{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-74592",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-74592"
  ],
  "published": "2026-08-22T15:32:12Z",
  "summary": "ima: Instantiate file_truncate and path_truncate hooks",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nima: Instantiate file_truncate and path_truncate hooks\n\nInstantiate the file_truncate and path_truncate LSM hooks to reset the\naction cache flags (IMA_DONE_MASK) as soon as truncation is requested,\nso the file, based on policy, is re-collected, re-measured, re-audited,\nand re-appraised on next access.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N"
    }
  ],
  "affected": [
    {
      "package": {
        "ecosystem": "Raspberry Pi OS:12",
        "name": "linux"
      },
      "versions": [
        "1:6.1.47-1+rpt4"
      ],
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-2712",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v6",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v7",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v7l",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v8",
            "binary_version": "1:6.1.47-1+rpt4"
          }
        ]
      },
      "database_specific": {
        "per_version": {
          "1:6.1.47-1+rpt4": {
            "linux_commit": "655fc658a15ae7a6f37103754adb39ba52a9a14e",
            "upstream_version": "6.1.47",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": null,
            "compiled_filter": false
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-74592"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/5f46705d96eb60587aa7035acfcbec977e08d620"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/dd21c96a71e876c8df9ec546b885a2c5f47bbb05"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/0baed1fa2184c81e4baf76f445d3faa4b738c8f7"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/b80bed5c871a80151351342c065579405ce77145"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-25T05:42:41Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 8.1,
      "cvss_v3_severity": "High",
      "scenario": "AV:N - The missing IMA hook is hit from vfs_truncate() via truncate/ftruncate/O_TRUNC syscalls and from ksmbd vfs_truncate on TCP/445; on IMA-enforced servers a remote SMB client with write access can truncate appraised files without clearing IMA_DONE_MASK, the highest-impact reachable path.\nAC:L - Once IMA policy is active, an attacker with write access can deterministically truncate a target file; security_path_truncate/file_truncate always run before do_truncate, so stale IMA_DONE_MASK persists reliably with no races or special memory layout.\nPR:L - Exploitation requires only standard file write permission (MAY_WRITE) on the target inode\u2014via local truncate/ftruncate or an authenticated ksmbd/NFS client with write ACL\u2014not real root or init-namespace capabilities beyond normal write access to the appraised file.\nUI:N - The attacker directly issues truncate/ftruncate or remote SETATTR/truncate operations; no victim must mount media, open a file, or perform any separate action beyond the attacker's own write/truncate request.\nS:U - The flaw defeats IMA measurement/appraisal caching within the same kernel integrity authority; it does not cross VM, hypervisor, IOMMU, or container sandbox boundaries.\nC:H - Stale IMA_APPRAISED flags let process_measurement() skip re-appraisal on exec/open, so attacker-modified truncated content in hash-appraised executables runs with a cached pass and can access any data reachable by that code.\nI:H - Without clearing IMA_DONE_MASK on truncation, modified file content retains cached IMA_MEASURED/IMA_APPRAISED state and bypasses re-measurement, re-audit, and re-appraisal, defeating the core IMA integrity guarantee for affected files.\nA:N - The bug is a stale-cache integrity bypass with no kernel memory corruption, oops, panic, hang, or deadlock; truncation may change individual file availability but does not inherently crash or deny the host kernel."
    }
  }
}