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7.8

Linux kernel on GCP/GKE may free device during timer cleanup

CVE-2026-46213 · published 5 months ago
Summary

The Linux kernel versions used in Canonical's GCP and GKE images have a bug where a background timer can still try to operate on a device that has already been released, which can lead to system instability or crashes. The issue is fixed in updated kernel releases. Apply the latest kernel updates for the affected Canonical images as soon as possible.

What to do
  • Update debian linux to version 7.0.9-1.
  • Update canonical linux-hwe-7.0 to version 7.0.0-28.28~24.04.1.
  • Update canonical linux-nvidia-7.0 to version 7.0.0-1016.16~24.04.1.
  • Update canonical linux-riscv-7.0 to version 7.0.0-28.28.1~24.04.3.
  • Update canonical linux to version 7.0.0-28.28.
  • Update canonical linux-aws to version 7.0.0-1009.9.
  • Update canonical linux-azure to version 7.0.0-1010.10.
  • Update canonical linux-azure-fde to version 7.0.0-1009.9.
  • Update canonical linux-gcp to version 7.0.0-1008.8.
  • Update canonical linux-gke to version 7.0.0-1003.4.
  • Update canonical linux-ibm to version 7.0.0-1010.10.
  • Update canonical linux-nvidia to version 7.0.0-1016.16.
  • Update canonical linux-nvidia-bos to version 7.0.0-2016.16.
  • Update canonical linux-oem-7.0 to version 7.0.0-1009.9.
  • Update canonical linux-oracle to version 7.0.0-1008.8.
  • Update canonical linux-raspi to version 7.0.0-1015.15.
  • Update canonical linux-realtime to version 7.0.0-28.28.1.
  • Update canonical linux-riscv to version 7.0.0-28.28.1.
  • Update canonical linux-azure-7.0 to version 7.0.0-1014.14~24.04.1.
  • Update canonical linux-gcp-7.0 to version 7.0.0-1011.11~24.04.1.
  • Update canonical linux-oracle-7.0 to version 7.0.0-1011.11~24.04.1.
  • Update linux kernel to version 7.0.9.
Affected software
Ecosystem VendorProductAffected versions
Ubuntu:20.04:LTS canonical linux-gcp-5.13 All versions
Ubuntu:20.04:LTS canonical linux-gcp-5.8 All versions
Ubuntu:20.04:LTS canonical linux-gke All versions
Ubuntu:20.04:LTS canonical linux-gke-5.15 All versions
Ubuntu:20.04:LTS canonical linux-gkeop All versions
Ubuntu:20.04:LTS canonical linux-gkeop-5.15 All versions
Ubuntu:20.04:LTS canonical linux-hwe-5.11 All versions
Ubuntu:20.04:LTS canonical linux-hwe-5.13 All versions
Ubuntu:20.04:LTS canonical linux-hwe-5.8 All versions
Ubuntu:20.04:LTS canonical linux-intel-5.13 All versions
Ubuntu:20.04:LTS canonical linux-oem-5.10 All versions
Ubuntu:20.04:LTS canonical linux-oem-5.13 All versions
Ubuntu:20.04:LTS canonical linux-oem-5.14 All versions
Ubuntu:20.04:LTS canonical linux-oem-5.6 All versions
Ubuntu:20.04:LTS canonical linux-oracle-5.11 All versions
Ubuntu:20.04:LTS canonical linux-oracle-5.13 All versions
Ubuntu:20.04:LTS canonical linux-oracle-5.8 All versions
Ubuntu:20.04:LTS canonical linux-raspi2 All versions
Ubuntu:20.04:LTS canonical linux-riscv All versions
Ubuntu:20.04:LTS canonical linux-riscv-5.11 All versions
Ubuntu:20.04:LTS canonical linux-riscv-5.8 All versions
Ubuntu:22.04:LTS canonical linux-allwinner-5.19 All versions
Ubuntu:22.04:LTS canonical linux-aws-5.19 All versions
Ubuntu:22.04:LTS canonical linux-aws-6.2 All versions
Ubuntu:22.04:LTS canonical linux-aws-6.5 All versions
Ubuntu:22.04:LTS canonical linux-azure-5.19 All versions
