NVD

CVE-2025-39964 Detail

Modified After Enrichment

This CVE record has been updated after NVD enrichment efforts were completed. Enrichment data supplied by the NVD may require amendment due to these changes.

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.

Metrics

NVD enrichment efforts reference publicly available information to associate vector strings. CVSS information contributed by other sources is also displayed.

CVSS 4.0 Severity and Vector Strings:

NIST: NVD

N/A

NVD assessment not yet provided.

CVSS 3.x Severity and Vector Strings:

NIST: NVD

Base Score: 3.3 LOW

Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L

CVSS 2.0 Severity and Vector Strings:

National Institute of Standards and Technology

NIST: NVD

Base Score: N/A

NVD assessment not yet provided.

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://cert-portal.siemens.com/productcert/html/ssa-019113.html	siemens-SADP
https://git.kernel.org/stable/c/0f28c4adbc4a97437874c9b669fd7958a8c6d6ce	kernel.org	Patch
https://git.kernel.org/stable/c/1b34cbbf4f011a121ef7b2d7d6e6920a036d5285	kernel.org	Patch
https://git.kernel.org/stable/c/1f323a48e9b5ebfe6dc7d130fdf5c3c0e92a07c8	kernel.org	Patch
https://git.kernel.org/stable/c/45bcf60fe49b37daab1acee57b27211ad1574042	kernel.org	Patch
https://git.kernel.org/stable/c/7c4491b5644e3a3708f3dbd7591be0a570135b84	kernel.org	Patch
https://git.kernel.org/stable/c/9aee87da5572b3a14075f501752e209801160d3d	kernel.org	Patch
https://git.kernel.org/stable/c/e4c1ec11132ec466f7362a95f36a506ce4dc08c9	kernel.org	Patch

Weakness Enumeration

CWE-ID	CWE Name	Source
NVD-CWE-noinfo	Insufficient Information	NIST

Known Affected Software Configurations Switch to CPE 2.2

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Change History

6 change records found show changes

CVE Modified by siemens-SADP 7/14/2026 9:17:51 AM

Action

Type

Old Value

New Value

Added

Reference

https://cert-portal.siemens.com/productcert/html/ssa-019113.html

Added

Affected

[{"vendor":"Siemens","product":"SIMATIC S7-1500 CPU 1518-4 PN/DP MFP","defaultStatus":"unknown","versions":[{"version":"V3.1.6","lessThan":"*","versionType":"custom","status":"affected"}]},{"vendor":"Siemens","product":"SIMATIC S7-1500 CPU 1518-4 PN/DP MFP","defaultStatus":"unknown","versions":[{"version":"V3.1.6","lessThan":"*","versionType":"custom","status":"affected"}]},{"vendor":"Siemens","product":"SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP","defaultStatus":"unknown","versions":[{"version":"V3.1.6","lessThan":"*","versionType":"custom","status":"affected"}]},{"vendor":"Siemens","product":"SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP","defaultStatus":"unknown","versions":[{"version":"V3.1.6","lessThan":"*","versionType":"custom","status":"affected"}]},{"vendor":"Siemens","product":"SIPLUS S7-1500 CPU 1518-4 PN/DP MFP","defaultStatus":"unknown","versions":[{"version":"V3.1.6","lessThan":"*","versionType":"custom","status":"affected"}]}]

CVE Modified by kernel.org 6/17/2026 5:18:55 AM

Action

Type

Old Value

New Value

Added

Affected

Record truncated, showing 2048 of 2258 characters.
View Entire Change Record

[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","programFiles":["crypto/af_alg.c","include/crypto/if_alg.h"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","versions":[{"version":"8ff590903d5fc7f5a0a988c38267a3d08e6393a2","lessThan":"0f28c4adbc4a97437874c9b669fd7958a8c6d6ce","versionType":"git","status":"affected"},{"version":"8ff590903d5fc7f5a0a988c38267a3d08e6393a2","lessThan":"e4c1ec11132ec466f7362a95f36a506ce4dc08c9","versionType":"git","status":"affected"},{"version":"8ff590903d5fc7f5a0a988c38267a3d08e6393a2","lessThan":"1f323a48e9b5ebfe6dc7d130fdf5c3c0e92a07c8","versionType":"git","status":"affected"},{"version":"8ff590903d5fc7f5a0a988c38267a3d08e6393a2","lessThan":"7c4491b5644e3a3708f3dbd7591be0a570135b84","versionType":"git","status":"affected"},{"version":"8ff590903d5fc7f5a0a988c38267a3d08e6393a2","lessThan":"9aee87da5572b3a14075f501752e209801160d3d","versionType":"git","status":"affected"},{"version":"8ff590903d5fc7f5a0a988c38267a3d08e6393a2","lessThan":"45bcf60fe49b37daab1acee57b27211ad1574042","versionType":"git","status":"affected"},{"version":"8ff590903d5fc7f5a0a988c38267a3d08e6393a2","lessThan":"1b34cbbf4f011a121ef7b2d7d6e6920a036d5285","versionType":"git","status":"affected"}]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","programFiles":["crypto/af_alg.c","include/crypto/if_alg.h"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","versions":[{"version":"2.6.38","status":"affected"},{"version":"0","lessThan":"2.6.38","versionType":"semver","status":"unaffected"},{"version":"5.10.245","lessThanOrEqual":"5.10.*","versionType":"semver","status":"unaffected"},{"version":"5.15.194","lessThanOrEqual":"5.15.*","versionType":"semver","status":"unaffected"},{"version":"6.1.154","lessThanOrEqual":"6.1.*","versionType":"semver","status":"unaffected"},{"version":"6.6.108","lessThanOrEqual":"6.6.*","versionType":"semver","status":"unaffected"},{"version":"6.12.49","lessThanOrEqual":"6.12.*","versionType":"semver","status":"u

