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CVE-2022-50676 (GCVE-0-2022-50676)

Vulnerability from cvelistv5 – Published: 2025-12-09 01:29 – Updated: 2026-08-05 08:59
VLAI
Title
net: rds: don't hold sock lock when cancelling work from rds_tcp_reset_callbacks()
Summary
In the Linux kernel, the following vulnerability has been resolved: net: rds: don't hold sock lock when cancelling work from rds_tcp_reset_callbacks() syzbot is reporting lockdep warning at rds_tcp_reset_callbacks() [1], for commit ac3615e7f3cffe2a ("RDS: TCP: Reduce code duplication in rds_tcp_reset_callbacks()") added cancel_delayed_work_sync() into a section protected by lock_sock() without realizing that rds_send_xmit() might call lock_sock(). We don't need to protect cancel_delayed_work_sync() using lock_sock(), for even if rds_{send,recv}_worker() re-queued this work while __flush_work() from cancel_delayed_work_sync() was waiting for this work to complete, retried rds_{send,recv}_worker() is no-op due to the absence of RDS_CONN_UP bit.
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: ac3615e7f3cffe2a1a6b25172dfd09e138593d82 , < 5d2ba255e93211e541373469dffbda7c99dfa0e5 (git)
Affected: ac3615e7f3cffe2a1a6b25172dfd09e138593d82 , < 2425007c0967a7c04b0dee7cce05ecf0ca869ad1 (git)
Affected: ac3615e7f3cffe2a1a6b25172dfd09e138593d82 , < e3cb25d3ad08f5dbd53ce2b31720cad529944322 (git)
Affected: ac3615e7f3cffe2a1a6b25172dfd09e138593d82 , < 360aa7219285fac63dab99706a16f2daf3222abe (git)
Affected: ac3615e7f3cffe2a1a6b25172dfd09e138593d82 , < da349221c4d2d4ac5f606c1c3b36d4ef0b3e6a0c (git)
Affected: ac3615e7f3cffe2a1a6b25172dfd09e138593d82 , < 30bfa5aa7228eb1e67663d67e553627e572cc717 (git)
Affected: ac3615e7f3cffe2a1a6b25172dfd09e138593d82 , < c380c28ab9b15fc53565909c814f6dd3e7f77c4b (git)
Affected: ac3615e7f3cffe2a1a6b25172dfd09e138593d82 , < afe7053c390fe8ff27d0c2ceaece5625283044ba (git)
Affected: ac3615e7f3cffe2a1a6b25172dfd09e138593d82 , < a91b750fd6629354460282bbf5146c01b05c4859 (git)
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Linux Linux Affected: 4.8
Unaffected: 0 , < 4.8 (semver)
Unaffected: 4.9.331 , ≤ 4.9.* (semver)
Unaffected: 4.14.296 , ≤ 4.14.* (semver)
Unaffected: 4.19.262 , ≤ 4.19.* (semver)
Unaffected: 5.4.220 , ≤ 5.4.* (semver)
Unaffected: 5.10.150 , ≤ 5.10.* (semver)
Unaffected: 5.15.75 , ≤ 5.15.* (semver)
Unaffected: 5.19.17 , ≤ 5.19.* (semver)
Unaffected: 6.0.3 , ≤ 6.0.* (semver)
Unaffected: 6.1 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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              "value": "AV:N - The vulnerable rds_tcp_reset_callbacks() path is reached from rds_tcp_accept_one() when a remote peer TCP-connects to the RDS/TCP listener on port 16385 during duelling-SYN/reconnect handling; in an RDS-cluster deployment this is a network-facing path without requiring a local syscall.\nAC:L - A remote peer can drive reconnects while send/recv workers are active (normal RDS traffic), controlling both sides of the lock-ordering race; no rare victim-only state beyond an active RDS/TCP deployment is required.\nPR:N - The RDS/TCP accept path performs no peer authentication or credential check before reaching rds_tcp_reset_callbacks(); connecting to the listener is sufficient.\nUI:N - No victim action is required; the attacker triggers the path by initiating TCP reconnect/duelling-SYN sequences against the RDS listener.\nS:U - Impact is confined to kernel locking/availability on the same host; it does not cross a VM, IOMMU, or other separate security boundary.\nC:N - This is a circular locking dependency / deadlock only; there is no memory disclosure, OOB read, or UAF read primitive.\nI:N - There is no memory corruption or write primitive; the fix only reorders cancel_delayed_work_sync() relative to lock_sock(), with no integrity-impacting exploit path.\nA:H - Holding the socket lock across cancel_delayed_work_sync() can deadlock against rds_send_worker/rds_recv_worker (which take the same sock lock via cork/recv), hanging the RDS workqueue and denying service."
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-04T19:37:51+00:00",
      "cve": "CVE-2022-50676",
      "id": "CVE-2022-50676",
      "initial_release_date": "2022-01-01T00:00:00+00:00",
      "product_status:known_affected": "14",
      "product_status:known_not_affected": "260",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: net: rds: don\u0027t hold sock lock when cancelling work from rds_tcp_reset_callbacks()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2022/cve-2022-50676.json",
      "version": "3"
    }
  }
}



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Tags
Taxonomy of the tags.





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.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

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.