CVE-2026-74631 (GCVE-0-2026-74631)
Vulnerability from cvelistv5
Published
2026-08-22 15:32
Modified
2026-10-16 19:06
Severity ?
8.4 (High) - CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: 9014db202cb764b8e14c53e7bacc81f9a1a2ba7f
Version: 9014db202cb764b8e14c53e7bacc81f9a1a2ba7f
Version: 9014db202cb764b8e14c53e7bacc81f9a1a2ba7f
Version: 9014db202cb764b8e14c53e7bacc81f9a1a2ba7f
Version: 9014db202cb764b8e14c53e7bacc81f9a1a2ba7f
Version: 9014db202cb764b8e14c53e7bacc81f9a1a2ba7f
Version: 9014db202cb764b8e14c53e7bacc81f9a1a2ba7f
Version: 9014db202cb764b8e14c53e7bacc81f9a1a2ba7f
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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. This fixes a refcount imbalance that can underflow page\\nrefcounts and trigger a use-after-free.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.266\", \"versionStartIncluding\": \"4.18\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.217\", \"versionStartIncluding\": \"4.18\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.183\", \"versionStartIncluding\": \"4.18\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.152\", \"versionStartIncluding\": \"4.18\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.104\", \"versionStartIncluding\": \"4.18\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.18.45\", \"versionStartIncluding\": \"4.18\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.1.9\", \"versionStartIncluding\": \"4.18\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.2\", \"versionStartIncluding\": \"4.18\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-25T05:40:55.722Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-74631\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-10-16T19:06:03.774Z\", \"dateReserved\": \"2026-08-15T05:44:03.922Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2026-08-22T15:32:12.334Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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