vulntracker.iovulntracker.io
© 2026 vulntracker.io

CVE-2023-54173

bpf: Disable preemption in bpf_event_output

HIGH
7.8
CVSS Score
Published: December 30, 2025 at 12:08 PM UTC
Updated: October 15, 2026 at 10:17 PM UTC
1 product affected across 1 vendorLinux Kernel

Using Linux by Linux?

Get instant alerts when new vulnerabilities affect Linux - before attackers find them.

Real-time alertsTrack your software stackFree plan available
Start FreeSign In
Severity
HIGH7.8
Exploit prediction
EPSS 0.2%
SSVC
No known exploit

Description

In the Linux kernel, the following vulnerability has been resolved: bpf: Disable preemption in bpf_event_output We received report [1] of kernel crash, which is caused by using nesting protection without disabled preemption. The bpf_event_output can be called by programs executed by bpf_prog_run_array_cg function that disabled migration but keeps preemption enabled. This can cause task to be preempted by another one inside the nesting protection and lead eventually to two tasks using same perf_sample_data buffer and cause crashes like: BUG: kernel NULL pointer dereference, address: 0000000000000001 #PF: supervisor instruction fetch in kernel mode #PF: error_code(0x0010) - not-present page ... ? perf_output_sample+0x12a/0x9a0 ? finish_task_switch.isra.0+0x81/0x280 ? perf_event_output+0x66/0xa0 ? bpf_event_output+0x13a/0x190 ? bpf_event_output_data+0x22/0x40 ? bpf_prog_dfc84bbde731b257_cil_sock4_connect+0x40a/0xacb ? xa_load+0x87/0xe0 ? __cgroup_bpf_run_filter_sock_addr+0xc1/0x1a0 ? release_sock+0x3e/0x90 ? sk_setsockopt+0x1a1/0x12f0 ? udp_pre_connect+0x36/0x50 ? inet_dgram_connect+0x93/0xa0 ? __sys_connect+0xb4/0xe0 ? udp_setsockopt+0x27/0x40 ? __pfx_udp_push_pending_frames+0x10/0x10 ? __sys_setsockopt+0xdf/0x1a0 ? __x64_sys_connect+0xf/0x20 ? do_syscall_64+0x3a/0x90 ? entry_SYSCALL_64_after_hwframe+0x72/0xdc Fixing this by disabling preemption in bpf_event_output. [1] https://github.com/cilium/cilium/issues/26756

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Linux Kernel· Linux
90%
2a916f2f546ca1c1e3323e2a4269307f6d9890eb5.7
Vendor states this is fixed in 063c9ce8e74e07bf94f99cd13146f42867875e8b (fixed)
Vendor states this is fixed in 3048cb0dc0cc9dc74ed93690dffef00733bcad5b (fixed)
Vendor states this is fixed in 36dd8ca330b76585640ed32255a3c99f901e1502 (fixed)
Vendor states this is fixed in c81bdf8f9f2b002d217c3d5357cdea9f2b82ff90 (fixed)
Vendor states this is fixed in d62cc390c2e99ae267ffe4b8d7e2e08b6c758c32 (fixed)
Vendor states this is fixed in 5.10.190 (unaffected)
Vendor states this is fixed in 5.15.126 (unaffected)
Vendor states this is fixed in 5.7 (unaffected)
Vendor states this is fixed in 6.1.45 (unaffected)
Vendor states this is fixed in 6.4.10 (unaffected)
Vendor states this is fixed in 6.5 (unaffected)

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (5)

Source: cverecord
https://git.kernel.org/stable/c/3048cb0dc0cc9dc74ed93690dffef00733bcad5b
Source: cverecord
https://git.kernel.org/stable/c/c81bdf8f9f2b002d217c3d5357cdea9f2b82ff90
Source: cverecord
https://git.kernel.org/stable/c/36dd8ca330b76585640ed32255a3c99f901e1502
Source: cverecord
https://git.kernel.org/stable/c/063c9ce8e74e07bf94f99cd13146f42867875e8b
Source: cverecord
https://git.kernel.org/stable/c/d62cc390c2e99ae267ffe4b8d7e2e08b6c758c32

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.8HIGHLinux
Vector?

Quick Info

StatusDEFERRED

Get alerted

Stop reading CVE feeds looking for your own stack

Track the products you run and VulnTracker tells you when a new CVE affects them — with what is known about fixing it, and nothing about the rest.

Create accountSign in
Free plan, no card