CVE-2026-46053

net: rds: fix MR cleanup on copy error

Published May 27, 2026 CVSS 3.1 · 7.8 High EPSS < 1% KEV · Not listed

Description

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

net: rds: fix MR cleanup on copy error

__rds_rdma_map() hands sg/pages ownership to the transport after
get_mr() succeeds. If copying the generated cookie back to user space
fails after that point, the error path must not free those resources
again before dropping the MR reference.

Remove the duplicate unpin/free from the put_user() failure branch so
that MR teardown is handled only through the existing final cleanup
path.

Analysis

Technical impact

The bug in the Linux kernel's RDS transport involves __rds_rdma_map() incorrectly handing ownership of sg/pages to the transport after a successful get_mr(). When copying the resulting cookie back to user space fails, the code previously freed those resources again, resulting in a duplicate unpin and free. This double‑free can corrupt kernel memory or cause a crash. The flaw is characterized as a resource mismanagement vulnerability (CWE‑763).

Affected Systems

All Linux kernel builds with RDS support before the patch, including the 5.6 release‑candidate series (rc3–rc7). Systems running these kernels and with RDS enabled are vulnerable until the fix is applied.

Risk and Exploitability

With a CVSS score of 7.8 the vulnerability is medium to high severity. The EPSS score of less than 1% indicates a very low chance of exploitation. The vulnerability is not listed in the CISA KEV catalog. The likely attack vector involves triggering an RDS resource allocation followed by a failure to copy the cookie to user space, which may be induced by malformed or malicious RDS traffic from within network reach or by local exploitation when RDS is enabled. Until patched, the risk of kernel memory corruption or a denial‑of‑service attack exists.

Affected Products

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

Linux

unaffected

Version	Status	Constraints
`0d4597c8c5abdeeaf50774066c16683f30184dc8`	affected	< 91a44b406bc1f9e1c5da0cb7d0d5991b43b79147
`0d4597c8c5abdeeaf50774066c16683f30184dc8`	affected	< 106dc689206610cfa2098f593fdd1e020c997835
`0d4597c8c5abdeeaf50774066c16683f30184dc8`	affected	< ec55a86f7fba7d9111df94b9c11a4755ed492995
`0d4597c8c5abdeeaf50774066c16683f30184dc8`	affected	< 8fdbb6262a4a3ed44a0830a7793903b54bb27bdc
`0d4597c8c5abdeeaf50774066c16683f30184dc8`	affected	< d95cea9298be1ba8876e3f156be96d3a492085ca
`0d4597c8c5abdeeaf50774066c16683f30184dc8`	affected	< 033370ffb3c9c0264d19f8ba9ef769523266589a
`0d4597c8c5abdeeaf50774066c16683f30184dc8`	affected	< b3cb8cae530b2727d8245684148bb49425f6765c
`0d4597c8c5abdeeaf50774066c16683f30184dc8`	affected	< 8141a2dc70080eda1aedc0389ed2db2b292af5bd

Linux

affected

Version	Status	Constraints
`5.6`	affected	—
`0`	unaffected	< 5.6
`5.10.258`	unaffected	≤ 5.10.*
`5.15.209`	unaffected	≤ 5.15.*
`6.1.175`	unaffected	≤ 6.1.*
`6.6.140`	unaffected	≤ 6.6.*
`6.12.86`	unaffected	≤ 6.12.*
`6.18.27`	unaffected	≤ 6.18.*
`7.0.4`	unaffected	≤ 7.0.*
`7.1`	unaffected	≤ *

Configuration 1 [-]

OR	cpe:2.3:o:linux:linux_kernel::::::::
	cpe:2.3:o:linux:linux_kernel::::::::
	cpe:2.3:o:linux:linux_kernel::::::::
	cpe:2.3:o:linux:linux_kernel::::::::
	cpe:2.3:o:linux:linux_kernel::::::::
	cpe:2.3:o:linux:linux_kernel::::::::
	cpe:2.3:o:linux:linux_kernel::::::::
	cpe:2.3:o:linux:linux_kernel:5.6:-::::::
	cpe:2.3:o:linux:linux_kernel:5.6:rc3::::::
	cpe:2.3:o:linux:linux_kernel:5.6:rc4::::::
	cpe:2.3:o:linux:linux_kernel:5.6:rc5::::::
	cpe:2.3:o:linux:linux_kernel:5.6:rc6::::::
	cpe:2.3:o:linux:linux_kernel:5.6:rc7::::::

No data.

