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Vulnerability · Published Oct 21, 2024 · Assigned by Linux

CVE-2024-49976tracing/timerlat: Drop interface_lock in stop_kthread()

Medium 5.5

In plain English

A medium-severity security flaw in Linux from Linux. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 7% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS NVD)5.5Medium
Exploit odds (30 days)0.2%top 92.6% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

In the Linux kernel, the following vulnerability has been resolved: tracing/timerlat: Drop interface_lock in stop_kthread() stop_kthread() is the offline callback for "trace/osnoise:online", since commit 5bfbcd1ee57b ("tracing/timerlat: Add interface_lock around clearing of kthread in stop_kthread()"), the following ABBA deadlock scenario is introduced: T1 | T2 [BP] | T3 [AP] osnoise_hotplug_workfn() | work_for_cpu_fn() | cpuhp_thread_fun() | _cpu_down() | osnoise_cpu_die() mutex_lock(&interface_lock) | | stop_kthread() | cpus_write_lock() | mutex_lock(&interface_lock) cpus_read_lock() | cpuhp_kick_ap() | As the interface_lock here in just for protecting the "kthread" field of the osn_var, use xchg() instead to fix this issue. Also use for_each_online_cpu() back in stop_per_cpu_kthreads() as it can take cpu_read_lock() again.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:13linux6.11.4-1DEBIAN-CVE-2024-49976
Debian:14linux6.11.4-1DEBIAN-CVE-2024-49976
Ubuntu:24.04:LTSlinux6.8.0-54.56UBUNTU-CVE-2024-49976
Ubuntu:22.04:LTSlinux-allwinner-5.19no fix listedUBUNTU-CVE-2024-49976
Ubuntu:24.04:LTSlinux-aws6.8.0-1023.25UBUNTU-CVE-2024-49976
Ubuntu:22.04:LTSlinux-aws-5.19no fix listedUBUNTU-CVE-2024-49976
Ubuntu:22.04:LTSlinux-aws-6.2no fix listedUBUNTU-CVE-2024-49976
Ubuntu:22.04:LTSlinux-aws-6.5no fix listedUBUNTU-CVE-2024-49976
Ubuntu:22.04:LTSlinux-aws-6.86.8.0-1023.25~22.04.1UBUNTU-CVE-2024-49976
Ubuntu:24.04:LTSlinux-azure6.8.0-1025.30UBUNTU-CVE-2024-49976
Ubuntu:22.04:LTSlinux-azure-5.19no fix listedUBUNTU-CVE-2024-49976
Ubuntu:22.04:LTSlinux-azure-6.2no fix listedUBUNTU-CVE-2024-49976
Ubuntu:22.04:LTSlinux-azure-6.5no fix listedUBUNTU-CVE-2024-49976
Ubuntu:22.04:LTSlinux-azure-6.86.8.0-1025.30~22.04.1UBUNTU-CVE-2024-49976
Ubuntu:22.04:LTSlinux-azure-fde-5.19no fix listedUBUNTU-CVE-2024-49976
Ubuntu:22.04:LTSlinux-azure-fde-6.2no fix listedUBUNTU-CVE-2024-49976
Ubuntu:24.04:LTSlinux-gcp6.8.0-1024.26UBUNTU-CVE-2024-49976
Ubuntu:22.04:LTSlinux-gcp-5.19no fix listedUBUNTU-CVE-2024-49976
Ubuntu:22.04:LTSlinux-gcp-6.2no fix listedUBUNTU-CVE-2024-49976
Ubuntu:22.04:LTSlinux-gcp-6.5no fix listedUBUNTU-CVE-2024-49976
Ubuntu:22.04:LTSlinux-gcp-6.86.8.0-1024.26~22.04.1UBUNTU-CVE-2024-49976
Ubuntu:24.04:LTSlinux-gke6.8.0-1019.23UBUNTU-CVE-2024-49976
Ubuntu:24.04:LTSlinux-gkeop6.8.0-1006.8UBUNTU-CVE-2024-49976
Ubuntu:22.04:LTSlinux-hwe-5.19no fix listedUBUNTU-CVE-2024-49976
Ubuntu:22.04:LTSlinux-hwe-6.2no fix listedUBUNTU-CVE-2024-49976
