What’s Vulnerable › Vulnerabilities

CVE-2025-40019: crypto: essiv - Check ssize for decryption and in-place encryption

• Severity: unknown
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-10-24 · updated 2026-10-19

Description

In the Linux kernel, the following vulnerability has been resolved: crypto: essiv - Check ssize for decryption and in-place encryption Move the ssize check to the start in essiv_aead_crypt so that it's also checked for decryption and in-place encryption.

Affected products

• Linux kernel: 5.4 — fixed in 6.18

How to fix

Upgrade to a fixed version: Linux kernel 6.18. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/248ff2797ff52a8cbf86507f9583437443bf7685
• https://git.kernel.org/stable/c/29294dd6f1e7acf527255fb136ffde6602c3a129
• https://git.kernel.org/stable/c/6bb73db6948c2de23e407fe1b7ef94bf02b7529f
• https://git.kernel.org/stable/c/71f03f8f72d9c70ffba76980e78b38c180e61589
• https://git.kernel.org/stable/c/da7afb01ba05577ba3629f7f4824205550644986
• https://git.kernel.org/stable/c/dc4c854a5e7453c465fa73b153eba4ef2a240abe
• https://git.kernel.org/stable/c/df58651968f82344a0ed2afdafd20ecfc55ff548
• https://git.kernel.org/stable/c/f37e7860dc5e94c70b4a3e38a5809181310ea9ac

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