CVE-2026-43289

Summary

In the Linux kernel, the following vulnerability has been resolved: kexec: derive purgatory entry from symbol kexec_load_purgatory() derives image->start by locating e_entry inside an SHF_EXECINSTR

Details

In the Linux kernel, the following vulnerability has been resolved: kexec: derive purgatory entry from symbol kexec_load_purgatory() derives image->start by locating e_entry inside an SHF_EXECINSTR section. If the purgatory object contains multiple executable sections with overlapping sh_addr, the entrypoint check can match more than once and trigger a WARN. Derive the entry section from the purgatory_start symbol when present and compute image->start from its final placement. Keep the existing e_entry fallback for purgatories that do not expose the symbol. WARNING: kernel/kexec_file.c:1009 at kexec_load_purgatory+0x395/0x3c0, CPU#10: kexec/1784 Call Trace: <TASK> bzImage64_load+0x133/0xa00 __do_sys_kexec_file_load+0x2b3/0x5c0 do_syscall_64+0x81/0x610 entry_SYSCALL_64_after_hwframe+0x76/0x7e [me@linux.beauty: move helper to avoid forward declaration, per Baoquan]

References

• https://git.kernel.org/stable/c/027797595a108726f4a0a45d225f603b0ffbd22b
• https://git.kernel.org/stable/c/1737d37ae1d2814e6cf0a1af87af3d41f0812b95
• https://git.kernel.org/stable/c/36eb314184a0ae74dd42914b47d2b9fc43be8034
• https://git.kernel.org/stable/c/480e1d5c64bb14441f79f2eb9421d5e26f91ea3d
• https://git.kernel.org/stable/c/5226570bd252cea2e805a161cb0f75c204c3108a
• https://git.kernel.org/stable/c/875355152b33436907c2a6d2ffad1431fa86c62b
• https://git.kernel.org/stable/c/cfccd3b8c51bc57a8a6fcb2fd30453afae5bc0d2
• https://git.kernel.org/stable/c/f736032c638a33a243e9126e617788f763d648f9