CVE-2026-90125: Linux kernel · smb: client: fix request buffer leak in smb2_new_read_req()
Affects Linux kernelSource CVE Database V5
Not known to be exploited · fixed in deb6468f4164640e4dc875f008aa449cf55987a5 : update Linux kernel when convenient.
Data as of 30 Oct 2026, 13:03 UTC
Rated Medium by Threat Radar's AI analysis · CVSS not yet scored by NVD
Thin evidence
One scorer or none- Patch
- Available – fixed in deb6468f4164640e4dc875f008aa449cf55987a5, 58066940076b90c16e821fd6f9767cd979cbdb5e, 12092ed28434bf41e08d41e3c5269eb6b337fc02 +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.
What to do
Upgrade to a fixed release listed under Affected software.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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AI-suggested
A fix for this vulnerability has been implemented in the Linux kernel as indicated by multiple fixed commits. Users should update to a Linux kernel version that includes these fixes. No additional mitigation steps are required beyond applying the official patch.
Description
A buffer leak vulnerability exists in the Linux kernel's SMB client implementation in the smb2_new_read_req() function. The function allocates a request buffer but can return early on certain errors without releasing the buffer, causing a memory leak. This issue affects only the asynchronous SMB2 read path and can lead to repeated buffer leaks on retry attempts.
References
- git.kernel.org/stable/c/38daae149c2102d96833cc6acd79c8f98fcce208 (opens in a new tab)
- git.kernel.org/stable/c/58066940076b90c16e821fd6f9767cd979cbdb5e (opens in a new tab)
- git.kernel.org/stable/c/12092ed28434bf41e08d41e3c5269eb6b337fc02 (opens in a new tab)
- git.kernel.org/stable/c/442c5f1358ced0d4e716778ac06f1e323a7e4f21 (opens in a new tab)
- git.kernel.org/stable/c/73f6bdb0380486ab37fe12cd74de20abfaf5d3ae (opens in a new tab)
- git.kernel.org/stable/c/deb6468f4164640e4dc875f008aa449cf55987a5 (opens in a new tab)