Kernel data disclosure and crash via unterminated path
Published May 27, 2026 · Updated May 27, 2026
An out-of-bounds read in Linux kernel 7.0 through 7.0.3 allows local users to disclose kernel heap data or crash the system. AppArmor's aa_bind_mount path handling overwrites the terminating NUL after appending a slash, so aa_dfa_match scans beyond the allocated buffer until another NUL is found. A confined local user can reach the flaw through mount(2) after obtaining namespace-relative CAP_SYS_ADMIN with a user namespace; the overread exposes adjacent heap bytes through audit_mount or triggers a kernel fault.
Summary
What happened
An out-of-bounds read in Linux kernel 7.0 through 7.0.3 allows local users to disclose kernel heap data or crash the system. AppArmor's aa_bind_mount path handling overwrites the terminating NUL after appending a slash, so aa_dfa_match scans beyond the allocated buffer until another NUL is found. A confined local user can reach the flaw through mount(2) after obtaining namespace-relative CAP_SYS_ADMIN with a user namespace; the overread exposes adjacent heap bytes through audit_mount or triggers a kernel fault.
The record
- CVE
- CVE-2026-46055
- Published
- May 27, 2026
- Updated
- May 27, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux Kernel
- Classifications
- T1499
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- May 27, 2026CVE publishedPublication date reported by the CVE source.
- May 27, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=7.0
- Affected versionversion=93d4dbdc8da0b8a3ba86f4a08868084f8da872e1 <4b877ef27adc8ec187b0418629169856e7264e01
- Affected versionversion=93d4dbdc8da0b8a3ba86f4a08868084f8da872e1 <828bf7929bedcb79b560b5b4e44f22abee07d31b
What conditions does exploitation require?
What is affected?
Published CVSS scores
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Attacks
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Public exploit references
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Technologies
Your stack
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Your stack
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