{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-64061",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-64061"
  ],
  "published": "2026-07-19T15:41:06Z",
  "summary": "netfs: Fix early put of sink folio in netfs_read_gaps()",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfs: Fix early put of sink folio in netfs_read_gaps()\n\nFix netfs_read_gaps() to release the sink page it uses after waiting for\nthe request to complete.  The way the sink page is used is that an\nITER_BVEC-class iterator is created that has the gaps from the target folio\nat either end, but has the sink page tiled over the middle so that a single\nread op can fill in both gaps.\n\nThe bug was found by KASAN detecting a UAF on the generic/075 xfstest in\nthe cifsd kernel thread that handles reception of data from the TCP socket:\n\n BUG: KASAN: use-after-free in _copy_to_iter+0x48a/0xa20\n Write of size 885 at addr ffff888107f92000 by task cifsd/1285\n CPU: 2 UID: 0 PID: 1285 Comm: cifsd Not tainted 7.0.0 #6 PREEMPT(lazy)\n Call Trace:\n  dump_stack_lvl+0x5d/0x80\n  print_report+0x17f/0x4f1\n  kasan_report+0x100/0x1e0\n  kasan_check_range+0x10f/0x1e0\n  __asan_memcpy+0x3c/0x60\n  _copy_to_iter+0x48a/0xa20\n  __skb_datagram_iter+0x2c9/0x430\n  skb_copy_datagram_iter+0x6e/0x160\n  tcp_recvmsg_locked+0xce0/0x1130\n  tcp_recvmsg+0xeb/0x300\n  inet_recvmsg+0xcf/0x3a0\n  sock_recvmsg+0xea/0x100\n  cifs_readv_from_socket+0x3a6/0x4d0 [cifs]\n  cifs_read_iter_from_socket+0xdd/0x130 [cifs]\n  cifs_readv_receive+0xaad/0xb10 [cifs]\n  cifs_demultiplex_thread+0x1148/0x1740 [cifs]\n  kthread+0x1cf/0x210",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
    }
  ],
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            "linux_commit": "359f37f0faefb712add32a39f98751aea67d5c1f",
            "upstream_version": "6.12.47",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.12.92"
          },
          "1:6.12.62-1+rpt1": {
            "linux_commit": "a1073743767f9e7fdc7017ababd2a07ea0c97c1c",
            "upstream_version": "6.12.62",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.12.92"
          },
          "1:6.12.75-1+rpt1": {
            "linux_commit": "89050b1059997d38d55462b323b099a6436dc10d",
            "upstream_version": "6.12.75",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.12.92"
          },
          "1:6.18.29-1+rpt1": {
            "linux_commit": "66318c5b5cd8145a662303af12ed39ac07eb27cc",
            "upstream_version": "6.18.29",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.34"
          },
          "1:6.18.33-1+rpt1": {
            "linux_commit": "95b85bebbedcaedfa7ca79116ed38b7376fba412",
            "upstream_version": "6.18.33",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.34"
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-64061"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/2a39d49c8d97df8cb8fa80c10859bc1ba7358c6b"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/d4f4bc87c76511cf2532448b0fa40c25e894bd7d"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/412e8bad48967fd34295866636c028befd27d8b9"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/3e5dd91b87a8b1450217b56a336bee315f40da7d"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-05T13:16:28Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 9.8,
      "cvss_v3_severity": "Critical",
      "scenario": "AV:N - The UAF write occurs in the CIFS client kernel thread while copying SMB read-response data received over TCP; a compromised or malicious network filesystem server can supply attacker-controlled payload once a client performs normal buffered read/write on a mounted share.\nAC:L - The bug is deterministic\u2014folio_put(sink) always runs before netfs_wait_for_read() completes\u2014so an attacker who can create a dirty streaming-write folio and then read it reliably triggers the UAF without winning a race.\nPR:N - A remote malicious/compromised SMB/NFS/9p/Ceph server attacker needs no local privileges on the victim; exploitation requires only ordinary file access on an existing network mount, not root or special capabilities.\nUI:N - No special victim interaction beyond normal file read/write operations on a mounted network filesystem; persistent automounts and server-driven workloads make mount-time interaction unnecessary for exploitation.\nS:U - Impact is kernel heap memory corruption within the same kernel security domain; it does not cross VM, container, or IOMMU boundaries.\nC:H - Use-after-free of a page-cache folio enables heap grooming and arbitrary kernel memory read primitives; UAF class bugs are scored High for confidentiality per kernel CNA guidance.\nI:H - The UAF is a write primitive\u2014KASAN reported an 885-byte write of network-supplied data into freed memory\u2014enabling controlled heap corruption and potential code execution.\nA:H - UAF during network I/O can cause kernel oops/panic and denial of service to all workloads on the host; UAF bugs are scored High for availability per kernel CNA guidance."
    }
  }
}