crypto: af_alg - Disallow concurrent writes in af_alg_sendmsg
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.
- BDU:2025-16058
- ALSA-2026:70402
- ALSA-2026:70403
- ALSA-2026:70459
- DLA-4379-1
- DSA-6053-1
- openSUSE-SU-2026:20416-1
- openSUSE-SU-2026:21555-1
- RHSA-2026:70402
- RHSA-2026:70403
- RHSA-2026:70459
- RHSA-2026:70498
- RHSA-2026:71326
- RHSA-2026:71327
- RHSA-2026:71565
- RHSA-2026:71569
- RHSA-2026:71592
- RHSA-2026:71594
- RHSA-2026:71601
- RHSA-2026:71606
- Published
- Oct 13, 2025
- Updated
- Sep 19, 2026
- EPSS
- 1.0% · 61th percentile
- CWE
- CWE-362
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Report tools
Action score
52
Plan
Add it to your regular patch cycle.
- CVSS
- 22 / 40 · 5.5 / 10
- CISA KEV
- 30 / 30 · Listed
- EPSS
- 0 / 30 · 1.0%
CISA SSVC decision
- Exploitation
- active
- Automatable
- no
- Technical impact
- total
Vulnrichment: CISA's decision-tree inputs.
CNA vs NVD score
- NVD
- 5.5
- CNA · Linux
- 7.8
- 2.3 point gap
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.
Actively exploited in the wild
CISA added this to its Known Exploited Vulnerabilities catalog on Sep 18, 2026. That signals real attacks, not theory.
Remediation deadline for government agencies: Sep 21, 2026.
Affected systems
| Vendor | Product | CPE |
|---|---|---|
| linux | linux kernel | cpe:2.3:o:linux:linux_kernel |
| siemens | simatic s7-1500 cpu 1518-4 pn\/dp mfp firmware | cpe:2.3:o:siemens:simatic_s7-1500_cpu_1518-4_pn\/dp_mfp_firmware |
| siemens | simatic s7-1500 cpu 1518-4 pn\/dp mfp | cpe:2.3:h:siemens:simatic_s7-1500_cpu_1518-4_pn\/dp_mfp |
| siemens | simatic s7-1500 cpu 1518f-4 pn\/dp mfp firmware | cpe:2.3:o:siemens:simatic_s7-1500_cpu_1518f-4_pn\/dp_mfp_firmware |
| siemens | simatic s7-1500 cpu 1518f-4 pn\/dp mfp | cpe:2.3:h:siemens:simatic_s7-1500_cpu_1518f-4_pn\/dp_mfp |
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- linux linux kernel2.6.38 and later · before 5.10.245
- linux linux kernel5.11 and later · before 5.15.194
- linux linux kernel5.16 and later · before 6.1.154
- linux linux kernel6.2 and later · before 6.6.108
- linux linux kernel6.7 and later · before 6.12.49
- linux linux kernel6.13 and later · before 6.16.9
- linux linux kernel6.17
- siemens simatic s7-1500 cpu 1518-4 pn/dp mfp firmware3.1.6 and later
- siemens simatic s7-1500 cpu 1518f-4 pn/dp mfp firmware3.1.6 and later
Versions reported by the vendor
Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.
