{
  "cveId": "CVE-2026-23244",
  "url": "https://patchblox.com/security/cve/CVE-2026-23244",
  "summary": "CVE-2026-23244 is fixed in 80 products on 1 platform, first by DEBIAN-CVE-2026-23244, released March 18, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "nvme: fix memory allocation in nvme_pr_read_keys()",
  "description": "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/20251212013510.3576091-1-kartikey406@gmail.com/  Warning log: WARNING: mm/page_alloc.c:5216 at __alloc_frozen_pages_noprof\u002B0x5aa/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 \u002B PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014 RIP: 0010:__alloc_frozen_pages_noprof\u002B0x5aa/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 \u003C0f\u003E 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:  \u003CTASK\u003E  alloc_pages_mpol\u002B0x236/0x4d0 mm/mempolicy.c:2486  alloc_frozen_pages_noprof\u002B0x149/0x180 mm/mempolicy.c:2557  ___kmalloc_large_node\u002B0x10c/0x140 mm/slub.c:5598  __kmalloc_large_node_noprof\u002B0x25/0xc0 mm/slub.c:5629  __do_kmalloc_node mm/slub.c:5645 [inline]  __kmalloc_noprof\u002B0x483/0x6f0 mm/slub.c:5669  kmalloc_noprof include/linux/slab.h:961 [inline]  kzalloc_noprof include/linux/slab.h:1094 [inline]  nvme_pr_read_keys\u002B0x8f/0x4c0 drivers/nvme/host/pr.c:245  blkdev_pr_read_keys block/ioctl.c:456 [inline]  blkdev_common_ioctl\u002B0x1b71/0x29b0 block/ioctl.c:730  blkdev_ioctl\u002B0x299/0x700 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\u002B0x1bf/0x220 fs/ioctl.c:583  x64_sys_call\u002B0x1280/0x21b0 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\u002B0x71/0x330 arch/x86/entry/syscall_64.c:94  entry_SYSCALL_64_after_hwframe\u002B0x76/0x7e 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 \u003C48\u003E 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  \u003C/TASK\u003E",
  "published": "2026-03-18T11:16:16Z",
  "severity": "Moderate",
  "cvss": 7.1,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
  "epss": 0.00128,
  "epssPercentile": 0.02509,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-23244",
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