CVE-2023-52451— powerpc/pseries/memhp: Fix access beyond end of drmem array
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I. Basic Information for CVE-2023-52451
Vulnerability Information
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Vulnerability Title
powerpc/pseries/memhp: Fix access beyond end of drmem array
Source: NVD (National Vulnerability Database)
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: powerpc/pseries/memhp: Fix access beyond end of drmem array dlpar_memory_remove_by_index() may access beyond the bounds of the drmem lmb array when the LMB lookup fails to match an entry with the given DRC index. When the search fails, the cursor is left pointing to &drmem_info->lmbs[drmem_info->n_lmbs], which is one element past the last valid entry in the array. The debug message at the end of the function then dereferences this pointer: pr_debug("Failed to hot-remove memory at %llx\n", lmb->base_addr); This was found by inspection and confirmed with KASAN: pseries-hotplug-mem: Attempting to hot-remove LMB, drc index 1234 ================================================================== BUG: KASAN: slab-out-of-bounds in dlpar_memory+0x298/0x1658 Read of size 8 at addr c000000364e97fd0 by task bash/949 dump_stack_lvl+0xa4/0xfc (unreliable) print_report+0x214/0x63c kasan_report+0x140/0x2e0 __asan_load8+0xa8/0xe0 dlpar_memory+0x298/0x1658 handle_dlpar_errorlog+0x130/0x1d0 dlpar_store+0x18c/0x3e0 kobj_attr_store+0x68/0xa0 sysfs_kf_write+0xc4/0x110 kernfs_fop_write_iter+0x26c/0x390 vfs_write+0x2d4/0x4e0 ksys_write+0xac/0x1a0 system_call_exception+0x268/0x530 system_call_vectored_common+0x15c/0x2ec Allocated by task 1: kasan_save_stack+0x48/0x80 kasan_set_track+0x34/0x50 kasan_save_alloc_info+0x34/0x50 __kasan_kmalloc+0xd0/0x120 __kmalloc+0x8c/0x320 kmalloc_array.constprop.0+0x48/0x5c drmem_init+0x2a0/0x41c do_one_initcall+0xe0/0x5c0 kernel_init_freeable+0x4ec/0x5a0 kernel_init+0x30/0x1e0 ret_from_kernel_user_thread+0x14/0x1c The buggy address belongs to the object at c000000364e80000 which belongs to the cache kmalloc-128k of size 131072 The buggy address is located 0 bytes to the right of allocated 98256-byte region [c000000364e80000, c000000364e97fd0) ================================================================== pseries-hotplug-mem: Failed to hot-remove memory at 0 Log failed lookups with a separate message and dereference the cursor only when it points to a valid entry.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于dlpar_memory_remove_by_index()可能会访问超出 drmem lmb 数组的范围。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
II. Public POCs for CVE-2023-52451
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Same Patch Batch · Linux · 2024-02-22 · 17 CVEs total
| CVE-2024-26592 | ksmbd: fix UAF issue in ksmbd_tcp_new_connection() | |
| CVE-2024-26591 | bpf: Fix re-attachment branch in bpf_tracing_prog_attach | |
| CVE-2023-52452 | bpf: Fix accesses to uninit stack slots | |
| CVE-2023-52450 | perf/x86/intel/uncore: Fix NULL pointer dereference issue in upi_fill_topology() | |
| CVE-2023-52449 | mtd: Fix gluebi NULL pointer dereference caused by ftl notifier | |
| CVE-2023-52448 | gfs2: Fix kernel NULL pointer dereference in gfs2_rgrp_dump | |
| CVE-2023-52447 | bpf: Defer the free of inner map when necessary | |
| CVE-2023-52446 | bpf: Fix a race condition between btf_put() and map_free() | |
| CVE-2023-52445 | media: pvrusb2: fix use after free on context disconnection | |
| CVE-2023-52444 | f2fs: fix to avoid dirent corruption | |
| CVE-2024-26589 | bpf: Reject variable offset alu on PTR_TO_FLOW_KEYS | |
| CVE-2024-26590 | erofs: fix inconsistent per-file compression format | |
| CVE-2024-26588 | LoongArch: BPF: Prevent out-of-bounds memory access | |
| CVE-2024-26586 | mlxsw: spectrum_acl_tcam: Fix stack corruption | |
| CVE-2024-26587 | net: netdevsim: don't try to destroy PHC on VFs | |
| CVE-2023-52443 | apparmor: avoid crash when parsed profile name is empty |
IV. Related Vulnerabilities
Same product: Linux
- CVE-2026-43500
rxrpc: Also unshare DATA/RESPONSE packets when paged frags a - CVE-2026-43475
scsi: storvsc: Fix scheduling while atomic on PREEMPT_RT - CVE-2026-43474
fs: init flags_valid before calling vfs_fileattr_get - CVE-2026-43473
scsi: mpi3mr: Add NULL checks when resetting request and rep - CVE-2026-43472
unshare: fix unshare_fs() handling
Same vendor: Linux
- CVE-2026-43500
rxrpc: Also unshare DATA/RESPONSE packets when paged frags a - CVE-2026-43475
scsi: storvsc: Fix scheduling while atomic on PREEMPT_RT - CVE-2026-43474
fs: init flags_valid before calling vfs_fileattr_get - CVE-2026-43473
scsi: mpi3mr: Add NULL checks when resetting request and rep - CVE-2026-43472
unshare: fix unshare_fs() handling
V. Comments for CVE-2023-52451
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