f2fs: validate compress cache inode only when enabled

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-63817
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-19 12:16:54 UTC
Updated2026-07-20 15:16:48 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: f2fs: validate compress cache inode only when enabled F2FS_COMPRESS_INO() uses NM_I(sbi)->max_nid as the synthetic inode number for the compressed page cache inode. That inode only exists when the compress_cache mount option is enabled. When compress_cache is disabled, max_nid is outside the valid inode range. A corrupted directory entry that points to ino == max_nid should therefore be rejected by f2fs_check_nid_range(). However, is_meta_ino() currently treats F2FS_COMPRESS_INO() as a meta inode unconditionally, so f2fs_iget() bypasses do_read_inode() and its nid range check, and instantiates a fake internal inode instead. Gate the compressed cache inode case on COMPRESS_CACHE, matching f2fs_init_compress_inode(). With compress_cache disabled, ino == max_nid now follows the normal inode path and is rejected as an out-of-range nid.

Risk And Classification

Primary CVSS: v3.1 7.8 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS: 0.001690000 probability, percentile 0.065840000 (date 2026-07-20)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 6ce19aff0b8cd386860855185c6cd79337fc4d2b 29115b8c9172d34e67ab26cc4f6c209b7a236d7a git Not specified
CNA Linux Linux affected 6ce19aff0b8cd386860855185c6cd79337fc4d2b 13e4b59d3a9413f66f116fa6c4828519b960a5ea git Not specified
CNA Linux Linux affected 6ce19aff0b8cd386860855185c6cd79337fc4d2b 16161444c30d8dff9428abbae42b72ce4e32a932 git Not specified
CNA Linux Linux affected 6ce19aff0b8cd386860855185c6cd79337fc4d2b 77f216ff9ce5cde8eed9f6d12707e906dffdc9f7 git Not specified
CNA Linux Linux affected 6ce19aff0b8cd386860855185c6cd79337fc4d2b 0969926d987bbde9a1aa49da317582ba37095805 git Not specified
CNA Linux Linux affected 6ce19aff0b8cd386860855185c6cd79337fc4d2b 5073c66a96a9c23c0c2533ed4ed06e42f9021208 git Not specified
CNA Linux Linux affected a23706426da9b611be5beae0f3faa260fb453b4e git Not specified
CNA Linux Linux affected 5.13.19 5.14 semver Not specified
CNA Linux Linux affected 5.14 Not specified
CNA Linux Linux unaffected 5.14 semver Not specified
CNA Linux Linux unaffected 6.1.177 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.144 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.95 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.38 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.3 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/0969926d987bbde9a1aa49da317582ba37095805 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/16161444c30d8dff9428abbae42b72ce4e32a932 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/77f216ff9ce5cde8eed9f6d12707e906dffdc9f7 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/13e4b59d3a9413f66f116fa6c4828519b960a5ea 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/5073c66a96a9c23c0c2533ed4ed06e42f9021208 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/29115b8c9172d34e67ab26cc4f6c209b7a236d7a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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