Linux Linux
- 2.6.38affected
- 8ff590903d5fc7f5a0a988c38267a3d08e6393a2 and later · before 0f28c4adbc4a97437874c9b669fd7958a8c6d6ceaffected · git
- 8ff590903d5fc7f5a0a988c38267a3d08e6393a2 and later · before e4c1ec11132ec466f7362a95f36a506ce4dc08c9affected · git
- 8ff590903d5fc7f5a0a988c38267a3d08e6393a2 and later · before 1f323a48e9b5ebfe6dc7d130fdf5c3c0e92a07c8affected · git
- 8ff590903d5fc7f5a0a988c38267a3d08e6393a2 and later · before 7c4491b5644e3a3708f3dbd7591be0a570135b84affected · git
- 8ff590903d5fc7f5a0a988c38267a3d08e6393a2 and later · before 9aee87da5572b3a14075f501752e209801160d3daffected · git
- 8ff590903d5fc7f5a0a988c38267a3d08e6393a2 and later · before 45bcf60fe49b37daab1acee57b27211ad1574042affected · git
- 8ff590903d5fc7f5a0a988c38267a3d08e6393a2 and later · before 1b34cbbf4f011a121ef7b2d7d6e6920a036d5285affected · git
- before 2.6.38not affected · semver
- 5.10.245 and later · up to and including 5.10.*not affected · semver
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| AlmaLinux:8 | bpftool | before 4.18.0-553.166.1.el8_10 | 4.18.0-553.166.1.el8_10 |
| AlmaLinux:8 | kernel | before 4.18.0-553.166.1.el8_10 | 4.18.0-553.166.1.el8_10 |
| AlmaLinux:8 | kernel-abi-stablelists | before 4.18.0-553.166.1.el8_10 | 4.18.0-553.166.1.el8_10 |
| AlmaLinux:8 | kernel-core | before 4.18.0-553.166.1.el8_10 | 4.18.0-553.166.1.el8_10 |
| AlmaLinux:8 | kernel-cross-headers | before 4.18.0-553.166.1.el8_10 | 4.18.0-553.166.1.el8_10 |
| AlmaLinux:8 | kernel-debug | before 4.18.0-553.166.1.el8_10 | 4.18.0-553.166.1.el8_10 |
| AlmaLinux:8 | kernel-debug-core | before 4.18.0-553.166.1.el8_10 | 4.18.0-553.166.1.el8_10 |
| AlmaLinux:8 | kernel-debug-devel | before 4.18.0-553.166.1.el8_10 | 4.18.0-553.166.1.el8_10 |
| AlmaLinux:8 | kernel-debug-modules | before 4.18.0-553.166.1.el8_10 | 4.18.0-553.166.1.el8_10 |
| AlmaLinux:8 | kernel-debug-modules-extra | before 4.18.0-553.166.1.el8_10 | 4.18.0-553.166.1.el8_10 |
| AlmaLinux:8 | kernel-devel | before 4.18.0-553.166.1.el8_10 | 4.18.0-553.166.1.el8_10 |
| AlmaLinux:8 | kernel-doc | before 4.18.0-553.166.1.el8_10 | 4.18.0-553.166.1.el8_10 |
| AlmaLinux:8 | kernel-headers | before 4.18.0-553.166.1.el8_10 | 4.18.0-553.166.1.el8_10 |
| AlmaLinux:8 | kernel-modules | before 4.18.0-553.166.1.el8_10 | 4.18.0-553.166.1.el8_10 |
| AlmaLinux:8 | kernel-modules-extra | before 4.18.0-553.166.1.el8_10 | 4.18.0-553.166.1.el8_10 |
| AlmaLinux:8 | kernel-rt | before 4.18.0-553.166.1.rt7.507.el8_10 | 4.18.0-553.166.1.rt7.507.el8_10 |
| AlmaLinux:8 | kernel-rt-core | before 4.18.0-553.166.1.rt7.507.el8_10 | 4.18.0-553.166.1.rt7.507.el8_10 |
| AlmaLinux:8 | kernel-rt-debug | before 4.18.0-553.166.1.rt7.507.el8_10 | 4.18.0-553.166.1.rt7.507.el8_10 |
| AlmaLinux:8 | kernel-rt-debug-core | before 4.18.0-553.166.1.rt7.507.el8_10 | 4.18.0-553.166.1.rt7.507.el8_10 |
| AlmaLinux:8 | kernel-rt-debug-devel | before 4.18.0-553.166.1.rt7.507.el8_10 | 4.18.0-553.166.1.rt7.507.el8_10 |
| AlmaLinux:8 | kernel-rt-debug-modules | before 4.18.0-553.166.1.rt7.507.el8_10 | 4.18.0-553.166.1.rt7.507.el8_10 |
| AlmaLinux:8 | kernel-rt-debug-modules-extra | before 4.18.0-553.166.1.rt7.507.el8_10 | 4.18.0-553.166.1.rt7.507.el8_10 |
| AlmaLinux:8 | kernel-rt-devel | before 4.18.0-553.166.1.rt7.507.el8_10 | 4.18.0-553.166.1.rt7.507.el8_10 |
| AlmaLinux:8 | kernel-rt-modules | before 4.18.0-553.166.1.rt7.507.el8_10 | 4.18.0-553.166.1.rt7.507.el8_10 |
+96
Same product
linux: all recordsOther highest-scoring records for the same primary product.
