WARNING in pkcs1pad_verify

Status: upstream: reported C repro on 2026/08/16 20:35
Reported-by: syzbot+5bde7e801f46da43adc6@syzkaller.appspotmail.com
First crash: 15d, last: 12d
Bug presence (1)
Date Name Commit Repro Result
2026/08/30 upstream (ToT) 08dbfad3f504 C Didn't crash
Similar bugs (2)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
android-6-12 WARNING in pkcs1pad_verify -1 syz, C 48 1d00h 15d 0/1 premoderation: reported C repro on 2026/08/16 20:22
linux-5.15 WARNING in pkcs1pad_verify -1 syz, C 4 13d 15d 0/3 upstream: reported C repro on 2026/08/16 20:46

Sample crash report:
------------[ cut here ]------------
WARNING: CPU: 1 PID: 4414 at crypto/rsa-pkcs1pad.c:540 pkcs1pad_verify+0x4a4/0x600 crypto/rsa-pkcs1pad.c:540
Modules linked in:
CPU: 1 PID: 4414 Comm: syz.0.11 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:pkcs1pad_verify+0x4a4/0x600 crypto/rsa-pkcs1pad.c:540
Code: 89 df 89 ee 48 83 c4 28 5b 41 5c 41 5d 41 5e 41 5f 5d e9 bf 0d 00 00 e8 7a b4 a0 fd 0f 0b bd ea ff ff ff eb c4 e8 6c b4 a0 fd <0f> 0b bd ea ff ff ff eb b6 89 f9 80 e1 07 80 c1 03 38 c1 0f 8c 96
RSP: 0018:ffffc9000477f7c0 EFLAGS: 00010283
RAX: ffffffff83e179b4 RBX: ffff888074311600 RCX: 0000000000080000
RDX: ffffc9000c7c9000 RSI: 0000000000001119 RDI: 000000000000111a
RBP: ffffc9000477fa90 R08: ffffc9000477f917 R09: ffffc9000477f908
R10: dffffc0000000000 R11: fffff520008eff23 R12: dffffc0000000000
R13: ffff888029bd4400 R14: ffff888074311638 R15: 0000000000000000
FS:  00007f5241f9c6c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f52411eb7c0 CR3: 0000000028363000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 crypto_akcipher_verify include/crypto/akcipher.h:370 [inline]
 public_key_verify_signature+0x888/0xd20 crypto/asymmetric_keys/public_key.c:460
 asymmetric_key_verify_signature+0x177/0x220 crypto/asymmetric_keys/asymmetric_type.c:614
 keyctl_pkey_verify+0x40e/0x430 security/keys/keyctl_pkey.c:326
 __do_sys_keyctl security/keys/keyctl.c:2017 [inline]
 __se_sys_keyctl+0x605/0x870 security/keys/keyctl.c:1886
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f524119e0d9
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f5241f9c028 EFLAGS: 00000246 ORIG_RAX: 00000000000000fa
RAX: ffffffffffffffda RBX: 00007f5241425fa0 RCX: 00007f524119e0d9
RDX: 0000200000000040 RSI: 0000200000000000 RDI: 000000000000001c
RBP: 00007f5241235024 R08: 0000200000000440 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f5241426038 R14: 00007f5241425fa0 R15: 00007ffeb43a0018
 </TASK>

Crashes (13):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/08/19 16:12 linux-6.1.y e4f7d8be268e 1e72964b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in pkcs1pad_verify
2026/08/19 16:09 linux-6.1.y e4f7d8be268e 1e72964b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in pkcs1pad_verify
2026/08/18 10:23 linux-6.1.y e4f7d8be268e 1e72964b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in pkcs1pad_verify
2026/08/18 10:22 linux-6.1.y e4f7d8be268e 1e72964b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in pkcs1pad_verify
2026/08/17 07:30 linux-6.1.y e4f7d8be268e 746171ee .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in pkcs1pad_verify
2026/08/17 07:30 linux-6.1.y e4f7d8be268e 746171ee .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in pkcs1pad_verify
2026/08/18 10:39 linux-6.1.y e4f7d8be268e 1e72964b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING in pkcs1pad_verify
2026/08/18 10:38 linux-6.1.y e4f7d8be268e 1e72964b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING in pkcs1pad_verify
2026/08/16 21:20 linux-6.1.y e4f7d8be268e 746171ee .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING in pkcs1pad_verify
2026/08/16 20:57 linux-6.1.y e4f7d8be268e 746171ee .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING in pkcs1pad_verify
2026/08/16 20:37 linux-6.1.y e4f7d8be268e 746171ee .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING in pkcs1pad_verify
2026/08/16 20:35 linux-6.1.y e4f7d8be268e 746171ee .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING in pkcs1pad_verify
2026/08/16 20:35 linux-6.1.y e4f7d8be268e 746171ee .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING in pkcs1pad_verify
* Struck through repros no longer work on HEAD.