Answer in brief
CVE-2023-53487 records a High severity (CVSS 7.8) vulnerability in powerpc/rtas_flash: allow user copy to flash block cache objects. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Product | Affected versions | Fixed versions |
|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:6.5:rc1:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:6.5:rc2:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:6.5:rc3:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:6.5:rc4:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:6.5:rc5:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:6.5:rc6:*:*:*:*:*:* | Not reported | Not reported |
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=6d07d1cd300f4c7e16005f881fea388164999cc8 <8f09cc15dcd91d16562400c51d24c7be0d5796fa || >=6d07d1cd300f4c7e16005f881fea388164999cc8 <1d29e21ed09fa668416fa7721e08d451b9903485 || >=6d07d1cd300f4c7e16005f881fea388164999cc8 <0ba7f969be599e21d4b1f1e947593de6515f4996 || >=6d07d1cd300f4c7e16005f881fea388164999cc8 <8ef25fb13494e35c6dbe15445c7875fa92bc3e8b || >=6d07d1cd300f4c7e16005f881fea388164999cc8 <b8fee83aa4ed3846c7f50a0b364bc699f48d96e5 || >=6d07d1cd300f4c7e16005f881fea388164999cc8 <6acb8a453388374fafb3c3b37534b675b2aa0ae1 || >=6d07d1cd300f4c7e16005f881fea388164999cc8 <4f3175979e62de3b929bfa54a0db4b87d36257a7 | 8f09cc15dcd91d16562400c51d24c7be0d5796fa, 1d29e21ed09fa668416fa7721e08d451b9903485, 0ba7f969be599e21d4b1f1e947593de6515f4996, 8ef25fb13494e35c6dbe15445c7875fa92bc3e8b, b8fee83aa4ed3846c7f50a0b364bc699f48d96e5, 6acb8a453388374fafb3c3b37534b675b2aa0ae1, 4f3175979e62de3b929bfa54a0db4b87d36257a7 |
| Linux/Linuxgeneric | 4.16 | Not reported |
Published upstream
Oct 1, 2025
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Nov 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Nov 5, 2026
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]
Quoted source text, attributed separately from HOL analysis.