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- CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV85Now
- CVE-2016-5195Race condition in mm/gup.c in the Linux kernel 2.x through 4.x before 4.8.3 allows local users to gain privileges by leveraging incorrect haKEV83Now
- CVE-2019-13272In the Linux kernel before 5.1.17, ptrace_link in kernel/ptrace.c mishandles the recording of the credentials of a process that wants to creKEV77This week
- CVE-2013-6282The (1) get_user and (2) put_user API functions in the Linux kernel before 3.5.5 on the v6k and v7 ARM platforms do not validate certain addKEV77This week
- CVE-2013-2094The perf_swevent_init function in kernel/events/core.c in the Linux kernel before 3.8.9 uses an incorrect integer data type, which allows loKEV77This week
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| Linux Linux | 0f28c4adbc4a97437874c9b669fd7958a8c6d6ce | Vendor (CNA) |
| Linux Linux | 1b34cbbf4f011a121ef7b2d7d6e6920a036d5285 | Vendor (CNA) |
| Linux Linux | 1f323a48e9b5ebfe6dc7d130fdf5c3c0e92a07c8 | Vendor (CNA) |
| Linux Linux | 45bcf60fe49b37daab1acee57b27211ad1574042 | Vendor (CNA) |
| Linux Linux | 7c4491b5644e3a3708f3dbd7591be0a570135b84 | Vendor (CNA) |
| Linux Linux | 9aee87da5572b3a14075f501752e209801160d3d | Vendor (CNA) |
| Linux Linux | e4c1ec11132ec466f7362a95f36a506ce4dc08c9 | Vendor (CNA) |
| AlmaLinux:bpftool | 4.18.0-553.166.1.el8_10 · AlmaLinux:8 | Package registry (OSV) |
| AlmaLinux:kernel | 4.18.0-553.166.1.el8_10 · AlmaLinux:8 | Package registry (OSV) |
| AlmaLinux:kernel-abi-stablelists | 4.18.0-553.166.1.el8_10 · AlmaLinux:8 | Package registry (OSV) |
| AlmaLinux:kernel-core | 4.18.0-553.166.1.el8_10 · AlmaLinux:8 | Package registry (OSV) |
| AlmaLinux:kernel-cross-headers | 4.18.0-553.166.1.el8_10 · AlmaLinux:8 | Package registry (OSV) |
| AlmaLinux:kernel-debug | 4.18.0-553.166.1.el8_10 · AlmaLinux:8 | Package registry (OSV) |
| AlmaLinux:kernel-debug-core | 4.18.0-553.166.1.el8_10 · AlmaLinux:8 | Package registry (OSV) |
| AlmaLinux:kernel-debug-devel | 4.18.0-553.166.1.el8_10 · AlmaLinux:8 | Package registry (OSV) |
| AlmaLinux:kernel-debug-modules | 4.18.0-553.166.1.el8_10 · AlmaLinux:8 | Package registry (OSV) |
| AlmaLinux:kernel-debug-modules-extra | 4.18.0-553.166.1.el8_10 · AlmaLinux:8 | Package registry (OSV) |
| AlmaLinux:kernel-devel | 4.18.0-553.166.1.el8_10 · AlmaLinux:8 | Package registry (OSV) |
| AlmaLinux:kernel-doc | 4.18.0-553.166.1.el8_10 · AlmaLinux:8 | Package registry (OSV) |
| Debian:linux | 6.1.158-1 · Debian:12 | Package registry (OSV) |
| Debian:linux-6.1 | 6.1.158-1~deb11u1 · Debian:11 | Package registry (OSV) |
| openSUSE:dtb-aarch64 | 6.4.0-150600.23.92.1 · openSUSE:Leap 15.6 | Package registry (OSV) |
| openSUSE:kernel-64kb | 6.4.0-150600.23.92.1 · openSUSE:Leap 15.6 | Package registry (OSV) |
| openSUSE:kernel-debug | 6.4.0-150600.23.92.1 · openSUSE:Leap 15.6 | Package registry (OSV) |
| Red Hat:bpftool | 0:4.18.0-553.166.1.el8_10 · Red Hat:enterprise_linux:8::baseos | Package registry (OSV) |
| Red Hat:bpftool-debuginfo | 0:4.18.0-553.166.1.el8_10 · Red Hat:enterprise_linux:8::baseos | Package registry (OSV) |
| Red Hat:kernel | 0:4.18.0-553.166.1.el8_10 · Red Hat:enterprise_linux:8::baseos | Package registry (OSV) |
