VulnerabilityPublished 17 Sep 2026Updated 21 Oct 2026

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

Affects Linux kernelSource CVE Database V5

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

Data as of 26 Oct 2026, 17:16 UTC

Severity

Unrated

Rated by Threat Radar · CVSS not yet scored by NVD

EPSS: 0.2% chance of exploitation in 30 days – higher than 11% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in 379cf06e6fe34af980064c6ccaf15d8e26ec4a42, 373f3716a2de7adc739269ebb4d87e5bf4dc180c, 68c1d2c085f205e8a5338bc3d3304f897deca4d9 +2

Exploitation evidence

Disclosed: evidence found.
CVE published 17 Sep 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: 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 26 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.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, 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.

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, < 6b15fc9bc117fb6597fa1c2cc30284aafe71101c	Fixed in 6b15fc9bc117fb6597fa1c2cc30284aafe71101c
LinuxLinux	Affected ≥ 0f8ab0b6e91b4d5302ceee5ec12ce54d81297635, < 2fcd26f4680143e9ec477069530548dbe20fce6f	Fixed in 2fcd26f4680143e9ec477069530548dbe20fce6f
LinuxLinux	Affected =4.8	Fixed in–

Description

In the Linux kernel, the following vulnerability has been resolved: RDMA/cxgb4: Fix dereg_skb leak and double free in write_tpt_entry() When the device is in the fatal error state, write_tpt_entry() returns -EIO before handing the caller's preallocated skb to the transmit path; its allocation-failure returns do the same. c4iw_dereg_mr() ignores the error and frees mhp, leaking mhp->dereg_skb. c4iw_get_dma_mr() instead frees the skb a second time after dereg_mem() already consumed it, a double free. Make write_tpt_entry() the sole owner of a non-NULL skb, freeing it on every return preceding handoff to c4iw_ofld_send(): fatal error, tpt and stag allocation failure. c4iw_ofld_send() consumes the skb on success and error alike, so drop the redundant kfree_skb() in c4iw_get_dma_mr() after dereg_mem().

References

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