{"id":"CVE-2024-56701","summary":"powerpc/pseries: Fix dtl_access_lock to be a rw_semaphore","details":"In the Linux kernel, the following vulnerability has been resolved:\n\npowerpc/pseries: Fix dtl_access_lock to be a rw_semaphore\n\nThe dtl_access_lock needs to be a rw_sempahore, a sleeping lock, because\nthe code calls kmalloc() while holding it, which can sleep:\n\n  # echo 1 \u003e /proc/powerpc/vcpudispatch_stats\n  BUG: sleeping function called from invalid context at include/linux/sched/mm.h:337\n  in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 199, name: sh\n  preempt_count: 1, expected: 0\n  3 locks held by sh/199:\n   #0: c00000000a0743f8 (sb_writers#3){.+.+}-{0:0}, at: vfs_write+0x324/0x438\n   #1: c0000000028c7058 (dtl_enable_mutex){+.+.}-{3:3}, at: vcpudispatch_stats_write+0xd4/0x5f4\n   #2: c0000000028c70b8 (dtl_access_lock){+.+.}-{2:2}, at: vcpudispatch_stats_write+0x220/0x5f4\n  CPU: 0 PID: 199 Comm: sh Not tainted 6.10.0-rc4 #152\n  Hardware name: IBM pSeries (emulated by qemu) POWER9 (raw) 0x4e1202 0xf000005 of:SLOF,HEAD hv:linux,kvm pSeries\n  Call Trace:\n    dump_stack_lvl+0x130/0x148 (unreliable)\n    __might_resched+0x174/0x410\n    kmem_cache_alloc_noprof+0x340/0x3d0\n    alloc_dtl_buffers+0x124/0x1ac\n    vcpudispatch_stats_write+0x2a8/0x5f4\n    proc_reg_write+0xf4/0x150\n    vfs_write+0xfc/0x438\n    ksys_write+0x88/0x148\n    system_call_exception+0x1c4/0x5a0\n    system_call_common+0xf4/0x258","modified":"2026-03-12T17:22:53.372056Z","published":"2024-12-28T09:46:23.516Z","related":["SUSE-SU-2025:0289-1","SUSE-SU-2025:0428-1","SUSE-SU-2025:0499-1","SUSE-SU-2025:0556-1","SUSE-SU-2025:0557-1","SUSE-SU-2025:0577-1","SUSE-SU-2025:0577-2","USN-7276-1","USN-7277-1"],"database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/56xxx/CVE-2024-56701.json","cna_assigner":"Linux"},"references":[{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"},{"type":"WEB","url":"https://git.kernel.org/stable/c/525e18f1ba7c2b098c8ba587fb397efb34a6574c"},{"type":"WEB","url":"https://git.kernel.org/stable/c/6956c0e7346ce1bbfc726755aa8da10d26e84276"},{"type":"WEB","url":"https://git.kernel.org/stable/c/a246daa26b717e755ccc9061f47f7cd1c0b358dd"},{"type":"WEB","url":"https://git.kernel.org/stable/c/b125d0cf1adde7b2b47d7337fed7e9133eea3463"},{"type":"WEB","url":"https://git.kernel.org/stable/c/cadae3a45d23aa4f6485938a67cbc47aaaa25e38"},{"type":"WEB","url":"https://git.kernel.org/stable/c/f6ec133668757f84e5143f1eb141fd0b83778b9e"},{"type":"WEB","url":"https://git.kernel.org/stable/c/fa5b5ea257135e771b489c83a2e93b5935d0108e"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/56xxx/CVE-2024-56701.json"},{"type":"WEB","url":"https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2024-56701"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"06220d78f24a20549757be1014e57c382406cc92"},{"fixed":"6956c0e7346ce1bbfc726755aa8da10d26e84276"},{"fixed":"f6ec133668757f84e5143f1eb141fd0b83778b9e"},{"fixed":"fa5b5ea257135e771b489c83a2e93b5935d0108e"},{"fixed":"a246daa26b717e755ccc9061f47f7cd1c0b358dd"},{"fixed":"b125d0cf1adde7b2b47d7337fed7e9133