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CVE-2026-74631 (GCVE-0-2026-74631)

Vulnerability from cvelistv5 – Published: 2026-08-22 15:32 – Updated: 2026-08-25 05:40
VLAI
Title
net: smc: fix splice entry lifetime imbalance in smc_rx_splice
Summary
In the Linux kernel, the following vulnerability has been resolved: net: smc: fix splice entry lifetime imbalance in smc_rx_splice smc_rx_splice() passes pages to splice_to_pipe() before taking the references that cover the lifetime of each splice entry. In the VM-backed RMB path, splice_to_pipe() may drop unqueued entries through smc_rx_spd_release(), while queued entries are released later via the pipe buffer callback. The old post-splice accounting also derives the number of queued VM pages from an offset mutated while building the descriptor, and a multi-page splice pairs one sock_hold() with multiple sock_put() calls. Take the page and socket references for every candidate entry before splice_to_pipe(), and drop the matching private state, page reference, and socket reference from smc_rx_spd_release() for entries that never get queued. This fixes a refcount imbalance that can underflow page refcounts and trigger a use-after-free.
Severity
8.4 (High)
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 9014db202cb764b8e14c53e7bacc81f9a1a2ba7f , < 7ddc7af2ae7fc5a0c0635b245c0824c8b76de5cb (git)
Affected: 9014db202cb764b8e14c53e7bacc81f9a1a2ba7f , < 07ad246529d136d5ef441d5ab4c305d132ff3090 (git)
Affected: 9014db202cb764b8e14c53e7bacc81f9a1a2ba7f , < c841789e456ec6751342fa800639ce8e82ff0e6b (git)
Affected: 9014db202cb764b8e14c53e7bacc81f9a1a2ba7f , < af02c67ce654356c58db20a0bb2db33ace3b07a8 (git)
Affected: 9014db202cb764b8e14c53e7bacc81f9a1a2ba7f , < ca8342b5fc24c249fdb998468f6a168b457c67e5 (git)
Affected: 9014db202cb764b8e14c53e7bacc81f9a1a2ba7f , < 0b7d54cedea5cb158e21925ae0c6c2f5c87ed2a0 (git)
Affected: 9014db202cb764b8e14c53e7bacc81f9a1a2ba7f , < 4515c78f4d9fd577270f012efeb062ea58b3682d (git)
Affected: 9014db202cb764b8e14c53e7bacc81f9a1a2ba7f , < 5d9686af2976741bbd79b150d1c9e60b81e7f12e (git)
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Linux Linux Affected: 4.18
Unaffected: 0 , < 4.18 (semver)
Unaffected: 5.10.266 , ≤ 5.10.* (semver)
Unaffected: 5.15.217 , ≤ 5.15.* (semver)
Unaffected: 6.1.183 , ≤ 6.1.* (semver)
Unaffected: 6.6.152 , ≤ 6.6.* (semver)
Unaffected: 6.12.104 , ≤ 6.12.* (semver)
Unaffected: 6.18.45 , ≤ 6.18.* (semver)
Unaffected: 7.1.9 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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              "value": "AV:L - smc_rx_splice is only reached via splice()/tee() on an SMC socket FD (syscall -\u003e smc_splice_read -\u003e smc_rx_recvmsg with pipe set); remote SMC peers can supply receive-buffer data but cannot execute the vulnerable splice path without a local process invoking splice on that socket.\nAC:L - The attacker controls splice length, can nearly fill the destination pipe to force splice_to_pipe to drop unqueued entries via smc_rx_spd_release, and can hit the multi-page VM-backed RMB path (smcr_buf_type or mixed-buffer vmalloc fallback); no timing race or external victim state is required.\nPR:N - Exploitation requires only completing an SMC session as a network peer to a victim that reads with splice (common zero-copy SMC pattern); no local account, capabilities, or namespace-admin rights on the victim host are needed beyond normal remote connectivity to the SMC service.\nUI:N - No per-exploit victim action is needed beyond an application already using splice on SMC receive; a malicious peer can deliver the receive data while the victim\u0027s normal automated splice path triggers the refcount imbalance without prompts or manual steps.\nS:U - Impact is kernel page refcount underflow and use-after-free within the same kernel security boundary, enabling privilege escalation or crash on the host; it does not cross VM, IOMMU, or sandbox authority boundaries.\nC:H - Refcount imbalance lets smc_rx_spd_release and pipe-buffer teardown free pages while still referenced, creating a UAF on RMB pages that can be turned into arbitrary kernel memory disclosure via heap reuse and spraying.\nI:H - Corrupted page lifetime and dangling pipe_buffer state enable heap metadata corruption and arbitrary kernel writes from the UAF primitive, supporting control-flow hijacking and local privilege escalation.\nA:H - Page refcount underflow and UAF during splice teardown can cause immediate kernel oops/panic; repeated splice from an SMC peer reliably triggers denial-of-service even when full exploitation is not attempted."
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In the\\nVM-backed RMB path, splice_to_pipe() may drop unqueued entries through\\nsmc_rx_spd_release(), while queued entries are released later via the\\npipe buffer callback.\\n\\nThe old post-splice accounting also derives the number of queued VM pages\\nfrom an offset mutated while building the descriptor, and a multi-page\\nsplice pairs one sock_hold() with multiple sock_put() calls.\\n\\nTake the page and socket references for every candidate entry before\\nsplice_to_pipe(), and drop the matching private state, page reference,\\nand socket reference from smc_rx_spd_release() for entries that never\\nget queued. 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    "redhat_vex": {
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      "cve": "CVE-2026-74631",
      "id": "CVE-2026-74631",
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      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-74631",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-74631.json",
      "version": "2"
    }
  }
}



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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.