CVE-2026-23244

In the Linux kernel, the following vulnerability has been resolved:

nvme: fix memory allocation in nvme_pr_read_keys()

nvme_pr_read_keys() takes num_keys from userspace and uses it to

calculate the allocation size for rse via struct_size(). The upper

limit is PR_KEYS_MAX (64K).

A malicious or buggy userspace can pass a large num_keys value that

results in a 4MB allocation attempt at most, causing a warning in

the page allocator when the order exceeds MAX_PAGE_ORDER.

To fix this, use kvzalloc() instead of kzalloc().

This bug has the same reasoning and fix with the patch below:

https://lore.kernel.org/linux-block/[email protected]/

Warning log:

WARNING: mm/page_alloc.c:5216 at __alloc_frozen_pages_noprof+0x5aa/0x2300 mm/page_alloc.c:5216, CPU#1: syz-executor117/272

Modules linked in:

CPU: 1 UID: 0 PID: 272 Comm: syz-executor117 Not tainted 6.19.0 #1 PREEMPT(voluntary)

Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014

RIP: 0010:__alloc_frozen_pages_noprof+0x5aa/0x2300 mm/page_alloc.c:5216

Code: ff 83 bd a8 fe ff ff 0a 0f 86 69 fb ff ff 0f b6 1d f9 f9 c4 04 80 fb 01 0f 87 3b 76 30 ff 83 e3 01 75 09 c6 05 e4 f9 c4 04 01 <0f> 0b 48 c7 85 70 fe ff ff 00 00 00 00 e9 8f fd ff ff 31 c0 e9 0d

RSP: 0018:ffffc90000fcf450 EFLAGS: 00010246

RAX: 0000000000000000 RBX: 0000000000000000 RCX: 1ffff920001f9ea0

RDX: 0000000000000000 RSI: 000000000000000b RDI: 0000000000040dc0

RBP: ffffc90000fcf648 R08: ffff88800b6c3380 R09: 0000000000000001

R10: ffffc90000fcf840 R11: ffff88807ffad280 R12: 0000000000000000

R13: 0000000000040dc0 R14: 0000000000000001 R15: ffffc90000fcf620

FS: 0000555565db33c0(0000) GS:ffff8880be26c000(0000) knlGS:0000000000000000

CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033

CR2: 000000002000000c CR3: 0000000003b72000 CR4: 00000000000006f0

Call Trace:

<TASK>

alloc_pages_mpol+0x236/0x4d0 mm/mempolicy.c:2486

alloc_frozen_pages_noprof+0x149/0x180 mm/mempolicy.c:2557

___kmalloc_large_node+0x10c/0x140 mm/slub.c:5598

__kmalloc_large_node_noprof+0x25/0xc0 mm/slub.c:5629

__do_kmalloc_node mm/slub.c:5645 [inline]

__kmalloc_noprof+0x483/0x6f0 mm/slub.c:5669

kmalloc_noprof include/linux/slab.h:961 [inline]

kzalloc_noprof include/linux/slab.h:1094 [inline]

nvme_pr_read_keys+0x8f/0x4c0 drivers/nvme/host/pr.c:245

blkdev_pr_read_keys block/ioctl.c:456 [inline]

blkdev_common_ioctl+0x1b71/0x29b0 block/ioctl.c:730

blkdev_ioctl+0x299/0x700 block/ioctl.c:786

vfs_ioctl fs/ioctl.c:51 [inline]

__do_sys_ioctl fs/ioctl.c:597 [inline]

__se_sys_ioctl fs/ioctl.c:583 [inline]

__x64_sys_ioctl+0x1bf/0x220 fs/ioctl.c:583

x64_sys_call+0x1280/0x21b0 mnt/fuzznvme_1/fuzznvme/linux-build/v6.19/./arch/x86/include/generated/asm/syscalls_64.h:17

do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]

do_syscall_64+0x71/0x330 arch/x86/entry/syscall_64.c:94

entry_SYSCALL_64_after_hwframe+0x76/0x7e

RIP: 0033:0x7fb893d3108d

Code: 28 c3 e8 46 1e 00 00 66 0f 1f 44 00 00 f3 0f 1e fa 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 b8 ff ff ff f7 d8 64 89 01 48

RSP: 002b:00007ffff61f2f38 EFLAGS: 00000246 ORIG_RAX: 0000000000000010

RAX: ffffffffffffffda RBX: 00007ffff61f3138 RCX: 00007fb893d3108d

RDX: 0000000020000040 RSI: 00000000c01070ce RDI: 0000000000000003

RBP: 0000000000000001 R08: 0000000000000000 R09: 00007ffff61f3138

R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001

R13: 00007ffff61f3128 R14: 00007fb893dae530 R15: 0000000000000001

</TASK>