CVE-2026-43502: net/rds: handle zerocopy send cleanup before the message is queued
Noroxi assessment
Priority: Monitor (action score 31/100)
- The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
- Probability of exploitation in the next 30 days: 0.32% (FIRST EPSS).
- 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.
- Fixed version: Linux Linux 0f5c185fc79a59ee9991234dd6d2a3e5afa6e75b, 14ef6fd18db2494098b21e0471bf27a1d8e9993e, 1e262db7675e27f42c3f3f47d6011855f4454f24; azl3 kernel 6.6.139.1-1 on Azure Linux 3.0 6.6.141.1-1.
Low priority for now. Upgrade to Linux Linux 0f5c185fc79a59ee9991234dd6d2a3e5afa6e75b, 14ef6fd18db2494098b21e0471bf27a1d8e9993e, 1e262db7675e27f42c3f3f47d6011855f4454f24; azl3 kernel 6.6.139.1-1 on Azure Linux 3.0 6.6.141.1-1 or later.
Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it
Primary sources: NVD · CVE.org · FIRST EPSS
In the Linux kernel, the following vulnerability has been resolved: net/rds: handle zerocopy send cleanup before the message is queued A zerocopy send can fail after user pages have been pinned but before the message is attached to the sending socket. The purge path currently infers zerocopy state from rm->m_rs, so an unqueued message can be cleaned up as if it owned normal payload pages. However, zerocopy ownership is really determined by the presence of op_mmp_znotifier, regardless of whether the message has reached the socket queue. Capture op_mmp_znotifier up front in rds_message_purge() and use it as the cleanup discriminator. If the message is already associated with a socket, keep the existing completion path. Otherwise, drop the pinned page accounting directly and release the notifier before putting the payload pages. This keeps early send failure cleanup consistent with the zerocopy lifetime rules without changing the normal queued completion path.
- Published
- May 21, 2026
- Updated
- Oct 15, 2026
- EPSS
- 0.3% · 25th percentile
- CWE
- CWE-401
Report tools
Action score
31
Monitor
Low priority for now.
- CVSS
- 31 / 40 · 7.8 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 0.3%
CISA SSVC decision
- Exploitation
- proof of concept
- Automatable
- no
- Technical impact
- total
Vulnrichment: CISA's decision-tree inputs.
CNA vs NVD score
- NVD
- —
- CNA · Linux
- 7.8
- NVD has not scored this yet; the score shown is the CNA’s.
The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.
Get told when this record changes
- Not in KEV: no record of exploitation in the wild
- No public exploit code on record
- A fix has been released
If any of these changes, we'll tell you in the daily email digest.
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Noroxi analysis
What does it mean in your environment?
The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.
We use this product, ask for helpAffected systems
Is your version affected?
Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.
| 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 kernel4.17 and later · before 5.10.258
- linux linux kernel5.11 and later · before 5.15.209
- linux linux kernel5.16 and later · before 6.1.175
- linux linux kernel6.2 and later · before 6.6.140
- linux linux kernel6.7 and later · before 6.12.88
- linux linux kernel6.13 and later · before 6.18.30
- linux linux kernel6.19 and later · before 7.0.7
- linux linux kernel7.1
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
- 4.17affected
- 0cebaccef3acbdfbc2d85880a2efb765d2f4e2e3 and later · before e9aefdc5c53fe9aed108c14e3d155710a1bb14c9affected · git
- 0cebaccef3acbdfbc2d85880a2efb765d2f4e2e3 and later · before 46662f7dc59475995609bf3e9d27eb36f4acf26faffected · git
