CVE-2026-90219

RDMA/cxgb4: Free debugfs on registration failure

Published Sep 17, 2026 CVSS n/a EPSS < 1% KEV · Not listed

Description

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

RDMA/cxgb4: Free debugfs on registration failure

c4iw_alloc() creates the per-device debugfs tree (dev->debugfs_root via
setup_debugfs()), but it is removed only in c4iw_remove(), not in
c4iw_dealloc(). When RDMA device registration fails, the registration
worker's err_dealloc_ctx path calls c4iw_dealloc() directly, bypassing
c4iw_remove(), so the debugfs dentries leak and outlive the freed
c4iw_dev.

Move debugfs_remove_recursive() into c4iw_dealloc() so every path that
frees ctx->dev also removes its debugfs tree.

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
`49ea0c036ede81f126f1a9389d377999fdf5c5a1`	affected	< 459b59f7ed56511d6529311cb4e5e482ebfcfb8e
`49ea0c036ede81f126f1a9389d377999fdf5c5a1`	affected	< cd60992f09b7e83bfd3c76e3bb06b29f3e2fa0a8
`49ea0c036ede81f126f1a9389d377999fdf5c5a1`	affected	< c332d9e7dce234d8bef78271d003a68ee943b61b
`49ea0c036ede81f126f1a9389d377999fdf5c5a1`	affected	< f98e894ec029a752cf9c7f7834741bead0fb463d
`49ea0c036ede81f126f1a9389d377999fdf5c5a1`	affected	< 479a7f90060e62bdd9bb4036ec0a70bf460f6d23
`49ea0c036ede81f126f1a9389d377999fdf5c5a1`	affected	< 046425412529dbfca1433c8bef5641b271b4ab2a
`49ea0c036ede81f126f1a9389d377999fdf5c5a1`	affected	< ea41b5630fa3d9877ce9ed8832cf5575f742bfbb
`49ea0c036ede81f126f1a9389d377999fdf5c5a1`	affected	< fe5c16bb6252dea6025b748257ddc3b2665495b0
`98fa991017981b52dcc4dc3924fc8e1e83e41bf4`	affected	—
`af92e4a595e006b498c44b617ea38f697eca3469`	affected	—
`9c0cec79e5c914662c2cf98b4a729c0fcc8c872e`	affected	—
`4.19.130`	affected	< 4.20
`5.4.49`	affected	< 5.5
`5.7.6`	affected	< 5.8

Linux

affected

Version	Status	Constraints
`5.8`	affected	—
`0`	unaffected	< 5.8
`5.10.270`	unaffected	≤ 5.10.*
`5.15.221`	unaffected	≤ 5.15.*
`6.1.188`	unaffected	≤ 6.1.*
`6.6.157`	unaffected	≤ 6.6.*
`6.12.110`	unaffected	≤ 6.12.*
`6.18.52`	unaffected	≤ 6.18.*
`7.2.6`	unaffected	≤ 7.2.*
`7.3`	unaffected	≤ *

No data.

Vendor Product Versions

Linux

Linux Kernel

Version	Status	Scheme	Platform
`[49ea0c036ede81f126f1a9389d377999fdf5c5a1,459b59f7ed56511d6529311cb4e5e482ebfcfb8e)`	affected	code_commit	—
`[49ea0c036ede81f126f1a9389d377999fdf5c5a1,cd60992f09b7e83bfd3c76e3bb06b29f3e2fa0a8)`	affected	code_commit	—
`[49ea0c036ede81f126f1a9389d377999fdf5c5a1,c332d9e7dce234d8bef78271d003a68ee943b61b)`	affected	code_commit	—
`[49ea0c036ede81f126f1a9389d377999fdf5c5a1,f98e894ec029a752cf9c7f7834741bead0fb463d)`	affected	code_commit	—
`[49ea0c036ede81f126f1a9389d377999fdf5c5a1,479a7f90060e62bdd9bb4036ec0a70bf460f6d23)`	affected	code_commit	—
`[49ea0c036ede81f126f1a9389d377999fdf5c5a1,046425412529dbfca1433c8bef5641b271b4ab2a)`	affected	code_commit	—
`[49ea0c036ede81f126f1a9389d377999fdf5c5a1,ea41b5630fa3d9877ce9ed8832cf5575f742bfbb)`	affected	code_commit	—
`[49ea0c036ede81f126f1a9389d377999fdf5c5a1,fe5c16bb6252dea6025b748257ddc3b2665495b0)`	affected	code_commit	—
`98fa991017981b52dcc4dc3924fc8e1e83e41bf4`	affected	code_commit	—
`af92e4a595e006b498c44b617ea38f697eca3469`	affected	code_commit	—
`9c0cec79e5c914662c2cf98b4a729c0fcc8c872e`	affected	code_commit	—
`[4.19.130,4.20)`	affected	semver	—
`[5.4.49,5.5)`	affected	semver	—
`[5.7.6,5.8)`	affected	semver	—