| Red Hat:kernel-abi-stablelists | 0:4.18.0-553.166.1.el8_10 · Red Hat:enterprise_linux:8::baseos | Package registry (OSV) |
| Red Hat:kernel-core | 0:4.18.0-553.166.1.el8_10 · Red Hat:enterprise_linux:8::baseos | Package registry (OSV) |
| Red Hat:kernel-debug | 0:4.18.0-553.166.1.el8_10 · Red Hat:enterprise_linux:8::baseos | Package registry (OSV) |
+21
Exploit status
Weaponized
A ready exploit tool or active in-the-wild use is known for this vulnerability. This should be your top priority.
Evidence
- Proof-of-concept repository on GitHub ×2
Noroxi does not host or link to exploit code. Metasploit module names and Nuclei template ids are shown (names, not code); Exploit-DB entries and PoC repositories are given as counts only.
| Source | Kind | Date |
|---|---|---|
| Proof-of-concept repository on GitHub | stars:3 | 2025-11-13 |
| Proof-of-concept repository on GitHub | stars:0 | 2026-09-20 |
Research context
For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.
Timeline
From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.
- Published
- First PoC+31 d
- CISA KEV+340 d
- TodaySep 29, 2026+352 d
FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).
Patch and commit links
Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.
No commit or PR link among the references.
Credits
All researchersFinders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.
No credits in the CNA record.
Variant candidates
Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.
No nightly-computed relations.
Chain candidates
An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.
—
Bug bounty scope
No known public program.
Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).
Technical details
Attack conditions
- Someone with local access to the system can trigger it.
- A low-privileged account is enough.
- No user action is required.
- No special conditions are required; it is repeatable.
If successful
- Confidentiality
- none
- Integrity
- none
- Availability
- high · the service can be disrupted
- Attack vector
- Local
- Attack complexity
- Low
- Privileges required
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- None
- Integrity impact
- None
- Availability impact
- High
Weakness class (CWE)
CWE-362 · Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
nvd-primary
Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
Attack patterns (CAPEC)
ATT&CK techniques
—
Noroxi analysis
No Noroxi analysis for this record yet
We don't hand-write analysis for all 385,000+ vulnerabilities; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.
We use this product, ask for helpChange log
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
- git.kernel.org/stable/c/0f28c4adbc4a97437874c9b669fd7958a8c6d6ce
- git.kernel.org/stable/c/1b34cbbf4f011a121ef7b2d7d6e6920a036d5285
- git.kernel.org/stable/c/1f323a48e9b5ebfe6dc7d130fdf5c3c0e92a07c8
- git.kernel.org/stable/c/45bcf60fe49b37daab1acee57b27211ad1574042
- git.kernel.org/stable/c/7c4491b5644e3a3708f3dbd7591be0a570135b84
- git.kernel.org/stable/c/9aee87da5572b3a14075f501752e209801160d3d
- git.kernel.org/stable/c/e4c1ec11132ec466f7362a95f36a506ce4dc08c9
- cert-portal.siemens.com/productcert/html/ssa-019113.html
- www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-39964
Vendor advisories and official records. Exploit/PoC links are deliberately left out.