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Linux Kernel CVE-2026-53182

| EUVDEUVD-2026-39273 HIGH
2026-06-25 416baaa9-dc9f-4396-8d5f-8c081fb06d67 GHSA-q6qm-26ch-2w94
7.8
CVSS 3.1 · Vendor: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
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Severity by source

Vendor (416baaa9-dc9f-4396-8d5f-8c081fb06d67) PRIMARY
7.8 HIGH
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
vuln.today AI
7.8 HIGH

Local-only netlink path needing CAP_NET_ADMIN (PR:L) with no user interaction; heap corruption yields high confidentiality, integrity and availability impact within the kernel.

3.1 AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
4.0 AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
SUSE
HIGH
qualitative
Red Hat
7.0 MEDIUM
qualitative

Primary rating from Vendor (416baaa9-dc9f-4396-8d5f-8c081fb06d67).

CVSS VectorVendor: 416baaa9-dc9f-4396-8d5f-8c081fb06d67

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

5
Analysis Generated
Jun 28, 2026 - 09:23 vuln.today
CVSS changed
Jun 28, 2026 - 08:22 NVD
7.8 (HIGH)
Patch available
Jun 25, 2026 - 10:32 EUVD
CVE Published
Jun 25, 2026 - 09:16 cve.org
UNKNOWN (no severity yet)
CVE Published
Jun 25, 2026 - 09:16 cve.org
HIGH 7.8

DescriptionCVE.org

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

wifi: nl80211: reject oversized EMA RNR lists

nl80211_parse_rnr_elems() stores the parsed element count in a u8-backed cfg80211_rnr_elems::cnt field and uses that count to size the flexible array allocation.

Reject nested NL80211_ATTR_EMA_RNR_ELEMS input once the count reaches 255, before incrementing it again. This keeps the parser aligned with the data structure it fills and matches the existing bound check used by nl80211_parse_mbssid_elems().

AnalysisAI

Heap buffer overflow in the Linux kernel's nl80211 WiFi configuration subsystem (cfg80211) allows a local user with network-configuration privileges to corrupt kernel memory by supplying an oversized EMA (Enhanced Multiple BSSID Advertisement) RNR element list. The parser nl80211_parse_rnr_elems() stores its element count in a u8 field and uses it to size a flexible-array allocation, so submitting 256 or more nested NL80211_ATTR_EMA_RNR_ELEMS attributes wraps the counter and produces an undersized allocation that is then overrun. There is no public exploit identified at time of analysis, EPSS risk is low (0.18%, 8th percentile), and the issue is not in CISA KEV.

Technical ContextAI

The flaw lives in cfg80211/nl80211, the kernel's netlink-based 802.11 WiFi management interface used to configure access-point/beaconing parameters. EMA RNR (Reduced Neighbor Report) elements are part of multiple-BSSID advertisement used by APs to announce co-located BSSes. The root cause is an integer/counter truncation: cfg80211_rnr_elems::cnt is a u8 and is both incremented per parsed element and used to size the trailing flexible array. When the parsed count reaches 255 and is incremented again it wraps, desynchronizing the recorded count from the actual number of elements written, producing an out-of-bounds heap write - a classic CWE-787 (out-of-bounds write) / CWE-190 (integer wraparound) memory-safety bug. The fix rejects input once the count reaches 255 before the increment, mirroring the existing bound already present in nl80211_parse_mbssid_elems(). The supplied CWE field is N/A, so the weakness class is inferred from the code description.

RemediationAI

Vendor-released patch: upgrade to a fixed stable kernel - 6.1.176, 6.6.143, 6.12.94, 7.0.13, 6.18.36, or mainline 7.1 (or your distribution's build incorporating these commits). The authoritative fixes are the git.kernel.org stable commits listed above and tracked under https://nvd.nist.gov/vuln/detail/CVE-2026-53182; apply your distro's kernel security update as the primary action. Where immediate patching is not possible, reduce exposure by restricting CAP_NET_ADMIN: avoid granting that capability to untrusted users or containers, and ensure unprivileged user namespaces cannot reach this path for untrusted workloads (e.g., constrain or disable unprivileged netns/CAP_NET_ADMIN delegation for those tenants) - the trade-off is that legitimate in-container network configuration and WiFi AP/beaconing management will be blocked. There is no clean feature toggle for the specific EMA RNR parser short of the patch, so capability restriction is the main compensating control until the kernel is updated.

Vendor StatusVendor

SUSE

Severity: Important
Product Status
Container suse/sl-micro/6.0/base-os-container:2.1.3-7.168 Container suse/sl-micro/6.1/base-os-container:2.2.1-5.149 Affected
Container suse/sl-micro/6.0/rt-os-container:2.1.3-7.197 Container suse/sl-micro/6.1/rt-os-container:2.2.1-5.145 Affected
Image SLES15-SP7-Azure-3P Image SLES15-SP7-Azure-Basic Image SLES15-SP7-Azure-Standard Image SLES15-SP7-HPC-Azure Affected
Image SLES15-SP7-BYOS-Azure Image SLES15-SP7-BYOS-GCE Image SLES15-SP7-CHOST-BYOS-Aliyun Image SLES15-SP7-CHOST-BYOS-Azure Image SLES15-SP7-CHOST-BYOS-EC2 Image SLES15-SP7-CHOST-BYOS-GCE Image SLES15-SP7-CHOST-BYOS-GDC Image SLES15-SP7-CHOST-BYOS-SAP-CCloud Image SLES15-SP7-EC2 Image SLES15-SP7-EC2-ECS-HVM Image SLES15-SP7-GCE Image SLES15-SP7-HPC-BYOS-Azure Image SLES15-SP7-HPC-BYOS-EC2 Image SLES15-SP7-HPC-BYOS-GCE Image SLES15-SP7-Hardened-BYOS-Azure Image SLES15-SP7-Hardened-BYOS-EC2 Image SLES15-SP7-Hardened-BYOS-GCE Image SLES15-SP7-SAPCAL-Azure Image SLES15-SP7-SAPCAL-EC2 Image SLES15-SP7-SAPCAL-GCE Affected
Image SLES15-SP7-SAP-Azure Image SLES15-SP7-SAP-Azure-3P Image SLES15-SP7-SAP-BYOS-Azure Image SLES15-SP7-SAP-BYOS-EC2 Image SLES15-SP7-SAP-BYOS-GCE Image SLES15-SP7-SAP-EC2 Image SLES15-SP7-SAP-GCE Image SLES15-SP7-SAP-Hardened-Azure Image SLES15-SP7-SAP-Hardened-BYOS-Azure Image SLES15-SP7-SAP-Hardened-BYOS-EC2 Image SLES15-SP7-SAP-Hardened-BYOS-GCE Image SLES15-SP7-SAP-Hardened-GCE Affected

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CVE-2026-53182 vulnerability details – vuln.today

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