Linux Kernel up to 7.0.13 bnxt_re ib_verbs.c bnxt_re_alloc_ucontext information disclosure

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3.2	$0-$5k	0.87-

Summaryinfo

A vulnerability, which was classified as problematic, has been found in Linux Kernel up to 7.0.13. This vulnerability affects the function bnxt_re_alloc_ucontext of the file drivers/infiniband/hw/bnxt_re/ib_verbs.c of the component bnxt_re. Performing a manipulation results in information disclosure. This vulnerability was named CVE-2026-74584. The attack needs to be approached locally. There is no available exploit.

Detailsinfo

A vulnerability classified as problematic has been found in Linux Kernel up to 7.0.13. This affects the function bnxt_re_alloc_ucontext of the file drivers/infiniband/hw/bnxt_re/ib_verbs.c of the component bnxt_re. The manipulation with an unknown input leads to a information disclosure vulnerability. CWE is classifying the issue as CWE-200. The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. This is going to have an impact on confidentiality. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: RDMA/bnxt_re: zero shared page before exposing to userspace bnxt_re_alloc_ucontext() allocates uctx->shpg via __get_free_page(GFP_KERNEL). The buddy allocator does not zero pages without __GFP_ZERO, so the page contains stale kernel data from whatever object most recently freed it. The page is then mapped into userspace via vm_insert_page() under BNXT_RE_MMAP_SH_PAGE in bnxt_re_mmap(). The driver only ever writes 4 bytes (a u32 AVID) at offset BNXT_RE_AVID_OFFT (0x10) inside bnxt_re_create_ah(); the remaining 4092 bytes of the page are exposed to userspace unsanitised, leaking kernel memory contents. Any user with access to /dev/infiniband/uverbsX on a host with a bnxt_re device (typically rdma group membership) can read this data via a single mmap() at pgoff 0 after IB_USER_VERBS_CMD_GET_CONTEXT. Other shared pages in the same file already use get_zeroed_page() correctly: drivers/infiniband/hw/bnxt_re/ib_verbs.c srq->uctx_srq_page = (void *)get_zeroed_page(GFP_KERNEL); cq->uctx_cq_page = (void *)get_zeroed_page(GFP_KERNEL); uctx->shpg is the only outlier. Bring it in line with the existing convention by switching to get_zeroed_page().

The advisory is shared at git.kernel.org. This vulnerability is uniquely identified as CVE-2026-74584 since 08/15/2026. The exploitability is told to be easy. An attack has to be approached locally. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1592 for this issue.

Upgrading to version 5.10.260, 5.15.211, 6.1.177, 6.6.144, 6.12.95, 6.18.37 or 7.0.14 eliminates this vulnerability. Applying the patch 53c97e9882f4e747b4ac31b211317c2eba541af9/9896bdfd21d918e9f26a52bc6109cc77970ee0b1/9128c2411b83a64c0a69d2ff059c741bde25a9cc/c19b360fa10c521c0b681875cdaa51545d45a491/a3ed2daab02b2a706e882ad31b5c3c4f33cb5bb1/e2b143df29003d2704b51f62e9297006953dbacb/c75f8ce4baa29ae57fe615c6a2c5101f59b8b89a/f6b079629becfa977f9c51fe53ad2e6dcc55ef44 is able to eliminate this problem.

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Type

• Operating System

Vendor

• Linux

Name

• Kernel

Version

• 5.10.259
• 5.15.210
• 6.1.176
• 6.6.143
• 6.12.0
• 6.12.1
• 6.12.2
• 6.12.3
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• 6.12.87
• 6.12.88
• 6.12.89
• 6.12.90
• 6.12.91
• 6.12.92
• 6.12.93
• 6.12.94
• 6.18.0
• 6.18.1
• 6.18.2
• 6.18.3
• 6.18.4
• 6.18.5
• 6.18.6
• 6.18.7
• 6.18.8
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• 6.18.31
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• 6.18.34
• 6.18.35
• 6.18.36
• 7.0.0
• 7.0.1
• 7.0.2
• 7.0.3
• 7.0.4
• 7.0.5
• 7.0.6
• 7.0.7
• 7.0.8
• 7.0.9
• 7.0.10
• 7.0.11
• 7.0.12
• 7.0.13

License

• open-source

Website

• Vendor: https://www.kernel.org/

CPE 2.3info

• 🔒
• 🔒
• 🔒

CPE 2.2info

• 🔒
• 🔒
• 🔒

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 3.3
VulDB Meta Temp Score: 3.2

VulDB Base Score: 3.3
VulDB Temp Score: 3.2
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AV	AC	Au	C	I	A
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock

VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Information disclosure
CWE: CWE-200 / CWE-284 / CWE-266
CAPEC: 🔒
ATT&CK: 🔒

Physical: Partially
Local: Yes
Remote: No

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 5.10.260/5.15.211/6.1.177/6.6.144/6.12.95/6.18.37/7.0.14
Patch: 53c97e9882f4e747b4ac31b211317c2eba541af9/9896bdfd21d918e9f26a52bc6109cc77970ee0b1/9128c2411b83a64c0a69d2ff059c741bde25a9cc/c19b360fa10c521c0b681875cdaa51545d45a491/a3ed2daab02b2a706e882ad31b5c3c4f33cb5bb1/e2b143df29003d2704b51f62e9297006953dbacb/c75f8ce4baa29ae57fe615c6a2c5101f59b8b89a/f6b079629becfa977f9c51fe53ad2e6dcc55ef44

Timelineinfo

08/15/2026 CVE reserved
08/22/2026 +7 days Advisory disclosed
08/22/2026 +0 days VulDB entry created
08/22/2026 +0 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-74584 (🔒)
GCVE (CVE): GCVE-0-2026-74584
GCVE (VulDB): GCVE-100-394353

Entryinfo

Created: 08/22/2026 16:46
Changes: 08/22/2026 16:46 (60)
Complete: 🔍
Cache ID: 216::103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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