{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-74485",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-74485"
  ],
  "published": "2026-08-15T12:28:42Z",
  "summary": "binfmt_misc: reject a flag character as the field delimiter",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nbinfmt_misc: reject a flag character as the field delimiter\n\nThe registration string starts with a user chosen delimiter that\nseparates the individual fields. So that the field parsers terminate\neven on a truncated string create_entry() pads the buffer with that\nsame delimiter:\n\n\tmemset(buf + count, del, 8);\n\nMost fields are scanned for the delimiter with strchr()/scanarg() and\nhappily stop on the padding. The flags field is different: instead of\nscanning for the delimiter check_special_flags() consumes the flag\ncharacters 'P', 'O', 'C' and 'F' and stops at the first byte that is\nnone of them, relying on the trailing delimiter to end the scan.\n\nIf the delimiter is itself a flag character the padding no longer acts\nas a terminator. The scan swallows all eight padding bytes and keeps\nreading past the end of the allocation until it hits a byte that is\nnot a flag character. For example registering\n\n\tPaPEPPxPPiP\n\nwith 'P' as the delimiter (name \"a\", type extension, magic \"x\",\ninterpreter \"i\", empty flags) leaves the flag scan running off the end\nof the buffer. The registration is rejected in the end because the\nparser does not stop exactly at buf + count, but only after the out of\nbounds read has already happened. With an unlucky allocation layout the\nscan can walk into an unmapped page; under KASAN it is reported as a\nslab out of bounds read. binfmt_misc mounts are available to\nunprivileged users in a user namespace so the read is reachable without\nprivileges.\n\nReject a delimiter that is one of the flag characters up front. Such a\nregistration was always rejected anyway, only after the out of bounds\nread, so no valid registration string changes meaning.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H"
    }
  ],
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            "upstream_fixed": "6.12.103"
          },
          "1:6.12.75-1+rpt1": {
            "linux_commit": "89050b1059997d38d55462b323b099a6436dc10d",
            "upstream_version": "6.12.75",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.12.103"
          },
          "1:6.18.29-1+rpt1": {
            "linux_commit": "66318c5b5cd8145a662303af12ed39ac07eb27cc",
            "upstream_version": "6.18.29",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.44"
          },
          "1:6.18.33-1+rpt1": {
            "linux_commit": "95b85bebbedcaedfa7ca79116ed38b7376fba412",
            "upstream_version": "6.18.33",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.44"
          },
          "1:6.18.34-1+rpt1": {
            "linux_commit": "c8c7494100e99ee05b11aaa4f0588a223a63d1af",
            "upstream_version": "6.18.34",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.44"
          },
          "1:6.18.39-1+rpt1": {
            "linux_commit": "60ea684a8ace97bb0db1a16e20753bdd6ab371ff",
            "upstream_version": "6.18.39",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.44"
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-74485"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/96bd5d4fea2970b9b08265293ca7a10b9b27c0fd"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/9970e094e5d60f0d66914bf9a97d1ef19107ebf5"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/b29e3c1f375c1296362d219ff38bceddf2d2a88a"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/1819f82dee766c58295ecaacdac02cdf6837d7a4"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/1853e95c9bfe69ef1dd862b3f551e68f4a1b76cc"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/840bb9c49c3e75fb32b593d67ab32f6b77122262"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/9a2d87db3898b5993b64fd258d0334e0eba9ee0d"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/8e85d50ba1117fd446bf9a250bd8a97d48384bdc"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-19T16:47:12Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.1,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - Exploitation requires a local write() to binfmt_misc/register via bm_register_write()->create_entry(); the path is a VFS syscall on a mounted filesystem, not any network protocol or remote packet handler.\nAC:L - An attacker fully controls the registration string and can deterministically choose delimiter P/O/C/F with empty flags so check_special_flags() consumes padding and reads past the kmalloc buffer on every attempt; no race or victim-specific state is required.\nPR:L - binfmt_misc has FS_USERNS_MOUNT; an unprivileged local user can unshare a user namespace, mount binfmt_misc, and write register without init-namespace root, matching the fix commit's stated unprivileged reachability.\nUI:N - Triggering is entirely attacker-driven through mounting binfmt_misc and writing a crafted registration string; no victim must open files, click links, or perform any interactive action beyond the attacker's own syscalls.\nS:U - The slab out-of-bounds read and any disclosed kernel data remain within the host kernel security authority; this is standard local kernel memory access, not a VM escape, IOMMU bypass, or sandbox boundary crossing.\nC:H - check_special_flags() scans past buf+count+8 through adjacent kmalloc/slab memory until a non-P/O/C/F byte, a classic out-of-bounds read that can disclose kernel pointers and other sensitive heap contents for KASLR defeat.\nI:N - The defect is read-only: check_special_flags() only dereferences bytes beyond the allocation and sets flags on the soon-freed Node; it performs no out-of-bounds write, metadata corruption, or control-flow hijack primitive.\nA:H - The unbounded flag scan can walk into an unmapped page and fault the kernel; KASAN reports slab-out-of-bounds, and the single write() to register is trivially repeatable for denial-of-service."
    }
  }
}