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CVE-2026-31676 (GCVE-0-2026-31676)

Vulnerability from cvelistv5 – Published: 2026-04-25 08:46 – Updated: 2026-08-05 12:24
VLAI
Title
rxrpc: only handle RESPONSE during service challenge
Summary
In the Linux kernel, the following vulnerability has been resolved: rxrpc: only handle RESPONSE during service challenge Only process RESPONSE packets while the service connection is still in RXRPC_CONN_SERVICE_CHALLENGING. Check that state under state_lock before running response verification and security initialization, then use a local secured flag to decide whether to queue the secured-connection work after the state transition. This keeps duplicate or late RESPONSE packets from re-running the setup path and removes the unlocked post-transition state test.
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: 17926a79320afa9b95df6b977b40cca6d8713cea , < a1a8efde03a40b6c658d580e96644d9b9a2a0d3a (git)
Affected: 17926a79320afa9b95df6b977b40cca6d8713cea , < 6c3a0fbdafef8316e34ae22333e317a341e737cd (git)
Affected: 17926a79320afa9b95df6b977b40cca6d8713cea , < 0afdfd4941c1b60a1f5c361760daa970edca60cd (git)
Affected: 17926a79320afa9b95df6b977b40cca6d8713cea , < a6bcf8010af093fe04f7100562e9542ab7882585 (git)
Affected: 17926a79320afa9b95df6b977b40cca6d8713cea , < 29b44d904dceb832be880def08b8cb17a0aba91c (git)
Affected: 17926a79320afa9b95df6b977b40cca6d8713cea , < d0035e634dae83237ab7f5681eb52b2f65d0ceb8 (git)
Affected: 17926a79320afa9b95df6b977b40cca6d8713cea , < 03fd2ef73cb4ffd0af100a95b634af54f474414e (git)
Affected: 17926a79320afa9b95df6b977b40cca6d8713cea , < c43ffdcfdbb5567b1f143556df8a04b4eeea041c (git)
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Linux Linux Affected: 2.6.22
Unaffected: 0 , < 2.6.22 (semver)
Unaffected: 5.10.258 , ≤ 5.10.* (semver)
Unaffected: 5.15.209 , ≤ 5.15.* (semver)
Unaffected: 6.1.175 , ≤ 6.1.* (semver)
Unaffected: 6.6.136 , ≤ 6.6.* (semver)
Unaffected: 6.12.84 , ≤ 6.12.* (semver)
Unaffected: 6.18.23 , ≤ 6.18.* (semver)
Unaffected: 6.19.13 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-07-02T19:17:14+00:00",
      "cve": "CVE-2026-31676",
      "id": "CVE-2026-31676",
      "initial_release_date": "2026-04-25T00:00:00+00:00",
      "product_status:known_affected": "260",
      "product_status:known_not_affected": "14",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: rxrpc: only handle RESPONSE during service challenge",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-31676.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-11T01:29:28Z",
      "cve": "CVE-2026-31676",
      "id": "CVE-2026-31676",
      "initial_release_date": "2026-04-26T01:52:46Z",
      "product_status:known_affected": "409",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-31676",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-31676.json",
      "version": "8"
    }
  }
}



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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.