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Revert CVE-2026-31431 ("copy fail") mitigations when EL 9 kernel is updated #13303

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opened 2026-04-30 21:00:16 +00:00 by adamwill · 2 comments
adamwill commented 2026-04-30 21:00:16 +00:00
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Description of request

To address CVE-2026-31431 (the so-called "copy fail" local root privilege escalation issue) on sensitive hosts running EL 9, we implemented a kernel arg workaround suggested by jforbes:

grubby --update-kernel /boot/vmlinuz-5.14.0-611.49.1.el9_7.x86_64 --args="initcall_blacklist=algif_aead_init"

since there is no fixed kernel available for EL 9 yet. Once there is a fixed kernel available, we should update the affected hosts to it, drop the initcall_blacklist=algif_aead_init workaround, and reboot them, I guess.

Hosts we did this on:

  • bastion01
  • bastion02
  • batcave01
  • people01
### Description of request To address CVE-2026-31431 (the so-called "copy fail" local root privilege escalation issue) on sensitive hosts running EL 9, we implemented a kernel arg workaround suggested by jforbes: ``` grubby --update-kernel /boot/vmlinuz-5.14.0-611.49.1.el9_7.x86_64 --args="initcall_blacklist=algif_aead_init" ``` since there is no fixed kernel available for EL 9 yet. Once there *is* a fixed kernel available, we should update the affected hosts to it, drop the `initcall_blacklist=algif_aead_init` workaround, and reboot them, I guess. Hosts we did this on: * bastion01 * bastion02 * batcave01 * people01
kevin commented 2026-05-05 22:44:08 +00:00
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Applying the cmdline to just that one kernel means it won't apply to the updated one. :)

I just applied updates (including the patched kernel) on all those, so they should be ready to go back to normal after the next reboot.

Applying the cmdline to just that one kernel means it won't apply to the updated one. :) I just applied updates (including the patched kernel) on all those, so they should be ready to go back to normal after the next reboot.
kevin closed this issue 2026-05-05 22:44:08 +00:00
kevin self-assigned this 2026-05-05 22:44:13 +00:00
adamwill commented 2026-05-05 23:48:11 +00:00
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Ah, nice, I wasn't sure if the args would be inherited by the newly installed kernel.

Ah, nice, I wasn't sure if the args would be inherited by the newly installed kernel.
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