Initial Analysis by NIST 2/03/2026 9:20:11 AM

Action	Type	New Value
Added	CVSS V3.1	AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
Added	CWE	NVD-CWE-noinfo
Added	CPE Configuration	OR cpe:2.3:o:linux:linux_kernel::::::::* versions from (including) 6.7 up to (excluding) 6.12.49 cpe:2.3:o:linux:linux_kernel::::::::* versions from (including) 5.11 up to (excluding) 5.15.194 cpe:2.3:o:linux:linux_kernel:6.17:rc1::::::* cpe:2.3:o:linux:linux_kernel:6.17:rc2::::::* cpe:2.3:o:linux:linux_kernel:6.17:rc3::::::* cpe:2.3:o:linux:linux_kernel:6.17:rc4::::::* cpe:2.3:o:linux:linux_kernel:6.17:rc5::::::* cpe:2.3:o:linux:linux_kernel::::::::* versions from (including) 6.13 up to (excluding) 6.16.9 cpe:2.3:o:linux:linux_kernel::::::::* versions from (including) 6.2 up to (excluding) 6.6.108 cpe:2.3:o:linux:linux_kernel:6.17:rc6::::::* cpe:2.3:o:linux:linux_kernel::::::::* versions from (including) 5.16 up to (excluding) 6.1.154 cpe:2.3:o:linux:linux_kernel::::::::* versions from (including) 2.6.38 up to (excluding) 5.10.245
Added	Reference Type	kernel.org: https://git.kernel.org/stable/c/0f28c4adbc4a97437874c9b669fd7958a8c6d6ce Types: Patch
Added	Reference Type	kernel.org: https://git.kernel.org/stable/c/1b34cbbf4f011a121ef7b2d7d6e6920a036d5285 Types: Patch
Added	Reference Type	kernel.org: https://git.kernel.org/stable/c/1f323a48e9b5ebfe6dc7d130fdf5c3c0e92a07c8 Types: Patch
Added	Reference Type	kernel.org: https://git.kernel.org/stable/c/45bcf60fe49b37daab1acee57b27211ad1574042 Types: Patch
Added	Reference Type	kernel.org: https://git.kernel.org/stable/c/7c4491b5644e3a3708f3dbd7591be0a570135b84 Types: Patch
Added	Reference Type	kernel.org: https://git.kernel.org/stable/c/9aee87da5572b3a14075f501752e209801160d3d Types: Patch
Added	Reference Type	kernel.org: https://git.kernel.org/stable/c/e4c1ec11132ec466f7362a95f36a506ce4dc08c9 Types: Patch

New CVE Received from kernel.org 10/13/2025 10:15:34 AM

Action	Type	New Value
Added	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.
Added	Reference	https://git.kernel.org/stable/c/0f28c4adbc4a97437874c9b669fd7958a8c6d6ce
Added	Reference	https://git.kernel.org/stable/c/1b34cbbf4f011a121ef7b2d7d6e6920a036d5285
Added	Reference	https://git.kernel.org/stable/c/1f323a48e9b5ebfe6dc7d130fdf5c3c0e92a07c8
Added	Reference	https://git.kernel.org/stable/c/45bcf60fe49b37daab1acee57b27211ad1574042
Added	Reference	https://git.kernel.org/stable/c/7c4491b5644e3a3708f3dbd7591be0a570135b84
Added	Reference	https://git.kernel.org/stable/c/9aee87da5572b3a14075f501752e209801160d3d
Added	Reference	https://git.kernel.org/stable/c/e4c1ec11132ec466f7362a95f36a506ce4dc08c9

Quick Info

CVE Dictionary Entry:
CVE-2025-39964
NVD Published Date:
10/13/2025
NVD Last Modified:
07/14/2026
Source:
kernel.org

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Information Technology Laboratory

National Vulnerability Database

National Vulnerability Database

CVE-2025-39964 Detail

Description

Metrics

References to Advisories, Solutions, and Tools

Weakness Enumeration

Known Affected Software Configurations Switch to CPE 2.2

CPEs loading, please wait.

Change History

CVE Modified by siemens-SADP 7/14/2026 9:17:51 AM

CVE Modified by CISA-ADP 6/17/2026 5:18:55 AM

CVE Modified by kernel.org 6/17/2026 5:18:55 AM

Reanalysis by NIST 2/26/2026 6:05:10 PM

Initial Analysis by NIST 2/03/2026 9:20:11 AM

New CVE Received from kernel.org 10/13/2025 10:15:34 AM

Quick Info