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CVE-2026-31533 is a use-after-free vulnerability in the Linux kernel net/tls subsystem, in the -EBUSY error path of tls_do_encryption(). When crypto_aead_encrypt() returns -EBUSY, the encryption request is queued to the cryptd backlog and tls_encrypt_done() later performs asynchronous cleanup by restoring scatterlist state and decrementing ctx->encrypt_pending. If tls_encrypt_async_wait() returns an error, tls_do_encryption() also performs that cleanup synchronously. This double restoration and double decrement corrupt the encrypt_pending sentinel, causing later operations to bypass waiting for outstanding cryptographic callbacks. A subsequent sendmsg path can free the associated TLS record through the BPF transmit-verdict path while a cryptd callback remains pending; the callback subsequently dereferences the freed record.
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A Linux kernel net/tls use-after-free vulnerability in the -EBUSY error path of tls_do_encryption(), involving a double-decrement of the encrypt_pending sentinel and double scatterlist restore. The content states it was exploited as a 0-day.
A use-after-free vulnerability in the Linux kernel net/tls subsystem's tls_do_encryption() error handling that can cause memory corruption and system instability during TLS encryption processing.
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