{
  "cveId": "CVE-2026-23374",
  "url": "https://patchblox.com/security/cve/CVE-2026-23374",
  "summary": "CVE-2026-23374 is fixed in 64 products on 1 platform, first by DEBIAN-CVE-2026-23374, released March 25, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "blktrace: fix __this_cpu_read/write in preemptible context",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  blktrace: fix __this_cpu_read/write in preemptible context  tracing_record_cmdline() internally uses __this_cpu_read() and __this_cpu_write() on the per-CPU variable trace_cmdline_save, and trace_save_cmdline() explicitly asserts preemption is disabled via lockdep_assert_preemption_disabled(). These operations are only safe when preemption is off, as they were designed to be called from the scheduler context (probe_wakeup_sched_switch() / probe_wakeup()).  __blk_add_trace() was calling tracing_record_cmdline(current) early in the blk_tracer path, before ring buffer reservation, from process context where preemption is fully enabled. This triggers the following using blktests/blktrace/002:  blktrace/002 (blktrace ftrace corruption with sysfs trace)   [failed]     runtime  0.367s  ...  0.437s     something found in dmesg:     [   81.211018] run blktests blktrace/002 at 2026-02-25 22:24:33     [   81.239580] null_blk: disk nullb1 created     [   81.357294] BUG: using __this_cpu_read() in preemptible [00000000] code: dd/2516     [   81.362842] caller is tracing_record_cmdline\u002B0x10/0x40     [   81.362872] CPU: 16 UID: 0 PID: 2516 Comm: dd Tainted: G                 N  7.0.0-rc1lblk\u002B #84 PREEMPT(full)     [   81.362877] Tainted: [N]=TEST     [   81.362878] Hardware name: QEMU Standard PC (i440FX \u002B PIIX, 1996), BIOS rel-1.17.0-0-gb52ca86e094d-prebuilt.qemu.org 04/01/2014     [   81.362881] Call Trace:     [   81.362884]  \u003CTASK\u003E     [   81.362886]  dump_stack_lvl\u002B0x8d/0xb0     ...     (See \u0027/mnt/sda/blktests/results/nodev/blktrace/002.dmesg\u0027 for the entire message)  [   81.211018] run blktests blktrace/002 at 2026-02-25 22:24:33 [   81.239580] null_blk: disk nullb1 created [   81.357294] BUG: using __this_cpu_read() in preemptible [00000000] code: dd/2516 [   81.362842] caller is tracing_record_cmdline\u002B0x10/0x40 [   81.362872] CPU: 16 UID: 0 PID: 2516 Comm: dd Tainted: G                 N  7.0.0-rc1lblk\u002B #84 PREEMPT(full) [   81.362877] Tainted: [N]=TEST [   81.362878] Hardware name: QEMU Standard PC (i440FX \u002B PIIX, 1996), BIOS rel-1.17.0-0-gb52ca86e094d-prebuilt.qemu.org 04/01/2014 [   81.362881] Call Trace: [   81.362884]  \u003CTASK\u003E [   81.362886]  dump_stack_lvl\u002B0x8d/0xb0 [   81.362895]  check_preemption_disabled\u002B0xce/0xe0 [   81.362902]  tracing_record_cmdline\u002B0x10/0x40 [   81.362923]  __blk_add_trace\u002B0x307/0x5d0 [   81.362934]  ? lock_acquire\u002B0xe0/0x300 [   81.362940]  ? iov_iter_extract_pages\u002B0x101/0xa30 [   81.362959]  blk_add_trace_bio\u002B0x106/0x1e0 [   81.362968]  submit_bio_noacct_nocheck\u002B0x24b/0x3a0 [   81.362979]  ? lockdep_init_map_type\u002B0x58/0x260 [   81.362988]  submit_bio_wait\u002B0x56/0x90 [   81.363009]  __blkdev_direct_IO_simple\u002B0x16c/0x250 [   81.363026]  ? __pfx_submit_bio_wait_endio\u002B0x10/0x10 [   81.363038]  ? rcu_read_lock_any_held\u002B0x73/0xa0 [   81.363051]  blkdev_read_iter\u002B0xc1/0x140 [   81.363059]  vfs_read\u002B0x20b/0x330 [   81.363083]  ksys_read\u002B0x67/0xe0 [   81.363090]  do_syscall_64\u002B0xbf/0xf00 [   81.363102]  entry_SYSCALL_64_after_hwframe\u002B0x76/0x7e [   81.363106] RIP: 0033:0x7f281906029d [   81.363111] Code: 31 c0 e9 c6 fe ff ff 50 48 8d 3d 66 63 0a 00 e8 59 ff 01 00 66 0f 1f 84 00 00 00 00 00 80 3d 41 33 0e 00 00 74 17 31 c0 0f 05 \u003C48\u003E 3d 00 f0 ff ff 77 5b c3 66 2e 0f 1f 84 00 00 00 00 00 48 83 ec [   81.363113] RSP: 002b:00007ffca127dd48 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 [   81.363120] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f281906029d [   81.363122] RDX: 0000000000001000 RSI: 0000559f8bfae000 RDI: 0000000000000000 [   81.363123] RBP: 0000000000001000 R08: 0000002863a10a81 R09: 00007f281915f000 [   81.363124] R10: 00007f2818f77b60 R11: 0000000000000246 R12: 0000559f8bfae000 [   81.363126] R13: 0000000000000000 R14: 0000000000000000 R15: 000000000000000a [   81.363142]  \u003C/TASK\u003E  The same BUG fires from blk_add_trace_plug(), blk_add_trace_unplug(), and blk_add_trace_rq() paths as well.  The purpose of tracin ---truncated---",
  "published": "2026-03-25T11:16:37Z",
  "severity": "Important",
  "cvss": 8.4,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
  "epss": 0.00124,
  "epssPercentile": 0.02141,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-23374",
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