Ubuntu:22.04:LTSlinux-hwe-6.5no fix listedUBUNTU-CVE-2024-49976
Ubuntu:22.04:LTSlinux-hwe-6.86.8.0-57.59~22.04.1UBUNTU-CVE-2024-49976
Ubuntu:24.04:LTSlinux-ibm6.8.0-1022.22UBUNTU-CVE-2024-49976
Ubuntu:22.04:LTSlinux-intel-iot-realtimeno fix listedUBUNTU-CVE-2024-49976
Ubuntu:24.04:LTSlinux-lowlatency6.8.0-54.56.1UBUNTU-CVE-2024-49976
Ubuntu:22.04:LTSlinux-lowlatency-hwe-5.19no fix listedUBUNTU-CVE-2024-49976
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.2no fix listedUBUNTU-CVE-2024-49976
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.5no fix listedUBUNTU-CVE-2024-49976
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.86.8.0-54.56.1~22.04.1UBUNTU-CVE-2024-49976
Ubuntu:24.04:LTSlinux-nvidia6.8.0-1022.25UBUNTU-CVE-2024-49976
Ubuntu:22.04:LTSlinux-nvidia-6.2no fix listedUBUNTU-CVE-2024-49976
Ubuntu:22.04:LTSlinux-nvidia-6.5no fix listedUBUNTU-CVE-2024-49976
Ubuntu:22.04:LTSlinux-nvidia-6.86.8.0-1022.25~22.04.2UBUNTU-CVE-2024-49976
Ubuntu:24.04:LTSlinux-nvidia-lowlatency6.8.0-1022.25.2UBUNTU-CVE-2024-49976
Ubuntu:22.04:LTSlinux-oem-5.17no fix listedUBUNTU-CVE-2024-49976
Ubuntu:22.04:LTSlinux-oem-6.0no fix listedUBUNTU-CVE-2024-49976
Ubuntu:22.04:LTSlinux-oem-6.1no fix listedUBUNTU-CVE-2024-49976
Ubuntu:24.04:LTSlinux-oem-6.116.11.0-1015.15UBUNTU-CVE-2024-49976
Ubuntu:22.04:LTSlinux-oem-6.5no fix listedUBUNTU-CVE-2024-49976
Ubuntu:24.04:LTSlinux-oem-6.86.8.0-1024.24UBUNTU-CVE-2024-49976
Ubuntu:24.04:LTSlinux-oracle6.8.0-1020.21UBUNTU-CVE-2024-49976
Ubuntu:22.04:LTSlinux-oracle-6.5no fix listedUBUNTU-CVE-2024-49976
Ubuntu:22.04:LTSlinux-oracle-6.86.8.0-1020.21~22.04.1UBUNTU-CVE-2024-49976
Ubuntu:24.04:LTSlinux-raspi6.8.0-1019.23UBUNTU-CVE-2024-49976
Ubuntu:22.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2024-49976
Ubuntu:24.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2024-49976
Ubuntu:22.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2024-49976
Ubuntu:24.04:LTSlinux-riscv6.8.0-53.55.1UBUNTU-CVE-2024-49976
Ubuntu:22.04:LTSlinux-riscv-5.19no fix listedUBUNTU-CVE-2024-49976
Ubuntu:22.04:LTSlinux-riscv-6.5no fix listedUBUNTU-CVE-2024-49976
Ubuntu:22.04:LTSlinux-riscv-6.86.8.0-53.55.1~22.04.1UBUNTU-CVE-2024-49976
Ubuntu:22.04:LTSlinux-starfive-5.19no fix listedUBUNTU-CVE-2024-49976
Ubuntu:22.04:LTSlinux-starfive-6.2no fix listedUBUNTU-CVE-2024-49976
Ubuntu:22.04:LTSlinux-starfive-6.5no fix listedUBUNTU-CVE-2024-49976

Affected products (as reported)

VendorProductVersions
Linux Linux b4fdabffae14cca2c80d99bd81f3f27239ac7f5e – before a4a05ceffe8fad68b45de38fe2311bda619e76e24679272d5252720746fd9c5465352cbc5665f230 – before 09cb44cc3d3df7ade2cebc939d6257a2fa8afc7a5bfbcd1ee57b607fd29e4645c7f350dd385dd9ad – before db8571a9a098086608c11a15856ff585789e67e85bfbcd1ee57b607fd29e4645c7f350dd385dd9ad – before b484a02c9cedf8703eff8f0756f94618004bd1656.6.51 – before 6.6.556.10.10 – before 6.10.14
Linux Linux 6.11

References