High [CVE-2026-63801] fix slab-use-after-free Read in tipc_aead_decrypt_done
This high-severity Red Hat Linux advisory covers CVE-2026-63801 affecting Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9.
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Summary
In the Linux kernel, the following vulnerability has been resolved: tipc: fix slab-use-after-free Read in tipc_aead_decrypt_done tipc_aead_decrypt() goes straight from tipc_bearer_hold(b) to crypto_aead_decrypt(req) without taking a reference on the netns, unlike the encrypt path.
When crypto_aead_decrypt() is offloaded asynchronously (e.g. the SIMD aead wrapper queuing to cryptd), the cryptd worker runs tipc_aead_decrypt_done() later.
If the bearer's netns is torn down in the meantime, cleanup_net() -> tipc_exit_net() -> tipc_crypto_stop() frees the per-netns tipc_crypto, and the completion then reads it: tipc_aead_decrypt_done() dereferences aead->crypto->stats and aead->crypto->net, and tipc_crypto_rcv_complete() dereferences aead->crypto->aead[] and the node table -- reading freed memory.
Affected products named by the advisory: Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9; Shadow Migration Toolkit for Virtualization for RHEL 10; and 1 more.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative. Check it before change work.
Official advisory · high-confidence parse· fetched 7 days ago·verify at source
- kernel-0:6.12.0-211.67.1.el10_2
- kernel-rt-0:4.18.0-553.162.1.rt7.503.el8_10
- kernel-0:4.18.0-553.162.1.el8_10
- kernel-0:5.14.0-687.47.1.el9_8
- RHSA-2026:85321
- RHSA-2026:66324
- RHSA-2026:66325
- RHSA-2026:67150
Official advisory · high-confidence parse· fetched 7 days ago·verify at source
Mitigation
Upgrade to a fixed release: kernel-0:6.12.0-211.67.1.el10_2, kernel-rt-0:4.18.0-553.162.1.rt7.503.el8_10, kernel-0:4.18.0-553.162.1.el8_10, kernel-0:5.14.0-687.47.1.el9_8, RHSA-2026:85321, RHSA-2026:66324. That is the remediation for this advisory.
The vendor advisory may list interim mitigations or workarounds not captured here. Review it before change work.
Official advisory · high-confidence parse· fetched 7 days ago·verify at source
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