CVE-2025-37952 [High] | Use-After-Free in Linux Kernel

In the Linux kernel, the following vulnerability has been resolved: ksmbd: Fix UAF in __close_file_table_ids A use-after-free is possible if one thread destroys the file via __ksmbd_close_fd while another thread holds a reference to it. The existing checks on fp->refcount are not sufficient to prevent this. The fix takes ft->lock around the section which removes the file from the file table. This prevents two threads acquiring the same file pointer via __close_file_table_ids, as well as the other functions which retrieve a file from the IDR and which already use this same lock.

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2026-03-16	0.02%	0.07%	+0.05%
2	2025-05-21	—	0.02%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2026-03-16

0.02%

0.07%

+0.05%

2025-05-21

—

0.02%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
7.8	3.1	HIGH	`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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:H) Serious risk that confidential data gets exposed in a big way. Integrity (I:H) They could widely tamper with or forge data—trust in the data is badly hurt. Availability (A:H) Could take the service down hard or make it unusable for people who depend on it.	1.8	5.9	[email protected]

Base score

Version

Severity

Vector

Exploitability

Impact

Score source

7.8

3.1

HIGH

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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:H): Serious risk that confidential data gets exposed in a big way.
Integrity (I:H): They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H): Could take the service down hard or make it unusable for people who depend on it.

1.8

5.9

[email protected]

OS Trackers for CVE-2025-37952

vendor	priority	summary	link
`debian`	unimportant	CVE-2025-37952 unimportant priority: Debian including 1 source packages (linux), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 4, open 1.	https://security-tracker.debian.org/tracker/CVE-2025-37952
`redhat`	—	—	https://access.redhat.com/security/cve/CVE-2025-37952
`suse`	high	CVE-2025-37952 severity important: SUSE including 26 source package names (cluster-md-kmp-default, dlm-kmp-default, …), 242 product×package rows across 48 product lines (SLES-LTSS-TERADATA 15 SP2, SUSE Linux Enterprise High Availability Extension 15 SP7, … (48 product lines)): Known Not Affected 242.	https://www.suse.com/security/cve/CVE-2025-37952/
`ubuntu`	medium	CVE-2025-37952 medium priority: Ubuntu including 158 source packages (linux, linux-allwinner-5.19, …), 1551 status rows across 10 suites (bionic, focal, jammy, noble, oracular, plucky, questing, trusty, upstream, xenial): DNE 1145, ignored 168, released 136, needed 77, not-affected 22, needs-triage 2, pending 1.	https://ubuntu.com/security/CVE-2025-37952

Affected software / configurations for CVE-2025-37952

Vendor	Product	Version	Raw CPE
linux	linux_kernel	>= 5.15, < 6.6.91	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	>= 6.7, < 6.12.29	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	>= 6.13, < 6.14.7	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	6.15	cpe:2.3:o:linux:linux_kernel:6.15:rc1::::::
linux	linux_kernel	6.15	cpe:2.3:o:linux:linux_kernel:6.15:rc2::::::
linux	linux_kernel	6.15	cpe:2.3:o:linux:linux_kernel:6.15:rc3::::::
linux	linux_kernel	6.15	cpe:2.3:o:linux:linux_kernel:6.15:rc4::::::
linux	linux_kernel	6.15	cpe:2.3:o:linux:linux_kernel:6.15:rc5::::::

References for CVE-2025-37952

URL	Tags
https://git.kernel.org/stable/c/16727e442568a46d9cca69fe2595896de86e120d	Patch
https://git.kernel.org/stable/c/36991c1ccde2d5a521577c448ffe07fcccfe104d	Patch
https://git.kernel.org/stable/c/9e9841e232b51171ddf3bc4ee517d5d28dc8cad6	Patch
https://git.kernel.org/stable/c/fec1f9e9a650e8e7011330a085c77e7bf2a08ea9	Patch

URL

CVE-2025-37952 | ksmbd: Fix UAF in __close_file_table_ids

Exploit prediction scoring system (EPSS) score for CVE-2025-37952

Common vulnerability scoring system (CVSS) metrics for CVE-2025-37952

Weakness enumeration for CVE-2025-37952

OS Trackers for CVE-2025-37952

Affected software / configurations for CVE-2025-37952

References for CVE-2025-37952