WARNING in pkcs1pad_verify

Status: premoderation: reported C repro on 2026/08/16 20:22
Reported-by: syzbot+c5aaf236690e75994f9a@syzkaller.appspotmail.com
First crash: 4d17h, last: 2d18h
Similar bugs (2)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-5.15 WARNING in pkcs1pad_verify -1 syz, C 4 2d19h 4d17h 0/3 upstream: reported C repro on 2026/08/16 20:46
linux-6.1 WARNING in pkcs1pad_verify -1 syz, C 13 1d22h 4d17h 0/3 upstream: reported C repro on 2026/08/16 20:35

Sample crash report:
------------[ cut here ]------------
WARNING: CPU: 0 PID: 312 at crypto/rsa-pkcs1pad.c:560 pkcs1pad_verify+0x4e4/0x700 crypto/rsa-pkcs1pad.c:560
Modules linked in:
CPU: 0 UID: 0 PID: 312 Comm: syz-executor108 Not tainted syzkaller #0 851f5cb62ab9f9c24538876695daf6a72142c571
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:pkcs1pad_verify+0x4e4/0x700 crypto/rsa-pkcs1pad.c:560
Code: 11 00 00 48 83 c4 20 5b 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc cc e8 4a 6b 06 ff 0f 0b b8 ea ff ff ff eb de e8 3c 6b 06 ff <0f> 0b b8 ea ff ff ff eb d0 89 f9 80 e1 07 80 c1 03 38 c1 0f 8c 5d
RSP: 0018:ffffc9000116f728 EFLAGS: 00010293
RAX: ffffffff82810684 RBX: ffff88810535c800 RCX: ffff88812fa23900
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc9000116f770 R08: ffffc9000116f82f R09: 0000000000000000
R10: 0000000000000000 R11: ffffffff828101a0 R12: ffff888107b43808
R13: 0000000000000000 R14: dffffc0000000000 R15: ffff88810535c838
FS:  000055557b5d73c0(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005618fe4ff000 CR3: 000000012fac0000 CR4: 00000000003526b0
Call Trace:
 <TASK>
 crypto_akcipher_verify include/crypto/akcipher.h:385 [inline]
 crypto_sig_verify+0x1cd/0x260 crypto/sig.c:116
 public_key_verify_signature+0x654/0xa40 crypto/asymmetric_keys/public_key.c:447
 public_key_verify_signature_2+0x47/0x60 crypto/asymmetric_keys/public_key.c:465
 verify_signature+0xf0/0x120 crypto/asymmetric_keys/signature.c:154
 asymmetric_key_verify_signature+0x160/0x200 crypto/asymmetric_keys/asymmetric_type.c:613
 keyctl_pkey_verify+0x203/0x290 security/keys/keyctl_pkey.c:319
 __do_sys_keyctl security/keys/keyctl.c:2005 [inline]
 __se_sys_keyctl+0x743/0xe40 security/keys/keyctl.c:1874
 __x64_sys_keyctl+0xc3/0xf0 security/keys/keyctl.c:1874
 x64_sys_call+0x996/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:251
 do_syscall_x64 arch/x86/entry/common.c:47 [inline]
 do_syscall_64+0x57/0xf0 arch/x86/entry/common.c:78
 entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7faa975cac79
Code: c0 79 93 eb d5 48 8d 7c 1d 00 eb 99 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 d8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffe8a74e4f8 EFLAGS: 00000246 ORIG_RAX: 00000000000000fa
RAX: ffffffffffffffda RBX: 0000200000000000 RCX: 00007faa975cac79
RDX: 0000200000000880 R

Crashes (12):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/08/18 20:00 android16-6.12 8dc5b20ad3ea 1e72964b .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in pkcs1pad_verify
2026/08/17 07:27 android16-6.12 26014f6c6077 746171ee .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in pkcs1pad_verify
2026/08/16 20:53 android16-6.12 26014f6c6077 746171ee .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in pkcs1pad_verify
2026/08/16 20:38 android16-6.12 26014f6c6077 746171ee .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in pkcs1pad_verify
2026/08/18 15:57 android16-6.12 8dc5b20ad3ea 1e72964b .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in pkcs1pad_verify
2026/08/18 15:57 android16-6.12 8dc5b20ad3ea 1e72964b .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in pkcs1pad_verify
2026/08/18 05:47 android16-6.12 83f7e9ec53bb 1e72964b .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in pkcs1pad_verify
2026/08/18 05:47 android16-6.12 83f7e9ec53bb 1e72964b .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in pkcs1pad_verify
2026/08/16 20:23 android16-6.12 26014f6c6077 746171ee .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in pkcs1pad_verify
2026/08/16 20:22 android16-6.12 26014f6c6077 746171ee .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in pkcs1pad_verify
2026/08/16 20:21 android16-6.12 26014f6c6077 746171ee .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in pkcs1pad_verify
2026/08/16 20:21 android16-6.12 26014f6c6077 746171ee .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in pkcs1pad_verify
* Struck through repros no longer work on HEAD.