CVE-2025-39964 @ morris

"CVE-2025-39964"
"linux_kernel-3.10.0"
"kernel_release (uname -r): 3.10.0-962.3.2.lve1.5.89.el7.x86_64"
"kernel_version (uname -v): #1 SMP Thu Jul 9 15:55:31 UTC 2026"
"Am I vulnerable?"

Status

reviewing KEV

Priority

10.8

Match score

4.0

Risk

Other priv:user

CVSS

7.8 HIGH

Reason

cpe: linux_kernel; pkgs: linux_kernel; version: in-range: linux_kernel-3.10.0; KEV

Created

2026-09-19T10:15:34Z

Updated

2026-10-20T10:16:57Z

Package interrogation (copy)

Run on the host — click to copy a command. RPM

Package	Commands
linux_kernel-3.10.0

Inventory lookup

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Suggestions: linux_kernel

Same product CVEs in your queue

Other open tickets that look like the same product. Closed tickets are omitted unless they are already pegged to this CVE.

CVE	CVSS	KEV	Systems	Status	Matched	Already related
CVE-2026-53266	8.8	KEV	Archive	reviewing	linux_kernel	—
CVE-2024-50302	5.5	KEV	Archive, Janus, Library, Saiph	new	linux_kernel	—

Related CVE (same fix)

Point this ticket’s CVE at a higher-priority / same-fix primary so you only triage one.

Host OS / kernel

CloudLinux release 7.9 (Boris Yegorov) (7.9) · cloudlinux

Arch

x86_64

kernel_release

uname -r → 3.10.0-962.3.2.lve1.5.89.el7.x86_64

kernel_version

uname -v → #1 SMP Thu Jul 9 15:55:31 UTC 2026

For Linux kernel CVEs, kernel_version (Debian packaging / build string) often decides fixed vs not; kernel_release is used for upstream NVD range compares.

Same CVE on other hosts

Open the ticket for this CVE on another system.

System	Status	Priority	Updated
mufasa	reviewing	10.8	2026-10-20T10:16:57Z	Open
Library	not_applicable	5.34	2026-10-20T10:16:57Z	Open
Archive	not_applicable	4.17	2026-10-20T10:16:57Z	Open
Janus	not_applicable	4.17	2026-10-20T10:16:57Z	Open
Saiph	not_applicable	4.17	2026-10-20T10:16:57Z	Open

Description

In the Linux kernel, the following vulnerability has been resolved:

crypto: af_alg - Disallow concurrent writes in af_alg_sendmsg

Issuing two writes to the same af_alg socket is bogus as the
data will be interleaved in an unpredictable fashion.  Furthermore,
concurrent writes may create inconsistencies in the internal
socket state.

Disallow this by adding a new ctx->write field that indiciates
exclusive ownership for writing.

Determination

Confirmed. Site uid 1164 / home /home/rcijric can open AF_ALG. CVE-2025-39964 is locally reachable on morris.

Item | Status
Kernel | 3.10.0-962.3.2.lve1.5.89 — CONFIG_CRYPTO_USER_API=y, no ctx->write
CageFS | Does not strip AF_ALG
Remote | No. Needs a process as that uid
Vendor fix on this NVR | None expected
KEV | Yes (2026-09-18)

This is not LiteSpeed/OpenSSL. It is a local race: two threads sendmsg() on one AF_ALG fd. Realistic outcomes are oops or garbage crypto on that socket — not unauth WAN RCE.

Do not swap the LVE 3.10 kernel. 

Do:

Keep site SSH off unless required
Treat any shell on a domain account as the privilege needed to start the race
Watch CloudLinux kernel notes for 39964 / af_alg — do not hold your breath
Ticket text: KEV, local AF_ALG concurrent-write, reachable from CageFS uids, no patch on this NVR, not internet-facing

Same bucket as other “3.10 code present, local only, no ELS backport.” Scanner stays red; exposure is a logged-in site user, not port 443.

Update status

Add note only

Mitigation log

2026-09-22T13:36:53Z — reviewing

Confirmed. Site uid 1164 / home /home/rcijric can open AF_ALG. CVE-2025-39964 is locally reachable on morris. Item | Status Kernel | 3.10.0-962.3.2.lve1.5.89 — CONFIG_CRYPTO_USER_API=y, no ctx->write CageFS | Does not strip AF_ALG Remote | No. Needs a process as that uid Vendor fix on this NVR | None expected KEV | Yes (2026-09-18) This is not LiteSpeed/OpenSSL. It is a local race: two threads sendmsg() on one AF_ALG fd. Realistic outcomes are oops or garbage crypto on that socket — not unauth WAN RCE. Do not swap the LVE 3.10 kernel. Do: Keep site SSH off unless required Treat any shell on a domain account as the privilege needed to start the race Watch CloudLinux kernel notes for 39964 / af_alg — do not hold your breath Ticket text: KEV, local AF_ALG concurrent-write, reachable from CageFS uids, no patch on this NVR, not internet-facing Same bucket as other “3.10 code present, local only, no ELS backport.” Scanner stays red; exposure is a logged-in site user, not port 443.

References

NVD: CVE-2025-39964