- 0cebaccef3acbdfbc2d85880a2efb765d2f4e2e3 and later · before 1e262db7675e27f42c3f3f47d6011855f4454f24affected · git
- 0cebaccef3acbdfbc2d85880a2efb765d2f4e2e3 and later · before 21d70744e6d3bbf9293aa1ee6fba7c53ad75275eaffected · git
- 0cebaccef3acbdfbc2d85880a2efb765d2f4e2e3 and later · before 3abc8983b2bae3f487f77d9da5527d7d6b210d46affected · git
- 0cebaccef3acbdfbc2d85880a2efb765d2f4e2e3 and later · before 14ef6fd18db2494098b21e0471bf27a1d8e9993eaffected · git
- 0cebaccef3acbdfbc2d85880a2efb765d2f4e2e3 and later · before 0f5c185fc79a59ee9991234dd6d2a3e5afa6e75baffected · git
- 0cebaccef3acbdfbc2d85880a2efb765d2f4e2e3 and later · before 44b550d88b267320459d518c0743a241ab2108faaffected · git
- before 4.17not affected · 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 6.1.176-1 | 6.1.176-1 |
| Debian:13 | linux | before 6.12.88-1 | 6.12.88-1 |
| Debian:14 | linux | before 7.0.7-1 | 7.0.7-1 |
| openSUSE:Tumbleweed | kernel-source | before 7.0.10-1.1 | 7.0.10-1.1 |
| SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS | kernel-64kb | before 5.14.21-150400.24.240.2 | 5.14.21-150400.24.240.2 |
| SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS | kernel-docs | before 5.14.21-150400.24.240.1 | 5.14.21-150400.24.240.1 |
| SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS | kernel-obs-build | before 5.14.21-150400.24.240.1 | 5.14.21-150400.24.240.1 |
| SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS | kernel-syms | before 5.14.21-150400.24.240.1 | 5.14.21-150400.24.240.1 |
| SUSE:Linux Enterprise High Performance Computing 15 SP5-ESPOS | kernel-64kb | before 5.14.21-150500.55.192.2 | 5.14.21-150500.55.192.2 |
| SUSE:Linux Enterprise High Performance Computing 15 SP5-ESPOS | kernel-docs | before 5.14.21-150500.55.192.1 | 5.14.21-150500.55.192.1 |
| SUSE:Linux Enterprise High Performance Computing 15 SP5-ESPOS | kernel-obs-build | before 5.14.21-150500.55.192.2 | 5.14.21-150500.55.192.2 |
| SUSE:Linux Enterprise High Performance Computing 15 SP5-ESPOS | kernel-syms | before 5.14.21-150500.55.192.1 | 5.14.21-150500.55.192.1 |
| SUSE:Linux Enterprise Live Patching 15 SP4 | kernel-livepatch-SLE15-SP4_Update_59 | before 1-150400.9.5.1 | 1-150400.9.5.1 |
| SUSE:Linux Enterprise Live Patching 15 SP5 | kernel-livepatch-SLE15-SP5_Update_46 | before 1-150500.11.3.2 | 1-150500.11.3.2 |
| SUSE:Linux Enterprise Live Patching 15 SP6 | kernel-default | before 6.4.0-150600.23.138.1 | 6.4.0-150600.23.138.1 |
| SUSE:Linux Enterprise Live Patching 15 SP6 | kernel-livepatch-SLE15-SP6_Update_32 | before 1-150600.13.3.1 | 1-150600.13.3.1 |
| SUSE:Linux Enterprise Micro 5.3 | kernel-default | before 5.14.21-150400.24.240.2 | 5.14.21-150400.24.240.2 |
| SUSE:Linux Enterprise Micro 5.3 | kernel-default-base | before 5.14.21-150400.24.240.2.150400.24.120.2 | 5.14.21-150400.24.240.2.150400.24.120.2 |
| SUSE:Linux Enterprise Micro 5.3 | kernel-rt | before 5.14.21-150400.15.186.1 | 5.14.21-150400.15.186.1 |
| SUSE:Linux Enterprise Micro 5.3 | kernel-source | before 5.14.21-150400.24.240.1 | 5.14.21-150400.24.240.1 |
| SUSE:Linux Enterprise Micro 5.3 | kernel-source-rt | before 5.14.21-150400.15.186.1 | 5.14.21-150400.15.186.1 |
| SUSE:Linux Enterprise Micro 5.5 | kernel-default | before 5.14.21-150500.55.192.2 | 5.14.21-150500.55.192.2 |
| SUSE:Linux Enterprise Micro 5.5 | kernel-default-base | before 5.14.21-150500.55.192.2.150500.6.89.2 | 5.14.21-150500.55.192.2.150500.6.89.2 |
| SUSE:Linux Enterprise Micro 5.5 | kernel-rt | before 5.14.21-150500.13.164.1 | 5.14.21-150500.13.164.1 |
+14
Same product
linux: all recordsOther highest-scoring records for the same primary product.