Ubuntu:22.04:LTS canonical linux-azure-6.2 All versions
Ubuntu:22.04:LTS canonical linux-azure-6.5 All versions
Ubuntu:22.04:LTS canonical linux-azure-fde-5.19 All versions
Ubuntu:22.04:LTS canonical linux-azure-fde-6.2 All versions
Ubuntu:22.04:LTS canonical linux-gcp-5.19 All versions
Ubuntu:22.04:LTS canonical linux-gcp-6.2 All versions
Ubuntu:22.04:LTS canonical linux-gcp-6.5 All versions
Ubuntu:22.04:LTS canonical linux-hwe-5.19 All versions
Ubuntu:22.04:LTS canonical linux-hwe-6.2 All versions
Ubuntu:22.04:LTS canonical linux-hwe-6.5 All versions
Ubuntu:22.04:LTS canonical linux-intel-iot-realtime All versions
Ubuntu:22.04:LTS canonical linux-lowlatency-hwe-5.19 All versions
Ubuntu:22.04:LTS canonical linux-lowlatency-hwe-6.2 All versions
Ubuntu:22.04:LTS canonical linux-lowlatency-hwe-6.5 All versions
Ubuntu:22.04:LTS canonical linux-nvidia-6.2 All versions
Ubuntu:22.04:LTS canonical linux-nvidia-6.5 All versions
Ubuntu:22.04:LTS canonical linux-oem-5.17 All versions
Ubuntu:22.04:LTS canonical linux-oem-6.0 All versions
Ubuntu:22.04:LTS canonical linux-oem-6.1 All versions
Ubuntu:22.04:LTS canonical linux-oem-6.5 All versions
Ubuntu:22.04:LTS canonical linux-oracle-6.5 All versions
Ubuntu:22.04:LTS canonical linux-realtime All versions
Ubuntu:22.04:LTS canonical linux-riscv All versions
Ubuntu:22.04:LTS canonical linux-riscv-5.19 All versions
Showing 50 of 139. Show the rest
Ecosystem VendorProductAffected versions
Ubuntu:22.04:LTS canonical linux-riscv-6.5 All versions
Ubuntu:22.04:LTS canonical linux-starfive-5.19 All versions
Ubuntu:22.04:LTS canonical linux-starfive-6.2 All versions
Ubuntu:22.04:LTS canonical linux-starfive-6.5 All versions
Ubuntu:24.04:LTS canonical linux-aws-6.14 All versions
Ubuntu:24.04:LTS canonical linux-aws-6.17 All versions
Ubuntu:24.04:LTS canonical linux-azure-6.11 All versions
Ubuntu:24.04:LTS canonical linux-oem-6.11 All versions
Ubuntu:24.04:LTS canonical linux-oem-6.14 All versions
Ubuntu:24.04:LTS canonical linux-oem-6.17 All versions
Ubuntu:24.04:LTS canonical linux-oem-6.8 All versions
Ubuntu:24.04:LTS canonical linux-oracle-6.14 All versions
Ubuntu:24.04:LTS canonical linux-oracle-6.17 All versions
Ubuntu:24.04:LTS canonical linux-raspi-realtime All versions
Ubuntu:24.04:LTS canonical linux-realtime All versions
Ubuntu:24.04:LTS canonical linux-riscv All versions
Ubuntu:24.04:LTS canonical linux-riscv-6.14 All versions
Ubuntu:24.04:LTS canonical linux-riscv-6.17 All versions
Ubuntu:Nvidia-BlueField:24.04:LTS canonical linux-bluefield All versions
Ubuntu:Pro:Realtime:24.04:LTS canonical linux-realtime-6.14 All versions
Ubuntu:Pro:Realtime:24.04:LTS canonical linux-realtime-6.17 All versions
Ubuntu:25.10 canonical linux All versions
Ubuntu:25.10 canonical linux-aws All versions
Ubuntu:25.10 canonical linux-azure All versions
Ubuntu:25.10 canonical linux-azure-fde All versions
Ubuntu:25.10 canonical linux-gcp All versions
Ubuntu:25.10 canonical linux-oracle All versions
Ubuntu:25.10 canonical linux-raspi All versions
Ubuntu:25.10 canonical linux-realtime All versions
Ubuntu:25.10 canonical linux-riscv All versions
Ubuntu:26.04:LTS canonical linux < 7.0.0-28.28
Fix: upgrade to 7.0.0-28.28
Ubuntu:26.04:LTS canonical linux-aws < 7.0.0-1009.9
Fix: upgrade to 7.0.0-1009.9
Ubuntu:26.04:LTS canonical linux-azure < 7.0.0-1010.10
Fix: upgrade to 7.0.0-1010.10
Ubuntu:26.04:LTS canonical linux-azure-fde < 7.0.0-1009.9
