{"id":"CVE-2024-26709","summary":"powerpc/iommu: Fix the missing iommu_group_put() during platform domain attach","details":"In the Linux kernel, the following vulnerability has been resolved:\n\npowerpc/iommu: Fix the missing iommu_group_put() during platform domain attach\n\nThe function spapr_tce_platform_iommu_attach_dev() is missing to call\niommu_group_put() when the domain is already set. This refcount leak\nshows up with BUG_ON() during DLPAR remove operation as:\n\n  KernelBug: Kernel bug in state 'None': kernel BUG at arch/powerpc/platforms/pseries/iommu.c:100!\n  Oops: Exception in kernel mode, sig: 5 [#1]\n  LE PAGE_SIZE=64K MMU=Radix SMP NR_CPUS=8192 NUMA pSeries\n  \u003csnip\u003e\n  Hardware name: IBM,9080-HEX POWER10 (raw) 0x800200 0xf000006 of:IBM,FW1060.00 (NH1060_016) hv:phyp pSeries\n  NIP:  c0000000000ff4d4 LR: c0000000000ff4cc CTR: 0000000000000000\n  REGS: c0000013aed5f840 TRAP: 0700   Tainted: G          I         (6.8.0-rc3-autotest-g99bd3cb0d12e)\n  MSR:  8000000000029033 \u003cSF,EE,ME,IR,DR,RI,LE\u003e  CR: 44002402  XER: 20040000\n  CFAR: c000000000a0d170 IRQMASK: 0\n  ...\n  NIP iommu_reconfig_notifier+0x94/0x200\n  LR  iommu_reconfig_notifier+0x8c/0x200\n  Call Trace:\n    iommu_reconfig_notifier+0x8c/0x200 (unreliable)\n    notifier_call_chain+0xb8/0x19c\n    blocking_notifier_call_chain+0x64/0x98\n    of_reconfig_notify+0x44/0xdc\n    of_detach_node+0x78/0xb0\n    ofdt_write.part.0+0x86c/0xbb8\n    proc_reg_write+0xf4/0x150\n    vfs_write+0xf8/0x488\n    ksys_write+0x84/0x140\n    system_call_exception+0x138/0x330\n    system_call_vectored_common+0x15c/0x2ec\n\nThe patch adds the missing iommu_group_put() call.","modified":"2026-04-02T10:05:40.120762Z","published":"2024-04-03T14:55:11.868Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/26xxx/CVE-2024-26709.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/0846dd77c8349ec92ca0079c9c71d130f34cb192"},{"type":"WEB","url":"https://git.kernel.org/stable/c/c90fdea9cac9eb419fc266e75d625cb60c8f7f6c"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/26xxx/CVE-2024-26709.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2024-26709"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"a8ca9fc9134c1a43e6d4db7ff59496bbd7075def"},{"fixed":"c90fdea9cac9eb419fc266e75d625cb60c8f7f6c"},{"fixed":"0846dd77c8349ec92ca0079c9c71d130f34cb192"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2024-26709.json"}}],"schema_version":"1.7.5"}