🛡️ CVE-2024-36936 on Ubuntu — linux
Description
In the Linux kernel, the following vulnerability has been resolved: efi/unaccepted: touch soft lockup during memory accept Commit 50e782a86c98 ("efi/unaccepted: Fix soft lockups caused by parallel memory acceptance") has released the spinlock so other CPUs can do memory acceptance in parallel and not triggers softlockup on other CPUs. However the softlock up was intermittent shown up if the memory of the TD guest is large, and the timeout of softlockup is set to 1 second: RIP: 0010:_raw_spin_unlock_irqrestore Call Trace: ? __hrtimer_run_queues ? hrtimer_interrupt ? watchdog_timer_fn ? __sysvec_apic_timer_interrupt ? __pfx_watchdog_timer_fn ? sysvec_apic_timer_interrupt ? __hrtimer_run_queues ? hrtimer_interrupt ? asm_sysvec_apic_timer_interrupt ? _raw_spin_unlock_irqrestore ? __sysvec_apic_timer_interrupt ? sysvec_apic_timer_interrupt accept_memory try_to_accept_memory do_huge_pmd_anonymous_page get_page_from_freelist __handle_mm_fault __alloc_pages __folio_alloc ? __tdx_hypercall handle_mm_fault vma_alloc_folio do_user_addr_fault do_huge_pmd_anonymous_page exc_page_fault ? __do_huge_pmd_anonymous_page asm_exc_page_fault __handle_mm_fault When the local irq is enabled at the end of accept_memory(), the softlockup detects that the watchdog on single CPU has not been fed for a while. That is to say, even other CPUs will not be blocked by spinlock, the current CPU might be stunk with local irq disabled for a while, which hurts not only nmi watchdog but also softlockup. Chao Gao pointed out that the memory accept could be time costly and there was similar report before. Thus to avoid any softlocup detection during this stage, give the softlockup a flag to skip the timeout check at the end of accept_memory(), by invoking touch_softlockup_watchdog().
Distribution advisory
This page covers CVE-2024-36936 as tracked by Ubuntu, for the package linux. The fix is available in version 6.8.0-40.40; earlier versions remain affected.
How this vulnerability can be exploited
This issue can be reached with local access to the system, attack complexity is low, an attacker needs low-level privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality none, integrity none, availability high.
Affected software and timeline
Affected software: linux (fixed in 6.8.0-40.40), linux-allwinner-5.19, linux-aws (fixed in 6.8.0-1013.14), linux-aws-5.0, linux-aws-5.11, linux-aws-5.13, linux-aws-5.19, linux-aws-5.3, linux-aws-5.8, linux-aws-6.2, linux-aws-6.5, linux-aws-6.8 (fixed in 6.8.0-1013.14~22.04.1), linux-azure (fixed in 6.8.0-1012.14), linux-azure-5.11, linux-azure-5.13, linux-azure-5.19, linux-azure-5.3, linux-azure-5.8, linux-azure-6.2, linux-azure-6.5, linux-azure-6.8 (fixed in 6.8.0-1012.14~22.04.1), linux-azure-edge, linux-azure-fde, linux-azure-fde-5.19, linux-azure-fde-6.2, linux-gcp (fixed in 6.8.0-1012.13), linux-gcp-5.11, linux-gcp-5.13, linux-gcp-5.19, linux-gcp-5.3, linux-gcp-5.8, linux-gcp-6.2, linux-gcp-6.5, linux-gcp-6.8 (fixed in 6.8.0-1012.13~22.04.1), linux-gke (fixed in 6.8.0-1008.11), linux-gke-4.15, linux-gke-5.15, linux-gke-5.4, linux-gkeop-5.4, linux-hwe, linux-hwe-5.11, linux-hwe-5.13, linux-hwe-5.19, linux-hwe-5.8, linux-hwe-6.2, linux-hwe-6.5, linux-hwe-6.8 (fixed in 6.8.0-40.40~22.04.3), linux-hwe-edge, linux-ibm (fixed in 6.8.0-1010.10), linux-intel-5.13, linux-intel-iot-realtime, linux-lowlatency (fixed in 6.8.0-40.40.1), linux-lowlatency-hwe-5.19, linux-lowlatency-hwe-6.2, linux-lowlatency-hwe-6.5, linux-lowlatency-hwe-6.8 (fixed in 6.8.0-40.40.1~22.04.1), linux-nvidia (fixed in 6.8.0-1011.11), linux-nvidia-6.2, linux-nvidia-6.5, linux-nvidia-6.8 (fixed in 6.8.0-1011.11~22.04.1), linux-nvidia-lowlatency (fixed in 6.8.0-1011.11.1), linux-oem, linux-oem-5.10, linux-oem-5.13, linux-oem-5.14, linux-oem-5.17, linux-oem-5.6, linux-oem-6.0, linux-oem-6.1, linux-oem-6.5, linux-oem-6.8 (fixed in 6.8.0-1010.10), linux-oracle (fixed in 6.8.0-1010.10), linux-oracle-5.0, linux-oracle-5.11, linux-oracle-5.13, linux-oracle-5.3, linux-oracle-5.8, linux-oracle-6.5, linux-oracle-6.8 (fixed in 6.8.0-1010.10~22.04.1), linux-raspi (fixed in 6.8.0-1009.10), linux-raspi-realtime (fixed in 6.8.0-2008.8), linux-raspi2, linux-realtime (fixed in 6.8.1-1006.6), linux-riscv (fixed in 6.8.0-40.40.1), linux-riscv-5.11, linux-riscv-5.19, linux-riscv-5.8, linux-riscv-6.5, linux-riscv-6.8 (fixed in 6.8.0-40.40.1~22.04.1), linux-starfive-5.19, linux-starfive-6.2 and linux-starfive-6.5. Published on 30 May 2024 and last revised on 22 April 2026. No public exploit is currently recorded for this entry. Record sourced from OSV.
