WARNING in pkcs1pad_verify

Status: upstream: reported C repro on 2026/08/16 20:35
Reported-by: syzbot+5bde7e801f46da43adc6@syzkaller.appspotmail.com
First crash: 3d06h, last: 11h08m
▶ ▼ 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 12 1d07h 3d06h 0/1 premoderation: reported C repro on 2026/08/16 20:22
linux-5.15 WARNING in pkcs1pad_verify -1 syz, C 4 1d08h 3d06h 0/3 upstream: reported C repro on 2026/08/16 20:46

Sample crash report:
------------[ cut here ]------------
WARNING: CPU: 1 PID: 4518 at crypto/rsa-pkcs1pad.c:540 pkcs1pad_verify+0x454/0x5ac crypto/rsa-pkcs1pad.c:540
Modules linked in:
CPU: 1 PID: 4518 Comm: syz.0.17 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/07/2026
pstate: 82400005 (Nzcv daif +PAN -UAO +TCO -DIT -SSBS BTYPE=--)
pc : pkcs1pad_verify+0x454/0x5ac crypto/rsa-pkcs1pad.c:540
lr : pkcs1pad_verify+0x454/0x5ac crypto/rsa-pkcs1pad.c:540
sp : ffff800020b97630
x29: ffff800020b97640 x28: ffff0000dc128800 x27: ffff0000cba8a200
x26: ffff0000cba8a200 x25: ffff800020b977c0 x24: dfff800000000000
x23: ffff800020b979a0 x22: 0000000000000000 x21: ffff0000dc128838
x20: 0000000000000200 x19: ffff0000dc128800 x18: 1fffe00033e7697e
x17: ffff80000a76afc4 x16: ffff800011b90080 x15: 8a8992b545d160b9
x14: 0000000000000002 x13: 1ffff00004172eed x12: 0000000000000000
x11: ff0080000a6632a8 x10: 0000000000000000 x9 : ffff80000a6632a8
x8 : ffff0000d4fbb800 x7 : 0000000000000000 x6 : 0000000000000000
x5 : 0000000000000000 x4 : 0000000000000008 x3 : 0000000000000000
x2 : 0000000000000008 x1 : 0000000000000000 x0 : 0000000000000000
Call trace:
 pkcs1pad_verify+0x454/0x5ac crypto/rsa-pkcs1pad.c:540
 crypto_akcipher_verify include/crypto/akcipher.h:370 [inline]
 public_key_verify_signature+0x720/0xb30 crypto/asymmetric_keys/public_key.c:460
 public_key_verify_signature_2+0x48/0x58 crypto/asymmetric_keys/public_key.c:479
 verify_signature+0xe8/0x108 crypto/asymmetric_keys/signature.c:154
 asymmetric_key_verify_signature+0x154/0x1ec crypto/asymmetric_keys/asymmetric_type.c:614
 keyctl_pkey_verify+0x1c4/0x248 security/keys/keyctl_pkey.c:326
 __do_sys_keyctl security/keys/keyctl.c:2017 [inline]
 __se_sys_keyctl security/keys/keyctl.c:1886 [inline]
 __arm64_sys_keyctl+0x62c/0x8e0 security/keys/keyctl.c:1886
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x290 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x13c/0x258 arch/arm64/kernel/syscall.c:140
 do_el0_svc+0x5c/0x134 arch/arm64/kernel/syscall.c:204
 el0_svc+0x58/0x128 arch/arm64/kernel/entry-common.c:637
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585
irq event stamp: 1764
hardirqs last  enabled at (1763): [<ffff800011c77b24>] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:151 [inline]
hardirqs last  enabled at (1763): [<ffff800011c77b24>] _raw_spin_unlock_irqrestore+0x48/0xac kernel/locking/spinlock.c:194
hardirqs last disabled at (1764): [<ffff800011b8c2bc>] el1_dbg+0x24/0x80 arch/arm64/kernel/entry-common.c:405
softirqs last  enabled at (1606): [<ffff800008031254>] local_bh_enable+0x10/0x34 include/linux/bottom_half.h:32
softirqs last disabled at (1604): [<ffff800008031220>] local_bh_disable+0x10/0x34 include/linux/bottom_half.h:19
---[ end trace 0000000000000000 ]---

Crashes (13):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
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
2026/08/19 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 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.