SUNRPC: svcauth_gss: avoid NULL deref on zero length gss_token in gss_read_proxy_verf
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.
- BDU:2026-03365
- SUSE-SU-2026:1180-1
- SUSE-SU-2026:1185-1
- SUSE-SU-2026:1188-1
- SUSE-SU-2026:1189-1
- SUSE-SU-2026:1212-1
- SUSE-SU-2026:1221-1
- SUSE-SU-2026:1222-1
- SUSE-SU-2026:1225-1
- SUSE-SU-2026:1236-1
- SUSE-SU-2026:1237-1
- SUSE-SU-2026:1239-1
- SUSE-SU-2026:1242-1
- SUSE-SU-2026:1244-1
- SUSE-SU-2026:1248-1
- SUSE-SU-2026:1254-1
- SUSE-SU-2026:1259-1
- SUSE-SU-2026:1261-1
- SUSE-SU-2026:1263-1
- SUSE-SU-2026:1265-1
- Published
- Jan 14, 2026
- Updated
- Sep 8, 2026
- EPSS
- 0.5% · 39th percentile
- CWE
- CWE-476
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Report tools
Action score
22
Monitor
Low priority for now.
- CVSS
- 22 / 40 · 5.5 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 0.5%
CISA SSVC decision
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
Vulnrichment: CISA's decision-tree inputs.
CNA vs NVD score
- NVD
- 5.5
- CNA · Linux
- 7.5
- 2.0 point gap
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.
Noroxi analysis
No Noroxi analysis for this record yet
We don't hand-write analysis for the hundreds of thousands of vulnerabilities in the database; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.
We use this product, ask for helpAffected systems
| Vendor | Product | CPE |
|---|---|---|
| linux | linux kernel | cpe:2.3:o:linux:linux_kernel |
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- linux linux kernel4.19.99 and later · before 4.20
- linux linux kernel5.4.15 and later · before 5.5
- linux linux kernel5.5.1 and later · before 5.10.248
- linux linux kernel5.11 and later · before 5.15.198
- linux linux kernel5.16 and later · before 6.1.160
- linux linux kernel6.2 and later · before 6.6.120
- linux linux kernel6.7 and later · before 6.12.64
- linux linux kernel6.13 and later · before 6.18.3
- linux linux kernel5.5
- linux linux kernel6.19
Versions reported by the vendor
Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.
Linux Linux
- 66ed7b413d31c6ff23901ac4443b1cc1af2f6113, 7be8c165dc81564705e8e0b72d398ef708f67eaa, 5.5affected
- 5866efa8cbfbadf3905072798e96652faf02dbe8 and later · before a8f1e445ce3545c90d69c9e8ff8f7821825fe810affected · git
- 5866efa8cbfbadf3905072798e96652faf02dbe8 and later · before 4dedb6a11243a5c9eb9dbb97bca3c98bd725e83daffected · git
- 5866efa8cbfbadf3905072798e96652faf02dbe8 and later · before f9e53f69ac3bc4ef568b08d3542edac02e83fefdaffected · git
- 5866efa8cbfbadf3905072798e96652faf02dbe8 and later · before 7452d53f293379e2c38cfa8ad0694aa46fc4788baffected · git
- 5866efa8cbfbadf3905072798e96652faf02dbe8 and later · before a2c6f25ab98b423f99ccd94874d655b8bcb01a19affected · git
- 5866efa8cbfbadf3905072798e96652faf02dbe8 and later · before 1c8bb965e9b0559ff0f5690615a527c30f651dd8affected · git
- 5866efa8cbfbadf3905072798e96652faf02dbe8 and later · before d4b69a6186b215d2dc1ebcab965ed88e8d41768daffected · git
- 4.19.99 and later · before 4.20affected · semver
- 5.4.15 and later · before 5.5affected · semver
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| Debian:12 | linux | before 6.1.162-1 | 6.1.162-1 |
| Debian:13 | linux | before 6.12.69-1 | 6.12.69-1 |
| Debian:14 | linux | before 6.18.3-1 | 6.18.3-1 |
| SUSE:Linux Enterprise Live Patching 12 SP5 | kgraft-patch-SLE12-SP5_Update_67 | before 15-2.1 | 15-2.1 |
| SUSE:Linux Enterprise Live Patching 12 SP5 | kgraft-patch-SLE12-SP5_Update_68 | before 13-2.1 | 13-2.1 |
| SUSE:Linux Enterprise Live Patching 12 SP5 | kgraft-patch-SLE12-SP5_Update_70 | before 12-2.1 | 12-2.1 |
| SUSE:Linux Enterprise Live Patching 12 SP5 | kgraft-patch-SLE12-SP5_Update_71 | before 9-2.1 | 9-2.1 |
