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bdu:2025-03676

BELL-CVE-2025-21893

Affected: Alpaquita:25: linux-lts, Alpaquita:stream: linux-lts

certfr-2025-avi-0529 — De multiples vulnérabilités ont été découvertes dans le noyau Linux de SUSE. Certaines d'entre elles permettent à un at…

certfr-2025-avi-0529

EUVD-2026-346702

fkie_cve-2025-21893

In the Linux kernel, the following vulnerability has been resolved:

keys: Fix UAF in key_put()

Once a key's reference count has been reduced to 0, the garbage collector thread may destroy it at any time and so key_put() is not allowed to touch the key after that point. The most key_put() is normally allowed to do is to touch key_gc_work as that's a static global variable.

However, in an effort to speed up the reclamation of quota, this is now done in key_put() once the key's usage is reduced to 0 - but now the code is looking at the key after the deadline, which is forbidden.

Fix this by using a flag to indicate that a key can be gc'd now rather than looking at the key's refcount in the garbage collector.

GHSA-prxc-p2g7-m92v

In the Linux kernel, the following vulnerability has been resolved:

keys: Fix UAF in key_put()

Fix this by using a flag to indicate that a key can be gc'd now rather than looking at the key's refcount in the garbage collector.

RHSA-2025:9079 — Red Hat Security Advisory: kernel security update

kernel: ndisc: use RCU protection in ndisc_alloc_skb() kernel: ovl: fix UAF in ovl_dentry_update_reval by moving dput() in ovl_link_up kernel: keys: Fix UAF in key_put() kernel: cifs: Fix integer overflow while processing closetimeo mount option kernel: cifs: Fix integer overflow while processing acdirmax mount option kernel: Bluetooth: L2CAP: Fix slab-use-after-free Read in l2cap_send_cmd kernel: wifi: cfg80211: cancel wiphy_work before freeing wiphy kernel: smb: client: fix UAF in decryption with multichannel

UBUNTU-CVE-2025-21893

Affected: Ubuntu:16.04:LTS: linux-hwe-edge, Ubuntu:18.04:LTS: linux-aws-5.0, Ubuntu:18.04:LTS: linux-aws-5.3, Ubuntu:18.04:LTS: linux-azure, Ubuntu:18.04:LTS: linux-azure-5.3, Ubuntu:18.04:LTS: linux-azure-edge, Ubuntu:18.04:LTS: linux-gcp, Ubuntu:18.04:LTS: linux-gcp-5.3, Ubuntu:18.04:LTS: linux-gke-4.15, Ubuntu:18.04:LTS: linux-gke-5.4 and 76 more

In the Linux kernel, the following vulnerability has been resolved: keys: Fix UAF in key_put() Once a key's reference count has been reduced to 0, the garbage collector thread may destroy it at any time and so key_put() is not allowed to touch the key after that point. The most key_put() is normally allowed to do is to touch key_gc_work as that's a static global variable. However, in an effort to speed up the reclamation of quota, this is now done in key_put() once the key's usage is reduced to 0 - but now the code is looking at the key after the deadline, which is forbidden. Fix this by using a flag to indicate that a key can be gc'd now rather than looking at the key's refcount in the garbage collector.

WID-SEC-W-2025-0672 — Linux Kernel: Schwachstelle ermöglicht Denial of Service

Ein lokaler Angreifer kann eine Schwachstelle in Linux Kernel ausnutzen, um einen Denial of Service Angriff durchzuführen.