CVE-2026-43289 PUBLISHED

kexec: derive purgatory entry from symbol

Assigner: Linux
Reserved: 01.05.2026 Published: 08.05.2026 Updated: 08.05.2026

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]

Product Status

Vendor Linux
Product Linux
Versions Default: unaffected
  • affected from f368aed4827bd4276c0e3664fb2cb815a8d7caf3 to 027797595a108726f4a0a45d225f603b0ffbd22b (excl.)
  • affected from d38e051ec6fd8650b139d9bc4b0b8b261953b263 to 1737d37ae1d2814e6cf0a1af87af3d41f0812b95 (excl.)
  • affected from 013027918a4efa807409fcb356009c117e4d181a to f736032c638a33a243e9126e617788f763d648f9 (excl.)
  • affected from 8652d44f466ad5772e7d1756e9457046189b0dfc to cfccd3b8c51bc57a8a6fcb2fd30453afae5bc0d2 (excl.)
  • affected from 8652d44f466ad5772e7d1756e9457046189b0dfc to 875355152b33436907c2a6d2ffad1431fa86c62b (excl.)
  • affected from 8652d44f466ad5772e7d1756e9457046189b0dfc to 36eb314184a0ae74dd42914b47d2b9fc43be8034 (excl.)
  • affected from 8652d44f466ad5772e7d1756e9457046189b0dfc to 5226570bd252cea2e805a161cb0f75c204c3108a (excl.)
  • affected from 8652d44f466ad5772e7d1756e9457046189b0dfc to 480e1d5c64bb14441f79f2eb9421d5e26f91ea3d (excl.)
  • Version 4947a0eb7d642b6048559857964966016ef3aa8b is affected
  • Version b16bf76b382810257e3fb6278663a9d131b70197 is affected
  • Version cb1638618545182a01444b2b20a4ed6b9d2a8c8f is affected
Vendor Linux
Product Linux
Versions Default: affected
  • Version 6.4 is affected
  • unaffected from 0 to 6.4 (excl.)
  • unaffected from 5.10.252 to 5.10.* (incl.)
  • unaffected from 5.15.202 to 5.15.* (incl.)
  • unaffected from 6.1.165 to 6.1.* (incl.)
  • unaffected from 6.6.128 to 6.6.* (incl.)
  • unaffected from 6.12.75 to 6.12.* (incl.)
  • unaffected from 6.18.16 to 6.18.* (incl.)
  • unaffected from 6.19.6 to 6.19.* (incl.)
  • unaffected from 7.0 to * (incl.)

References