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CVE-2026-74592 (GCVE-0-2026-74592)

Vulnerability from cvelistv5 – Published: 2026-08-22 15:31 – Updated: 2026-08-25 05:40
VLAI
Title
ima: Instantiate file_truncate and path_truncate hooks
Summary
In the Linux kernel, the following vulnerability has been resolved: ima: Instantiate file_truncate and path_truncate hooks Instantiate the file_truncate and path_truncate LSM hooks to reset the action cache flags (IMA_DONE_MASK) as soon as truncation is requested, so the file, based on policy, is re-collected, re-measured, re-audited, and re-appraised on next access.
Severity
8.1 (High)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 3323eec921efd815178a23107ab63588c605c0b2 , < 5f46705d96eb60587aa7035acfcbec977e08d620 (git)
Affected: 3323eec921efd815178a23107ab63588c605c0b2 , < dd21c96a71e876c8df9ec546b885a2c5f47bbb05 (git)
Affected: 3323eec921efd815178a23107ab63588c605c0b2 , < 0baed1fa2184c81e4baf76f445d3faa4b738c8f7 (git)
Affected: 3323eec921efd815178a23107ab63588c605c0b2 , < b80bed5c871a80151351342c065579405ce77145 (git)
guessed Create a notification for this product.
Linux Linux Affected: 2.6.30
Unaffected: 0 , < 2.6.30 (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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Show details on NVD website
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "security/integrity/ima/ima_main.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "lessThan": "5f46705d96eb60587aa7035acfcbec977e08d620",
              "status": "affected",
              "version": "3323eec921efd815178a23107ab63588c605c0b2",
              "versionType": "git"
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              "version": "3323eec921efd815178a23107ab63588c605c0b2",
              "versionType": "git"
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              "versionType": "git"
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          "vendor": "Linux",
          "versions": [
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              "version": "2.6.30"
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "6.12.104",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "6.18.45",
              "versionType": "semver"
            },
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              "status": "unaffected",
              "version": "7.1.9",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "7.2",
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        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.104",
                  "versionStartIncluding": "2.6.30",
                  "vulnerable": true
                },
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              "negate": false,
              "operator": "OR"
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        }
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      "descriptions": [
        {
          "lang": "en",
          "value": "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."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 8.1,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "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\u0027s 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."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-25T05:40:20.017Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/5f46705d96eb60587aa7035acfcbec977e08d620"
        },
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          "url": "https://git.kernel.org/stable/c/dd21c96a71e876c8df9ec546b885a2c5f47bbb05"
        },
        {
          "url": "https://git.kernel.org/stable/c/0baed1fa2184c81e4baf76f445d3faa4b738c8f7"
        },
        {
          "url": "https://git.kernel.org/stable/c/b80bed5c871a80151351342c065579405ce77145"
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      ],
      "title": "ima: Instantiate file_truncate and path_truncate hooks",
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-74592",
    "datePublished": "2026-08-22T15:31:43.419Z",
    "dateReserved": "2026-08-15T05:44:03.919Z",
    "dateUpdated": "2026-08-25T05:40:20.017Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-74592",
      "date": "2026-09-16",
      "epss": "0.00341",
      "percentile": "0.27494"
    },
    "microsoft_vex": {
      "current_release_date": "2026-08-24T14:46:35.000Z",
      "cve": "CVE-2026-74592",
      "id": "msrc_CVE-2026-74592",
      "initial_release_date": "2026-08-24T01:02:05.000Z",
      "product_status:known_affected": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "ima: Instantiate file_truncate and path_truncate hooks",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-74592.json",
      "version": "2"
    },
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-25T08:49:49+00:00",
      "cve": "CVE-2026-74592",
      "id": "CVE-2026-74592",
      "initial_release_date": "2026-08-22T00:00:00+00:00",
      "product_status:known_affected": "260",
      "product_status:known_not_affected": "14",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: ima: Instantiate file_truncate and path_truncate hooks",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-74592.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-15T01:18:16Z",
      "cve": "CVE-2026-74592",
      "id": "CVE-2026-74592",
      "initial_release_date": "2026-08-23T00:06:21Z",
      "product_status:known_affected": "357",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-74592",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-74592.json",
      "version": "6"
    }
  }
}



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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

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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.


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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.