CVE-2024-36936 on other distributions
Each distribution ships its own build and its own fixed version. Pick the one you run:
Details
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Affected Packages
| Software | From version | Fixed in |
|---|---|---|
| linux | — | 6.8.0-40.40 |
| linux-allwinner-5.19 | — | — |
| linux-aws | — | 6.8.0-1013.14 |
| linux-aws-5.0 | — | — |
| linux-aws-5.11 | — | — |
| linux-aws-5.13 | — | — |
| linux-aws-5.19 | — | — |
| linux-aws-5.3 | — | — |
| linux-aws-5.8 | — | — |
| linux-aws-6.2 | — | — |
| linux-aws-6.5 | — | — |
| linux-aws-6.8 | — | 6.8.0-1013.14~22.04.1 |
| linux-azure | — | 6.8.0-1012.14 |
| linux-azure-5.11 | — | — |
| linux-azure-5.13 | — | — |
| linux-azure-5.19 | — | — |
| linux-azure-5.3 | — | — |
| linux-azure-5.8 | — | — |
| linux-azure-6.2 | — | — |
| linux-azure-6.5 | — | — |
| linux-azure-6.8 | — | 6.8.0-1012.14~22.04.1 |
| linux-azure-edge | — | — |
| linux-azure-fde | — | — |
| linux-azure-fde-5.19 | — | — |
| linux-azure-fde-6.2 | — | — |
| linux-gcp | — | 6.8.0-1012.13 |
| linux-gcp-5.11 | — | — |
| linux-gcp-5.13 | — | — |
| linux-gcp-5.19 | — | — |
| linux-gcp-5.3 | — | — |
| linux-gcp-5.8 | — | — |
| linux-gcp-6.2 | — | — |
| linux-gcp-6.5 | — | — |
| linux-gcp-6.8 | — | 6.8.0-1012.13~22.04.1 |
| linux-gke | — | 6.8.0-1008.11 |
| linux-gke-4.15 | — | — |
| linux-gke-5.15 | — | — |
| linux-gke-5.4 | — | — |
| linux-gkeop-5.4 | — | — |
| linux-hwe | — | — |
| linux-hwe-5.11 | — | — |
| linux-hwe-5.13 | — | — |
| linux-hwe-5.19 | — | — |
| linux-hwe-5.8 | — | — |
| linux-hwe-6.2 | — | — |
| linux-hwe-6.5 | — | — |
| linux-hwe-6.8 | — | 6.8.0-40.40~22.04.3 |
| linux-hwe-edge | — | — |
| linux-ibm | — | 6.8.0-1010.10 |
| linux-intel-5.13 | — | — |
| linux-intel-iot-realtime | — | — |
| linux-lowlatency | — | 6.8.0-40.40.1 |
| linux-lowlatency-hwe-5.19 | — | — |
| linux-lowlatency-hwe-6.2 | — | — |
| linux-lowlatency-hwe-6.5 | — | — |
| linux-lowlatency-hwe-6.8 | — | 6.8.0-40.40.1~22.04.1 |
| linux-nvidia | — | 6.8.0-1011.11 |
| linux-nvidia-6.2 | — | — |
| linux-nvidia-6.5 | — | — |
| linux-nvidia-6.8 | — | 6.8.0-1011.11~22.04.1 |
| linux-nvidia-lowlatency | — | 6.8.0-1011.11.1 |
| linux-oem | — | — |
| linux-oem-5.10 | — | — |
| linux-oem-5.13 | — | — |
| linux-oem-5.14 | — | — |
| linux-oem-5.17 | — | — |
| linux-oem-5.6 | — | — |
| linux-oem-6.0 | — | — |
| linux-oem-6.1 | — | — |
| linux-oem-6.5 | — | — |
| linux-oem-6.8 | — | 6.8.0-1010.10 |
| linux-oracle | — | 6.8.0-1010.10 |
| linux-oracle-5.0 | — | — |
| linux-oracle-5.11 | — | — |
| linux-oracle-5.13 | — | — |
| linux-oracle-5.3 | — | — |
| linux-oracle-5.8 | — | — |
| linux-oracle-6.5 | — | — |
| linux-oracle-6.8 | — | 6.8.0-1010.10~22.04.1 |
| linux-raspi | — | 6.8.0-1009.10 |
| linux-raspi-realtime | — | 6.8.0-2008.8 |
| linux-raspi2 | — | — |
| linux-realtime | — | 6.8.1-1006.6 |
| linux-riscv | — | 6.8.0-40.40.1 |
| linux-riscv-5.11 | — | — |
| linux-riscv-5.19 | — | — |
| linux-riscv-5.8 | — | — |
| linux-riscv-6.5 | — | — |
| linux-riscv-6.8 | — | 6.8.0-40.40.1~22.04.1 |
| linux-starfive-5.19 | — | — |
| linux-starfive-6.2 | — | — |
| linux-starfive-6.5 | — | — |
References
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