CVE-2026-45870: Linux kernel · SUNRPC: auth_gss: fix memory leaks in XDR decoding error paths
Affects Linux kernelSource CVE Database V5
Not known to be exploited · fixed in df10f23defff22c8d55fe6db74f6e4ce927145bf : update Linux kernel when convenient.
Data as of 6 Nov 2026, 16:06 UTC
Rated Low by Threat Radar's AI analysis · No CVSS score from NVD or the CNA
Thin evidence
One scorer or none- CISA SSVC
- Exploitation
- No evidence of active exploitation and no public proof of concept
- Automatable
- Attackers cannot reliably automate steps 1–4 of the kill chain
- Technical impact
- Limited control over the software or limited information exposure
CISA SSVC assessment, 2026-11-06.
- Patch
- Available – fixed in df10f23defff22c8d55fe6db74f6e4ce927145bf, d79b9097a6a2b91471b40755f1225364be5d85ff, caf7eff432e91a9eba1c79fa545c2f54be15d62b +5
Exploitation evidence
Disclosed: evidence found.
CVE published 27 May 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 6 Nov 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 is available and has been applied in the Linux kernel. Users should update to a fixed kernel version incorporating the patches identified by the commit hashes provided. No additional mitigation steps are required beyond applying the official fix.
Description
A memory leak vulnerability in the Linux kernel's SUNRPC auth_gss module was fixed. The issue occurs in the XDR decoding error paths where allocated memory buffers are not freed upon failure, leading to leaks. This affects functions gssx_dec_ctx(), gssx_dec_status(), and gssx_dec_name(). The leak in gssx_dec_ctx() is significant due to multiple buffer allocations that may remain unreleased if decoding fails partway.
References
- git.kernel.org/stable/c/c81431b1b9fbd21e9a5a9211b5517b7295d18e6a (opens in a new tab)
- git.kernel.org/stable/c/caf7eff432e91a9eba1c79fa545c2f54be15d62b (opens in a new tab)
- git.kernel.org/stable/c/64303b92d94c0c7845a273acd8d84b796d6f1db7 (opens in a new tab)
- git.kernel.org/stable/c/df10f23defff22c8d55fe6db74f6e4ce927145bf (opens in a new tab)
- git.kernel.org/stable/c/b4af3806846778799cd4ab0766dc18341e777264 (opens in a new tab)
- git.kernel.org/stable/c/d79b9097a6a2b91471b40755f1225364be5d85ff (opens in a new tab)
- git.kernel.org/stable/c/3b56eb90feb8a3709417f5624f3871847d42bcb1 (opens in a new tab)
- git.kernel.org/stable/c/3e6397b056335cc56ef0e9da36c95946a19f5118 (opens in a new tab)