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CVE-2026-42772 on Cyberus Linux 26.05

Aliases: CVE-2026-42772

Packages: openssl_3_6

Status: Resolved

Advisory Information

Issue summary: The QUIC stream reassembly algorithm performance deteriorates progressively as packets are arriving out of order. The worst case has a quadratic complexity proportional to the number of stream frames kept in the buffer for the received stream data.

Impact summary: A remote QUIC peer that completes the handshake can create a connection-scoped CPU pressure and potentially a Denial of Service using compliant STREAM frames inside the advertised receive window, with low attacker bandwidth.

CWE: CWE-407: Inefficient Algorithmic Complexity

Description: OpenSSL manages received QUIC stream fragments using a doubly-linked list. While it optimizes for append operations (at the end of the list), it falls back to a head-to-tail linear search for any fragment that does not immediately follow the current tail.

By manipulating the sequence of offsets, an attacker can force the server to perform O(n^2) operations, consuming excessive CPU time for the QUIC process.

FIPS impact: no The FIPS module is not affected as the QUIC implementation is outside of the OpenSSL FIPS module boundary.

Updates

2026-10-09 02:48 CEST

Metadata changes:

  • Status for package openssl_3_6: “Resolved” (257cd5b258336d6254b2bf4b5c12156b7b8f8821)

2026-10-05 16:30 CEST

Metadata changes:

  • Status for package openssl_3_6: “In Progress” (257cd5b258336d6254b2bf4b5c12156b7b8f8821)

(Amended on: 2026-10-05 16:31 CEST)

2026-10-05 16:28 CEST

Metadata changes:

  • Status for package openssl_3: “Package not supported” (1f5405d51c08776fb35a8dd8ecc33da81cb52f42)

Comment:

OpenSSL 3.0 has reached EOL status and will not receive further security updates.

2026-10-05 16:27 CEST

Metadata changes:

  • Status for package openssl_3_5: “Resolved” (1f5405d51c08776fb35a8dd8ecc33da81cb52f42)

2026-10-05 16:27 CEST

Metadata changes:

  • Status for package openssl_4_0: “Resolved” (1f5405d51c08776fb35a8dd8ecc33da81cb52f42)

2026-10-01 01:19 CEST

Metadata changes:

  • Status for package openssl_3_5: “In Progress” (1f5405d51c08776fb35a8dd8ecc33da81cb52f42)

2026-10-01 01:18 CEST

Metadata changes:

  • Status for package openssl_4_0: “In Progress” (77f391603c7ef9448f3b3cb5d9aa3b01783836d6)

2026-09-30 09:55 CEST

Metadata changes:

  • Status for package openssl_3_5: “In Progress” (1f5405d51c08776fb35a8dd8ecc33da81cb52f42)

2026-09-29 19:52 CEST

Metadata changes:

  • Status for package openssl_3: “Plausible”
  • Status for package openssl_3_5: “Plausible”
  • Status for package openssl_3_6: “Plausible”
  • Status for package openssl_4_0: “Plausible”

(Amended on: 2026-09-29 19:53 CEST)

2026-09-29 19:24 CEST

Metadata changes:

  • Status for package openssl_3: “New”
  • Status for package openssl_3_5: “New”
  • Status for package openssl_3_6: “New”
  • Status for package openssl_4_0: “New”