Fix: upgrade to 7.0.0-1009.9
Ubuntu:26.04:LTS canonical linux-gcp < 7.0.0-1008.8
Fix: upgrade to 7.0.0-1008.8
Ubuntu:26.04:LTS canonical linux-ibm < 7.0.0-1010.10
Fix: upgrade to 7.0.0-1010.10
Ubuntu:26.04:LTS canonical linux-nvidia < 7.0.0-1016.16
Fix: upgrade to 7.0.0-1016.16
Ubuntu:26.04:LTS canonical linux-oracle < 7.0.0-1008.8
Fix: upgrade to 7.0.0-1008.8
Ubuntu:26.04:LTS canonical linux-raspi < 7.0.0-1015.15
Fix: upgrade to 7.0.0-1015.15
Ubuntu:26.04:LTS canonical linux-realtime < 7.0.0-28.28.1
Fix: upgrade to 7.0.0-28.28.1
Ubuntu:26.04:LTS canonical linux-riscv < 7.0.0-28.28.1
Fix: upgrade to 7.0.0-28.28.1
Debian:14 debian linux < 7.0.9-1
Fix: upgrade to 7.0.9-1
– linux linux_kernel >= 6.15.6, < 6.16
>= 6.16.1, < 6.18.32
>= 6.19, < 7.0.9
6.16
7.1
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
Ubuntu:16.04:LTS canonical linux-hwe-edge All versions
Ubuntu:18.04:LTS canonical linux-aws-5.0 All versions
Ubuntu:18.04:LTS canonical linux-aws-5.3 All versions
Ubuntu:18.04:LTS canonical linux-azure All versions
Ubuntu:18.04:LTS canonical linux-azure-5.3 All versions
Ubuntu:18.04:LTS canonical linux-azure-edge All versions
Ubuntu:18.04:LTS canonical linux-gcp All versions
Ubuntu:18.04:LTS canonical linux-gcp-5.3 All versions
Ubuntu:18.04:LTS canonical linux-gke-4.15 All versions
Ubuntu:18.04:LTS canonical linux-gke-5.4 All versions
Ubuntu:18.04:LTS canonical linux-gkeop-5.4 All versions
Ubuntu:18.04:LTS canonical linux-hwe All versions
Ubuntu:18.04:LTS canonical linux-hwe-edge All versions
Ubuntu:18.04:LTS canonical linux-oem All versions
Ubuntu:18.04:LTS canonical linux-oracle-5.0 All versions
Ubuntu:18.04:LTS canonical linux-oracle-5.3 All versions
Ubuntu:20.04:LTS canonical linux-aws-5.11 All versions
Ubuntu:20.04:LTS canonical linux-aws-5.13 All versions
Ubuntu:20.04:LTS canonical linux-aws-5.8 All versions
Ubuntu:20.04:LTS canonical linux-azure-5.11 All versions
Ubuntu:20.04:LTS canonical linux-azure-5.13 All versions
Ubuntu:20.04:LTS canonical linux-azure-5.8 All versions
Ubuntu:20.04:LTS canonical linux-azure-fde All versions
Ubuntu:20.04:LTS canonical linux-gcp-5.11 All versions
Ubuntu:24.04:LTS canonical linux-azure-6.17 All versions
Ubuntu:24.04:LTS canonical linux-azure-fde-6.17 All versions
Ubuntu:24.04:LTS canonical linux-gcp-6.11 All versions
Ubuntu:24.04:LTS canonical linux-gcp-6.14 All versions
Ubuntu:24.04:LTS canonical linux-gcp-6.17 All versions
Ubuntu:24.04:LTS canonical linux-hwe-6.11 All versions
Ubuntu:24.04:LTS canonical linux-hwe-6.14 All versions
Ubuntu:24.04:LTS canonical linux-hwe-6.17 All versions
Ubuntu:24.04:LTS canonical linux-lowlatency-hwe-6.11 All versions
Ubuntu:24.04:LTS canonical linux-nvidia-6.11 All versions
Ubuntu:24.04:LTS canonical linux-nvidia-6.17 All versions
Ubuntu:24.04:LTS canonical linux-azure-7.0 < 7.0.0-1014.14~24.04.1
Fix: upgrade to 7.0.0-1014.14~24.04.1
Ubuntu:24.04:LTS canonical linux-gcp-7.0 < 7.0.0-1011.11~24.04.1
Fix: upgrade to 7.0.0-1011.11~24.04.1
Ubuntu:24.04:LTS canonical linux-hwe-7.0 < 7.0.0-28.28~24.04.1
Fix: upgrade to 7.0.0-28.28~24.04.1
Ubuntu:24.04:LTS canonical linux-nvidia-7.0 < 7.0.0-1016.16~24.04.1
Fix: upgrade to 7.0.0-1016.16~24.04.1
Ubuntu:24.04:LTS canonical linux-oracle-7.0 < 7.0.0-1011.11~24.04.1
Fix: upgrade to 7.0.0-1011.11~24.04.1
Ubuntu:24.04:LTS canonical linux-riscv-7.0 < 7.0.0-28.28.1~24.04.3
