In the Linux kernel, the following vulnerability has been resolved:
powerpc/iommu: Fix the missing iommu_group_put() during platform domain
attach The function spapr_tce_platform_iommu_attach_dev() is missing to
call iommu_group_put() when the domain is already set. This refcount leak
shows up with BUG_ON() during DLPAR remove operation as: KernelBug: Kernel
bug in state ‘None’: kernel BUG at
arch/powerpc/platforms/pseries/iommu.c:100! Oops: Exception in kernel mode,
sig: 5 [#1] LE PAGE_SIZE=64K MMU=Radix SMP NR_CPUS=8192 NUMA pSeries <snip>
Hardware name: IBM,9080-HEX POWER10 (raw) 0x800200 0xf000006
of:IBM,FW1060.00 (NH1060_016) hv:phyp pSeries NIP: c0000000000ff4d4 LR:
c0000000000ff4cc CTR: 0000000000000000 REGS: c0000013aed5f840 TRAP: 0700
Tainted: G I (6.8.0-rc3-autotest-g99bd3cb0d12e) MSR: 8000000000029033
<SF,EE,ME,IR,DR,RI,LE> CR: 44002402 XER: 20040000 CFAR: c000000000a0d170
IRQMASK: 0 … NIP iommu_reconfig_notifier+0x94/0x200 LR
iommu_reconfig_notifier+0x8c/0x200 Call Trace:
iommu_reconfig_notifier+0x8c/0x200 (unreliable)
notifier_call_chain+0xb8/0x19c blocking_notifier_call_chain+0x64/0x98
of_reconfig_notify+0x44/0xdc of_detach_node+0x78/0xb0
ofdt_write.part.0+0x86c/0xbb8 proc_reg_write+0xf4/0x150
vfs_write+0xf8/0x488 ksys_write+0x84/0x140
system_call_exception+0x138/0x330 system_call_vectored_common+0x15c/0x2ec
The patch adds the missing iommu_group_put() call.
git.kernel.org/linus/0846dd77c8349ec92ca0079c9c71d130f34cb192 (6.8-rc5)
git.kernel.org/stable/c/0846dd77c8349ec92ca0079c9c71d130f34cb192
git.kernel.org/stable/c/c90fdea9cac9eb419fc266e75d625cb60c8f7f6c
launchpad.net/bugs/cve/CVE-2024-26709
nvd.nist.gov/vuln/detail/CVE-2024-26709
security-tracker.debian.org/tracker/CVE-2024-26709
www.cve.org/CVERecord?id=CVE-2024-26709