CVE-2026-43314 (GCVE-0-2026-43314)
Vulnerability from cvelistv5 – Published: 2026-05-08 13:11 – Updated: 2026-05-08 13:11
VLAI?
Title
dm: remove fake timeout to avoid leak request
Summary
In the Linux kernel, the following vulnerability has been resolved:
dm: remove fake timeout to avoid leak request
Since commit 15f73f5b3e59 ("blk-mq: move failure injection out of
blk_mq_complete_request"), drivers are responsible for calling
blk_should_fake_timeout() at appropriate code paths and opportunities.
However, the dm driver does not implement its own timeout handler and
relies on the timeout handling of its slave devices.
If an io-timeout-fail error is injected to a dm device, the request
will be leaked and never completed, causing tasks to hang indefinitely.
Reproduce:
1. prepare dm which has iscsi slave device
2. inject io-timeout-fail to dm
echo 1 >/sys/class/block/dm-0/io-timeout-fail
echo 100 >/sys/kernel/debug/fail_io_timeout/probability
echo 10 >/sys/kernel/debug/fail_io_timeout/times
3. read/write dm
4. iscsiadm -m node -u
Result: hang task like below
[ 862.243768] INFO: task kworker/u514:2:151 blocked for more than 122 seconds.
[ 862.244133] Tainted: G E 6.19.0-rc1+ #51
[ 862.244337] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 862.244718] task:kworker/u514:2 state:D stack:0 pid:151 tgid:151 ppid:2 task_flags:0x4288060 flags:0x00080000
[ 862.245024] Workqueue: iscsi_ctrl_3:1 __iscsi_unbind_session [scsi_transport_iscsi]
[ 862.245264] Call Trace:
[ 862.245587] <TASK>
[ 862.245814] __schedule+0x810/0x15c0
[ 862.246557] schedule+0x69/0x180
[ 862.246760] blk_mq_freeze_queue_wait+0xde/0x120
[ 862.247688] elevator_change+0x16d/0x460
[ 862.247893] elevator_set_none+0x87/0xf0
[ 862.248798] blk_unregister_queue+0x12e/0x2a0
[ 862.248995] __del_gendisk+0x231/0x7e0
[ 862.250143] del_gendisk+0x12f/0x1d0
[ 862.250339] sd_remove+0x85/0x130 [sd_mod]
[ 862.250650] device_release_driver_internal+0x36d/0x530
[ 862.250849] bus_remove_device+0x1dd/0x3f0
[ 862.251042] device_del+0x38a/0x930
[ 862.252095] __scsi_remove_device+0x293/0x360
[ 862.252291] scsi_remove_target+0x486/0x760
[ 862.252654] __iscsi_unbind_session+0x18a/0x3e0 [scsi_transport_iscsi]
[ 862.252886] process_one_work+0x633/0xe50
[ 862.253101] worker_thread+0x6df/0xf10
[ 862.253647] kthread+0x36d/0x720
[ 862.254533] ret_from_fork+0x2a6/0x470
[ 862.255852] ret_from_fork_asm+0x1a/0x30
[ 862.256037] </TASK>
Remove the blk_should_fake_timeout() check from dm, as dm has no
native timeout handling and should not attempt to fake timeouts.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
| Vendor | Product | Version | |||||||
|---|---|---|---|---|---|---|---|---|---|
| Linux | Linux |
Affected:
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < ece6720de9403260088209b0b92d45e0b49ff856
(git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 8200fca818c1e2f65bc6cb16d934ff6049302197 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < b307b6307f6459841312432bd4bc9519cbac97f5 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 4f9e7ca933a9fbf9912a384b061a00c77332cbf0 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < cf2d06c9fd4b6521ea5b7f73c99c64c2c6f5e224 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 6cdb21e0c9fdee484feba14fc9e72e9d07daf9f3 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < c8a23d4c995ef4227bd4de64cd3910637ee6162e (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < f3a9c95a15d2f4466acad5c68faeff79ca5e9f47 (git) |
|||||||
|
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{
"containers": {
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{