Fix: upgrade to 7.0.0-28.28.1~24.04.3
Ubuntu:26.04:LTS canonical linux-gke < 7.0.0-1003.4
Fix: upgrade to 7.0.0-1003.4
Ubuntu:26.04:LTS canonical linux-nvidia-bos < 7.0.0-2016.16
Fix: upgrade to 7.0.0-2016.16
Ubuntu:26.04:LTS canonical linux-oem-7.0 < 7.0.0-1009.9
Fix: upgrade to 7.0.0-1009.9
Ubuntu:24.04:LTS canonical linux-azure-fde-7.0 All versions
Linux linux kernel >= 6.19.0, < 7.0.9
Fix: upgrade to 7.0.9
Original advisory text
HID: appletb-kbd: fix UAF in inactivity-timer cleanup path
In the Linux kernel, the following vulnerability has been resolved: HID: appletb-kbd: fix UAF in inactivity-timer cleanup path Commit 38224c472a03 ("HID: appletb-kbd: fix slab use-after-free bug in appletb_kbd_probe") added timer_delete_sync(&kbd->inactivity_timer) to both the probe close_hw error path and appletb_kbd_remove(), but the way it was wired in left the inactivity timer reachable during driver tear-down via two distinct windows. Window A -- put_device() before timer_delete_sync(): put_device(&kbd->backlight_dev->dev); timer_delete_sync(&kbd->inactivity_timer); The inactivity_timer softirq reads kbd->backlight_dev and calls backlight_device_set_brightness() -> mutex_lock(&ops_lock). If a concurrent hid_appletb_bl unbind drops the last devm reference between these two calls, the backlight_device is freed and the mutex_lock() touches freed memory. Window B -- backlight cleanup before hid_hw_stop(): if (kbd->backlight_dev) { timer_delete_sync(...); put_device(...); } hid_hw_close(hdev); hid_hw_stop(hdev); Even after Window A is closed, hid_hw_close()/hid_hw_stop() still run afterwards, so a late ".event" callback from the HID core (USB URB completion on real Apple hardware) can arrive after timer_delete_sync() drained the softirq but before put_device() drops the reference. That callback reaches reset_inactivity_timer(), which calls mod_timer() and re-arms the timer. The freshly re-armed timer can then fire on the about-to-be-freed backlight_device. Both windows produce the same KASAN slab-use-after-free: BUG: KASAN: slab-use-after-free in __mutex_lock+0x1aab/0x21c0 Read of size 8 at addr ffff88803ee9a108 by task swapper/0/0 Call Trace: <IRQ> __mutex_lock backlight_device_set_brightness appletb_inactivity_timer call_timer_fn run_timer_softirq handle_softirqs Allocated by task N: devm_backlight_device_register appletb_bl_probe Freed by task M: (concurrent hid_appletb_bl unbind path) Close both windows at once by reworking the tear-down in appletb_kbd_remove() and in the probe close_hw error path so that 1) hid_hw_close()/hid_hw_stop() run before the backlight cleanup, guaranteeing no further .event callback can fire and re-arm the timer, and 2) inside the "if (kbd->backlight_dev)" block, timer_delete_sync() runs before put_device(), so the softirq is drained before the final reference is dropped.
References
Fix within
Internet-facing 14 days
Internal At next upgrade
  • Not known to be exploited
  • Needs hands-on effort to exploit (estimated)
  • Gives an attacker full control (estimated)
Severity
7.8 High
Exploitation
<1% chance of attack within 30 days
Type
CWE-416Use After Free
Timeline
Published28 May 2026
Updated26 Oct 2026
First seen28 May 2026
Sources
CVE-2026-46213 · NVD
DEBIAN-CVE-2026-46213 · OSV
BELL-CVE-2026-46213 · OSV
UBUNTU-CVE-2026-46213 · OSV
CVE-2026-46213 · OSV
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