CVE-2026-31577 (GCVE-0-2026-31577)

Vulnerability from cvelistv5 – Published: 2026-04-24 14:42 – Updated: 2026-06-14 17:42
VLAI
Title
nilfs2: fix NULL i_assoc_inode dereference in nilfs_mdt_save_to_shadow_map
Summary
In the Linux kernel, the following vulnerability has been resolved: nilfs2: fix NULL i_assoc_inode dereference in nilfs_mdt_save_to_shadow_map The DAT inode's btree node cache (i_assoc_inode) is initialized lazily during btree operations. However, nilfs_mdt_save_to_shadow_map() assumes i_assoc_inode is already initialized when copying dirty pages to the shadow map during GC. If NILFS_IOCTL_CLEAN_SEGMENTS is called immediately after mount before any btree operation has occurred on the DAT inode, i_assoc_inode is NULL leading to a general protection fault. Fix this by calling nilfs_attach_btree_node_cache() on the DAT inode in nilfs_dat_read() at mount time, ensuring i_assoc_inode is always initialized before any GC operation can use it.
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: d626fcdabea2258be395a775bdbe09270e9bf73d , < 6637bbcfb59df5b732a79e5ab1a74886a0b93d59 (git)
Affected: d05cc5395e36711edad8bdef6945f138d8a7097b , < 837c7a59fb58f81b0db33848357f6a5d0d1250ad (git)
Affected: e897be17a441fa637cd166fc3de1445131e57692 , < 7902b1df1520a0880bcda7a3704cfacd17905a83 (git)
Affected: e897be17a441fa637cd166fc3de1445131e57692 , < 7318e3549518ce8f14776a489d86488d80d7e2c8 (git)
Affected: e897be17a441fa637cd166fc3de1445131e57692 , < 449ec5fc99f45974525ba9eea16b6670c45cd363 (git)
Affected: e897be17a441fa637cd166fc3de1445131e57692 , < c36e206f302f1ddefed92d09ecbba070e1ae079e (git)
Affected: e897be17a441fa637cd166fc3de1445131e57692 , < 41de342278ae025c99cc8d33648773f05e306cf1 (git)
Affected: e897be17a441fa637cd166fc3de1445131e57692 , < 97fb7afec404912d967a7d4715f37742666b3084 (git)
Affected: e897be17a441fa637cd166fc3de1445131e57692 , < 4a4e0328edd9e9755843787d28f16dd4165f8b48 (git)
Affected: 6c3da8c0a35bbafe359d9166269d5590f29664de (git)
Affected: 605babb979c213737618b1c837e89624e5ab11fd (git)
Affected: 307d021b1a7f33048b624f7aaeaa75e3eae571f1 (git)
Affected: 1829b24a36ca12ca95b96d5478faeff40c17f2b6 (git)
Affected: 5.10.118 , < 5.10.258 (semver)
Affected: 5.15.42 , < 5.15.209 (semver)
Affected: 4.14.296 , < 4.15 (semver)
Affected: 4.19.245 , < 4.20 (semver)
Affected: 5.4.196 , < 5.5 (semver)
Affected: 5.17.10 , < 5.18 (semver)
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Linux Linux Affected: 5.18
Unaffected: 0 , < 5.18 (semver)
Unaffected: 5.10.258 , ≤ 5.10.* (semver)
Unaffected: 5.15.209 , ≤ 5.15.* (semver)
Unaffected: 6.1.175 , ≤ 6.1.* (semver)
Unaffected: 6.6.136 , ≤ 6.6.* (semver)
Unaffected: 6.12.83 , ≤ 6.12.* (semver)
Unaffected: 6.18.24 , ≤ 6.18.* (semver)
Unaffected: 6.19.14 , ≤ 6.19.* (semver)
Unaffected: 7.0.1 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
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    "dateReserved": "2026-03-09T15:48:24.119Z",
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      "date": "2026-09-27",
      "epss": "0.00166",
      "percentile": "0.05237"
    },
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      "cve": "CVE-2026-31577",
      "id": "msrc_CVE-2026-31577",
      "initial_release_date": "2026-04-26T01:04:30.000Z",
      "product_status:fixed": "1",
      "product_status:known_affected": "4",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "nilfs2: fix NULL i_assoc_inode dereference in nilfs_mdt_save_to_shadow_map",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-31577.json",
      "version": "6"
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        "descriptions": [
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            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnilfs2: fix NULL i_assoc_inode dereference in nilfs_mdt_save_to_shadow_map\n\nThe DAT inode\u0027s btree node cache (i_assoc_inode) is initialized lazily\nduring btree operations. However, nilfs_mdt_save_to_shadow_map()\nassumes i_assoc_inode is already initialized when copying dirty pages\nto the shadow map during GC.\n\nIf NILFS_IOCTL_CLEAN_SEGMENTS is called immediately after mount before\nany btree operation has occurred on the DAT inode, i_assoc_inode is\nNULL leading to a general protection fault.\n\nFix this by calling nilfs_attach_btree_node_cache() on the DAT inode\nin nilfs_dat_read() at mount time, ensuring i_assoc_inode is always\ninitialized before any GC operation can use it."
          }
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        "id": "CVE-2026-31577",
        "lastModified": "2026-06-17T10:34:00.707",
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                "attackVector": "LOCAL",
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                "baseScore": 5.5,
                "baseSeverity": "MEDIUM",
                "confidentialityImpact": "NONE",
                "integrityImpact": "NONE",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
                "version": "3.1"
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              "impactScore": 3.6,
              "source": "nvd@nist.gov",
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        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Modified",
        "weaknesses": [
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              {
                "lang": "en",
                "value": "CWE-476"
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            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
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        ]
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    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-06-28T11:56:50+00:00",
      "cve": "CVE-2026-31577",
      "id": "CVE-2026-31577",
      "initial_release_date": "2026-04-24T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: nilfs2: fix NULL i_assoc_inode dereference in nilfs_mdt_save_to_shadow_map",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-31577.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-06-15T01:28:00Z",
      "cve": "CVE-2026-31577",
      "id": "CVE-2026-31577",
      "initial_release_date": "2026-04-25T01:38:58Z",
      "product_status:known_not_affected": "313",
      "product_status:recommended": "4",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-31577",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-31577.json",
      "version": "7"
    }
  }
}



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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.



Related by attack behaviour

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.