KMSAN: kernel-infoleak in irqentry_exit (3)

Status: upstream: reported on 2026/07/24 12:25
Subsystems: kernel
Labels: prio:high
[Documentation on labels]
Reported-by: syzbot+fb19c2cd5a21000b7336@syzkaller.appspotmail.com
First crash: 64d, last: 4d13h
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ID Workflow Result Correct Bug Created Started Finished Revision
540792ef assessment-security DenialOfService: ❌ Exploitable: ✅ FilesystemTrigger: ❌ NetworkTrigger: ❌ PeripheralTrigger: ❌ RemoteTrigger: ❌ Unprivileged: ✅ UserNamespace: ❌ VMGuestTrigger: ❌ VMHostTrigger: ❌ ❓ KMSAN: kernel-infoleak in irqentry_exit (3) 2026/07/22 00:01 2026/07/22 00:01 2026/07/22 01:07 0d5a7c31
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[syzbot] [kernel?] KMSAN: kernel-infoleak in irqentry_exit (3) 0 (1) 2026/07/24 12:25
▶ ▼ Similar bugs (2)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KMSAN: kernel-infoleak in irqentry_exit prio:high kernel 9 61732 69d 114d 29/29 fixed on 2026/07/15 08:27
upstream KMSAN: kernel-infoleak in irqentry_exit (2) kernel prio:high 9 11110 64d 65d 29/29 fixed on 2026/07/20 12:16

Sample crash report:
=====================================================
BUG: KMSAN: kernel-infoleak in rseq_exit_user_update include/linux/rseq_entry.h:626 [inline]
BUG: KMSAN: kernel-infoleak in __rseq_exit_to_user_mode_restart include/linux/rseq_entry.h:674 [inline]
BUG: KMSAN: kernel-infoleak in rseq_exit_to_user_mode_restart include/linux/rseq_entry.h:703 [inline]
BUG: KMSAN: kernel-infoleak in exit_to_user_mode_loop kernel/entry/common.c:103 [inline]
BUG: KMSAN: kernel-infoleak in __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline]
BUG: KMSAN: kernel-infoleak in irqentry_exit_to_user_mode_prepare include/linux/irq-entry-common.h:244 [inline]
BUG: KMSAN: kernel-infoleak in irqentry_exit_to_user_mode include/linux/irq-entry-common.h:315 [inline]
BUG: KMSAN: kernel-infoleak in irqentry_exit+0x34f/0xa40 kernel/entry/common.c:165
 rseq_exit_user_update include/linux/rseq_entry.h:626 [inline]
 __rseq_exit_to_user_mode_restart include/linux/rseq_entry.h:674 [inline]
 rseq_exit_to_user_mode_restart include/linux/rseq_entry.h:703 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:103 [inline]
 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline]
 irqentry_exit_to_user_mode_prepare include/linux/irq-entry-common.h:244 [inline]
 irqentry_exit_to_user_mode include/linux/irq-entry-common.h:315 [inline]
 irqentry_exit+0x34f/0xa40 kernel/entry/common.c:165
 exc_page_fault+0x7e/0xb0 arch/x86/mm/fault.c:1539
 asm_exc_page_fault+0x2b/0x30 arch/x86/include/asm/idtentry.h:595

Local variable end_time.i.i created at:
 __do_sys_poll fs/select.c:1063 [inline]
 __se_sys_poll fs/select.c:1060 [inline]
 __x64_sys_poll+0x87/0x540 fs/select.c:1060
 x64_sys_call+0x3130/0x3ea0 arch/x86/include/generated/asm/syscalls_64.h:8

Bytes 0-3 of 4 are uninitialized
Memory access of size 4 starts at ffff88811e9cbe8c
Data copied to user address 00007f48755c2adc

CPU: 1 UID: 0 PID: 4928 Comm: S02sysctl Not tainted syzkaller #0 PREEMPT(lazy) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
=====================================================

