{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2023-54267","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2025-12-30T12:06:44.518Z","datePublished":"2025-12-30T12:15:58.914Z","dateUpdated":"2026-05-11T19:58:40.112Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-05-11T19:58:40.112Z"},"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't 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]"}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","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"],"versions":[{"version":"f13c13a005127b5dc5daaca190277a062d946e63","lessThan":"953c54dfdc5d3eb7243ed902b50acb5ea1db4355","status":"affected","versionType":"git"},{"version":"f13c13a005127b5dc5daaca190277a062d946e63","lessThan":"2935443dc9c28499223d8c881474259e4b998f2a","status":"affected","versionType":"git"},{"version":"f13c13a005127b5dc5daaca190277a062d946e63","lessThan":"4c8568cf4c45b415854195c8832b557cdefba57a","status":"affected","versionType":"git"},{"version":"f13c13a005127b5dc5daaca190277a062d946e63","lessThan":"3c5e8e666794d7dde6d14ea846c6c04f2bb34900","status":"affected","versionType":"git"},{"version":"f13c13a005127b5dc5daaca190277a062d946e63","lessThan":"f45ee5c074013a0fbfce77a5af5efddb01f5d4f4","status":"affected","versionType":"git"},{"version":"f13c13a005127b5dc5daaca190277a062d946e63","lessThan":"eac030b22ea12cdfcbb2e941c21c03964403c63f","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","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"],"versions":[{"version":"3.12","status":"affected"},{"version":"0","lessThan":"3.12","status":"unaffected","versionType":"semver"},{"version":"5.10.195","lessThanOrEqual":"5.10.*","status":"unaffected","versionType":"semver"},{"version":"5.15.132","lessThanOrEqual":"5.15.*","status":"unaffected","versionType":"semver"},{"version":"6.1.53","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.4.16","lessThanOrEqual":"6.4.*","status":"unaffected","versionType":"semver"},{"version":"6.5.3","lessThanOrEqual":"6.5.*","status":"unaffected","versionType":"semver"},{"version":"6.6","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.12","versionEndExcluding":"5.10.195"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.12","versionEndExcluding":"5.15.132"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.12","versionEndExcluding":"6.1.53"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.12","versionEndExcluding":"6.4.16"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.12","versionEndExcluding":"6.5.3"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.12","versionEndExcluding":"6.6"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/953c54dfdc5d3eb7243ed902b50acb5ea1db4355"},{"url":"https://git.kernel.org/stable/c/2935443dc9c28499223d8c881474259e4b998f2a"},{"url":"https://git.kernel.org/stable/c/4c8568cf4c45b415854195c8832b557cdefba57a"},{"url":"https://git.kernel.org/stable/c/3c5e8e666794d7dde6d14ea846c6c04f2bb34900"},{"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","x_generator":{"engine":"bippy-1.2.0"}}}}