CVE-2023-53487 Details
Description
In the Linux kernel, the following vulnerability has been resolved: powerpc/rtas_flash: allow user copy to flash block cache objects With hardened usercopy enabled (CONFIG_HARDENED_USERCOPY=y), using the /proc/powerpc/rtas/firmware_update interface to prepare a system firmware update yields a BUG(): kernel BUG at mm/usercopy.c:102! Oops: Exception in kernel mode, sig: 5 [#1] LE PAGE_SIZE=64K MMU=Hash SMP NR_CPUS=2048 NUMA pSeries Modules linked in: CPU: 0 PID: 2232 Comm: dd Not tainted 6.5.0-rc3+ #2 Hardware name: IBM,8408-E8E POWER8E (raw) 0x4b0201 0xf000004 of:IBM,FW860.50 (SV860_146) hv:phyp pSeries NIP: c0000000005991d0 LR: c0000000005991cc CTR: 0000000000000000 REGS: c0000000148c76a0 TRAP: 0700 Not tainted (6.5.0-rc3+) MSR: 8000000000029033 <SF,EE,ME,IR,DR,RI,LE> CR: 24002242 XER: 0000000c CFAR: c0000000001fbd34 IRQMASK: 0 [ ... GPRs omitted ... ] NIP usercopy_abort+0xa0/0xb0 LR usercopy_abort+0x9c/0xb0 Call Trace: usercopy_abort+0x9c/0xb0 (unreliable) __check_heap_object+0x1b4/0x1d0 __check_object_size+0x2d0/0x380 rtas_flash_write+0xe4/0x250 proc_reg_write+0xfc/0x160 vfs_write+0xfc/0x4e0 ksys_write+0x90/0x160 system_call_exception+0x178/0x320 system_call_common+0x160/0x2c4 The blocks of the firmware image are copied directly from user memory to objects allocated from flash_block_cache, so flash_block_cache must be created using kmem_cache_create_usercopy() to mark it safe for user access. [mpe: Trim and indent oops]
A vulnerability in the Linux kernel's PowerPC RTAS flash handling has been addressed. With hardened user copy enabled, using the RTAS firmware update interface to prepare a system firmware update can trigger a kernel bug. This occurs because the firmware update process attempts to copy data from user memory into objects allocated from the flash block cache, without proper safeguards for user access. The issue has been fixed by ensuring that the flash block cache is created in a way that allows safe user memory access.
The vulnerability has been fixed in the Linux kernel. Users should upgrade to the latest version where this issue has been addressed.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
No SSVC data is available for this CVE.
References to Advisories, Solutions, and Tools
By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.
| URL | Source(s) | Tag(s) |
|---|---|---|
| https://git.kernel.org/stable/c/0ba7f969be599e21d4b1f1e947593de6515f4996 | kernel.org | Patch |
| https://git.kernel.org/stable/c/1d29e21ed09fa668416fa7721e08d451b9903485 | kernel.org | Patch |
| https://git.kernel.org/stable/c/4f3175979e62de3b929bfa54a0db4b87d36257a7 | kernel.org | Patch |
| https://git.kernel.org/stable/c/6acb8a453388374fafb3c3b37534b675b2aa0ae1 | kernel.org | Patch |
| https://git.kernel.org/stable/c/8ef25fb13494e35c6dbe15445c7875fa92bc3e8b | kernel.org | Patch |
| https://git.kernel.org/stable/c/8f09cc15dcd91d16562400c51d24c7be0d5796fa | kernel.org | Patch |
| https://git.kernel.org/stable/c/b8fee83aa4ed3846c7f50a0b364bc699f48d96e5 | kernel.org | Patch |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| NVD-CWE-noinfo | Insufficient Information to Classify Weakness | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| linux linux kernel | >= 4.16, < 4.19.293 >= 4.20, < 5.4.255 >= 5.5, < 5.10.192 >= 5.11, < 5.15.128 >= 5.16, < 6.1.47 >= 6.2, < 6.4.12 6.5 rc1 6.5 rc2 6.5 rc3 6.5 rc4 6.5 rc5 6.5 rc6 |
CPE
Remediation
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Change History
3 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | kernel.org |
| Jan 20, 2026 | Initial Analysis | [email protected] |
| Oct 1, 2025 | New CVE Received | kernel.org |