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CVE-2025-68264 (GCVE-0-2025-68264)

Vulnerability from cvelistv5 – Published: 2025-12-16 14:45 – Updated: 2026-09-08 08:43
VLAI
Title
ext4: refresh inline data size before write operations
Summary
In the Linux kernel, the following vulnerability has been resolved: ext4: refresh inline data size before write operations The cached ei->i_inline_size can become stale between the initial size check and when ext4_update_inline_data()/ext4_create_inline_data() use it. Although ext4_get_max_inline_size() reads the correct value at the time of the check, concurrent xattr operations can modify i_inline_size before ext4_write_lock_xattr() is acquired. This causes ext4_update_inline_data() and ext4_create_inline_data() to work with stale capacity values, leading to a BUG_ON() crash in ext4_write_inline_data(): kernel BUG at fs/ext4/inline.c:1331! BUG_ON(pos + len > EXT4_I(inode)->i_inline_size); The race window: 1. ext4_get_max_inline_size() reads i_inline_size = 60 (correct) 2. Size check passes for 50-byte write 3. [Another thread adds xattr, i_inline_size changes to 40] 4. ext4_write_lock_xattr() acquires lock 5. ext4_update_inline_data() uses stale i_inline_size = 60 6. Attempts to write 50 bytes but only 40 bytes actually available 7. BUG_ON() triggers Fix this by recalculating i_inline_size via ext4_find_inline_data_nolock() immediately after acquiring xattr_sem. This ensures ext4_update_inline_data() and ext4_create_inline_data() work with current values that are protected from concurrent modifications. This is similar to commit a54c4613dac1 ("ext4: fix race writing to an inline_data file while its xattrs are changing") which fixed i_inline_off staleness. This patch addresses the related i_inline_size staleness issue.
Severity
No CVSS data available.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-06-16 16:56 UTC
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 67cf5b09a46f72e048501b84996f2f77bc42e947 , < 54ab81ae5f218452e64470cd8a8139bb5880fe2b (git)
Affected: 67cf5b09a46f72e048501b84996f2f77bc42e947 , < 43bf001f0fe4e59bba47c897505222f959f4a1cc (git)
Affected: 67cf5b09a46f72e048501b84996f2f77bc42e947 , < 89c2c41f0974e530b2d032c3695095aa0559adb1 (git)
Affected: 67cf5b09a46f72e048501b84996f2f77bc42e947 , < 1687a055a555347b002f406676a1aaae4668f242 (git)
Affected: 67cf5b09a46f72e048501b84996f2f77bc42e947 , < 210ac60a86a3ad2c76ae60e0dc71c34af6e7ea0b (git)
Affected: 67cf5b09a46f72e048501b84996f2f77bc42e947 , < ca43ea29b4c4d2764aec8a26cffcfb677a871e6e (git)
Affected: 67cf5b09a46f72e048501b84996f2f77bc42e947 , < 58df743faf21ceb1880f930aa5dd428e2a5e415d (git)
Affected: 67cf5b09a46f72e048501b84996f2f77bc42e947 , < 892e1cf17555735e9d021ab036c36bc7b58b0e3b (git)
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Linux Linux Affected: 3.8
Unaffected: 0 , < 3.8 (semver)
Unaffected: 5.10.248 , ≤ 5.10.* (semver)
Unaffected: 5.15.198 , ≤ 5.15.* (semver)
Unaffected: 6.1.160 , ≤ 6.1.* (semver)
Unaffected: 6.6.120 , ≤ 6.6.* (semver)
Unaffected: 6.12.62 , ≤ 6.12.* (semver)
Unaffected: 6.17.12 , ≤ 6.17.* (semver)
Unaffected: 6.18.1 , ≤ 6.18.* (semver)
Unaffected: 6.19 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.6 , < * (custom)
guessed Create a notification for this product.
Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP Affected: V3.1.6 , < * (custom)
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Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.6 , < * (custom)
guessed Create a notification for this product.
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    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-06-30T10:18:58+00:00",
      "cve": "CVE-2025-68264",
      "id": "CVE-2025-68264",
      "initial_release_date": "2025-12-16T00:00:00+00:00",
      "product_status:known_affected": "260",
      "product_status:known_not_affected": "14",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: ext4: refresh inline data size before write operations",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-68264.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-11T01:50:38Z",
      "cve": "CVE-2025-68264",
      "id": "CVE-2025-68264",
      "initial_release_date": "2025-12-17T00:24:03Z",
      "product_status:first_fixed": "2",
      "product_status:known_affected": "804",
      "product_status:known_not_affected": "6",
      "product_status:recommended": "332",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2025-68264",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2025-68264.json",
      "version": "44"
    },
    "vulnrichment": {
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data size before write operations\\n\\nThe cached ei-\u003ei_inline_size can become stale between the initial size\\ncheck and when ext4_update_inline_data()/ext4_create_inline_data() use\\nit. Although ext4_get_max_inline_size() reads the correct value at the\\ntime of the check, concurrent xattr operations can modify i_inline_size\\nbefore ext4_write_lock_xattr() is acquired.\\n\\nThis causes ext4_update_inline_data() and ext4_create_inline_data() to\\nwork with stale capacity values, leading to a BUG_ON() crash in\\next4_write_inline_data():\\n\\n  kernel BUG at fs/ext4/inline.c:1331!\\n  BUG_ON(pos + len \u003e EXT4_I(inode)-\u003ei_inline_size);\\n\\nThe race window:\\n1. ext4_get_max_inline_size() reads i_inline_size = 60 (correct)\\n2. Size check passes for 50-byte write\\n3. [Another thread adds xattr, i_inline_size changes to 40]\\n4. ext4_write_lock_xattr() acquires lock\\n5. ext4_update_inline_data() uses stale i_inline_size = 60\\n6. Attempts to write 50 bytes but only 40 bytes actually available\\n7. BUG_ON() triggers\\n\\nFix this by recalculating i_inline_size via ext4_find_inline_data_nolock()\\nimmediately after acquiring xattr_sem. This ensures ext4_update_inline_data()\\nand ext4_create_inline_data() work with current values that are protected\\nfrom concurrent modifications.\\n\\nThis is similar to commit a54c4613dac1 (\\\"ext4: fix race writing to an\\ninline_data file while its xattrs are changing\\\") which fixed i_inline_off\\nstaleness. This patch addresses the related i_inline_size staleness issue.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.248\", \"versionStartIncluding\": \"3.8\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.198\", \"versionStartIncluding\": \"3.8\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.160\", \"versionStartIncluding\": \"3.8\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.120\", \"versionStartIncluding\": \"3.8\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.62\", \"versionStartIncluding\": \"3.8\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.17.12\", \"versionStartIncluding\": \"3.8\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.18.1\", \"versionStartIncluding\": \"3.8\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.19\", \"versionStartIncluding\": \"3.8\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-05-11T21:50:00.951Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2025-68264\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-09-08T08:43:07.015Z\", \"dateReserved\": \"2025-12-16T13:41:40.267Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2025-12-16T14:45:06.268Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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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.


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.