VulnerabilityPublished 17 Sep 2026Updated 30 Oct 2026

CVE-2026-90417: Linux kernel · RDMA/cxgb4: Fix dereg_skb leak and double free in write_tpt_entry()

Source GCVE Database

Compare

Authoritative record:CVE-2026-90417· Medium

Not known to be exploited · fixed in 379cf06e6fe34af980064c6ccaf15d8e26ec4a42 : update Linux kernel when convenient.

Data as of 30 Oct 2026, 18:21 UTC

Severity

Medium

Rated Medium by Threat Radar's AI analysis · CVSS not yet scored by NVD

Thin evidence

One scorer or none

Patch: Available – fixed in 379cf06e6fe34af980064c6ccaf15d8e26ec4a42, 373f3716a2de7adc739269ebb4d87e5bf4dc180c, 68c1d2c085f205e8a5338bc3d3304f897deca4d9 +3

Exploitation evidence

Disclosed: evidence found.
CVE published 17 Sep 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 30 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

ghsa-ccpx-w89w-v2mx

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 0f8ab0b6e91b4d5302ceee5ec12ce54d81297635, < 379cf06e6fe34af980064c6ccaf15d8e26ec4a42	Fixed in 379cf06e6fe34af980064c6ccaf15d8e26ec4a42
LinuxLinux	Affected ≥ 0f8ab0b6e91b4d5302ceee5ec12ce54d81297635, < 373f3716a2de7adc739269ebb4d87e5bf4dc180c	Fixed in 373f3716a2de7adc739269ebb4d87e5bf4dc180c
LinuxLinux	Affected ≥ 0f8ab0b6e91b4d5302ceee5ec12ce54d81297635, < 68c1d2c085f205e8a5338bc3d3304f897deca4d9	Fixed in 68c1d2c085f205e8a5338bc3d3304f897deca4d9
LinuxLinux	Affected ≥ 0f8ab0b6e91b4d5302ceee5ec12ce54d81297635, < 26c6e9bc0b907b880c5d8486291f0452c8227fbe	Fixed in 26c6e9bc0b907b880c5d8486291f0452c8227fbe
LinuxLinux	Affected ≥ 0f8ab0b6e91b4d5302ceee5ec12ce54d81297635, < 6b15fc9bc117fb6597fa1c2cc30284aafe71101c	Fixed in 6b15fc9bc117fb6597fa1c2cc30284aafe71101c
LinuxLinux	Affected ≥ 0f8ab0b6e91b4d5302ceee5ec12ce54d81297635, < 2fcd26f4680143e9ec477069530548dbe20fce6f	Fixed in 2fcd26f4680143e9ec477069530548dbe20fce6f

AI-suggested

A fix has been implemented in the Linux kernel to address this issue by correcting skb ownership and freeing logic in write_tpt_entry() and related functions. Users should apply the official kernel updates containing this fix once available. Patch status is not explicitly confirmed in the provided data; check the vendor advisory or Linux kernel mailing lists for the official fixed versions and apply updates accordingly.

Description

A vulnerability in the Linux kernel's RDMA/cxgb4 driver involves a memory leak and a double free error in the write_tpt_entry() function. The issue occurs when the device is in a fatal error state or when allocation failures happen, leading to improper handling of skb buffers. This results in a memory leak of dereg_skb and a double free of skb, which could cause kernel instability or crashes. The flaw has been fixed by making write_tpt_entry() the sole owner of the skb and ensuring proper freeing behavior before handing off to the transmit path.

Impact

The vulnerability can lead to memory leaks and double free conditions within the kernel's RDMA driver, potentially causing kernel crashes or instability. There is no indication of remote code execution or privilege escalation in the provided data. No known exploits in the wild have been reported.

Summary

The Linux kernel RDMA/cxgb4 driver had a vulnerability where write_tpt_entry() could return errors before passing the caller's preallocated skb to the transmit path, causing dereg_skb to leak and skb to be freed twice. Specifically, c4iw_dereg_mr() ignored errors and leaked mhp->dereg_skb, while c4iw_get_dma_mr() freed skb a second time after dereg_mem() consumed it. The fix ensures write_tpt_entry() owns the skb exclusively and frees it on all error returns before handing off to c4iw_ofld_send(), which consumes skb on success or error, removing redundant frees.

References

Community reviews

Loading reviews…