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"product": "Linux",
"programFiles": [
"drivers/md/dm-rq.c"
],
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"vendor": "Linux",
"versions": [
{
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"version": "5.10.252",
"versionType": "semver"
},
{
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"status": "unaffected",
"version": "5.15.202",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.165",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.128",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.75",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.16",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.19.*",
"status": "unaffected",
"version": "6.19.6",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.0",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
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"versionEndExcluding": "5.10.252",
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}
],
"negate": false,
"operator": "OR"
}
]
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],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndm: remove fake timeout to avoid leak request\n\nSince commit 15f73f5b3e59 (\"blk-mq: move failure injection out of\nblk_mq_complete_request\"), drivers are responsible for calling\nblk_should_fake_timeout() at appropriate code paths and opportunities.\n\nHowever, the dm driver does not implement its own timeout handler and\nrelies on the timeout handling of its slave devices.\n\nIf an io-timeout-fail error is injected to a dm device, the request\nwill be leaked and never completed, causing tasks to hang indefinitely.\n\nReproduce:\n1. prepare dm which has iscsi slave device\n2. inject io-timeout-fail to dm\n echo 1 \u003e/sys/class/block/dm-0/io-timeout-fail\n echo 100 \u003e/sys/kernel/debug/fail_io_timeout/probability\n echo 10 \u003e/sys/kernel/debug/fail_io_timeout/times\n3. read/write dm\n4. iscsiadm -m node -u\n\nResult: hang task like below\n[ 862.243768] INFO: task kworker/u514:2:151 blocked for more than 122 seconds.\n[ 862.244133] Tainted: G E 6.19.0-rc1+ #51\n[ 862.244337] \"echo 0 \u003e /proc/sys/kernel/hung_task_timeout_secs\" disables this message.\n[ 862.244718] task:kworker/u514:2 state:D stack:0 pid:151 tgid:151 ppid:2 task_flags:0x4288060 flags:0x00080000\n[ 862.245024] Workqueue: iscsi_ctrl_3:1 __iscsi_unbind_session [scsi_transport_iscsi]\n[ 862.245264] Call Trace:\n[ 862.245587] \u003cTASK\u003e\n[ 862.245814] __schedule+0x810/0x15c0\n[ 862.246557] schedule+0x69/0x180\n[ 862.246760] blk_mq_freeze_queue_wait+0xde/0x120\n[ 862.247688] elevator_change+0x16d/0x460\n[ 862.247893] elevator_set_none+0x87/0xf0\n[ 862.248798] blk_unregister_queue+0x12e/0x2a0\n[ 862.248995] __del_gendisk+0x231/0x7e0\n[ 862.250143] del_gendisk+0x12f/0x1d0\n[ 862.250339] sd_remove+0x85/0x130 [sd_mod]\n[ 862.250650] device_release_driver_internal+0x36d/0x530\n[ 862.250849] bus_remove_device+0x1dd/0x3f0\n[ 862.251042] device_del+0x38a/0x930\n[ 862.252095] __scsi_remove_device+0x293/0x360\n[ 862.252291] scsi_remove_target+0x486/0x760\n[ 862.252654] __iscsi_unbind_session+0x18a/0x3e0 [scsi_transport_iscsi]\n[ 862.252886] process_one_work+0x633/0xe50\n[ 862.253101] worker_thread+0x6df/0xf10\n[ 862.253647] kthread+0x36d/0x720\n[ 862.254533] ret_from_fork+0x2a6/0x470\n[ 862.255852] ret_from_fork_asm+0x1a/0x30\n[ 862.256037] \u003c/TASK\u003e\n\nRemove the blk_should_fake_timeout() check from dm, as dm has no\nnative timeout handling and should not attempt to fake timeouts."
