What’s Vulnerable › Vulnerabilities

CVE-2023-53373: crypto: seqiv - Handle EBUSY correctly

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-09-18 · updated 2026-06-17
• Weakness: CWE-416

Description

In the Linux kernel, the following vulnerability has been resolved: crypto: seqiv - Handle EBUSY correctly As it is seqiv only handles the special return value of EINPROGERSS, which means that in all other cases it will free data related to the request. However, as the caller of seqiv may specify MAY_BACKLOG, we also need to expect EBUSY and treat it in the same way. Otherwise backlogged requests will trigger a use-after-free.

Affected products

• Linux kernel: from 2.6.25 before 4.14.308; from 4.15 before 4.19.276; from 4.20 before 5.4.235; from 5.5 before 5.10.173; from 5.11 before 5.15.99; from 5.16 before 6.1.16 — fixed in 4.14.308, 4.19.276, 5.10.173, 5.15.99, 5.4.235, 6.1.16

How to fix

Upgrade to a fixed version: Linux kernel 4.14.308, 4.19.276, 5.10.173, 5.15.99. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/1effbddaff60eeef8017c6dea1ee0ed970164d14
• https://git.kernel.org/stable/c/32e62025e5e52fbe4812ef044759de7010b15dbc
• https://git.kernel.org/stable/c/36ec108b7bd7e280edb22de028467bd09d644620
• https://git.kernel.org/stable/c/4d497e8b200a175094e0ac252ed878add39b8771
• https://git.kernel.org/stable/c/63551e4b7cbcd9914258827699eb2cb6ed6e4a16
• https://git.kernel.org/stable/c/9477db935eb690f697d9bcc4f608927841bc8b36
• https://git.kernel.org/stable/c/ae849d2f48019ff9c104e32bf588ccbfb200e971
• https://git.kernel.org/stable/c/cc4d0d4251748a8a68026938f4055d2ac47c5719

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