CVE-2026-43289

kexec: derive purgatory entry from symbol

MEDIUM

5.5

CVSS Score

Published: May 8, 2026 at 01:11 PM UTC

Updated: June 17, 2026 at 10:49 AM UTC

1 product affected across 1 vendorLinux Kernel

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Severity

MEDIUM5.5

Exploit prediction

EPSS 0.1%

Description

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 [[email protected]: move helper to avoid forward declaration, per Baoquan]

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Linux Kernel · Linux

95%

v ≥ 4.19.287v ≥ 5.4.248v ≥ 6.3.94.19.287 ≤ v < 4.205.10.185 ≤ v < 5.10.2525.15.118 ≤ v < 5.15.2025.4.248 ≤ v < 5.56.1.35 ≤ v < 6.1.1656.13 ≤ v < 6.18.166.19 ≤ v < 6.19.66.3.9 ≤ v < 6.46.4 ≤ v < 6.12.756.4 ≤ v < 6.18.166.4 ≤ v < 6.19.66.4 ≤ v < 6.6.1286.4 ≤ v < 7.06.4.1 ≤ v < 6.6.1286.7 ≤ v < 6.12.7513027918a4efa807409fcb356009c117e4d181a4.19.2874947a0eb7d642b6048559857964966016ef3aa8b5.10.185 5.15.118 5.4.248 6.1.35 6.3.9 6.4 6.4 rc7 7.0 rc1 7.0 rc2 7.0 rc3 7.0 rc4 7.0 rc5 7.0 rc6 7.0 rc78652d44f466ad5772e7d1756e9457046189b0dfcb16bf76b382810257e3fb6278663a9d131b70197cb1638618545182a01444b2b20a4ed6b9d2a8c8fd38e051ec6fd8650b139d9bc4b0b8b261953b263f368aed4827bd4276c0e3664fb2cb815a8d7caf3

Vendor states this is fixed in 027797595a108726f4a0a45d225f603b0ffbd22b (fixed)

Vendor states this is fixed in 1737d37ae1d2814e6cf0a1af87af3d41f0812b95 (fixed)

Vendor states this is fixed in 36eb314184a0ae74dd42914b47d2b9fc43be8034 (fixed)

Vendor states this is fixed in 480e1d5c64bb14441f79f2eb9421d5e26f91ea3d (fixed)

Vendor states this is fixed in 5226570bd252cea2e805a161cb0f75c204c3108a (fixed)

Vendor states this is fixed in 875355152b33436907c2a6d2ffad1431fa86c62b (fixed)

Vendor states this is fixed in cfccd3b8c51bc57a8a6fcb2fd30453afae5bc0d2 (fixed)

Vendor states this is fixed in f736032c638a33a243e9126e617788f763d648f9 (fixed)

Affected range stops below 4.20, so it looks safe — our inference, not a vendor statement

Vendor states this is fixed in 5.10.252 (unaffected)

Vendor states this is fixed in 5.15.202 (unaffected)

Affected range stops below 5.5, so it looks safe — our inference, not a vendor statement