{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-23374",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2026-23374"
  ],
  "published": "2026-03-25T10:28:03Z",
  "summary": "blktrace: fix __this_cpu_read/write in preemptible context",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nblktrace: fix __this_cpu_read/write in preemptible context\n\ntracing_record_cmdline() internally uses __this_cpu_read() and\n__this_cpu_write() on the per-CPU variable trace_cmdline_save, and\ntrace_save_cmdline() explicitly asserts preemption is disabled via\nlockdep_assert_preemption_disabled(). These operations are only safe\nwhen preemption is off, as they were designed to be called from the\nscheduler context (probe_wakeup_sched_switch() / probe_wakeup()).\n\n__blk_add_trace() was calling tracing_record_cmdline(current) early in\nthe blk_tracer path, before ring buffer reservation, from process\ncontext where preemption is fully enabled. This triggers the following\nusing blktests/blktrace/002:\n\nblktrace/002 (blktrace ftrace corruption with sysfs trace)   [failed]\n    runtime  0.367s  ...  0.437s\n    something found in dmesg:\n    [   81.211018] run blktests blktrace/002 at 2026-02-25 22:24:33\n    [   81.239580] null_blk: disk nullb1 created\n    [   81.357294] BUG: using __this_cpu_read() in preemptible [00000000] code: dd/2516\n    [   81.362842] caller is tracing_record_cmdline+0x10/0x40\n    [   81.362872] CPU: 16 UID: 0 PID: 2516 Comm: dd Tainted: G                 N  7.0.0-rc1lblk+ #84 PREEMPT(full)\n    [   81.362877] Tainted: [N]=TEST\n    [   81.362878] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.17.0-0-gb52ca86e094d-prebuilt.qemu.org 04/01/2014\n    [   81.362881] Call Trace:\n    [   81.362884]  <TASK>\n    [   81.362886]  dump_stack_lvl+0x8d/0xb0\n    ...\n    (See '/mnt/sda/blktests/results/nodev/blktrace/002.dmesg' for the entire message)\n\n[   81.211018] run blktests blktrace/002 at 2026-02-25 22:24:33\n[   81.239580] null_blk: disk nullb1 created\n[   81.357294] BUG: using __this_cpu_read() in preemptible [00000000] code: dd/2516\n[   81.362842] caller is tracing_record_cmdline+0x10/0x40\n[   81.362872] CPU: 16 UID: 0 PID: 2516 Comm: dd Tainted: G                 N  7.0.0-rc1lblk+ #84 PREEMPT(full)\n[   81.362877] Tainted: [N]=TEST\n[   81.362878] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.17.0-0-gb52ca86e094d-prebuilt.qemu.org 04/01/2014\n[   81.362881] Call Trace:\n[   81.362884]  <TASK>\n[   81.362886]  dump_stack_lvl+0x8d/0xb0\n[   81.362895]  check_preemption_disabled+0xce/0xe0\n[   81.362902]  tracing_record_cmdline+0x10/0x40\n[   81.362923]  __blk_add_trace+0x307/0x5d0\n[   81.362934]  ? lock_acquire+0xe0/0x300\n[   81.362940]  ? iov_iter_extract_pages+0x101/0xa30\n[   81.362959]  blk_add_trace_bio+0x106/0x1e0\n[   81.362968]  submit_bio_noacct_nocheck+0x24b/0x3a0\n[   81.362979]  ? lockdep_init_map_type+0x58/0x260\n[   81.362988]  submit_bio_wait+0x56/0x90\n[   81.363009]  __blkdev_direct_IO_simple+0x16c/0x250\n[   81.363026]  ? __pfx_submit_bio_wait_endio+0x10/0x10\n[   81.363038]  ? rcu_read_lock_any_held+0x73/0xa0\n[   81.363051]  blkdev_read_iter+0xc1/0x140\n[   81.363059]  vfs_read+0x20b/0x330\n[   81.363083]  ksys_read+0x67/0xe0\n[   81.363090]  do_syscall_64+0xbf/0xf00\n[   81.363102]  entry_SYSCALL_64_after_hwframe+0x76/0x7e\n[   81.363106] RIP: 0033:0x7f281906029d\n[   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 <48> 3d 00 f0 ff ff 77 5b c3 66 2e 0f 1f 84 00 00 00 00 00 48 83 ec\n[   81.363113] RSP: 002b:00007ffca127dd48 EFLAGS: 00000246 ORIG_RAX: 0000000000000000\n[   81.363120] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f281906029d\n[   81.363122] RDX: 0000000000001000 RSI: 0000559f8bfae000 RDI: 0000000000000000\n[   81.363123] RBP: 0000000000001000 R08: 0000002863a10a81 R09: 00007f281915f000\n[   81.363124] R10: 00007f2818f77b60 R11: 0000000000000246 R12: 0000559f8bfae000\n[   81.363126] R13: 0000000000000000 R14: 0000000000000000 R15: 000000000000000a\n[   81.363142]  </TASK>\n\nThe same BUG fires from blk_add_trace_plug(), blk_add_trace_unplug(),\nand blk_add_trace_rq() paths as well.\n\nThe purpose of tracin\n---truncated---",
  "affected": [
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      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-23374"
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    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-05-12T04:54:46Z"
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}