CVE-2023-52451

powerpc/pseries/memhp: Fix access beyond end of drmem array

HIGH

7.8

CVSS Score

Published: February 22, 2024 at 04:21 PM UTC

Updated: June 17, 2026 at 06:42 AM UTC

1 product affected across 1 vendorLinux Kernel

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Severity

HIGH7.8

Exploit prediction

EPSS 0.2%

SSVC

No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Linux Kernel · Linux

95%

4.1 ≤ v < 4.19.3064.1 ≤ v < 5.10.2094.1 ≤ v < 5.15.1484.1 ≤ v < 5.4.2684.1 ≤ v < 6.1.754.1 ≤ v < 6.6.144.1 ≤ v < 6.7.24.1 ≤ v < 6.84.1.0 ≤ v < 4.19.3064.20.0 ≤ v < 5.4.2685.11.0 ≤ v < 5.15.1485.16.0 ≤ v < 6.1.755.5.0 ≤ v < 5.10.2096.2.0 ≤ v < 6.6.146.7.0 ≤ v < 6.7.24.151925fb3c5c901aa06cdc853268a6e19e19bcdc7

Vendor states this is fixed in 026fd977dc50ff4a5e09bfb0603557f104d3f3a0 (fixed)

Vendor states this is fixed in 708a4b59baad96c4718dc0bd3a3427d3ab22fedc (fixed)

Vendor states this is fixed in 999a27b3ce9a69d54ccd5db000ec3a447bc43e6d (fixed)

Vendor states this is fixed in 9b5f03500bc5b083c0df696d7dd169d7ef3dd0c7 (fixed)

Vendor states this is fixed in b582aa1f66411d4adcc1aa55b8c575683fb4687e (fixed)

Vendor states this is fixed in bb79613a9a704469ddb8d6c6029d532a5cea384c (fixed)

Vendor states this is fixed in bd68ffce69f6cf8ddd3a3c32549d1d2275e49fc5 (fixed)

Vendor states this is fixed in df16afba2378d985359812c865a15c05c70a967e (fixed)

Vendor states this is fixed in 4.1 (unaffected)

Vendor states this is fixed in 4.19.306 (unaffected)

Vendor states this is fixed in 5.10.209 (unaffected)

Vendor states this is fixed in 5.15.148 (unaffected)