CVE-2025-38383 [Medium] | Security Vulnerability in Linux Kernel

In the Linux kernel, the following vulnerability has been resolved: mm/vmalloc: fix data race in show_numa_info() The following data-race was found in show_numa_info(): ================================================================== BUG: KCSAN: data-race in vmalloc_info_show / vmalloc_info_show read to 0xffff88800971fe30 of 4 bytes by task 8289 on cpu 0: show_numa_info mm/vmalloc.c:4936 [inline] vmalloc_info_show+0x5a8/0x7e0 mm/vmalloc.c:5016 seq_read_iter+0x373/0xb40 fs/seq_file.c:230 proc_reg_read_iter+0x11e/0x170 fs/proc/inode.c:299 .... write to 0xffff88800971fe30 of 4 bytes by task 8287 on cpu 1: show_numa_info mm/vmalloc.c:4934 [inline] vmalloc_info_show+0x38f/0x7e0 mm/vmalloc.c:5016 seq_read_iter+0x373/0xb40 fs/seq_file.c:230 proc_reg_read_iter+0x11e/0x170 fs/proc/inode.c:299 .... value changed: 0x0000008f -> 0x00000000 ================================================================== According to this report,there is a read/write data-race because m->private is accessible to multiple CPUs. To fix this, instead of allocating the heap in proc_vmalloc_init() and passing the heap address to m->private, vmalloc_info_show() should allocate the heap.

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2026-06-15	0.02%	0.10%	+0.09%
2	2025-07-26	—	0.02%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2026-06-15

0.02%

0.10%

+0.09%

2025-07-26

—

0.02%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
4.7	3.1	MEDIUM	`CVSS:3.1/AV:L/AC:H/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:H) Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work. 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.	1.0	3.6	[email protected]

Base score

Version

Severity

Vector

Exploitability

Impact

Score source

4.7

3.1

MEDIUM

CVSS:3.1/AV:L/AC:H/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:H): Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work.
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.

1.0

3.6

[email protected]

OS Trackers for CVE-2025-38383

vendor	priority	summary	link
`debian`	unimportant	CVE-2025-38383 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-2025-38383
`redhat`	medium	—	https://access.redhat.com/security/cve/CVE-2025-38383
`suse`	medium	CVE-2025-38383 severity moderate: SUSE including 68 source package names (cluster-md-kmp-64kb-6.12.0-160000.6.1, cluster-md-kmp-default-6.12.0-160000.6.1, …), 198 product×package rows across 31 product lines (Image SLES-Azure-3P, Image SLES-Azure-Basic, … (31 product lines)): Fixed 177, First Fixed 21.	https://www.suse.com/security/cve/CVE-2025-38383/
`ubuntu`	medium	CVE-2025-38383 medium priority: Ubuntu including 158 source packages (linux, linux-allwinner-5.19, …), 1414 status rows across 9 suites (bionic, focal, jammy, noble, plucky, questing, trusty, upstream, xenial): DNE 1017, ignored 153, not-affected 134, released 108, needs-triage 2.	https://ubuntu.com/security/CVE-2025-38383

Affected software / configurations for CVE-2025-38383

Vendor	Product	Version	Raw CPE
linux	linux_kernel	>= 6.9, < 6.12.37	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	>= 6.13, < 6.15.6	cpe:2.3:o:linux:linux_kernel::::::::

References for CVE-2025-38383

URL	Tags
https://git.kernel.org/stable/c/5c5f0468d172ddec2e333d738d2a1f85402cf0bc	Patch
https://git.kernel.org/stable/c/5c966f447a584ece3c70395898231aeb56256ee7	Patch
https://git.kernel.org/stable/c/ead91de35d9cd5c4f80ec51e6020f342079170af	Patch

URL

CVE-2025-38383 | mm/vmalloc: fix data race in show_numa_info()

Exploit prediction scoring system (EPSS) score for CVE-2025-38383

Common vulnerability scoring system (CVSS) metrics for CVE-2025-38383

Weakness enumeration for CVE-2025-38383

OS Trackers for CVE-2025-38383

Affected software / configurations for CVE-2025-38383

References for CVE-2025-38383