CVE-2026-23275 (GCVE-0-2026-23275)
Vulnerability from cvelistv5
Published
2026-03-20 08:08
Modified
2026-04-13 06:03
Severity ?
VLAI Severity ?
EPSS score ?
Summary
In the Linux kernel, the following vulnerability has been resolved:
io_uring: ensure ctx->rings is stable for task work flags manipulation
If DEFER_TASKRUN | SETUP_TASKRUN is used and task work is added while
the ring is being resized, it's possible for the OR'ing of
IORING_SQ_TASKRUN to happen in the small window of swapping into the
new rings and the old rings being freed.
Prevent this by adding a 2nd ->rings pointer, ->rings_rcu, which is
protected by RCU. The task work flags manipulation is inside RCU
already, and if the resize ring freeing is done post an RCU synchronize,
then there's no need to add locking to the fast path of task work
additions.
Note: this is only done for DEFER_TASKRUN, as that's the only setup mode
that supports ring resizing. If this ever changes, then they too need to
use the io_ctx_mark_taskrun() helper.
References
Impacted products
{
"containers": {
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"include/linux/io_uring_types.h",
"io_uring/io_uring.c",
"io_uring/register.c",
"io_uring/tw.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "7cc4530b3e952d4a5947e1e55d06620d8845d4f5",
"status": "affected",
"version": "79cfe9e59c2a12c3b3faeeefe38d23f3d8030972",
"versionType": "git"
},
{
"lessThan": "46dc07d5f31411cc023f3bf1f4a23a07bf6e0ed1",
"status": "affected",
"version": "79cfe9e59c2a12c3b3faeeefe38d23f3d8030972",
"versionType": "git"
},
{
"lessThan": "96189080265e6bb5dde3a4afbaf947af493e3f82",
"status": "affected",
"version": "79cfe9e59c2a12c3b3faeeefe38d23f3d8030972",
"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"include/linux/io_uring_types.h",
"io_uring/io_uring.c",
"io_uring/register.c",
"io_uring/tw.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "6.13"
},
{
"lessThan": "6.13",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.19",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.19.*",
"status": "unaffected",
"version": "6.19.9",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.0",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.18.19",
"versionStartIncluding": "6.13",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.19.9",
"versionStartIncluding": "6.13",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.0",
"versionStartIncluding": "6.13",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nio_uring: ensure ctx-\u003erings is stable for task work flags manipulation\n\nIf DEFER_TASKRUN | SETUP_TASKRUN is used and task work is added while\nthe ring is being resized, it\u0027s possible for the OR\u0027ing of\nIORING_SQ_TASKRUN to happen in the small window of swapping into the\nnew rings and the old rings being freed.\n\nPrevent this by adding a 2nd -\u003erings pointer, -\u003erings_rcu, which is\nprotected by RCU. The task work flags manipulation is inside RCU\nalready, and if the resize ring freeing is done post an RCU synchronize,\nthen there\u0027s no need to add locking to the fast path of task work\nadditions.\n\nNote: this is only done for DEFER_TASKRUN, as that\u0027s the only setup mode\nthat supports ring resizing. If this ever changes, then they too need to\nuse the io_ctx_mark_taskrun() helper."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 7.8,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-04-13T06:03:24.886Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/7cc4530b3e952d4a5947e1e55d06620d8845d4f5"
},
{
"url": "https://git.kernel.org/stable/c/46dc07d5f31411cc023f3bf1f4a23a07bf6e0ed1"
},
{
"url": "https://git.kernel.org/stable/c/96189080265e6bb5dde3a4afbaf947af493e3f82"
}
],
"title": "io_uring: ensure ctx-\u003erings is stable for task work flags manipulation",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-23275",
"datePublished": "2026-03-20T08:08:55.857Z",
"dateReserved": "2026-01-13T15:37:45.991Z",
"dateUpdated": "2026-04-13T06:03:24.886Z",
"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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