CVE-2025-68264 (GCVE-0-2025-68264)
Vulnerability from cvelistv5
Published
2025-12-16 14:45
Modified
2026-07-14 12:43
Severity ?
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: 67cf5b09a46f72e048501b84996f2f77bc42e947
Version: 67cf5b09a46f72e048501b84996f2f77bc42e947
Version: 67cf5b09a46f72e048501b84996f2f77bc42e947
Version: 67cf5b09a46f72e048501b84996f2f77bc42e947
Version: 67cf5b09a46f72e048501b84996f2f77bc42e947
Version: 67cf5b09a46f72e048501b84996f2f77bc42e947
Version: 67cf5b09a46f72e048501b84996f2f77bc42e947
Version: 67cf5b09a46f72e048501b84996f2f77bc42e947
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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\": \"2026-07-14T12:43:56.126Z\", \"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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