CVE-2026-31638 (GCVE-0-2026-31638)

Vulnerability from cvelistv5 – Published: 2026-04-24 14:44 – Updated: 2026-04-27 14:04
VLAI?
Title
rxrpc: Only put the call ref if one was acquired
Summary
In the Linux kernel, the following vulnerability has been resolved: rxrpc: Only put the call ref if one was acquired rxrpc_input_packet_on_conn() can process a to-client packet after the current client call on the channel has already been torn down. In that case chan->call is NULL, rxrpc_try_get_call() returns NULL and there is no reference to drop. The client-side implicit-end error path does not account for that and unconditionally calls rxrpc_put_call(). This turns a protocol error path into a kernel crash instead of rejecting the packet. Only drop the call reference if one was actually acquired. Keep the existing protocol error handling unchanged.
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
Linux Linux Affected: 5e6ef4f1017c7f844e305283bbd8875af475e2fc , < b8f66447448d6c305a51413a67ec8ed26aa7d1dd (git)
Affected: 5e6ef4f1017c7f844e305283bbd8875af475e2fc , < 0c156aff8a2d4fa0d61db7837641975cf0e5452d (git)
Affected: 5e6ef4f1017c7f844e305283bbd8875af475e2fc , < 8299ca146489664e3c0c90a3b8900d8335b1ede4 (git)
Affected: 5e6ef4f1017c7f844e305283bbd8875af475e2fc , < 9fb09861e2b8d1abfe2efaf260c9f1d30080ea38 (git)
Affected: 5e6ef4f1017c7f844e305283bbd8875af475e2fc , < 6331f1b24a3e85465f6454e003a3e6c22005a5c5 (git)
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    Linux Linux Affected: 6.2
Unaffected: 0 , < 6.2 (semver)
Unaffected: 6.6.135 , ≤ 6.6.* (semver)
Unaffected: 6.12.82 , ≤ 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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  }
}


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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

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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.



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