Linux Kernel up to 6.6.142/6.12.93/6.18.35/7.0.12 RDMA ib_umem_check_rereg privilege escalation

CVSS Meta Temp Score
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CTI Interest Score
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6.5$0-$5k0.00

Summaryinfo

A vulnerability marked as critical has been reported in Linux Kernel up to 6.6.142/6.12.93/6.18.35/7.0.12. This affects the function ib_umem_check_rereg of the component RDMA. Performing a manipulation results in an unknown weakness. This vulnerability is cataloged as CVE-2026-52908. There is no exploit available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as critical, was found in Linux Kernel up to 6.6.142/6.12.93/6.18.35/7.0.12. This affects the function ib_umem_check_rereg of the component RDMA. The impact remains unknown. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: RDMA: During rereg_mr ensure that REREG_ACCESS is compatible If IB_MR_REREG_ACCESS changes from RO to RW then the umem has to be re-evaluated to ensure it is properly pinned as RW. Since the umem is hidden inside each driver's mr struct add a ib_umem_check_rereg() function that each driver has to call before processing IB_MR_REREG_ACCESS. mlx4 has to retain its duplicate ib_access_writable check because it implements IB_MR_REREG_ACCESS | IB_MR_REREG_TRANS by changing both items in place sequentially while the MR is live, so it will continue to not support this combination.

The advisory is shared at git.kernel.org. This vulnerability is uniquely identified as CVE-2026-52908 since 06/09/2026. Technical details are known, but no exploit is available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 06/28/2026).

The vulnerability scanner Nessus provides a plugin with the ID 321868 (Debian dsa-6355 : ata-modules-6.12.90+deb13-armmp-di - security update), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 6.6.143, 6.12.94, 6.18.36 or 7.0.13 eliminates this vulnerability. Applying the patch 09dc18894148381d3bfc550083b1236043870dce/eba5df21eda0fe7418efbea2f799f8ea1b8ca94c/2904e985a2917b5dac65df82733065e78a65fc9d/50334a05a950840b39a1ce3d2a173b4183db9b3e/badad6fad60def1b9805559dd81dbab3d97b82aa is able to eliminate this problem. The bugfix is ready for download at git.kernel.org. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the databases at Tenable (321868), EUVD (EUVD-2026-38037) and CERT Bund (WID-SEC-2026-2031). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Affected

  • Open Source Linux Kernel

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.6
VulDB Meta Temp Score: 6.5

VulDB Base Score: 5.5
VulDB Temp Score: 5.3
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 7.8
CNA Vector (Linux): 🔒

CVSSv2info

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

Exploitinginfo

Class: Privilege escalation
CWE: Unknown
CAPEC: 🔒
ATT&CK: 🔒

Physical: Partially
Local: Yes
Remote: Partially

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 321868
Nessus Name: Debian dsa-6355 : ata-modules-6.12.90+deb13-armmp-di - security update

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 6.6.143/6.12.94/6.18.36/7.0.13
Patch: 09dc18894148381d3bfc550083b1236043870dce/eba5df21eda0fe7418efbea2f799f8ea1b8ca94c/2904e985a2917b5dac65df82733065e78a65fc9d/50334a05a950840b39a1ce3d2a173b4183db9b3e/badad6fad60def1b9805559dd81dbab3d97b82aa

Timelineinfo

06/09/2026 CVE reserved
06/19/2026 +10 days Advisory disclosed
06/19/2026 +0 days VulDB entry created
06/28/2026 +9 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-52908 (🔒)
GCVE (CVE): GCVE-0-2026-52908
GCVE (VulDB): GCVE-100-372369
EUVD: 🔒
CERT Bund: WID-SEC-2026-2031 - Linux Kernel: Mehrere Schwachstellen ermöglichen nicht spezifizierten Angriff

Entryinfo

Created: 06/19/2026 18:02
Updated: 06/28/2026 10:52
Changes: 06/19/2026 18:02 (58), 06/19/2026 19:05 (1), 06/22/2026 02:01 (2), 06/22/2026 14:06 (7), 06/28/2026 10:52 (11)
Complete: 🔍
Cache ID: 216::103

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

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