CVE-2026-68153 (GCVE-0-2026-68153)
Vulnerability from cvelistv5
Published
2026-08-10 11:59
Modified
2026-08-19 16:30
Severity ?
VLAI Severity ?
EPSS score ?
Summary
In the Linux kernel, the following vulnerability has been resolved:
libceph: remove debugfs files before client teardown
ceph_destroy_client() tears down the monitor client before removing
the per-client debugfs files. A concurrent read of the monmap debugfs
file can enter monmap_show() after ceph_monc_stop() has freed
monc->monmap, triggering a use-after-free.
Remove the debugfs files before stopping the OSD and monitor clients.
debugfs_remove() drains active handlers and prevents new accesses, so
the debugfs callbacks can no longer race the rest of client teardown.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Linux | Linux |
Version: 76aa844d5b2fb8c839180d3f5874e333b297e5fd Version: 76aa844d5b2fb8c839180d3f5874e333b297e5fd Version: 76aa844d5b2fb8c839180d3f5874e333b297e5fd Version: 76aa844d5b2fb8c839180d3f5874e333b297e5fd Version: 76aa844d5b2fb8c839180d3f5874e333b297e5fd Version: 76aa844d5b2fb8c839180d3f5874e333b297e5fd Version: 76aa844d5b2fb8c839180d3f5874e333b297e5fd Version: 76aa844d5b2fb8c839180d3f5874e333b297e5fd |
||
{
"containers": {
"cna": {
"affected": [
{
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"product": "Linux",
"programFiles": [
"net/ceph/ceph_common.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
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"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "2.6.34"
},
{
"lessThan": "2.6.34",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"version": "5.10.265",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"version": "5.15.216",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.183",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.148",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.101",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.42",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.1.*",
"status": "unaffected",
"version": "7.1.6",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
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"versionStartIncluding": "2.6.34",
"vulnerable": true
},
{
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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\nlibceph: remove debugfs files before client teardown\n\nceph_destroy_client() tears down the monitor client before removing\nthe per-client debugfs files. A concurrent read of the monmap debugfs\nfile can enter monmap_show() after ceph_monc_stop() has freed\nmonc-\u003emonmap, triggering a use-after-free.\n\nRemove the debugfs files before stopping the OSD and monitor clients.\ndebugfs_remove() drains active handlers and prevents new accesses, so\nthe debugfs callbacks can no longer race the rest of client teardown."
}
],
"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"
},
"scenarios": [
{
"lang": "en",
"value": "AV:L - Exploitation requires local access to debugfs via read() on /sys/kernel/debug/ceph/client*/monmap concurrent with local ceph client teardown via umount or rbd unmap; the bug is not reachable through Ceph network protocol handlers.\nAC:L - The attacker controls both sides of the race by concurrently reading the monmap debugfs file while triggering ceph_destroy_client() via umount/rbd teardown, and can retry until the window between ceph_monc_stop() and debugfs removal is hit.\nPR:L - An unprivileged local user can use user-namespace capabilities (CAP_DAC_READ_SEARCH) to read root-owned debugfs files and race reads against libceph client teardown during automated volume detach or service restarts on Ceph storage nodes.\nUI:N - No victim user interaction is required; a local attacker can independently issue debugfs reads and trigger or time against client teardown without requiring another user to click, open files, or mount filesystems.\nS:U - The use-after-free corrupts kernel heap memory within the same kernel security domain and does not cross VM, container, or IOMMU boundaries; impact is standard kernel privilege escalation or crash.\nC:H - The use-after-free on monc-\u003emonmap permits reading freed heap memory containing monitor addresses and entity metadata, and UAF primitives are routinely leveraged for arbitrary kernel memory disclosure.\nI:H - Heap use-after-free on the variable-length ceph_monmap structure enables memory corruption that can be groomed into arbitrary kernel write primitives and local privilege escalation via control-flow hijacking.\nA:H - Concurrent access to freed monmap memory during debugfs iteration can cause kernel oops, BUG, or panic, and UAF corruption reliably threatens system availability even when full exploitation is not attempted."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-19T16:30:18.048Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/ac78549d186090ee7125d28c3a8c376573b36194"
},
{
"url": "https://git.kernel.org/stable/c/463a264e9094384112a5c8b46f0a9ddaf8566904"
},
{
"url": "https://git.kernel.org/stable/c/fe46b7e06f14f6f94766832df309b249cb689d27"
},
{
"url": "https://git.kernel.org/stable/c/fc1010e7e0204ece6cc0f9af4f473e9553535eab"
},
{
"url": "https://git.kernel.org/stable/c/d3dc8889d39a676bf840132bd5c5c48cb0daba23"
},
{
"url": "https://git.kernel.org/stable/c/8f5a3abc54ba24dbceb14cc3a719908c4f688091"
},
{
"url": "https://git.kernel.org/stable/c/b9fedda2f628e030384228de0dafc574b7fb0c2f"
},
{
"url": "https://git.kernel.org/stable/c/e4c804726c4afce3ba648b982d564f6af2cfa328"
}
],
"title": "libceph: remove debugfs files before client teardown",
"x_generator": {
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}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-68153",
"datePublished": "2026-08-10T11:59:19.302Z",
"dateReserved": "2026-07-30T09:28:09.371Z",
"dateUpdated": "2026-08-19T16:30:18.048Z",
"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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