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: 26d, last: now
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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 31d 76d 29/29 fixed on 2026/07/15 08:27
upstream KMSAN: kernel-infoleak in irqentry_exit (2) kernel prio:high 9 11110 26d 27d 29/29 fixed on 2026/07/20 12:16

Sample crash report:
=====================================================
BUG: KMSAN: kernel-infoleak in rseq_set_ids_get_csaddr include/linux/rseq_entry.h:502 [inline]
BUG: KMSAN: kernel-infoleak in rseq_update_usr include/linux/rseq_entry.h:536 [inline]
BUG: KMSAN: kernel-infoleak in rseq_exit_user_update include/linux/rseq_entry.h:645 [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+0x4a6/0xa40 kernel/entry/common.c:165
 rseq_set_ids_get_csaddr include/linux/rseq_entry.h:502 [inline]
 rseq_update_usr include/linux/rseq_entry.h:536 [inline]
 rseq_exit_user_update include/linux/rseq_entry.h:645 [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+0x4a6/0xa40 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 st.i.i created at:
 __do_sys_statfs fs/statfs.c:193 [inline]
 __se_sys_statfs fs/statfs.c:191 [inline]
 __x64_sys_statfs+0x73/0x200 fs/statfs.c:191
 x64_sys_call+0x334c/0x3ea0 arch/x86/include/generated/asm/syscalls_64.h:138

Bytes 0-3 of 4 are uninitialized
Memory access of size 4 starts at ffff8881074a3e78
Data copied to user address 00007fe618b97ac0

CPU: 1 UID: 0 PID: 5322 Comm: dhcpcd-run-hook Not tainted syzkaller #0 PREEMPT(lazy) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
=====================================================

Crashes (56271):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/08/15 23:31 upstream a59f57e2aa12 746171ee .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: kernel-infoleak in irqentry_exit
2026/08/15 23:18 upstream a59f57e2aa12 746171ee .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: kernel-infoleak in irqentry_exit
2026/08/15 23:09 upstream a59f57e2aa12 746171ee .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: kernel-infoleak in irqentry_exit
2026/08/15 22:56 upstream a59f57e2aa12 746171ee .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: kernel-infoleak in irqentry_exit
2026/08/15 22:35 upstream a59f57e2aa12 746171ee .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: kernel-infoleak in irqentry_exit
2026/08/15 22:01 upstream a59f57e2aa12 746171ee .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: kernel-infoleak in irqentry_exit
2026/08/15 21:50 upstream a59f57e2aa12 746171ee .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: kernel-infoleak in irqentry_exit
2026/08/15 21:40 upstream a59f57e2aa12 746171ee .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: kernel-infoleak in irqentry_exit
2026/08/15 21:30 upstream a59f57e2aa12 746171ee .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: kernel-infoleak in irqentry_exit
2026/08/15 21:19 upstream a59f57e2aa12 746171ee .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: kernel-infoleak in irqentry_exit
2026/08/15 21:08 upstream a59f57e2aa12 746171ee .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: kernel-infoleak in irqentry_exit
2026/08/15 20:21 upstream a59f57e2aa12 746171ee .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: kernel-infoleak in irqentry_exit
2026/08/15 19:57 upstream a59f57e2aa12 746171ee .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: kernel-infoleak in irqentry_exit
2026/08/15 19:23 upstream a59f57e2aa12 746171ee .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: kernel-infoleak in irqentry_exit
2026/08/15 18:46 upstream a59f57e2aa12 746171ee .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: kernel-infoleak in irqentry_exit
2026/08/15 18:32 upstream a59f57e2aa12 746171ee .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: kernel-infoleak in irqentry_exit
2026/08/15 18:22 upstream a59f57e2aa12 746171ee .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: kernel-infoleak in irqentry_exit
2026/08/15 18:10 upstream a59f57e2aa12 746171ee .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: kernel-infoleak in irqentry_exit
2026/08/15 17:48 upstream a59f57e2aa12 746171ee .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: kernel-infoleak in irqentry_exit
2026/08/15 17:35 upstream a59f57e2aa12 746171ee .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: kernel-infoleak in irqentry_exit
2026/08/15 17:22 upstream a59f57e2aa12 746171ee .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: kernel-infoleak in irqentry_exit
2026/08/15 17:11 upstream a59f57e2aa12 746171ee .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: kernel-infoleak in irqentry_exit
2026/08/15 16:47 upstream a59f57e2aa12 746171ee .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: kernel-infoleak in irqentry_exit
2026/08/15 16:33 upstream a59f57e2aa12 746171ee .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: kernel-infoleak in irqentry_exit
2026/08/15 15:48 upstream a59f57e2aa12 746171ee .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: kernel-infoleak in irqentry_exit
2026/08/15 15:34 upstream a59f57e2aa12 746171ee .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: kernel-infoleak in irqentry_exit
2026/08/15 15:21 upstream a59f57e2aa12 746171ee .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
2026/08/15 22:45 upstream e05b559f9cda 746171ee .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: kernel-infoleak in irqentry_exit
2026/08/15 22:24 upstream e05b559f9cda 746171ee .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: kernel-infoleak in irqentry_exit
2026/08/15 22:11 upstream e05b559f9cda 746171ee .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: kernel-infoleak in irqentry_exit
2026/08/15 20:56 upstream e05b559f9cda 746171ee .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: kernel-infoleak in irqentry_exit
2026/08/15 20:44 upstream e05b559f9cda 746171ee .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: kernel-infoleak in irqentry_exit
2026/08/15 20:33 upstream e05b559f9cda 746171ee .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: kernel-infoleak in irqentry_exit
2026/08/15 20:08 upstream e05b559f9cda 746171ee .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: kernel-infoleak in irqentry_exit
2026/08/15 19:45 upstream e05b559f9cda 746171ee .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: kernel-infoleak in irqentry_exit
2026/08/15 19:33 upstream e05b559f9cda 746171ee .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: kernel-infoleak in irqentry_exit
2026/08/15 19:12 upstream e05b559f9cda 746171ee .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: kernel-infoleak in irqentry_exit
2026/08/15 18:59 upstream e05b559f9cda 746171ee .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: kernel-infoleak in irqentry_exit
2026/08/15 17:59 upstream e05b559f9cda 746171ee .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: kernel-infoleak in irqentry_exit
2026/08/15 16:59 upstream e05b559f9cda 746171ee .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: kernel-infoleak in irqentry_exit
2026/08/15 16:23 upstream e05b559f9cda 746171ee .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: kernel-infoleak in irqentry_exit
2026/08/15 16:12 upstream e05b559f9cda 746171ee .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: kernel-infoleak in irqentry_exit
2026/08/15 16:00 upstream e05b559f9cda 746171ee .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.