bpf: Disable preemption in bpf_event_output

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2023-54173
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2025-12-30 13:16:05 UTC
Updated2026-10-15 22:17:54 UTC
DescriptionIn 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

Risk And Classification

Primary CVSS: v3.1 7.8 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS: 0.001340000 probability, percentile 0.032780000 (date 2026-08-06)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 2a916f2f546ca1c1e3323e2a4269307f6d9890eb 3048cb0dc0cc9dc74ed93690dffef00733bcad5b git Not specified
CNA Linux Linux affected 2a916f2f546ca1c1e3323e2a4269307f6d9890eb c81bdf8f9f2b002d217c3d5357cdea9f2b82ff90 git Not specified
CNA Linux Linux affected 2a916f2f546ca1c1e3323e2a4269307f6d9890eb 36dd8ca330b76585640ed32255a3c99f901e1502 git Not specified
CNA Linux Linux affected 2a916f2f546ca1c1e3323e2a4269307f6d9890eb 063c9ce8e74e07bf94f99cd13146f42867875e8b git Not specified
CNA Linux Linux affected 2a916f2f546ca1c1e3323e2a4269307f6d9890eb d62cc390c2e99ae267ffe4b8d7e2e08b6c758c32 git Not specified
CNA Linux Linux affected 5.7 Not specified
CNA Linux Linux unaffected 5.7 semver Not specified
CNA Linux Linux unaffected 5.10.190 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.126 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.45 6.1.* semver Not specified
CNA Linux Linux unaffected 6.4.10 6.4.* semver Not specified
CNA Linux Linux unaffected 6.5 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/36dd8ca330b76585640ed32255a3c99f901e1502 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/c81bdf8f9f2b002d217c3d5357cdea9f2b82ff90 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/3048cb0dc0cc9dc74ed93690dffef00733bcad5b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/063c9ce8e74e07bf94f99cd13146f42867875e8b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/d62cc390c2e99ae267ffe4b8d7e2e08b6c758c32 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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