CVE-2026-23356 (GCVE-0-2026-23356)
Vulnerability from cvelistv5
Published
2026-03-25 10:27
Modified
2026-04-18 08:58
Severity ?
VLAI Severity ?
EPSS score ?
Summary
In the Linux kernel, the following vulnerability has been resolved:
drbd: fix "LOGIC BUG" in drbd_al_begin_io_nonblock()
Even though we check that we "should" be able to do lc_get_cumulative()
while holding the device->al_lock spinlock, it may still fail,
if some other code path decided to do lc_try_lock() with bad timing.
If that happened, we logged "LOGIC BUG for enr=...",
but still did not return an error.
The rest of the code now assumed that this request has references
for the relevant activity log extents.
The implcations are that during an active resync, mutual exclusivity of
resync versus application IO is not guaranteed. And a potential crash
at this point may not realizs that these extents could have been target
of in-flight IO and would need to be resynced just in case.
Also, once the request completes, it will give up activity log references it
does not even hold, which will trigger a BUG_ON(refcnt == 0) in lc_put().
Fix:
Do not crash the kernel for a condition that is harmless during normal
operation: also catch "e->refcnt == 0", not only "e == NULL"
when being noisy about "al_complete_io() called on inactive extent %u\n".
And do not try to be smart and "guess" whether something will work, then
be surprised when it does not.
Deal with the fact that it may or may not work. If it does not, remember a
possible "partially in activity log" state (only possible for requests that
cross extent boundaries), and return an error code from
drbd_al_begin_io_nonblock().
A latter call for the same request will then resume from where we left off.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Linux | Linux |
Version: 08a1ddab6df7d3c7b6341774cb1cf4b21b96a214 Version: 08a1ddab6df7d3c7b6341774cb1cf4b21b96a214 Version: 08a1ddab6df7d3c7b6341774cb1cf4b21b96a214 Version: 08a1ddab6df7d3c7b6341774cb1cf4b21b96a214 Version: 08a1ddab6df7d3c7b6341774cb1cf4b21b96a214 Version: 08a1ddab6df7d3c7b6341774cb1cf4b21b96a214 Version: 08a1ddab6df7d3c7b6341774cb1cf4b21b96a214 Version: 08a1ddab6df7d3c7b6341774cb1cf4b21b96a214 |
||
{
"containers": {
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"programFiles": [
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"drivers/block/drbd/drbd_interval.h"
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},
{
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"version": "5.15.203",
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{
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"version": "6.1.167",
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{
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},
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},
{
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},
{
"lessThanOrEqual": "*",
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}
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}
],
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"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrbd: fix \"LOGIC BUG\" in drbd_al_begin_io_nonblock()\n\nEven though we check that we \"should\" be able to do lc_get_cumulative()\nwhile holding the device-\u003eal_lock spinlock, it may still fail,\nif some other code path decided to do lc_try_lock() with bad timing.\n\nIf that happened, we logged \"LOGIC BUG for enr=...\",\nbut still did not return an error.\n\nThe rest of the code now assumed that this request has references\nfor the relevant activity log extents.\n\nThe implcations are that during an active resync, mutual exclusivity of\nresync versus application IO is not guaranteed. And a potential crash\nat this point may not realizs that these extents could have been target\nof in-flight IO and would need to be resynced just in case.\n\nAlso, once the request completes, it will give up activity log references it\ndoes not even hold, which will trigger a BUG_ON(refcnt == 0) in lc_put().\n\nFix:\n\nDo not crash the kernel for a condition that is harmless during normal\noperation: also catch \"e-\u003erefcnt == 0\", not only \"e == NULL\"\nwhen being noisy about \"al_complete_io() called on inactive extent %u\\n\".\n\nAnd do not try to be smart and \"guess\" whether something will work, then\nbe surprised when it does not.\nDeal with the fact that it may or may not work. If it does not, remember a\npossible \"partially in activity log\" state (only possible for requests that\ncross extent boundaries), and return an error code from\ndrbd_al_begin_io_nonblock().\n\nA latter call for the same request will then resume from where we left off."
}
],
"providerMetadata": {
"dateUpdated": "2026-04-18T08:58:08.080Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/933d161baa3794547adee621c0bf52cbf2c1b3cd"
},
{
"url": "https://git.kernel.org/stable/c/cf01aa6288e1190f89865e765056e2a9d8190639"
},
{
"url": "https://git.kernel.org/stable/c/7752569fc78e89794ce28946529850282233f99d"
},
{
"url": "https://git.kernel.org/stable/c/e91d8d6565b7819d13dab21d4dbed5b45efba59b"
},
{
"url": "https://git.kernel.org/stable/c/eef1390125b660b8b61f9f227a03bb9c5e6d36a5"
},
{
"url": "https://git.kernel.org/stable/c/d1ef3aed4df2ef1fe46befd8f2da9a6ec5445508"
},
{
"url": "https://git.kernel.org/stable/c/f558e5404a72054b525dced1a0c66aa95a144153"
},
{
"url": "https://git.kernel.org/stable/c/ab140365fb62c0bdab22b2f516aff563b2559e3b"
}
],
"title": "drbd: fix \"LOGIC BUG\" in drbd_al_begin_io_nonblock()",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-23356",
"datePublished": "2026-03-25T10:27:40.454Z",
"dateReserved": "2026-01-13T15:37:46.000Z",
"dateUpdated": "2026-04-18T08:58:08.080Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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