Vendor Product Versions

Linux

Linux Kernel

Version	Status	Scheme	Platform
`[0d4597c8c5abdeeaf50774066c16683f30184dc8,8fdbb6262a4a3ed44a0830a7793903b54bb27bdc)`	affected	code_commit	—
`[0d4597c8c5abdeeaf50774066c16683f30184dc8,d95cea9298be1ba8876e3f156be96d3a492085ca)`	affected	code_commit	—
`[0d4597c8c5abdeeaf50774066c16683f30184dc8,033370ffb3c9c0264d19f8ba9ef769523266589a)`	affected	code_commit	—
`[0d4597c8c5abdeeaf50774066c16683f30184dc8,b3cb8cae530b2727d8245684148bb49425f6765c)`	affected	code_commit	—
`[0d4597c8c5abdeeaf50774066c16683f30184dc8,8141a2dc70080eda1aedc0389ed2db2b292af5bd)`	affected	code_commit	—

Linux

Linux Kernel

Version	Status	Scheme	Platform
`5.6`	affected	generic	—
`[0,5.6)`	unaffected	semver	—
`[6.6.140,6.7.0)`	unaffected	semver	—
`[6.12.86,6.13.0)`	unaffected	semver	—
`[6.18.27,6.19.0)`	unaffected	semver	—
`[7.0.4,7.1.0)`	unaffected	semver	—
`[7.1-rc1,*]`	unaffected	semver	—

Remediation

No solution or workaround provided in the CVE record.

OpenCVE Recommended Actions

Apply the kernel patch that removes the duplicate unpin/free or upgrade to a kernel release that contains the fix.
If upgrading is not immediately possible, disable RDS support in the kernel configuration (e.g., set CONFIG_RDS=n) or unload the rds module at runtime.
Monitor system logs for RDS copy errors and avoid running untrusted code that could trigger the MR allocation path until the fix is in place.

Generated by OpenCVE AI on June 18, 2026 at 07:32 UTC.

Tracking

Advisories

Source	ID	Title
Debian DLA	DLA-4664-1	linux security update
Debian DLA	DLA-4665-1	linux security update
Debian DLA	DLA-4671-1	linux-6.1 security update
Ubuntu USN	USN-8488-1	Linux kernel vulnerabilities
Ubuntu USN	USN-8489-1	Linux kernel (OEM) vulnerabilities
Ubuntu USN	USN-8488-2	Linux kernel (Raspberry Pi) vulnerabilities
Ubuntu USN	USN-8507-1	Linux kernel (NVIDIA) vulnerabilities
Ubuntu USN	USN-8567-1	Linux kernel vulnerabilities
Ubuntu USN	USN-8569-1	Linux kernel (HWE) vulnerabilities
Ubuntu USN	USN-8574-1	Linux kernel (GCP FIPS) vulnerabilities
Ubuntu USN	USN-8575-1	Linux kernel vulnerabilities
Ubuntu USN	USN-8576-1	Linux kernel (NVIDIA Tegra) vulnerabilities
Ubuntu USN	USN-8574-2	Linux kernel vulnerabilities
Ubuntu USN	USN-8595-1	Linux kernel (Oracle) vulnerabilities
Ubuntu USN	USN-8596-1	Linux kernel (NVIDIA) vulnerabilities
Ubuntu USN	USN-8575-2	Linux kernel vulnerabilities
Ubuntu USN	USN-8576-2	Linux kernel (NVIDIA Tegra) vulnerabilities
Ubuntu USN	USN-8597-1	Linux kernel (IBM) vulnerabilities
Ubuntu USN	USN-8575-3	Linux kernel vulnerabilities
Ubuntu USN	USN-8595-2	Linux kernel (AWS) vulnerabilities
Ubuntu USN	USN-8603-1	Linux kernel (Azure) vulnerabilities
Ubuntu USN	USN-8606-1	Linux kernel (Azure) vulnerabilities
Ubuntu USN	USN-8607-1	Linux kernel (Azure CVM) vulnerabilities
Ubuntu USN	USN-8608-1	Linux kernel (Azure FIPS) vulnerabilities
Ubuntu USN	USN-8609-1	Linux kernel (Azure CVM) vulnerabilities
Ubuntu USN	USN-8610-1	Linux kernel (Azure CVM) vulnerabilities
Ubuntu USN	USN-8574-3	Linux kernel vulnerabilities
Ubuntu USN	USN-8595-3	Linux kernel (AWS) vulnerabilities
Ubuntu USN	USN-8619-1	Linux kernel (HWE) vulnerabilities
Ubuntu USN	USN-8620-1	Linux kernel vulnerabilities
Ubuntu USN	USN-8620-2	Linux kernel (Azure FIPS) vulnerabilities
Ubuntu USN	USN-8620-3	Linux kernel (Intel IoTG) vulnerabilities
Ubuntu USN	USN-8620-4	Linux kernel (Intel IoTG) vulnerabilities
Ubuntu USN	USN-8665-1	Linux kernel (Raspberry Pi) vulnerabilities
Ubuntu USN	USN-8668-1	Linux kernel (GCP) vulnerabilities
Ubuntu USN	USN-8668-2	Linux kernel (Raspberry Pi) vulnerabilities

Metrics

No CVSS v4.0

Attack Vector Local

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploit prediction score: < 1% (0.129% probability within 30 days)

Key SSVC decision points have not yet been added.

