CVE-2024-26800: Linux Kernel

High severity, CVSS 7.8. EPSS: 0.7% chance of exploitation in the next 30 days.

In the Linux kernel, the following vulnerability has been resolved: tls: fix use-after-free on failed backlog decryption When the decrypt request goes to the backlog and crypto_aead_decrypt returns -EBUSY, tls_do_decryption will wait until all async decryptions have completed. If one of them fails, tls_do_decryption will return -EBADMSG and tls_decrypt_sg jumps to the error path, releasing all the pages. But the pages have been passed to the async callback, and have already been released by tls_decrypt_done. The only true async case is when crypto_aead_decrypt returns -EINPROGRESS. With -EBUSY, we already waited so we can tell tls_sw_recvmsg that the data is available for immediate copy, but we need to notify tls_decrypt_sg (via the new ->async_done flag) that the memory has already been released.

Affected products

• Linux Linux Kernel: from 5.15.160, before 5.16 (fixed in 5.16); from 6.6.18, before 6.6.21 (fixed in 6.6.21); from 6.7.6, before 6.7.9 (fixed in 6.7.9); version 6.8 only

Published 2024-04-04. Last modified 2026-08-04.