CVE-2025-39880 (GCVE-0-2025-39880)

Vulnerability from cvelistv5 – Published: 2025-09-23 06:00 – Updated: 2026-08-05 12:05
VLAI
Title
libceph: fix invalid accesses to ceph_connection_v1_info
Summary
In the Linux kernel, the following vulnerability has been resolved: libceph: fix invalid accesses to ceph_connection_v1_info There is a place where generic code in messenger.c is reading and another place where it is writing to con->v1 union member without checking that the union member is active (i.e. msgr1 is in use). On 64-bit systems, con->v1.auth_retry overlaps with con->v2.out_iter, so such a read is almost guaranteed to return a bogus value instead of 0 when msgr2 is in use. This ends up being fairly benign because the side effect is just the invalidation of the authorizer and successive fetching of new tickets. con->v1.connect_seq overlaps with con->v2.conn_bufs and the fact that it's being written to can cause more serious consequences, but luckily it's not something that happens often.
Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: cd1a677cad994021b19665ed476aea63f5d54f31 , < ea12ab684f8ae8a6da11a22c78d94a79e2163096 (git)
Affected: cd1a677cad994021b19665ed476aea63f5d54f31 , < 591ea9c30737663a471b2bb07b27ddde86b020d5 (git)
Affected: cd1a677cad994021b19665ed476aea63f5d54f31 , < 23538cfbeed87159a5ac6c61e7a6de3d8d4486a8 (git)
Affected: cd1a677cad994021b19665ed476aea63f5d54f31 , < 35dbbc3dbf8bccb2d77c68444f42c1e6d2d27983 (git)
Affected: cd1a677cad994021b19665ed476aea63f5d54f31 , < 6bd8b56899be0b514945f639a89ccafb8f8dfaef (git)
Affected: cd1a677cad994021b19665ed476aea63f5d54f31 , < cdbc9836c7afadad68f374791738f118263c5371 (git)
Create a notification for this product.
Linux Linux Affected: 5.11
Unaffected: 0 , < 5.11 (semver)
Unaffected: 5.15.194 , ≤ 5.15.* (semver)
Unaffected: 6.1.153 , ≤ 6.1.* (semver)
Unaffected: 6.6.107 , ≤ 6.6.* (semver)
Unaffected: 6.12.48 , ≤ 6.12.* (semver)
Unaffected: 6.16.8 , ≤ 6.16.* (semver)
Unaffected: 6.17 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-07-30T08:58:17+00:00",
      "cve": "CVE-2025-39880",
      "id": "CVE-2025-39880",
      "initial_release_date": "2025-09-23T00:00:00+00:00",
      "product_status:known_affected": "232",
      "product_status:known_not_affected": "42",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: libceph: fix invalid accesses to ceph_connection_v1_info",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-39880.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.

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.