CVE-2026-46106 [Medium] | Security Vulnerability in Linux Kernel

In the Linux kernel, the following vulnerability has been resolved: eventfs: Hold eventfs_mutex and SRCU when remount walks events Commit 340f0c7067a9 ("eventfs: Update all the eventfs_inodes from the events descriptor") had eventfs_set_attrs() recurse through ei->children on remount. The walk only holds the rcu_read_lock() taken by tracefs_apply_options() over tracefs_inodes, which is wrong: - list_for_each_entry over ei->children races with the list_del_rcu() in eventfs_remove_rec() -- LIST_POISON1 deref, same shape as d2603279c7d6. - eventfs_inodes are freed via call_srcu(&eventfs_srcu, ...). rcu_read_lock() does not extend an SRCU grace period, so ti->private can be reclaimed under the walk. - The writes to ei->attr race with eventfs_set_attr(), which holds eventfs_mutex. Reproducer: while :; do mount -o remount,uid=$((RANDOM%1000)) /sys/kernel/tracing; done & while :; do echo "p:kp submit_bio" > /sys/kernel/tracing/kprobe_events echo > /sys/kernel/tracing/kprobe_events done Wrap the events portion of tracefs_apply_options() in eventfs_remount_lock()/_unlock() that take eventfs_mutex and srcu_read_lock(&eventfs_srcu). eventfs_set_attrs() doesn't sleep so the nested rcu_read_lock() is fine; lockdep_assert_held() pins the contract. Comment in tracefs_drop_inode() said "RCU cycle" -- it is SRCU.

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2026-06-26	0.17%	0.12%	-0.05%
2	2026-06-15	0.02%	0.17%	+0.15%
3	2026-05-28	—	0.02%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2026-06-26

0.17%

0.12%

-0.05%

2026-06-15

0.02%

0.17%

+0.15%

2026-05-28

—

0.02%

—

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-2026-46106

vendor	priority	summary	link
`debian`	unimportant	CVE-2026-46106 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-2026-46106
`redhat`	medium	—	https://access.redhat.com/security/cve/CVE-2026-46106
`suse`	medium	CVE-2026-46106 severity moderate: SUSE including 23 source package names (cluster-md-kmp-default, dlm-kmp-default, …), 129 product×package rows across 25 product lines (SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS, SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS, … (25 product lines)): Known Not Affected 125, Fixed 4.	https://www.suse.com/security/cve/CVE-2026-46106/
`ubuntu`	medium	CVE-2026-46106 medium priority: Ubuntu including 158 source packages (linux, linux-allwinner-5.19, …), 1422 status rows across 9 suites (bionic, focal, jammy, noble, questing, resolute, trusty, upstream, xenial): DNE 1024, ignored 169, released 84, not-affected 79, needed 66.	https://ubuntu.com/security/CVE-2026-46106

Affected software / configurations for CVE-2026-46106

Vendor	Product	Version	Raw CPE
linux	linux_kernel	>= 6.6.35, < 6.6.140	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	>= 6.9.6, < 6.12.88	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	>= 6.13, < 6.18.30	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	>= 6.19, < 7.0.7	cpe:2.3:o:linux:linux_kernel::::::::

References for CVE-2026-46106

URL	Tags
https://git.kernel.org/stable/c/07004a8c4b572171934390148ee48c4175c77eed	Patch
https://git.kernel.org/stable/c/44e64d8a432837308f4dda3ffe819f1ec092a0ba	Patch
https://git.kernel.org/stable/c/52b109f1b875b912d4ab2c5fdd8c322d47119d9b	Patch
https://git.kernel.org/stable/c/ae9cd0b46b1890040006a2fc5e905c5d6053fd02	Patch
https://git.kernel.org/stable/c/ed2ad73bcb0a7a6cc934097d4853b6d5124c317e	Patch

URL

CVE-2026-46106 | eventfs: Hold eventfs_mutex and SRCU when remount walks events

Exploit prediction scoring system (EPSS) score for CVE-2026-46106

Common vulnerability scoring system (CVSS) metrics for CVE-2026-46106

Weakness enumeration for CVE-2026-46106

GitHub Security Advisory for CVE-2026-46106

OS Trackers for CVE-2026-46106

Affected software / configurations for CVE-2026-46106

References for CVE-2026-46106