{"id":"DEBIAN-CVE-2023-54267","details":"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]","modified":"2026-09-15T08:47:37.715088515Z","published":"2025-12-30T13:16:15.517Z","upstream":["CVE-2023-54267"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2023-54267"}],"affected":[{"package":{"name":"linux","ecosystem":"Debian:12","purl":"pkg:deb/debian/linux?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.1.55-1"}]}],"versions":["6.1.27-1","6.1.37-1","6.1.38-1","6.1.38-2","6.1.38-2~bpo11+1","6.1.38-3","6.1.38-4","6.1.38-4~bpo11+1","6.1.52-1","6.1.55-1~bpo11+1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2023-54267.json"}},{"package":{"name":"linux","ecosystem":"Debian:13","purl":"pkg:deb/debian/linux?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.5.3-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2023-54267.json"}},{"package":{"name":"linux","ecosystem":"Debian:14","purl":"pkg:deb/debian/linux?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.5.3-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2023-54267.json"}}],"schema_version":"1.9.0"}