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CVE-2023-2235 — Use-after-free in Linux kernel's Performance Events subsystem

2026-10-04T21:57:34.107146+00:00

Affected: Linux Kernel

A use-after-free vulnerability in the Linux Kernel Performance Events system can be exploited to achieve local privilege escalation.

The perf_group_detach function did not check the event's siblings' attach_state before calling add_event_to_groups(), but remove_on_exec made it possible to call list_del_event() on before detaching from their group, making it possible to use a dangling pointer causing a use-after-free vulnerability.

We recommend upgrading past commit fd0815f632c24878e325821943edccc7fde947a2.

RHSA-2023:3705 — Red Hat Security Advisory: kpatch-patch security update

2026-10-04T21:57:34.107228+00:00

kernel: use-after-free vulnerability in the perf_group_detach function of the Linux Kernel Performance Events kernel: netfilter: use-after-free in nf_tables when processing batch requests can lead to privilege escalation

RHSA-2023:3723 — Red Hat Security Advisory: kernel security and bug fix update

2026-10-04T21:57:34.107254+00:00

Kernel: bluetooth: Unauthorized management command execution kernel: OOB access in the Linux kernel's XFS subsystem kernel: i2c: out-of-bounds write in xgene_slimpro_i2c_xfer() kernel: use-after-free vulnerability in the perf_group_detach function of the Linux Kernel Performance Events kernel: tls: race condition in do_tls_getsockopt may lead to use-after-free or NULL pointer dereference kernel: netfilter: use-after-free in nf_tables when processing batch requests can lead to privilege escalation kernel: crypto: qat - fix out-of-bounds read