Answer in brief
CVE-2026-31426 records a High severity (CVSS 7.0) vulnerability in ACPI: EC: clean up handlers on probe failure in acpi_ec_setup(). The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.0. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=03e9a0e05739cf872fee494b06c75c0469704a21 <022d1727f33ff90b3e1775125264e3023901952e || >=03e9a0e05739cf872fee494b06c75c0469704a21 <9c886e63b69658959633937e3acb7ca8addf7499 || >=03e9a0e05739cf872fee494b06c75c0469704a21 <808c0f156f48d5b8ca34088cbbfba8444e606cbc || >=03e9a0e05739cf872fee494b06c75c0469704a21 <d04c007047c88158141d9bd5eac761cdadd3782c || >=03e9a0e05739cf872fee494b06c75c0469704a21 <be1a827e15991e874e0d5222d0ea5fdad01960fe || >=03e9a0e05739cf872fee494b06c75c0469704a21 <f6484cadbcaf26b5844b51bd7307a663dda48ef6 | 022d1727f33ff90b3e1775125264e3023901952e, 9c886e63b69658959633937e3acb7ca8addf7499, 808c0f156f48d5b8ca34088cbbfba8444e606cbc, d04c007047c88158141d9bd5eac761cdadd3782c, be1a827e15991e874e0d5222d0ea5fdad01960fe, f6484cadbcaf26b5844b51bd7307a663dda48ef6 |
| Linux/Linuxgeneric | 5.7 | Not reported |
Published upstream
Apr 13, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 16, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Oct 16, 2026
In the Linux kernel, the following vulnerability has been resolved: ACPI: EC: clean up handlers on probe failure in acpi_ec_setup() When ec_install_handlers() returns -EPROBE_DEFER on reduced-hardware platforms, it has already started the EC and installed the address space handler with the struct acpi_ec pointer as handler context. However, acpi_ec_setup() propagates the error without any cleanup. The caller acpi_ec_add() then frees the struct acpi_ec for non-boot instances, leaving a dangling handler context in ACPICA. Any subsequent AML evaluation that accesses an EC OpRegion field dispatches into acpi_ec_space_handler() with the freed pointer, causing a use-after-free: BUG: KASAN: slab-use-after-free in mutex_lock (kernel/locking/mutex.c:289) Write of size 8 at addr ffff88800721de38 by task init/1 Call Trace: <TASK> mutex_lock (kernel/locking/mutex.c:289) acpi_ec_space_handler (drivers/acpi/ec.c:1362) acpi_ev_address_space_dispatch (drivers/acpi/acpica/evregion.c:293) acpi_ex_access_region (drivers/acpi/acpica/exfldio.c:246) acpi_ex_field_datum_io (drivers/acpi/acpica/exfldio.c:509) acpi_ex_extract_from_field (drivers/acpi/acpica/exfldio.c:700) acpi_ex_read_data_from_field (drivers/acpi/acpica/exfield.c:327) acpi_ex_resolve_node_to_value (drivers/acpi/acpica/exresolv.c:392) </TASK> Allocated by task 1: acpi_ec_alloc (drivers/acpi/ec.c:1424) acpi_ec_add (drivers/acpi/ec.c:1692) Freed by task 1: kfree (mm/slub.c:6876) acpi_ec_add (drivers/acpi/ec.c:1751) The bug triggers on reduced-hardware EC platforms (ec->gpe < 0) when the GPIO IRQ provider defers probing. Once the stale handler exists, any unprivileged sysfs read that causes AML to touch an EC OpRegion (battery, thermal, backlight) exercises the dangling pointer. Fix this by calling ec_remove_handlers() in the error path of acpi_ec_setup() before clearing first_ec. ec_remove_handlers() checks each EC_FLAGS_* bit before acting, so it is safe to call regardless of how far ec_install_handlers() progressed: -ENODEV (handler not installed): only calls acpi_ec_stop() -EPROBE_DEFER (handler installed): removes handler, stops EC
Quoted source text, attributed separately from HOL analysis.