cbcvebase.
CVE-2022-49546
published 2025-02-26

CVE-2022-49546: In the Linux kernel, the following vulnerability has been resolved: x86/kexec: fix memory leak of elf header buffer This is reported by kmemleak detector…

PriorityP420medium5.5CVSS 3.1
AVLACLPRLUINSUCNINAH
EPSS
0.28%
20.0th percentile
In the Linux kernel, the following vulnerability has been resolved: x86/kexec: fix memory leak of elf header buffer This is reported by kmemleak detector: unreferenced object 0xffffc900002a9000 (size 4096): comm "kexec", pid 14950, jiffies 4295110793 (age 373.951s) hex dump (first 32 bytes): 7f 45 4c 46 02 01 01 00 00 00 00 00 00 00 00 00 .ELF............ 04 00 3e 00 01 00 00 00 00 00 00 00 00 00 00 00 ..>............. backtrace: [] __vmalloc_node_range+0x101/0x170 [] __vmalloc_node+0xb4/0x160 [] crash_prepare_elf64_headers+0x8e/0xcd0 [] crash_load_segments+0x260/0x470 [] bzImage64_load+0x814/0xad0 [] arch_kexec_kernel_image_load+0x1be/0x2a0 [] kimage_file_alloc_init+0x2ec/0x5a0 [] __do_sys_kexec_file_load+0x28d/0x530 [] do_syscall_64+0x3b/0x90 [] entry_SYSCALL_64_after_hwframe+0x44/0xae In crash_prepare_elf64_headers(), a buffer is allocated via vmalloc() to store elf headers. While it's not freed back to system correctly when kdump kernel is reloaded or unloaded. Then memory leak is caused. Fix it by introducing x86 specific function arch_kimage_file_post_load_cleanup(), and freeing the buffer there. And also remove the incorrect elf header buffer freeing code. Before calling arch specific kexec_file loading function, the image instance has been initialized. So 'image->elf_headers' must be NULL. It doesn't make sense to free the elf header buffer in the place. Three different people have reported three bugs about the memory leak on x86_64 inside Redhat.

Affected

14 ranges
VendorProductVersion rangeFixed in
debianlinux< linux 5.18.5-1 (bookworm)linux 5.18.5-1 (bookworm)
linuxlinux——
linuxlinux>= dd5f726076cc7639d9713b334c8c133f77c6757a < 23cf39dccf7653650701a6f39b119e9116a27f1a23cf39dccf7653650701a6f39b119e9116a27f1a
linuxlinux>= dd5f726076cc7639d9713b334c8c133f77c6757a < 8765a423a87d74ef24ea02b43b2728fe4039f2488765a423a87d74ef24ea02b43b2728fe4039f248
linuxlinux>= dd5f726076cc7639d9713b334c8c133f77c6757a < 115ee42a4c2f26ba2b4ace2668a3f004621f6833115ee42a4c2f26ba2b4ace2668a3f004621f6833
linuxlinux>= dd5f726076cc7639d9713b334c8c133f77c6757a < f675e3a9189d84a9324ab45b0cb19906c2bc8fcbf675e3a9189d84a9324ab45b0cb19906c2bc8fcb
linuxlinux>= dd5f726076cc7639d9713b334c8c133f77c6757a < b3e34a47f98974d0844444c5121aaff123004e57b3e34a47f98974d0844444c5121aaff123004e57
linuxlinux_kernel< 5.15.465.15.46
linuxlinux_kernel>= 0 < 5.10.237-15.10.237-1
linuxlinux_kernel>= 0 < 5.18.5-15.18.5-1
linuxlinux_kernel>= 0 < 5.18.5-15.18.5-1
linuxlinux_kernel>= 0 < 5.18.5-15.18.5-1
linuxlinux_kernel>= 5.16 < 5.17.145.17.14
linuxlinux_kernel>= 5.18 < 5.18.35.18.3

CVSS provenance

nvdv3.15.5MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
osv5.5MEDIUM
vendor_debian5.5MEDIUM
vendor_redhat5.5MEDIUM
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