References

Link	Providers
https://git.kernel.org/stable/c/033370ffb3c9c0264d19f8ba9ef769523266589a
https://git.kernel.org/stable/c/106dc689206610cfa2098f593fdd1e020c997835
https://git.kernel.org/stable/c/8141a2dc70080eda1aedc0389ed2db2b292af5bd
https://git.kernel.org/stable/c/8fdbb6262a4a3ed44a0830a7793903b54bb27bdc
https://git.kernel.org/stable/c/91a44b406bc1f9e1c5da0cb7d0d5991b43b79147
https://git.kernel.org/stable/c/b3cb8cae530b2727d8245684148bb49425f6765c
https://git.kernel.org/stable/c/d95cea9298be1ba8876e3f156be96d3a492085ca
https://git.kernel.org/stable/c/ec55a86f7fba7d9111df94b9c11a4755ed492995
https://lore.kernel.org/linux-cve-announce/2026052754-CVE-2026-46053-a24e@gregkh/T
https://nvd.nist.gov/vuln/detail/CVE-2026-46053
https://www.cve.org/CVERecord?id=CVE-2026-46053

History

Jun 16, 2026 3:15 PM Weaknesses updated. Affected versions updated View changes

Type	Values Removed	Values Added
Weaknesses		NVD-CWE-noinfo
CPEs		cpe:2.3:o:linux:linux_kernel:5.6:-:::::: cpe:2.3:o:linux:linux_kernel:5.6:rc3:::::: cpe:2.3:o:linux:linux_kernel:5.6:rc4:::::: cpe:2.3:o:linux:linux_kernel:5.6:rc5:::::: cpe:2.3:o:linux:linux_kernel:5.6:rc6:::::: cpe:2.3:o:linux:linux_kernel:5.6:rc7::::::

Jun 1, 2026 5:00 PM Added references View changes

Type	Values Removed	Values Added
References		https://git.kernel.org/stable/c/106dc689206610cfa2098f593fdd1e020c997835 https://git.kernel.org/stable/c/91a44b406bc1f9e1c5da0cb7d0d5991b43b79147 https://git.kernel.org/stable/c/ec55a86f7fba7d9111df94b9c11a4755ed492995

May 30, 2026 11:00 AM Scoring metrics updated View changes

Type	Values Removed	Values Added
Metrics	cvssV3_1 `{'score': 7.0, 'vector': 'CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H'}`	cvssV3_1 `{'score': 7.8, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'}`

May 28, 2026 3:15 AM Weaknesses updated View changes

Type	Values Removed	Values Added
Weaknesses	CWE-415

May 28, 2026 12:15 AM Weaknesses updated. Added references. Scoring metrics updated View changes

Type	Values Removed	Values Added
Weaknesses		CWE-763
References		https://lore.kernel.org/linux-cve-announce/2026052754-CVE-2026-46053-a24e@gregkh/T https://nvd.nist.gov/vuln/detail/CVE-2026-46053 https://www.cve.org/CVERecord?id=CVE-2026-46053
Metrics	threat_severity `None`	cvssV3_1 `{'score': 7.0, 'vector': 'CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H'}` threat_severity `Important`

May 27, 2026 8:45 PM Weaknesses updated View changes

Type	Values Removed	Values Added
Weaknesses		CWE-415

May 27, 2026 2:15 PM Description updated. Title updated. First appearance in the feed. Affected versions updated. Affected vendors updated. Added references View changes

Type	Values Removed	Values Added
Description		In the Linux kernel, the following vulnerability has been resolved: net: rds: fix MR cleanup on copy error __rds_rdma_map() hands sg/pages ownership to the transport after get_mr() succeeds. If copying the generated cookie back to user space fails after that point, the error path must not free those resources again before dropping the MR reference. Remove the duplicate unpin/free from the put_user() failure branch so that MR teardown is handled only through the existing final cleanup path.
Title		net: rds: fix MR cleanup on copy error
First Time appeared		Linux Linux linux Kernel
CPEs		cpe:2.3:o:linux:linux_kernel::::::::
Vendors & Products		Linux Linux linux Kernel
References		https://git.kernel.org/stable/c/033370ffb3c9c0264d19f8ba9ef769523266589a https://git.kernel.org/stable/c/8141a2dc70080eda1aedc0389ed2db2b292af5bd https://git.kernel.org/stable/c/8fdbb6262a4a3ed44a0830a7793903b54bb27bdc https://git.kernel.org/stable/c/b3cb8cae530b2727d8245684148bb49425f6765c https://git.kernel.org/stable/c/d95cea9298be1ba8876e3f156be96d3a492085ca