

Vulnerability from cvelistv5 – Published: 2025-12-30 12:10 – Updated: 2026-05-23 15:25
VLAI
Title
net: stream: purge sk_error_queue in sk_stream_kill_queues()
Summary
In the Linux kernel, the following vulnerability has been resolved: net: stream: purge sk_error_queue in sk_stream_kill_queues() Changheon Lee reported TCP socket leaks, with a nice repro. It seems we leak TCP sockets with the following sequence: 1) SOF_TIMESTAMPING_TX_ACK is enabled on the socket. Each ACK will cook an skb put in error queue, from __skb_tstamp_tx(). __skb_tstamp_tx() is using skb_clone(), unless SOF_TIMESTAMPING_OPT_TSONLY was also requested. 2) If the application is also using MSG_ZEROCOPY, then we put in the error queue cloned skbs that had a struct ubuf_info attached to them. Whenever an struct ubuf_info is allocated, sock_zerocopy_alloc() does a sock_hold(). As long as the cloned skbs are still in sk_error_queue, socket refcount is kept elevated. 3) Application closes the socket, while error queue is not empty. Since tcp_close() no longer purges the socket error queue, we might end up with a TCP socket with at least one skb in error queue keeping the socket alive forever. This bug can be (ab)used to consume all kernel memory and freeze the host. We need to purge the error queue, with proper synchronization against concurrent writers.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 7737b104c211fa843de268b897d601e070292a72 , < c8c1eec578a9ae2dc8f14a1846942a0b7bf29d1d (git)
Affected: 89be5c357de34718eaaaefed80737f432c5ab86f , < bab542cf56fc174c8447c00b73be99ffd66d2d39 (git)
Affected: 8b8b3d738e450d2c2ccdc75f0ab5a951746c2a96 , < 6f00bd0402a1e3d2d556afba57c045bd7931e4d3 (git)
Affected: b631c603b5fb98d2bd709c35d384901965a3dd51 , < 4f1d37ff4226eb99d6b69e9f4518e279e1a851bf (git)
Affected: daf15fa1fd997749e881aedd9f03f73a11240e82 , < 9062493811676ee0efe6c74d98f00ca38c4e17d4 (git)
Affected: 3988164fe9ddf98ebf5b5cdede91ac38c5f08a7e , < 9da204cd67c4fe97e8aa465d10d5c2e7076f7f42 (git)
Affected: 24bcbe1cc69fa52dc4f7b5b2456678ed464724d8 , < 8c330c36b3970d0917f48827fa6c7a9c75aa4602 (git)
Affected: 24bcbe1cc69fa52dc4f7b5b2456678ed464724d8 , < b458d349f8753f666233828ebd30df6f100cf7d5 (git)
Affected: 24bcbe1cc69fa52dc4f7b5b2456678ed464724d8 , < e0c8bccd40fc1c19e1d246c39bcf79e357e1ada3 (git)
Affected: 6ba975e14f5ebb87143d737c493adf4031409a68 (git)
Affected: 4437f3ead9e85c35fe0e3adfb98c0b97eaa267eb (git)
Affected: 4.9.291 , < 4.9.337 (semver)
Affected: 4.14.256 , < 4.14.303 (semver)
Affected: 4.19.218 , < 4.19.270 (semver)
Affected: 5.4.160 , < 5.4.229 (semver)
Affected: 5.10.80 , < 5.10.163 (semver)
Affected: 5.15.3 , < 5.15.86 (semver)
Affected: 4.4.293 , < 4.5 (semver)
Affected: 5.14.19 , < 5.15 (semver)
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Linux Linux Affected: 5.16
Unaffected: 0 , < 5.16 (semver)
Unaffected: 4.9.337 , ≤ 4.9.* (semver)
Unaffected: 4.14.303 , ≤ 4.14.* (semver)
Unaffected: 4.19.270 , ≤ 4.19.* (semver)
Unaffected: 5.4.229 , ≤ 5.4.* (semver)
Unaffected: 5.10.163 , ≤ 5.10.* (semver)
Unaffected: 5.15.86 , ≤ 5.15.* (semver)
Unaffected: 6.0.16 , ≤ 6.0.* (semver)
Unaffected: 6.1.2 , ≤ 6.1.* (semver)
Unaffected: 6.2 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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            ],
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
          }
        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: stream: purge sk_error_queue in sk_stream_kill_queues()\n\nChangheon Lee reported TCP socket leaks, with a nice repro.\n\nIt seems we leak TCP sockets with the following sequence:\n\n1) SOF_TIMESTAMPING_TX_ACK is enabled on the socket.\n\n   Each ACK will cook an skb put in error queue, from __skb_tstamp_tx().\n   __skb_tstamp_tx() is using skb_clone(), unless\n   SOF_TIMESTAMPING_OPT_TSONLY was also requested.\n\n2) If the application is also using MSG_ZEROCOPY, then we put in the\n   error queue cloned skbs that had a struct ubuf_info attached to them.\n\n   Whenever an struct ubuf_info is allocated, sock_zerocopy_alloc()\n   does a sock_hold().\n\n   As long as the cloned skbs are still in sk_error_queue,\n   socket refcount is kept elevated.\n\n3) Application closes the socket, while error queue is not empty.\n\nSince tcp_close() no longer purges the socket error queue,\nwe might end up with a TCP socket with at least one skb in\nerror queue keeping the socket alive forever.\n\nThis bug can be (ab)used to consume all kernel memory\nand freeze the host.\n\nWe need to purge the error queue, with proper synchronization\nagainst concurrent writers."
          }
        ],
        "id": "CVE-2022-50838",
        "lastModified": "2026-06-17T05:24:16.417",
        "metrics": {},
        "published": "2025-12-30T13:15:58.350",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/4f1d37ff4226eb99d6b69e9f4518e279e1a851bf"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/6f00bd0402a1e3d2d556afba57c045bd7931e4d3"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/8c330c36b3970d0917f48827fa6c7a9c75aa4602"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/9062493811676ee0efe6c74d98f00ca38c4e17d4"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/9da204cd67c4fe97e8aa465d10d5c2e7076f7f42"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/b458d349f8753f666233828ebd30df6f100cf7d5"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/bab542cf56fc174c8447c00b73be99ffd66d2d39"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/c8c1eec578a9ae2dc8f14a1846942a0b7bf29d1d"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/e0c8bccd40fc1c19e1d246c39bcf79e357e1ada3"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Deferred"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-07-08T12:28:21+00:00",
      "cve": "CVE-2022-50838",
      "id": "CVE-2022-50838",
      "initial_release_date": "2022-01-01T00:00:00+00:00",
      "product_status:known_affected": "170",
      "product_status:known_not_affected": "104",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: net: stream: purge sk_error_queue in sk_stream_kill_queues()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2022/cve-2022-50838.json",
      "version": "3"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


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Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.