KCSAN: data-race in copy_creds / prepare

ID	Workflow	Result	Correct	Bug	Created	Started	Finished	Revision	Error
75eb4387-642b-409a-99bc-a91ef4a28159	assessment-security	DenialOfService: ❌ Exploitable: ❌ FilesystemTrigger: ❌ NetworkTrigger: ❌ PeripheralTrigger: ❌ RemoteTrigger: ❌ Unprivileged: ✅ UserNamespace: ✅ VMGuestTrigger: ❌ VMHostTrigger: ❌	❓	KCSAN: data-race in copy_creds / prepare_creds (3)	2026/06/25 00:00	2026/06/25 00:00	2026/06/25 00:13	2e5297c5126f27e51eeef9157f2111c5beb11e4f
87611e02-527d-4044-b441-00ff0adc5e55	assessment-kcsan	Benign: ✅	❓	KCSAN: data-race in copy_creds / prepare_creds (3)	2026/06/23 14:39	2026/06/23 14:39	2026/06/23 15:05	e30e5c89d137d970da183ffdc275130a55fdd832

Kernel	Title	Rank 🛈	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	KCSAN: data-race in copy_creds / prepare_creds lsm	6				3	264d	283d	0/29	auto-obsoleted due to no activity on 2025/11/29 06:24
upstream	KCSAN: data-race in copy_creds / prepare_creds (2) lsm prio:high	6				8	91d	206d	0/29	auto-obsoleted due to no activity on 2026/05/21 11:07

Kernel

Title

Rank 🛈

upstream

KCSAN: data-race in copy_creds / prepare_creds lsm

264d

283d

0/29

auto-obsoleted due to no activity on 2025/11/29 06:24

upstream

KCSAN: data-race in copy_creds / prepare_creds (2) lsm prio:high

91d

206d

0/29

auto-obsoleted due to no activity on 2026/05/21 11:07

================================================================== BUG: KCSAN: data-race in copy_creds / prepare_creds write to 0xffff888103fc6b28 of 4 bytes by task 9782 on cpu 0: get_cred_many include/linux/cred.h:222 [inline] copy_creds+0x78/0x340 kernel/cred.c:278 copy_process+0x8b8/0x2350 kernel/fork.c:2148 kernel_clone+0x1c0/0x5f0 kernel/fork.c:2746 __do_sys_clone3 kernel/fork.c:3048 [inline] __se_sys_clone3+0x1f5/0x230 kernel/fork.c:3027 __x64_sys_clone3+0x31/0x40 kernel/fork.c:3027 x64_sys_call+0x580/0x3020 arch/x86/include/generated/asm/syscalls_64.h:436 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x136/0x3c0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f read to 0xffff888103fc6a80 of 184 bytes by task 9783 on cpu 1: prepare_creds+0x71/0x550 kernel/cred.c:192 __do_sys_capset kernel/capability.c:247 [inline] __se_sys_capset+0x2da/0x480 kernel/capability.c:216 __x64_sys_capset+0x31/0x40 kernel/capability.c:216 x64_sys_call+0x2aac/0x3020 arch/x86/include/generated/asm/syscalls_64.h:127 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x136/0x3c0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Reported by Kernel Concurrency Sanitizer on: CPU: 1 UID: 0 PID: 9783 Comm: syz.5.1734 Tainted: G W syzkaller #0 PREEMPT(lazy) Tainted: [W]=WARN Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026 ==================================================================

Crashes (1):
Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	VM info	Assets (help?)	Manager	Title
2026/06/23 14:39	upstream	502d801f0ab0	4b1d8f01	.config	console log	report			info	[disk image] [vmlinux] [kernel image]	ci2-upstream-kcsan-gce	KCSAN: data-race in copy_creds / prepare_creds

Crashes (1):

Assets (help?)