CVE-2023-54267 (GCVE-0-2023-54267)
Vulnerability from cvelistv5
Published
2025-12-30 12:15
Modified
2025-12-30 12:15
Severity ?
VLAI Severity ?
EPSS score ?
Summary
In the Linux kernel, the following vulnerability has been resolved:
powerpc/pseries: Rework lppaca_shared_proc() to avoid DEBUG_PREEMPT
lppaca_shared_proc() takes a pointer to the lppaca which is typically
accessed through get_lppaca(). With DEBUG_PREEMPT enabled, this leads
to checking if preemption is enabled, for example:
BUG: using smp_processor_id() in preemptible [00000000] code: grep/10693
caller is lparcfg_data+0x408/0x19a0
CPU: 4 PID: 10693 Comm: grep Not tainted 6.5.0-rc3 #2
Call Trace:
dump_stack_lvl+0x154/0x200 (unreliable)
check_preemption_disabled+0x214/0x220
lparcfg_data+0x408/0x19a0
...
This isn't actually a problem however, as it does not matter which
lppaca is accessed, the shared proc state will be the same.
vcpudispatch_stats_procfs_init() already works around this by disabling
preemption, but the lparcfg code does not, erroring any time
/proc/powerpc/lparcfg is accessed with DEBUG_PREEMPT enabled.
Instead of disabling preemption on the caller side, rework
lppaca_shared_proc() to not take a pointer and instead directly access
the lppaca, bypassing any potential preemption checks.
[mpe: Rework to avoid needing a definition in paca.h and lppaca.h]
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Linux | Linux |
Version: f13c13a005127b5dc5daaca190277a062d946e63 Version: f13c13a005127b5dc5daaca190277a062d946e63 Version: f13c13a005127b5dc5daaca190277a062d946e63 Version: f13c13a005127b5dc5daaca190277a062d946e63 Version: f13c13a005127b5dc5daaca190277a062d946e63 Version: f13c13a005127b5dc5daaca190277a062d946e63 |
||
{
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"programFiles": [
"arch/powerpc/include/asm/lppaca.h",
"arch/powerpc/platforms/pseries/lpar.c",
"arch/powerpc/platforms/pseries/lparcfg.c",
"arch/powerpc/platforms/pseries/setup.c",
"drivers/cpuidle/cpuidle-pseries.c"
],
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"arch/powerpc/platforms/pseries/lpar.c",
"arch/powerpc/platforms/pseries/lparcfg.c",
"arch/powerpc/platforms/pseries/setup.c",
"drivers/cpuidle/cpuidle-pseries.c"
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"vendor": "Linux",
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"status": "unaffected",
"version": "0",
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},
{
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"status": "unaffected",
"version": "5.10.195",
"versionType": "semver"
},
{
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"status": "unaffected",
"version": "5.15.132",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.53",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.4.*",
"status": "unaffected",
"version": "6.4.16",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.5.*",
"status": "unaffected",
"version": "6.5.3",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "6.6",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
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"nodes": [
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"descriptions": [
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\npowerpc/pseries: Rework lppaca_shared_proc() to avoid DEBUG_PREEMPT\n\nlppaca_shared_proc() takes a pointer to the lppaca which is typically\naccessed through get_lppaca(). With DEBUG_PREEMPT enabled, this leads\nto checking if preemption is enabled, for example:\n\n BUG: using smp_processor_id() in preemptible [00000000] code: grep/10693\n caller is lparcfg_data+0x408/0x19a0\n CPU: 4 PID: 10693 Comm: grep Not tainted 6.5.0-rc3 #2\n Call Trace:\n dump_stack_lvl+0x154/0x200 (unreliable)\n check_preemption_disabled+0x214/0x220\n lparcfg_data+0x408/0x19a0\n ...\n\nThis isn\u0027t actually a problem however, as it does not matter which\nlppaca is accessed, the shared proc state will be the same.\nvcpudispatch_stats_procfs_init() already works around this by disabling\npreemption, but the lparcfg code does not, erroring any time\n/proc/powerpc/lparcfg is accessed with DEBUG_PREEMPT enabled.\n\nInstead of disabling preemption on the caller side, rework\nlppaca_shared_proc() to not take a pointer and instead directly access\nthe lppaca, bypassing any potential preemption checks.\n\n[mpe: Rework to avoid needing a definition in paca.h and lppaca.h]"
}
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"providerMetadata": {
"dateUpdated": "2025-12-30T12:15:58.914Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
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},
{
"url": "https://git.kernel.org/stable/c/2935443dc9c28499223d8c881474259e4b998f2a"
},
{
"url": "https://git.kernel.org/stable/c/4c8568cf4c45b415854195c8832b557cdefba57a"
},
{
"url": "https://git.kernel.org/stable/c/3c5e8e666794d7dde6d14ea846c6c04f2bb34900"
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{
"url": "https://git.kernel.org/stable/c/f45ee5c074013a0fbfce77a5af5efddb01f5d4f4"
},
{
"url": "https://git.kernel.org/stable/c/eac030b22ea12cdfcbb2e941c21c03964403c63f"
}
],
"title": "powerpc/pseries: Rework lppaca_shared_proc() to avoid DEBUG_PREEMPT",
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"cveId": "CVE-2023-54267",
"datePublished": "2025-12-30T12:15:58.914Z",
"dateReserved": "2025-12-30T12:06:44.518Z",
"dateUpdated": "2025-12-30T12:15:58.914Z",
"state": "PUBLISHED"
},
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}
}
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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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