| SUSE:Linux Enterprise Live Patching 12 SP5 | kgraft-patch-SLE12-SP5_Update_72 | before 8-2.1 | 8-2.1 |
| SUSE:Linux Enterprise Live Patching 12 SP5 | kgraft-patch-SLE12-SP5_Update_73 | before 6-2.1 | 6-2.1 |
| SUSE:Linux Enterprise Live Patching 12 SP5 | kgraft-patch-SLE12-SP5_Update_74 | before 4-2.1 | 4-2.1 |
| SUSE:Linux Enterprise Live Patching 12 SP5 | kgraft-patch-SLE12-SP5_Update_75 | before 4-2.1 | 4-2.1 |
| SUSE:Linux Enterprise Live Patching 12 SP5 | kgraft-patch-SLE12-SP5_Update_76 | before 4-2.1 | 4-2.1 |
| SUSE:Linux Enterprise Live Patching 15 SP4 | kernel-livepatch-SLE15-SP4_Update_37 | before 17-150400.2.1 | 17-150400.2.1 |
| SUSE:Linux Enterprise Live Patching 15 SP4 | kernel-livepatch-SLE15-SP4_Update_38 | before 16-150400.2.1 | 16-150400.2.1 |
| SUSE:Linux Enterprise Live Patching 15 SP4 | kernel-livepatch-SLE15-SP4_Update_41 | before 15-150400.2.1 | 15-150400.2.1 |
| SUSE:Linux Enterprise Live Patching 15 SP4 | kernel-livepatch-SLE15-SP4_Update_42 | before 14-150400.2.1 | 14-150400.2.1 |
| SUSE:Linux Enterprise Live Patching 15 SP4 | kernel-livepatch-SLE15-SP4_Update_43 | before 11-150400.2.1 | 11-150400.2.1 |
| SUSE:Linux Enterprise Live Patching 15 SP4 | kernel-livepatch-SLE15-SP4_Update_44 | before 10-150400.2.1 | 10-150400.2.1 |
| SUSE:Linux Enterprise Live Patching 15 SP4 | kernel-livepatch-SLE15-SP4_Update_45 | before 8-150400.2.1 | 8-150400.2.1 |
| SUSE:Linux Enterprise Live Patching 15 SP4 | kernel-livepatch-SLE15-SP4_Update_46 | before 4-150400.2.1 | 4-150400.2.1 |
| SUSE:Linux Enterprise Live Patching 15 SP4 | kernel-livepatch-SLE15-SP4_Update_47 | before 4-150400.2.1 | 4-150400.2.1 |
| SUSE:Linux Enterprise Live Patching 15 SP5 | kernel-livepatch-SLE15-SP5_Update_26 | before 16-150500.2.1 | 16-150500.2.1 |
| SUSE:Linux Enterprise Live Patching 15 SP5 | kernel-livepatch-SLE15-SP5_Update_27 | before 15-150500.2.1 | 15-150500.2.1 |
| SUSE:Linux Enterprise Live Patching 15 SP5 | kernel-livepatch-SLE15-SP5_Update_28 | before 14-150500.2.1 | 14-150500.2.1 |
+54
Same product
linux: all recordsOther highest-scoring records for the same primary product.
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- CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV85Now
- CVE-2016-5195Race condition in mm/gup.c in the Linux kernel 2.x through 4.x before 4.8.3 allows local users to gain privileges by leveraging incorrect haKEV83Now
- CVE-2019-13272In the Linux kernel before 5.1.17, ptrace_link in kernel/ptrace.c mishandles the recording of the credentials of a process that wants to creKEV77This week
- CVE-2013-6282The (1) get_user and (2) put_user API functions in the Linux kernel before 3.5.5 on the v6k and v7 ARM platforms do not validate certain addKEV77This week
- CVE-2013-2094The perf_swevent_init function in kernel/events/core.c in the Linux kernel before 3.8.9 uses an incorrect integer data type, which allows loKEV77This week
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| Linux Linux | 1c8bb965e9b0559ff0f5690615a527c30f651dd8 | Vendor (CNA) |
| Linux Linux | 4.20 | Vendor (CNA) |
| Linux Linux | 4dedb6a11243a5c9eb9dbb97bca3c98bd725e83d | Vendor (CNA) |
| Linux Linux | 5.5 | Vendor (CNA) |
| Linux Linux | 7452d53f293379e2c38cfa8ad0694aa46fc4788b | Vendor (CNA) |
| Linux Linux | a2c6f25ab98b423f99ccd94874d655b8bcb01a19 | Vendor (CNA) |
| Linux Linux | a8f1e445ce3545c90d69c9e8ff8f7821825fe810 | Vendor (CNA) |
| Linux Linux | d4b69a6186b215d2dc1ebcab965ed88e8d41768d | Vendor (CNA) |
| Linux Linux | f9e53f69ac3bc4ef568b08d3542edac02e83fefd | Vendor (CNA) |
| azl3 kernel 6.6.119.3-3 on Azure Linux 3.0 | 6.6.121.1-1 · CBL-Mariner Releases | Microsoft (MSRC) |
| debian:linux | 6.1.162-1 · Debian:12 | Package registry (OSV) |
| suse:kernel-livepatch-SLE15-SP4_Update_43 | 11-150400.2.1 · SUSE:Linux Enterprise Live Patching 15 SP4 | Package registry (OSV) |