Crashes (115238):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/09/07 13:04 upstream a59f57e2aa12 4f7b22a0 .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: kernel-infoleak in irqentry_exit
2026/07/24 11:52 upstream 4a50a141f05a 544adce9 .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: kernel-infoleak in irqentry_exit
2026/07/21 23:43 upstream 4a50a141f05a 7c5de9c3 .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: kernel-infoleak in irqentry_exit
2026/07/20 12:16 upstream 4a50a141f05a de6a700d .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: kernel-infoleak in irqentry_exit
2026/09/18 00:56 upstream ff68e5f557f6 95928915 .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: kernel-infoleak in irqentry_exit
2026/09/18 00:24 upstream ff68e5f557f6 95928915 .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: kernel-infoleak in irqentry_exit
2026/09/17 23:48 upstream ff68e5f557f6 95928915 .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: kernel-infoleak in irqentry_exit
2026/09/17 23:11 upstream ff68e5f557f6 95928915 .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: kernel-infoleak in irqentry_exit
2026/09/17 22:33 upstream ff68e5f557f6 95928915 .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: kernel-infoleak in irqentry_exit
2026/09/17 21:59 upstream ff68e5f557f6 95928915 .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: kernel-infoleak in irqentry_exit
2026/09/17 21:11 upstream ff68e5f557f6 95928915 .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: kernel-infoleak in irqentry_exit
2026/09/17 20:35 upstream ff68e5f557f6 95928915 .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: kernel-infoleak in irqentry_exit
2026/09/17 19:54 upstream ff68e5f557f6 95928915 .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: kernel-infoleak in irqentry_exit
2026/09/17 19:16 upstream ff68e5f557f6 95928915 .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: kernel-infoleak in irqentry_exit
2026/09/17 18:37 upstream ff68e5f557f6 95928915 .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: kernel-infoleak in irqentry_exit
2026/09/17 17:56 upstream ff68e5f557f6 95928915 .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: kernel-infoleak in irqentry_exit
2026/09/17 17:20 upstream ff68e5f557f6 95928915 .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: kernel-infoleak in irqentry_exit
2026/09/17 16:45 upstream ff68e5f557f6 95928915 .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: kernel-infoleak in irqentry_exit
2026/09/17 16:00 upstream ff68e5f557f6 95928915 .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: kernel-infoleak in irqentry_exit
2026/09/17 15:16 upstream ff68e5f557f6 95928915 .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: kernel-infoleak in irqentry_exit
2026/09/17 14:38 upstream ff68e5f557f6 95928915 .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: kernel-infoleak in irqentry_exit
2026/09/17 13:46 upstream ff68e5f557f6 95928915 .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: kernel-infoleak in irqentry_exit
2026/09/17 13:05 upstream ff68e5f557f6 95928915 .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: kernel-infoleak in irqentry_exit
2026/09/17 12:31 upstream ff68e5f557f6 95928915 .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: kernel-infoleak in irqentry_exit
2026/09/17 11:53 upstream ff68e5f557f6 95928915 .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: kernel-infoleak in irqentry_exit
2026/09/17 11:14 upstream ff68e5f557f6 95928915 .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: kernel-infoleak in irqentry_exit
2026/09/17 10:38 upstream ff68e5f557f6 95928915 .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: kernel-infoleak in irqentry_exit
2026/09/17 10:00 upstream ff68e5f557f6 95928915 .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: kernel-infoleak in irqentry_exit
2026/09/17 09:30 upstream ff68e5f557f6 95928915 .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: kernel-infoleak in irqentry_exit
2026/09/17 08:49 upstream ff68e5f557f6 95928915 .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: kernel-infoleak in irqentry_exit
2026/09/17 08:07 upstream ff68e5f557f6 95928915 .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: kernel-infoleak in irqentry_exit
2026/09/17 07:28 upstream ff68e5f557f6 95928915 .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: kernel-infoleak in irqentry_exit
2026/09/17 06:56 upstream ff68e5f557f6 95928915 .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: kernel-infoleak in irqentry_exit
2026/09/17 06:26 upstream ff68e5f557f6 95928915 .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: kernel-infoleak in irqentry_exit
2026/09/17 05:52 upstream ff68e5f557f6 95928915 .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: kernel-infoleak in irqentry_exit
2026/09/17 05:16 upstream ff68e5f557f6 95928915 .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: kernel-infoleak in irqentry_exit
2026/09/17 04:41 upstream ff68e5f557f6 95928915 .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: kernel-infoleak in irqentry_exit
2026/09/17 04:10 upstream ff68e5f557f6 95928915 .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: kernel-infoleak in irqentry_exit
2026/09/17 03:39 upstream ff68e5f557f6 95928915 .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: kernel-infoleak in irqentry_exit
2026/09/17 02:51 upstream ff68e5f557f6 95928915 .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: kernel-infoleak in irqentry_exit
2026/09/17 02:07 upstream ff68e5f557f6 95928915 .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: kernel-infoleak in irqentry_exit
2026/09/17 01:32 upstream ff68e5f557f6 95928915 .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: kernel-infoleak in irqentry_exit
2026/09/17 01:02 upstream ff68e5f557f6 95928915 .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: kernel-infoleak in irqentry_exit
2026/09/17 00:25 upstream ff68e5f557f6 95928915 .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: kernel-infoleak in irqentry_exit
2026/09/16 23:45 upstream ff68e5f557f6 95928915 .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: kernel-infoleak in irqentry_exit
2026/09/16 23:09 upstream ff68e5f557f6 95928915 .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: kernel-infoleak in irqentry_exit
* Struck through repros no longer work on HEAD.