}
],
"providerMetadata": {
"dateUpdated": "2026-05-08T13:11:31.068Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/ece6720de9403260088209b0b92d45e0b49ff856"
},
{
"url": "https://git.kernel.org/stable/c/8200fca818c1e2f65bc6cb16d934ff6049302197"
},
{
"url": "https://git.kernel.org/stable/c/b307b6307f6459841312432bd4bc9519cbac97f5"
},
{
"url": "https://git.kernel.org/stable/c/4f9e7ca933a9fbf9912a384b061a00c77332cbf0"
},
{
"url": "https://git.kernel.org/stable/c/cf2d06c9fd4b6521ea5b7f73c99c64c2c6f5e224"
},
{
"url": "https://git.kernel.org/stable/c/6cdb21e0c9fdee484feba14fc9e72e9d07daf9f3"
},
{
"url": "https://git.kernel.org/stable/c/c8a23d4c995ef4227bd4de64cd3910637ee6162e"
},
{
"url": "https://git.kernel.org/stable/c/f3a9c95a15d2f4466acad5c68faeff79ca5e9f47"
}
],
"title": "dm: remove fake timeout to avoid leak request",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-43314",
"datePublished": "2026-05-08T13:11:31.068Z",
"dateReserved": "2026-05-01T14:12:56.001Z",
"dateUpdated": "2026-05-08T13:11:31.068Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"nvd": "{\"cve\":{\"id\":\"CVE-2026-43314\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-05-08T14:16:39.830\",\"lastModified\":\"2026-05-08T14:16:39.830\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\ndm: remove fake timeout to avoid leak request\\n\\nSince commit 15f73f5b3e59 (\\\"blk-mq: move failure injection out of\\nblk_mq_complete_request\\\"), drivers are responsible for calling\\nblk_should_fake_timeout() at appropriate code paths and opportunities.\\n\\nHowever, the dm driver does not implement its own timeout handler and\\nrelies on the timeout handling of its slave devices.\\n\\nIf an io-timeout-fail error is injected to a dm device, the request\\nwill be leaked and never completed, causing tasks to hang indefinitely.\\n\\nReproduce:\\n1. prepare dm which has iscsi slave device\\n2. inject io-timeout-fail to dm\\n echo 1 \u003e/sys/class/block/dm-0/io-timeout-fail\\n echo 100 \u003e/sys/kernel/debug/fail_io_timeout/probability\\n echo 10 \u003e/sys/kernel/debug/fail_io_timeout/times\\n3. read/write dm\\n4. iscsiadm -m node -u\\n\\nResult: hang task like below\\n[ 862.243768] INFO: task kworker/u514:2:151 blocked for more than 122 seconds.\\n[ 862.244133] Tainted: G E 6.19.0-rc1+ #51\\n[ 862.244337] \\\"echo 0 \u003e /proc/sys/kernel/hung_task_timeout_secs\\\" disables this message.\\n[ 862.244718] task:kworker/u514:2 state:D stack:0 pid:151 tgid:151 ppid:2 task_flags:0x4288060 flags:0x00080000\\n[ 862.245024] Workqueue: iscsi_ctrl_3:1 __iscsi_unbind_session [scsi_transport_iscsi]\\n[ 862.245264] Call Trace:\\n[ 862.245587] \u003cTASK\u003e\\n[ 862.245814] __schedule+0x810/0x15c0\\n[ 862.246557] schedule+0x69/0x180\\n[ 862.246760] blk_mq_freeze_queue_wait+0xde/0x120\\n[ 862.247688] elevator_change+0x16d/0x460\\n[ 862.247893] elevator_set_none+0x87/0xf0\\n[ 862.248798] blk_unregister_queue+0x12e/0x2a0\\n[ 862.248995] __del_gendisk+0x231/0x7e0\\n[ 862.250143] del_gendisk+0x12f/0x1d0\\n[ 862.250339] sd_remove+0x85/0x130 [sd_mod]\\n[ 862.250650] device_release_driver_internal+0x36d/0x530\\n[ 862.250849] bus_remove_device+0x1dd/0x3f0\\n[ 862.251042] device_del+0x38a/0x930\\n[ 862.252095] __scsi_remove_device+0x293/0x360\\n[ 862.252291] scsi_remove_target+0x486/0x760\\n[ 862.252654] __iscsi_unbind_session+0x18a/0x3e0 [scsi_transport_iscsi]\\n[ 862.252886] process_one_work+0x633/0xe50\\n[ 862.253101] worker_thread+0x6df/0xf10\\n[ 862.253647] kthread+0x36d/0x720\\n[ 862.254533] ret_from_fork+0x2a6/0x470\\n[ 862.255852] ret_from_fork_asm+0x1a/0x30\\n[ 862.256037] \u003c/TASK\u003e\\n\\nRemove the blk_should_fake_timeout() check from dm, as dm has no\\nnative timeout handling and should not attempt to fake timeouts.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/4f9e7ca933a9fbf9912a384b061a00c77332cbf0\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/6cdb21e0c9fdee484feba14fc9e72e9d07daf9f3\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/8200fca818c1e2f65bc6cb16d934ff6049302197\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b307b6307f6459841312432bd4bc9519cbac97f5\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c8a23d4c995ef4227bd4de64cd3910637ee6162e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/cf2d06c9fd4b6521ea5b7f73c99c64c2c6f5e224\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ece6720de9403260088209b0b92d45e0b49ff856\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f3a9c95a15d2f4466acad5c68faeff79ca5e9f47\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
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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