{"id":"CVE-2024-56701","title":"powerpc/pseries: Fix dtl_access_lock to be a rw_semaphore","summary":"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 holdi…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= 06220d78f24a20549757be1014e57c382406cc92 < 6956c0e7346ce1bbfc726755aa8da10d26e84276","Linux >= 06220d78f24a20549757be1014e57c382406cc92 < f6ec133668757f84e5143f1eb141fd0b83778b9e","Linux >= 06220d78f24a20549757be1014e57c382406cc92 < fa5b5ea257135e771b489c83a2e93b5935d0108e","Linux >= 06220d78f24a20549757be1014e57c382406cc92 < a246daa26b717e755ccc9061f47f7cd1c0b358dd","Linux >= 06220d78f24a20549757be1014e57c382406cc92 < b125d0cf1adde7b2b47d7337fed7e9133eea3463","Linux >= 06220d78f24a20549757be1014e57c382406cc92 < 525e18f1ba7c2b098c8ba587fb397efb34a6574c","Linux >= 06220d78f24a20549757be1014e57c382406cc92 < cadae3a45d23aa4f6485938a67cbc47aaaa25e38","Linux 5.3"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-11-05T20:29:56.658433Z"},"published":"2024-12-28","updated":"2026-11-05","sourceUpdated":"2026-11-05T20:31:26.017Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2024-56701","references":[{"url":"https://git.kernel.org/stable/c/6956c0e7346ce1bbfc726755aa8da10d26e84276"},{"url":"https://git.kernel.org/stable/c/f6ec133668757f84e5143f1eb141fd0b83778b9e"},{"url":"https://git.kernel.org/stable/c/fa5b5ea257135e771b489c83a2e93b5935d0108e"},{"url":"https://git.kernel.org/stable/c/a246daa26b717e755ccc9061f47f7cd1c0b358dd"},{"url":"https://git.kernel.org/stable/c/b125d0cf1adde7b2b47d7337fed7e9133eea3463"},{"url":"https://git.kernel.org/stable/c/525e18f1ba7c2b098c8ba587fb397efb34a6574c"},{"url":"https://git.kernel.org/stable/c/cadae3a45d23aa4f6485938a67cbc47aaaa25e38"}],"tags":["cve.org"],"epss":0.00208,"epssPercentile":0.10931,"ingestedAt":"2026-11-05T22:38:31.838Z","slug":"CVE-2024-56701","body":"## Overview\n\nIn 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 > /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\n\n## Affected\n\n- `Linux >= 06220d78f24a20549757be1014e57c382406cc92 < 6956c0e7346ce1bbfc726755aa8da10d26e84276`\n- `Linux >= 06220d78f24a20549757be1014e57c382406cc92 < f6ec133668757f84e5143f1eb141fd0b83778b9e`\n- `Linux >= 06220d78f24a20549757be1014e57c382406cc92 < fa5b5ea257135e771b489c83a2e93b5935d0108e`\n- `Linux >= 06220d78f24a20549757be1014e57c382406cc92 < a246daa26b717e755ccc9061f47f7cd1c0b358dd`\n- `Linux >= 06220d78f24a20549757be1014e57c382406cc92 < b125d0cf1adde7b2b47d7337fed7e9133eea3463`\n- `Linux >= 06220d78f24a20549757be1014e57c382406cc92 < 525e18f1ba7c2b098c8ba587fb397efb34a6574c`\n- `Linux >= 06220d78f24a20549757be1014e57c382406cc92 < cadae3a45d23aa4f6485938a67cbc47aaaa25e38`\n- `Linux 5.3`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}