| suse:kernel-livepatch-SLE15-SP4_Update_44 | 10-150400.2.1 · SUSE:Linux Enterprise Live Patching 15 SP4 | Package registry (OSV) |
| suse:kernel-livepatch-SLE15-SP4_Update_47 | 4-150400.2.1 · SUSE:Linux Enterprise Live Patching 15 SP4 | Package registry (OSV) |
| suse:kernel-livepatch-SLE15-SP5_Update_30 | 9-150500.2.1 · SUSE:Linux Enterprise Live Patching 15 SP5 | Package registry (OSV) |
| suse:kernel-livepatch-SLE15-SP5_Update_31 | 7-150500.2.1 · SUSE:Linux Enterprise Live Patching 15 SP5 | Package registry (OSV) |
| suse:kernel-livepatch-SLE15-SP6_Update_12 | 14-150600.2.1 · SUSE:Linux Enterprise Live Patching 15 SP6 | Package registry (OSV) |
| suse:kernel-livepatch-SLE15-SP6_Update_16 | 5-150600.2.1 · SUSE:Linux Enterprise Live Patching 15 SP6 | Package registry (OSV) |
| suse:kernel-livepatch-SLE15-SP7-RT_Update_1 | 13-150700.2.1 · SUSE:Linux Enterprise Live Patching 15 SP7 | Package registry (OSV) |
| suse:kernel-livepatch-SLE15-SP7-RT_Update_5 | 5-150700.2.1 · SUSE:Linux Enterprise Live Patching 15 SP7 | Package registry (OSV) |
| suse:kernel-livepatch-SLE15-SP7-RT_Update_6 | 4-150700.2.1 · SUSE:Linux Enterprise Live Patching 15 SP7 | Package registry (OSV) |
| suse:kernel-livepatch-SLE15-SP7-RT_Update_8 | 3-150700.2.1 · SUSE:Linux Enterprise Live Patching 15 SP7 | Package registry (OSV) |
| suse:kgraft-patch-SLE12-SP5_Update_67 | 15-2.1 · SUSE:Linux Enterprise Live Patching 12 SP5 | Package registry (OSV) |
Exploit status
No known public exploit
No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.
Research context
For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.
Timeline
From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.
No dated events beyond publication.
FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).
Patch and commit links
Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.
No commit or PR link among the references.
Credits
All researchersFinders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.
No credits in the CNA record.
Variant candidates
Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.
No nightly-computed relations.
Chain candidates
An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.
—
Bug bounty scope
No known public program.
Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).
Technical details
Attack conditions
- Someone with local access to the system can trigger it.
- A low-privileged account is enough.
- No user action is required.
- No special conditions are required; it is repeatable.
If successful
- Confidentiality
- none
- Integrity
- none
- Availability
- high · the service can be disrupted
- Attack vector
- Local
- Attack complexity
- Low
- Privileges required
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- None
- Integrity impact
- None
- Availability impact
- High
Weakness class (CWE)
CWE-476 · NULL Pointer DereferenceCVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
nvd-primary
Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
MITRE has no CAPEC/ATT&CK mapping for this CWE.
Change log
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
- git.kernel.org/stable/c/1c8bb965e9b0559ff0f5690615a527c30f651dd8
- git.kernel.org/stable/c/4dedb6a11243a5c9eb9dbb97bca3c98bd725e83d
- git.kernel.org/stable/c/7452d53f293379e2c38cfa8ad0694aa46fc4788b
- git.kernel.org/stable/c/a2c6f25ab98b423f99ccd94874d655b8bcb01a19
- git.kernel.org/stable/c/a8f1e445ce3545c90d69c9e8ff8f7821825fe810
- git.kernel.org/stable/c/d4b69a6186b215d2dc1ebcab965ed88e8d41768d
- git.kernel.org/stable/c/f9e53f69ac3bc4ef568b08d3542edac02e83fefd
- cert-portal.siemens.com/productcert/html/ssa-019113.html
Vendor advisories and official records. Exploit/PoC links are deliberately left out.