CVE-2024-57891 [Medium] | Security Bypass in Linux Kernel

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().

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2026-06-15	0.03%	0.18%	+0.14%
2	2025-10-18	0.05%	0.03%	-0.02%
3	2025-10-11	—	0.05%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2026-06-15

0.03%

0.18%

+0.14%

2025-10-18

0.05%

0.03%

-0.02%

2025-10-11

—

0.05%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
5.5	3.1	MEDIUM	`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H` Click to expand Attack vector (AV:L) They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by. Attack complexity (AC:L) Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup. Privileges required (PR:L) A normal user session is enough; they don’t have to be admin. User interaction (UI:N) Nobody has to click “OK” or open a trap file; it can work without a victim helping. Scope (S:U) Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems. Confidentiality (C:N) Doesn’t really leak secrets in a meaningful way. Integrity (I:N) Data isn’t meaningfully altered or forged. Availability (A:H) Could take the service down hard or make it unusable for people who depend on it.	1.8	3.6	[email protected]

Base score

Version

Severity

Vector

Exploitability

Impact

Score source

5.5

3.1

MEDIUM

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H Click to expand

Attack vector (AV:L): They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by.
Attack complexity (AC:L): Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:L): A normal user session is enough; they don’t have to be admin.
User interaction (UI:N): Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U): Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N): Doesn’t really leak secrets in a meaningful way.
Integrity (I:N): Data isn’t meaningfully altered or forged.
Availability (A:H): Could take the service down hard or make it unusable for people who depend on it.

1.8

3.6

[email protected]

OS Trackers for CVE-2024-57891

vendor	priority	summary	link
`debian`	unimportant	CVE-2024-57891 unimportant priority: Debian including 1 source packages (linux), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5.	https://security-tracker.debian.org/tracker/CVE-2024-57891
`redhat`	—	—	https://access.redhat.com/security/cve/CVE-2024-57891
`suse`	medium	CVE-2024-57891 severity moderate: SUSE including 94 source package names (cluster-md-kmp-64kb-6.12.0-160000.6.1, cluster-md-kmp-default, …), 443 product×package rows across 76 product lines (Image SLES-Azure-3P, Image SLES-Azure-Basic, … (76 product lines)): Known Not Affected 245, Fixed 177, First Fixed 21.	https://www.suse.com/security/cve/CVE-2024-57891/
`ubuntu`	medium	CVE-2024-57891 medium priority: Ubuntu including 126 source packages (linux, linux-allwinner-5.19, …), 1008 status rows across 8 suites (bionic, focal, jammy, noble, oracular, trusty, upstream, xenial): DNE 690, ignored 146, not-affected 112, released 60.	https://ubuntu.com/security/CVE-2024-57891

Affected software / configurations for CVE-2024-57891

Vendor	Product	Version	Raw CPE
linux	linux_kernel	>= 6.12.1, < 6.12.9	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	6.12	cpe:2.3:o:linux:linux_kernel:6.12:-::::::
linux	linux_kernel	6.12	cpe:2.3:o:linux:linux_kernel:6.12:rc6::::::
linux	linux_kernel	6.12	cpe:2.3:o:linux:linux_kernel:6.12:rc7::::::
linux	linux_kernel	6.13	cpe:2.3:o:linux:linux_kernel:6.13:rc1::::::
linux	linux_kernel	6.13	cpe:2.3:o:linux:linux_kernel:6.13:rc2::::::
linux	linux_kernel	6.13	cpe:2.3:o:linux:linux_kernel:6.13:rc3::::::
linux	linux_kernel	6.13	cpe:2.3:o:linux:linux_kernel:6.13:rc4::::::
linux	linux_kernel	6.13	cpe:2.3:o:linux:linux_kernel:6.13:rc5::::::

References for CVE-2024-57891

URL	Tags
https://git.kernel.org/stable/c/18b2093f4598d8ee67a8153badc93f0fa7686b8a	Patch
https://git.kernel.org/stable/c/786362ce60d79967875f43e0ba55ad7a5376c133	Patch

URL

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

Exploit prediction scoring system (EPSS) score for CVE-2024-57891

Common vulnerability scoring system (CVSS) metrics for CVE-2024-57891

Weakness enumeration for CVE-2024-57891

OS Trackers for CVE-2024-57891

Affected software / configurations for CVE-2024-57891

References for CVE-2024-57891