Linux

Linux Kernel

Version	Status	Scheme	Platform
`5.8`	affected	semver	—
`[0,5.8)`	unaffected	semver	—
`[5.10.270,5.11.0)`	unaffected	semver	—
`[5.15.221,5.16.0)`	unaffected	semver	—
`[6.1.188,6.2.0)`	unaffected	semver	—
`[6.6.157,6.7.0)`	unaffected	semver	—
`[6.12.110,6.13.0)`	unaffected	semver	—
`[6.18.52,6.19.0)`	unaffected	semver	—
`[7.2.6,7.3.0)`	unaffected	semver	—
`[7.3-rc1,*]`	unaffected	semver	—

Remediation

No solution or workaround provided in the CVE record

Tracking

Advisories

Source	ID	Title
Debian DLA	DLA-4817-1	linux-6.12 security update
Debian DLA	DLA-4841-1	linux security update
Debian DSA	DSA-6528-1	linux security update
Ubuntu USN	USN-8961-1	Linux kernel vulnerabilities
Ubuntu USN	USN-9019-1	Linux kernel (Azure) vulnerabilities
Ubuntu USN	USN-9020-1	Linux kernel vulnerabilities
Ubuntu USN	USN-9022-1	Linux kernel vulnerabilities
Ubuntu USN	USN-9023-1	Linux kernel vulnerabilities
Ubuntu USN	USN-9024-1	Linux kernel vulnerabilities
Ubuntu USN	USN-9025-1	Linux kernel vulnerabilities
Ubuntu USN	USN-9026-1	Linux kernel (Azure) vulnerabilities
Ubuntu USN	USN-9029-1	Linux kernel (Raspberry Pi) vulnerabilities
Ubuntu USN	USN-9039-1	Linux kernel (Azure CVM) vulnerabilities
Ubuntu USN	USN-9040-1	Linux kernel (Low Latency NVIDIA) vulnerabilities
Ubuntu USN	USN-9066-1	Linux kernel (HWE) vulnerabilities
Ubuntu USN	USN-9091-1	Linux kernel (NVIDIA Tegra) vulnerabilities

Metrics

No CVSS v4.0

No CVSS v3.1

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploit prediction score: < 1% (0.227% probability within 30 days)

Key SSVC decision points have not yet been added.

References

Link	Providers
https://git.kernel.org/stable/c/046425412529dbfca1433c8bef5641b271b4ab2a
https://git.kernel.org/stable/c/459b59f7ed56511d6529311cb4e5e482ebfcfb8e
https://git.kernel.org/stable/c/479a7f90060e62bdd9bb4036ec0a70bf460f6d23
https://git.kernel.org/stable/c/c332d9e7dce234d8bef78271d003a68ee943b61b
https://git.kernel.org/stable/c/cd60992f09b7e83bfd3c76e3bb06b29f3e2fa0a8
https://git.kernel.org/stable/c/ea41b5630fa3d9877ce9ed8832cf5575f742bfbb
https://git.kernel.org/stable/c/f98e894ec029a752cf9c7f7834741bead0fb463d
https://git.kernel.org/stable/c/fe5c16bb6252dea6025b748257ddc3b2665495b0

History

Sep 19, 2026 4:15 AM Weaknesses updated View changes

Type	Values Removed	Values Added
Weaknesses		CWE-399 CWE-401

Sep 17, 2026 4:30 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: RDMA/cxgb4: Free debugfs on registration failure c4iw_alloc() creates the per-device debugfs tree (dev->debugfs_root via setup_debugfs()), but it is removed only in c4iw_remove(), not in c4iw_dealloc(). When RDMA device registration fails, the registration worker's err_dealloc_ctx path calls c4iw_dealloc() directly, bypassing c4iw_remove(), so the debugfs dentries leak and outlive the freed c4iw_dev. Move debugfs_remove_recursive() into c4iw_dealloc() so every path that frees ctx->dev also removes its debugfs tree.
Title		RDMA/cxgb4: Free debugfs on registration failure
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/046425412529dbfca1433c8bef5641b271b4ab2a https://git.kernel.org/stable/c/459b59f7ed56511d6529311cb4e5e482ebfcfb8e https://git.kernel.org/stable/c/479a7f90060e62bdd9bb4036ec0a70bf460f6d23 https://git.kernel.org/stable/c/c332d9e7dce234d8bef78271d003a68ee943b61b https://git.kernel.org/stable/c/cd60992f09b7e83bfd3c76e3bb06b29f3e2fa0a8 https://git.kernel.org/stable/c/ea41b5630fa3d9877ce9ed8832cf5575f742bfbb https://git.kernel.org/stable/c/f98e894ec029a752cf9c7f7834741bead0fb463d https://git.kernel.org/stable/c/fe5c16bb6252dea6025b748257ddc3b2665495b0