eea3463"},{"fixed":"525e18f1ba7c2b098c8ba587fb397efb34a6574c"},{"fixed":"cadae3a45d23aa4f6485938a67cbc47aaaa25e38"}]}],"versions":["v5.10","v5.10-rc1","v5.10-rc2","v5.10-rc3","v5.10-rc4","v5.10-rc5","v5.10-rc6","v5.10-rc7","v5.10.1","v5.10.10","v5.10.100","v5.10.101","v5.10.102","v5.10.103","v5.10.104","v5.10.105","v5.10.106","v5.10.107","v5.10.108","v5.10.109","v5.10.11","v5.10.110","v5.10.111","v5.10.112","v5.10.113","v5.10.114","v5.10.115","v5.10.116","v5.10.117","v5.10.118","v5.10.119","v5.10.12","v5.10.120","v5.10.121","v5.10.122","v5.10.123","v5.10.124","v5.10.125","v5.10.126","v5.10.127","v5.10.128","v5.10.129","v5.10.13","v5.10.130","v5.10.131","v5.10.132","v5.10.133","v5.10.134","v5.10.135","v5.10.136","v5.10.137","v5.10.138","v5.10.139","v5.10.14","v5.10.140","v5.10.141","v5.10.142","v5.10.143","v5.10.144","v5.10.145","v5.10.146","v5.10.147","v5.10.148","v5.10.149","v5.10.15","v5.10.150","v5.10.151","v5.10.152","v5.10.153","v5.10.154","v5.10.155","v5.10.156","v5.10.157","v5.10.158","v5.10.159","v5.10.16","v5.10.160","v5.10.161","v5.10.162","v5.10.163","v5.10.164","v5.10.165","v5.10.166","v5.10.167","v5.10.168","v5.10.169","v5.10.17","v5.10.170","v5.10.171","v5.10.172","v5.10.173","v5.10.174","v5.10.175","v5.10.176","v5.10.177","v5.10.178","v5.10.179","v5.10.18","v5.10.180","v5.10.181","v5.10.182","v5.10.183","v5.10.184","v5.10.185","v5.10.186","v5.10.187","v5.10.188","v5.10.189","v5.10.19","v5.10.190","v5.10.191","v5.10.192","v5.10.193","v5.10.194","v5.10.195","v5.10.196","v5.10.197","v5.10.198","v5.10.199","v5.10.2","v5.10.20","v5.10.200","v5.10.201","v5.10.202","v5.10.203","v5.10.204","v5.10.205","v5.10.206","v5.10.207","v5.10.208","v5.10.209","v5.10.21","v5.10.210","v5.10.211","v5.10.212","v5.10.213","v5.10.214","v5.10.215","v5.10.216","v5.10.217","v5.10.218","v5.10.219","v5.10.22","v5.10.220","v5.10.221","v5.10.222","v5.10.223","v5.10.224","v5.10.225","v5.10.226","v5.10.227","v5.10.228","v5.10.229","v5.10.23","v5.10.230","v5.10.24","v5.10.25","v5.10.26","v5.10.27","v5.10.28","v5.10.29","v5.10.3","v5.10.30","v5.10.31","v5.10.32","v5.10.33","v5.10.34","v5.10.35","v5.10.36","v5.10.37","v5.10.38","v5.10.39","v5.10.4","v5.10.40","v5.10.41","v5.10.42","v5.10.43","v5.10.44","v5.10.45","v5.10.46","v5.10.47","v5.10.48","v5.10.49","v5.10.5","v5.10.50","v5.10.51","v5.10.52","v5.10.53","v5.10.54","v5.10.55","v5.10.56","v5.10.57","v5.10.58","v5.10.59","v5.10.6","v5.10.60","v5.10.61","v5.10.62","v5.10.63","v5.10.64","v5.10.65","v5.10.66","v5.10.67","v5.10.68","v5.10.69","v5.10.7","v5.10.70","v5.10.71","v5.10.72","v5.10.73","v5.10.74","v5.10.75","v5.10.76","v5.10.77","v5.10.78","v5.10.79","v5.10.8","v5.10.80","v5.10.81","v5.10.82","v5.10.83","v5.10.84","v5.10.85","v5.10.86","v5.10.87","v5.10.88","v5.10.89","v5.10.9","v5.10.90","v5.10.91","v5.10.92","v5.10.93","v5.10.94","v5.10.95","v5.10.96","v5.10.97","v5.10.98","v5.10.99","v5.11","v5.11-rc1","v5.11-rc2","v5.11-rc3","v5.11-rc4","v5.11-rc5","v5.11-rc6","v5.11-rc7","v5.12","v5.12-rc1","v5.12-rc1-dontuse","v5.12-rc2","v5.12-rc3","v5.12-rc4","v5.12-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