HighFix available
SUNRPC: svcauth_gss: avoid NULL deref on zero length gss_token in gss_read_proxy_verf
Type: advisorySources: OSV
In the Linux kernel, the following vulnerability has been resolved: SUNRPC: svcauth_gss: avoid NULL deref on zero length gss_token in gss_read_proxy_verf A zero length gss_token results in pages == 0 and in_token->pages[0] is NULL. The code unconditionally evaluates page_address(in_token->pages[0]) for the initial memcpy, which can dereference NULL even when the copy length is 0. Guard the first memcpy so it only runs when length > 0.
- Products
- Kernel
- Affected versions
- Not specified
- Fixed versions
- 5.10.248, 5.15.198, 6.1.160, 6.12.64, 6.18.3, 6.6.120
- CVEs
- CVE-2025-71120
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 4 Nov 2026, 02:25 UTC · Revision 1
Source evidence
SUNRPC: svcauth_gss: avoid NULL deref on zero length gss_token in gss_read_proxy_verf
core-osv · Original sourcePublished 14 Jan 2026, 15:06 UTC
In the Linux kernel, the following vulnerability has been resolved: SUNRPC: svcauth_gss: avoid NULL deref on zero length gss_token in gss_read_proxy_verf A zero length gss_token results in pages == 0 and in_token->pages[0] is NULL. The code unconditionally evaluates page_address(in_token->pages[0]) for the initial memcpy, which can dereference NULL even when the copy length is 0. Guard the first memcpy so it only runs when length > 0.
osv:CVE-2025-71120
Kernel
Fixed versions: 5.10.248, 5.15.198, 6.1.160, 6.6.120, 6.12.64, 6.18.3
Complete source record
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"title": "SUNRPC: svcauth_gss: avoid NULL deref on zero length gss_token in gss_read_proxy_verf",
"summary": "In the Linux kernel, the following vulnerability has been resolved: SUNRPC: svcauth_gss: avoid NULL deref on zero length gss_token in gss_read_proxy_verf A zero length gss_token results in pages == 0 and in_token->pages[0] is NULL. The code unconditionally evaluates page_address(in_token->pages[0]) for the initial memcpy, which can dereference NULL even when the copy length is 0. Guard the first memcpy so it only runs when length > 0.",
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"modified": "2026-10-28T02:30:32.443662784Z",
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}
},
"related_cves": [
{
"value": "CVE-2025-71120",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 499676,
"published_at": "2026-01-14T15:06:07.194+00:00"
}