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CVE-2023-54267 (GCVE-0-2023-54267)

Vulnerability from cvelistv5 – Published: 2025-12-30 12:15 – Updated: 2026-05-11 19:58
VLAI
Title
powerpc/pseries: Rework lppaca_shared_proc() to avoid DEBUG_PREEMPT
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]
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: f13c13a005127b5dc5daaca190277a062d946e63 , < 953c54dfdc5d3eb7243ed902b50acb5ea1db4355 (git)
Affected: f13c13a005127b5dc5daaca190277a062d946e63 , < 2935443dc9c28499223d8c881474259e4b998f2a (git)
Affected: f13c13a005127b5dc5daaca190277a062d946e63 , < 4c8568cf4c45b415854195c8832b557cdefba57a (git)
Affected: f13c13a005127b5dc5daaca190277a062d946e63 , < 3c5e8e666794d7dde6d14ea846c6c04f2bb34900 (git)
Affected: f13c13a005127b5dc5daaca190277a062d946e63 , < f45ee5c074013a0fbfce77a5af5efddb01f5d4f4 (git)
Affected: f13c13a005127b5dc5daaca190277a062d946e63 , < eac030b22ea12cdfcbb2e941c21c03964403c63f (git)
guessed Create a notification for this product.
Linux Linux Affected: 3.12
Unaffected: 0 , < 3.12 (semver)
Unaffected: 5.10.195 , ≤ 5.10.* (semver)
Unaffected: 5.15.132 , ≤ 5.15.* (semver)
Unaffected: 6.1.53 , ≤ 6.1.* (semver)
Unaffected: 6.4.16 , ≤ 6.4.* (semver)
Unaffected: 6.5.3 , ≤ 6.5.* (semver)
Unaffected: 6.6 , ≤ * (original_commit_for_fix)
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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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    "datePublished": "2025-12-30T12:15:58.914Z",
    "dateReserved": "2025-12-30T12:06:44.518Z",
    "dateUpdated": "2026-05-11T19:58:40.112Z",
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      "date": "2026-09-14",
      "epss": "0.0021",
      "percentile": "0.11356"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2023-54267\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-12-30T13:16:15.517\",\"lastModified\":\"2026-06-17T06:47:07.517\",\"vulnStatus\":\"Deferred\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"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]\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\\n\\npowerpc/pseries: Reestructurar lppaca_shared_proc() para evitar DEBUG_PREEMPT\\n\\nlppaca_shared_proc() toma un puntero al lppaca al que se accede t\u00edpicamente a trav\u00e9s de get_lppaca(). Con DEBUG_PREEMPT habilitado, esto lleva a verificar si la preemptibilidad est\u00e1 habilitada, por ejemplo:\\n\\n  BUG: usando smp_processor_id() en c\u00f3digo preemptible [00000000]: grep/10693\\n  el llamador es lparcfg_data+0x408/0x19a0\\n  CPU: 4 PID: 10693 Comm: grep No contaminado 6.5.0-rc3 #2\\n  Traza de Llamadas:\\n    dump_stack_lvl+0x154/0x200 (no fiable)\\n    check_preemption_disabled+0x214/0x220\\n    lparcfg_data+0x408/0x19a0\\n    ...\\n\\nEsto no es realmente un problema, sin embargo, ya que no importa qu\u00e9 lppaca se acceda, el estado compartido del proceso ser\u00e1 el mismo. vcpudispatch_stats_procfs_init() ya soluciona esto deshabilitando la preemptibilidad, pero el c\u00f3digo lparcfg no lo hace, generando un error cada vez que se accede a /proc/powerpc/lparcfg con DEBUG_PREEMPT habilitado.\\n\\nEn lugar de deshabilitar la preemptibilidad en el lado del llamador, reestructurar lppaca_shared_proc() para que no tome un puntero y en su lugar acceda directamente al lppaca, evitando cualquier posible verificaci\u00f3n de preemptibilidad.\\n\\n[mpe: Reestructurar para evitar la necesidad de una definici\u00f3n en paca.h y lppaca.h]\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"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\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"f13c13a005127b5dc5daaca190277a062d946e63\",\"lessThan\":\"953c54dfdc5d3eb7243ed902b50acb5ea1db4355\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"f13c13a005127b5dc5daaca190277a062d946e63\",\"lessThan\":\"2935443dc9c28499223d8c881474259e4b998f2a\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"f13c13a005127b5dc5daaca190277a062d946e63\",\"lessThan\":\"4c8568cf4c45b415854195c8832b557cdefba57a\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"f13c13a005127b5dc5daaca190277a062d946e63\",\"lessThan\":\"3c5e8e666794d7dde6d14ea846c6c04f2bb34900\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"f13c13a005127b5dc5daaca190277a062d946e63\",\"lessThan\":\"f45ee5c074013a0fbfce77a5af5efddb01f5d4f4\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"f13c13a005127b5dc5daaca190277a062d946e63\",\"lessThan\":\"eac030b22ea12cdfcbb2e941c21c03964403c63f\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"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\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"3.12\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"3.12\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.195\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.132\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.53\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.4.16\",\"lessThanOrEqual\":\"6.4.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.5.3\",\"lessThanOrEqual\":\"6.5.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/2935443dc9c28499223d8c881474259e4b998f2a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/3c5e8e666794d7dde6d14ea846c6c04f2bb34900\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/4c8568cf4c45b415854195c8832b557cdefba57a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/953c54dfdc5d3eb7243ed902b50acb5ea1db4355\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/eac030b22ea12cdfcbb2e941c21c03964403c63f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f45ee5c074013a0fbfce77a5af5efddb01f5d4f4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-06-30T10:13:52+00:00",
      "cve": "CVE-2023-54267",
      "id": "CVE-2023-54267",
      "initial_release_date": "2023-01-01T00:00:00+00:00",
      "product_status:fixed": "280",
      "product_status:known_affected": "112",
      "product_status:known_not_affected": "84",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: powerpc/pseries: Rework lppaca_shared_proc() to avoid DEBUG_PREEMPT",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2023/cve-2023-54267.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-02T01:40:20Z",
      "cve": "CVE-2023-54267",
      "id": "CVE-2023-54267",
      "initial_release_date": "2025-12-31T00:27:07Z",
      "product_status:known_affected": "629",
      "product_status:known_not_affected": "75",
      "product_status:recommended": "299",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2023-54267",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2023-54267.json",
      "version": "34"
    }
  }
}



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