fs: ntfs3: fix infinite loop in attr_load_runs_range on inconsistent metadata

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Summary

CVECVE-2025-71265
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-03-18 11:16:15 UTC
Updated2026-05-20 19:43:23 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: fs: ntfs3: fix infinite loop in attr_load_runs_range on inconsistent metadata We found an infinite loop bug in the ntfs3 file system that can lead to a Denial-of-Service (DoS) condition. A malformed NTFS image can cause an infinite loop when an attribute header indicates an empty run list, while directory entries reference it as containing actual data. In NTFS, setting evcn=-1 with svcn=0 is a valid way to represent an empty run list, and run_unpack() correctly handles this by checking if evcn + 1 equals svcn and returning early without parsing any run data. However, this creates a problem when there is metadata inconsistency, where the attribute header claims to be empty (evcn=-1) but the caller expects to read actual data. When run_unpack() immediately returns success upon seeing this condition, it leaves the runs_tree uninitialized with run->runs as a NULL. The calling function attr_load_runs_range() assumes that a successful return means that the runs were loaded and sets clen to 0, expecting the next run_lookup_entry() call to succeed. Because runs_tree remains uninitialized, run_lookup_entry() continues to fail, and the loop increments vcn by zero (vcn += 0), leading to an infinite loop. This patch adds a retry counter to detect when run_lookup_entry() fails consecutively after attr_load_runs_vcn(). If the run is still not found on the second attempt, it indicates corrupted metadata and returns -EINVAL, preventing the Denial-of-Service (DoS) vulnerability.

Risk And Classification

Primary CVSS: v3.1 5.5 MEDIUM from [email protected]

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

Problem Types: CWE-835

CVSS v3.1 Breakdown

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

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

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected be71b5cba2e6485e8959da7a9f9a44461a1bb074 6f07a590616ff5f57f7c041d98e463fad9e9f763 git Not specified
CNA Linux Linux affected be71b5cba2e6485e8959da7a9f9a44461a1bb074 a89bc96d5abd8a4a8d5d911884ea347efcdf460b git Not specified
CNA Linux Linux affected be71b5cba2e6485e8959da7a9f9a44461a1bb074 af839013c70a24779f9d1afb1575952009312d38 git Not specified
CNA Linux Linux affected be71b5cba2e6485e8959da7a9f9a44461a1bb074 78b61f7eac37a63284774b147f38dd0be6cad43c git Not specified
CNA Linux Linux affected be71b5cba2e6485e8959da7a9f9a44461a1bb074 c0b43c45d45f59e7faad48675a50231a210c379b git Not specified
CNA Linux Linux affected be71b5cba2e6485e8959da7a9f9a44461a1bb074 3c3a6e951b9b53dab2ac460a655313cf04c4a10a git Not specified
CNA Linux Linux affected be71b5cba2e6485e8959da7a9f9a44461a1bb074 4b90f16e4bb5607fb35e7802eb67874038da4640 git Not specified
CNA Linux Linux affected 5.15 Not specified
CNA Linux Linux unaffected 5.15 semver Not specified
CNA Linux Linux unaffected 5.15.202 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.165 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.128 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.75 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.16 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19.6 6.19.* semver Not specified
CNA Linux Linux unaffected 7.0 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/78b61f7eac37a63284774b147f38dd0be6cad43c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/c0b43c45d45f59e7faad48675a50231a210c379b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/3c3a6e951b9b53dab2ac460a655313cf04c4a10a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/4b90f16e4bb5607fb35e7802eb67874038da4640 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/a89bc96d5abd8a4a8d5d911884ea347efcdf460b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/6f07a590616ff5f57f7c041d98e463fad9e9f763 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/af839013c70a24779f9d1afb1575952009312d38 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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