CVE-2026-74308

In the Linux kernel, the following vulnerability has been resolved: ext4: fix kernel BUG in ext4_write_inline_data_end When the data=journal mount option is used, the ext4_journalled_write_end() function incorrectly calls ext4_write_inline_data_end() without checking if the EXT4_STATE_MAY_INLINE_DATA flag is still set on the inode. If a previous attempt to convert the inline data to an extent failed (e.g. due to ENOSPC), the EXT4_STATE_MAY_INLINE_DATA flag is cleared, but the EXT4_INODE_INLINE_DATA flag remains set. In this scenario, the next call to ext4_write_begin() will not prepare the inline data xattr for writing, but ext4_journalled_write_end() will incorrectly attempt to write to it, triggering a BUG_ON(pos + len > EXT4_I(inode)->i_inline_size) in ext4_write_inline_data() since i_inline_size was not expanded. Fix this by ensuring that ext4_journalled_write_end() only calls ext4_write_inline_data_end() if the EXT4_STATE_MAY_INLINE_DATA flag is set, mirroring the behavior of ext4_write_end() and ext4_da_write_end().

CVSS

No CVSS.

References

Link	Resource
https://git.kernel.org/stable/c/0ae42b51607240990614e0843f0d3529aaff62cc
https://git.kernel.org/stable/c/260830a9a706f5d335398236fc788ce32f220de1
https://git.kernel.org/stable/c/9808ae9fae996afa942bd963a39c9b1cdeebd0bd
https://git.kernel.org/stable/c/ad09aa45965d3fafaf9963bc78109b73c0f9ac8d
https://git.kernel.org/stable/c/f00f5c0dd55319bc33b76f72c853bda0e0a32eda

Configurations

No configuration.

History

No history.

Information

Published : 2026-08-15 06:22

Updated : 2026-08-17 06:19

NVD link : CVE-2026-74308

Mitre link : CVE-2026-74308

CVE.ORG link : CVE-2026-74308

JSON object : View

Products Affected

No product.

CWE

No CWE.

{"id": "CVE-2026-74308", "cveTags": [], "metrics": {}, "affected": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "affectedData": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "3fdcfb668fd78ec92d9bc2daddf1d41e2a8a30bb", "lessThan": "260830a9a706f5d335398236fc788ce32f220de1", "versionType": "git"}, {"status": "affected", "version": "3fdcfb668fd78ec92d9bc2daddf1d41e2a8a30bb", "lessThan": "9808ae9fae996afa942bd963a39c9b1cdeebd0bd", "versionType": "git"}, {"status": "affected", "version": "3fdcfb668fd78ec92d9bc2daddf1d41e2a8a30bb", "lessThan": "f00f5c0dd55319bc33b76f72c853bda0e0a32eda", "versionType": "git"}, {"status": "affected", "version": "3fdcfb668fd78ec92d9bc2daddf1d41e2a8a30bb", "lessThan": "0ae42b51607240990614e0843f0d3529aaff62cc", "versionType": "git"}, {"status": "affected", "version": "3fdcfb668fd78ec92d9bc2daddf1d41e2a8a30bb", "lessThan": "ad09aa45965d3fafaf9963bc78109b73c0f9ac8d", "versionType": "git"}], "programFiles": ["fs/ext4/inode.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "3.8"}, {"status": "unaffected", "version": "0", "lessThan": "3.8", "versionType": "semver"}, {"status": "unaffected", "version": "6.6.145", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.12.97", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.18.40", "versionType": "semver", "lessThanOrEqual": "6.18.*"}, {"status": "unaffected", "version": "7.1.5", "versionType": "semver", "lessThanOrEqual": "7.1.*"}, {"status": "unaffected", "version": "7.2", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["fs/ext4/inode.c"], "defaultStatus": "affected"}]}], "published": "2026-08-15T06:22:30.653", "references": [{"url": "https://git.kernel.org/stable/c/0ae42b51607240990614e0843f0d3529aaff62cc", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/260830a9a706f5d335398236fc788ce32f220de1", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/9808ae9fae996afa942bd963a39c9b1cdeebd0bd", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/ad09aa45965d3fafaf9963bc78109b73c0f9ac8d", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/f00f5c0dd55319bc33b76f72c853bda0e0a32eda", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "vulnStatus": "Received", "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\next4: fix kernel BUG in ext4_write_inline_data_end\n\nWhen the data=journal mount option is used, the ext4_journalled_write_end()\nfunction incorrectly calls ext4_write_inline_data_end() without checking\nif the EXT4_STATE_MAY_INLINE_DATA flag is still set on the inode.\n\nIf a previous attempt to convert the inline data to an extent failed (e.g.\ndue to ENOSPC), the EXT4_STATE_MAY_INLINE_DATA flag is cleared, but\nthe EXT4_INODE_INLINE_DATA flag remains set. In this scenario, the next\ncall to ext4_write_begin() will not prepare the inline data xattr for\nwriting, but ext4_journalled_write_end() will incorrectly attempt to write\nto it, triggering a BUG_ON(pos + len > EXT4_I(inode)->i_inline_size) in\next4_write_inline_data() since i_inline_size was not expanded.\n\nFix this by ensuring that ext4_journalled_write_end() only calls\next4_write_inline_data_end() if the EXT4_STATE_MAY_INLINE_DATA flag is\nset, mirroring the behavior of ext4_write_end() and ext4_da_write_end()."}], "lastModified": "2026-08-17T06:19:24.997", "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}