EUVD-2026-75101
GHSA-v3j5-mp2x-9859
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Recovering freed slab data requires local kernel memory access via crash dump or chained disclosure bug, making AV:L/AC:H/PR:L far more accurate than the assigned AV:N/PR:N.
Primary rating from Vendor (Linux).
CVSS VectorVendor: Linux
Lifecycle Timeline
5DescriptionCVE.org
In the Linux kernel, the following vulnerability has been resolved:
crypto: krb5 - use kfree_sensitive() for derived key buffers
crypto_krb5_prepare_encryption() and crypto_krb5_prepare_checksum() free the buffer holding the freshly derived keys with plain kfree(), leaving the key material behind in the freed slab object.
Articles & Coverage 1
AnalysisAI
The krb5 crypto subsystem in the Linux kernel fails to zero derived Kerberos key material before freeing memory buffers, leaving sensitive cryptographic keys resident in freed slab allocator objects. Both crypto_krb5_prepare_encryption() and crypto_krb5_prepare_checksum() call plain kfree() instead of the security-aware kfree_sensitive() wrapper, which would first zero the allocation. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The vulnerable code path is only exercised when Kerberos-authenticated kernel crypto services are active - specifically NFSv4 mounts configured with `sec=krb5`, `sec=krb5i`, or `sec=krb5p`, or CIFS/SMB shares using Kerberos authentication at the kernel level. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The formally assigned CVSS vector AV:N/AC:L/PR:N/UI:N/S:U/C:H scores 7.5 but substantially overstates exploitability for this vulnerability class. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | The primary fix is to upgrade to Linux kernel 6.18.49, 7.1.13, 7.2.3, or 7.3-rc1, each of which incorporates the one-line change replacing `kfree()` with `kfree_sensitive()` for the affected key buffers. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify all systems running affected Linux kernel versions (commit 3936f02b and later) with NFSv4 sec=krb5 or CIFS/SMB Kerberos authentication enabled by auditing kernel versions and filesystem mount options. …
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