CVE-2022-50765
- Published: 2025-12-24T13:16:03.297
In the Linux kernel, the following vulnerability has been resolved:
RISC-V: kexec: Fix memory leak of elf header buffer
This is reported by kmemleak detector:
unreferenced object 0xff2000000403d000 (size 4096):
comm “kexec”, pid 146, jiffies 4294900633 (age 64.792s)
hex dump (first 32 bytes):
7f 45 4c 46 02 01 01 00 00 00 00 00 00 00 00 00 .ELF…………
04 00 f3 00 01 00 00 00 00 00 00 00 00 00 00 00 …………….
backtrace:
[] kmemleak_vmalloc+0x3c/0xbe
[] __vmalloc_node_range+0x3ac/0x560
[] __vmalloc_node+0x56/0x62
[] vzalloc+0x2c/0x34
[] crash_prepare_elf64_headers+0x80/0x30c
[] elf_kexec_load+0x3e8/0x4ec
[] kexec_image_load_default+0x40/0x4c
[] sys_kexec_file_load+0x1c4/0x322
[] ret_from_syscall+0x0/0x2
In elf_kexec_load(), a buffer is allocated via vzalloc() to store elf
headers. While it’s not freed back to system when kdump kernel is
reloaded or unloaded, or when image->elf_header is successfully set and
then fails to load kdump kernel for some reason. Fix it by freeing the
buffer in arch_kimage_file_post_load_cleanup().
Related CVE by CWE
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How to fix CVE-2022-50765
Description: In the Linux kernel, the following vulnerability has been resolved: RISC-V: kexec: Fix memory leak of elf header buffer This is reported by kmemleak detector: unreferenced object 0xff2000000403d000 (size 4096): comm “kexec”, pid 146, jiffies 4294900633 (age 64.792s) hex dump (first 32 bytes): 7f 45 4c 46 02 01 01 00 00 00 00 00 […]
Exploit Difficulty: HARD
⏱️ Time to exploit: > 4 hours
🛠️ Required skills: Advanced security expertise
💰 Public exploits: Rare or not public
How to Fix:
- Check if you're running the affected product
- Update to the latest patched version
- If patching is not immediately possible: restrict network exposure, apply least-privilege access
- Test the fix in a staging environment first
- Review logs for signs of exploitation
- Monitor for IOCs (Indicators of Compromise)
- Enable automatic security updates
- Set up vulnerability monitoring
- Review and harden security configurations
Exploit Difficulty Assessment
Vulnerability Timeline
CVE details first published to NVD database
Added to this CVE tracking system
Detection Rules & IOCs
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No vendor/product data available.