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Vulnerability · Published Jan 15, 2025 · Assigned by Linux

CVE-2024-57891sched_ext: Fix invalid irq restore in scx_ops_bypass()

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 8% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS NVD)5.5Medium
Exploit odds (30 days)0.2%top 92.4% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known

Official description

In the Linux kernel, the following vulnerability has been resolved: sched_ext: Fix invalid irq restore in scx_ops_bypass() While adding outer irqsave/restore locking, 0e7ffff1b811 ("scx: Fix raciness in scx_ops_bypass()") forgot to convert an inner rq_unlock_irqrestore() to rq_unlock() which could re-enable IRQ prematurely leading to the following warning: raw_local_irq_restore() called with IRQs enabled WARNING: CPU: 1 PID: 96 at kernel/locking/irqflag-debug.c:10 warn_bogus_irq_restore+0x30/0x40 ... Sched_ext: create_dsq (enabling) pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : warn_bogus_irq_restore+0x30/0x40 lr : warn_bogus_irq_restore+0x30/0x40 ... Call trace: warn_bogus_irq_restore+0x30/0x40 (P) warn_bogus_irq_restore+0x30/0x40 (L) scx_ops_bypass+0x224/0x3b8 scx_ops_enable.isra.0+0x2c8/0xaa8 bpf_scx_reg+0x18/0x30 ... irq event stamp: 33739 hardirqs last enabled at (33739): [<ffff8000800b699c>] scx_ops_bypass+0x174/0x3b8 hardirqs last disabled at (33738): [<ffff800080d48ad4>] _raw_spin_lock_irqsave+0xb4/0xd8 Drop the stray _irqrestore().

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:13linux6.12.9-1DEBIAN-CVE-2024-57891
Debian:14linux6.12.9-1DEBIAN-CVE-2024-57891
Ubuntu:22.04:LTSlinux-allwinner-5.19no fix listedUBUNTU-CVE-2024-57891
Ubuntu:22.04:LTSlinux-aws-5.19no fix listedUBUNTU-CVE-2024-57891
Ubuntu:22.04:LTSlinux-aws-6.2no fix listedUBUNTU-CVE-2024-57891
Ubuntu:22.04:LTSlinux-aws-6.5no fix listedUBUNTU-CVE-2024-57891
Ubuntu:22.04:LTSlinux-azure-5.19no fix listedUBUNTU-CVE-2024-57891
Ubuntu:22.04:LTSlinux-azure-6.2no fix listedUBUNTU-CVE-2024-57891
Ubuntu:22.04:LTSlinux-azure-6.5no fix listedUBUNTU-CVE-2024-57891
Ubuntu:22.04:LTSlinux-azure-fde-5.19no fix listedUBUNTU-CVE-2024-57891
Ubuntu:22.04:LTSlinux-azure-fde-6.2no fix listedUBUNTU-CVE-2024-57891
Ubuntu:22.04:LTSlinux-gcp-5.19no fix listedUBUNTU-CVE-2024-57891
Ubuntu:22.04:LTSlinux-gcp-6.2no fix listedUBUNTU-CVE-2024-57891
Ubuntu:22.04:LTSlinux-gcp-6.5no fix listedUBUNTU-CVE-2024-57891
Ubuntu:22.04:LTSlinux-hwe-5.19no fix listedUBUNTU-CVE-2024-57891
Ubuntu:22.04:LTSlinux-hwe-6.2no fix listedUBUNTU-CVE-2024-57891
Ubuntu:22.04:LTSlinux-hwe-6.5no fix listedUBUNTU-CVE-2024-57891
Ubuntu:22.04:LTSlinux-intel-iot-realtimeno fix listedUBUNTU-CVE-2024-57891
Ubuntu:22.04:LTSlinux-lowlatency-hwe-5.19no fix listedUBUNTU-CVE-2024-57891
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.2no fix listedUBUNTU-CVE-2024-57891
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.5no fix listedUBUNTU-CVE-2024-57891
Ubuntu:22.04:LTSlinux-nvidia-6.2no fix listedUBUNTU-CVE-2024-57891
Ubuntu:22.04:LTSlinux-nvidia-6.5no fix listedUBUNTU-CVE-2024-57891
Ubuntu:22.04:LTSlinux-oem-5.17no fix listedUBUNTU-CVE-2024-57891
Ubuntu:22.04:LTSlinux-oem-6.0no fix listedUBUNTU-CVE-2024-57891
Ubuntu:22.04:LTSlinux-oem-6.1no fix listedUBUNTU-CVE-2024-57891
Ubuntu:22.04:LTSlinux-oem-6.5no fix listedUBUNTU-CVE-2024-57891
Ubuntu:22.04:LTSlinux-oracle-6.5no fix listedUBUNTU-CVE-2024-57891
Ubuntu:24.04:LTSlinux-raspi-realtimeno fix listedUBUNTU-CVE-2024-57891
Ubuntu:22.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2024-57891
Ubuntu:22.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2024-57891
Ubuntu:22.04:LTSlinux-riscv-5.19no fix listedUBUNTU-CVE-2024-57891
Ubuntu:22.04:LTSlinux-riscv-6.5no fix listedUBUNTU-CVE-2024-57891
Ubuntu:22.04:LTSlinux-starfive-5.19no fix listedUBUNTU-CVE-2024-57891
Ubuntu:22.04:LTSlinux-starfive-6.2no fix listedUBUNTU-CVE-2024-57891
Ubuntu:22.04:LTSlinux-starfive-6.5no fix listedUBUNTU-CVE-2024-57891

Affected products (as reported)

VendorProductVersions
Linux Linux 0e7ffff1b8117b05635c87d3c9099f6aa9c9b689 – before 786362ce60d79967875f43e0ba55ad7a5376c1330e7ffff1b8117b05635c87d3c9099f6aa9c9b689 – before 18b2093f4598d8ee67a8153badc93f0fa7686b8a
Linux Linux 6.12

References