CVE-2026-23374 (GCVE-0-2026-23374)
Vulnerability from cvelistv5 – Published: 2026-03-25 10:27 – Updated: 2026-03-25 10:27
VLAI?
Title
blktrace: fix __this_cpu_read/write in preemptible context
Summary
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+0x10/0x40
[ 81.362872] CPU: 16 UID: 0 PID: 2516 Comm: dd Tainted: G N 7.0.0-rc1lblk+ #84 PREEMPT(full)
[ 81.362877] Tainted: [N]=TEST
[ 81.362878] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.17.0-0-gb52ca86e094d-prebuilt.qemu.org 04/01/2014
[ 81.362881] Call Trace:
[ 81.362884] <TASK>
[ 81.362886] dump_stack_lvl+0x8d/0xb0
...
(See '/mnt/sda/blktests/results/nodev/blktrace/002.dmesg' 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+0x10/0x40
[ 81.362872] CPU: 16 UID: 0 PID: 2516 Comm: dd Tainted: G N 7.0.0-rc1lblk+ #84 PREEMPT(full)
[ 81.362877] Tainted: [N]=TEST
[ 81.362878] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.17.0-0-gb52ca86e094d-prebuilt.qemu.org 04/01/2014
[ 81.362881] Call Trace:
[ 81.362884] <TASK>
[ 81.362886] dump_stack_lvl+0x8d/0xb0
[ 81.362895] check_preemption_disabled+0xce/0xe0
[ 81.362902] tracing_record_cmdline+0x10/0x40
[ 81.362923] __blk_add_trace+0x307/0x5d0
[ 81.362934] ? lock_acquire+0xe0/0x300
[ 81.362940] ? iov_iter_extract_pages+0x101/0xa30
[ 81.362959] blk_add_trace_bio+0x106/0x1e0
[ 81.362968] submit_bio_noacct_nocheck+0x24b/0x3a0
[ 81.362979] ? lockdep_init_map_type+0x58/0x260
[ 81.362988] submit_bio_wait+0x56/0x90
[ 81.363009] __blkdev_direct_IO_simple+0x16c/0x250
[ 81.363026] ? __pfx_submit_bio_wait_endio+0x10/0x10
[ 81.363038] ? rcu_read_lock_any_held+0x73/0xa0
[ 81.363051] blkdev_read_iter+0xc1/0x140
[ 81.363059] vfs_read+0x20b/0x330
[ 81.363083] ksys_read+0x67/0xe0
[ 81.363090] do_syscall_64+0xbf/0xf00
[ 81.363102] entry_SYSCALL_64_after_hwframe+0x76/0x7e
[ 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 <48> 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] </TASK>
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---
Severity ?
No CVSS data available.
Assigner
References
Impacted products
{
"containers": {
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"kernel/trace/blktrace.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "59efa088752b1c380a0475974679850cc8aef907",
"status": "affected",
"version": "7ffbd48d5cab22bcd1120eb2349db1319e2d827a",
"versionType": "git"
},
{
"lessThan": "da46b5dfef48658d03347cda21532bcdbb521e67",
"status": "affected",
"version": "7ffbd48d5cab22bcd1120eb2349db1319e2d827a",
"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"kernel/trace/blktrace.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "3.8"
},
{
"lessThan": "3.8",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.19.*",
"status": "unaffected",
"version": "6.19.7",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.0-rc3",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.19.7",
"versionStartIncluding": "3.8",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.0-rc3",
"versionStartIncluding": "3.8",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "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] \u003cTASK\u003e\n [ 81.362886] dump_stack_lvl+0x8d/0xb0\n ...\n (See \u0027/mnt/sda/blktests/results/nodev/blktrace/002.dmesg\u0027 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] \u003cTASK\u003e\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 \u003c48\u003e 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] \u003c/TASK\u003e\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---"
}
],
"providerMetadata": {
"dateUpdated": "2026-03-25T10:27:55.117Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/59efa088752b1c380a0475974679850cc8aef907"
},
{
"url": "https://git.kernel.org/stable/c/da46b5dfef48658d03347cda21532bcdbb521e67"
}
],
"title": "blktrace: fix __this_cpu_read/write in preemptible context",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-23374",
"datePublished": "2026-03-25T10:27:55.117Z",
"dateReserved": "2026-01-13T15:37:46.003Z",
"dateUpdated": "2026-03-25T10:27:55.117Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"nvd": "{\"cve\":{\"id\":\"CVE-2026-23374\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-03-25T11:16:37.077\",\"lastModified\":\"2026-03-25T15:41:33.977\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"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] \u003cTASK\u003e\\n [ 81.362886] dump_stack_lvl+0x8d/0xb0\\n ...\\n (See \u0027/mnt/sda/blktests/results/nodev/blktrace/002.dmesg\u0027 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] \u003cTASK\u003e\\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 \u003c48\u003e 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] \u003c/TASK\u003e\\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---\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/59efa088752b1c380a0475974679850cc8aef907\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/da46b5dfef48658d03347cda21532bcdbb521e67\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
}
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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