- CVE-2026-31431crypto: algif_aead - Revert to operating out-of-placeKEV90Now
- CVE-2022-0847A flaw was found in the way the "flags" member of the new pipe buffer structure was lacking proper initialization in copy_page_to_iter_pipe KEV89Now
- CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV85Now
Published before and after this one in the same product
- ← EarlierCVE-2026-43499May 21, 2026 · rtmutex: Use waiter::task instead of current in remove_waiter()31Monitor
- ← EarlierCVE-2026-43501May 21, 2026 · ipv6: rpl: reserve mac_len headroom when recompressed SRH grows39Monitor
- Later →CVE-2026-43503May 23, 2026 · net: skbuff: propagate shared-frag marker through frag-transfer helpers40Plan
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 | 0f5c185fc79a59ee9991234dd6d2a3e5afa6e75b | Vendor (CNA) |
| Linux Linux | 14ef6fd18db2494098b21e0471bf27a1d8e9993e | Vendor (CNA) |
| Linux Linux | 1e262db7675e27f42c3f3f47d6011855f4454f24 | Vendor (CNA) |
| Linux Linux | 21d70744e6d3bbf9293aa1ee6fba7c53ad75275e | Vendor (CNA) |
| Linux Linux | 3abc8983b2bae3f487f77d9da5527d7d6b210d46 | Vendor (CNA) |
| Linux Linux | 44b550d88b267320459d518c0743a241ab2108fa | Vendor (CNA) |
| Linux Linux | 46662f7dc59475995609bf3e9d27eb36f4acf26f | Vendor (CNA) |
| Linux Linux | e9aefdc5c53fe9aed108c14e3d155710a1bb14c9 | Vendor (CNA) |
| azl3 kernel 6.6.139.1-1 on Azure Linux 3.0 | 6.6.141.1-1 · CBL-Mariner Releases | Microsoft (MSRC) |
| debian:linux | 6.1.176-1 · Debian:12 | Package registry (OSV) |
| opensuse:kernel-source | 7.0.10-1.1 · openSUSE:Tumbleweed | Package registry (OSV) |
| suse:kernel-64kb | 5.14.21-150400.24.240.2 · SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS | Package registry (OSV) |
| suse:kernel-default | 5.14.21-150400.24.240.2 · SUSE:Linux Enterprise Micro 5.3 | Package registry (OSV) |
| suse:kernel-default-base | 5.14.21-150400.24.240.2.150400.24.120.2 · SUSE:Linux Enterprise Micro 5.3 | Package registry (OSV) |
| suse:kernel-docs | 5.14.21-150400.24.240.1 · SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS | Package registry (OSV) |
| suse:kernel-livepatch-SLE15-SP4_Update_59 | 1-150400.9.5.1 · SUSE:Linux Enterprise Live Patching 15 SP4 | Package registry (OSV) |
| suse:kernel-livepatch-SLE15-SP6_Update_32 | 1-150600.13.3.1 · SUSE:Linux Enterprise Live Patching 15 SP6 | Package registry (OSV) |
| suse:kernel-obs-build | 5.14.21-150400.24.240.1 · SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS | Package registry (OSV) |
| suse:kernel-rt | 5.14.21-150400.15.186.1 · SUSE:Linux Enterprise Micro 5.3 | Package registry (OSV) |
| suse:kernel-rt | 6.4.0-159998.53.1 · SUSE:Linux Micro 6.1 | Package registry (OSV) |
| suse:kernel-source | 5.14.21-150400.24.240.1 · SUSE:Linux Enterprise Micro 5.3 | Package registry (OSV) |
| suse:kernel-source-rt | 5.14.21-150400.15.186.1 · SUSE:Linux Enterprise Micro 5.3 | Package registry (OSV) |
| suse:kernel-source-rt | 6.4.0-159998.53.1 · SUSE:Linux Micro 6.1 | Package registry (OSV) |
| suse:kernel-syms | 5.14.21-150400.24.240.1 · SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS | Package registry (OSV) |
| suse:kernel-zfcpdump | 5.14.21-150400.24.240.2 · SUSE:Linux Enterprise Server 15 SP4-LTSS | Package registry (OSV) |
| suse:podman | 5.4.2-160000.6.1 · SUSE:Linux Micro 6.2 | 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.
No history yet (it accumulates with the daily EPSS job).
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
- high · data can be read
- Integrity
- high · data or configuration can be modified
- Availability
- high · the service can be disrupted
- Attack vector
- Local
- Attack complexity
- Low
- Privileges required
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- High
- Integrity impact
- High
- Availability impact
- High
Weakness class (CWE)
CWE-401 · Missing Release of Memory after Effective LifetimeCVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
nvd-secondary
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
Show all references (9 more)Show less
- git.kernel.org/stable/c/14ef6fd18db2494098b21e0471bf27a1d8e9993e
- git.kernel.org/stable/c/1e262db7675e27f42c3f3f47d6011855f4454f24
- git.kernel.org/stable/c/21d70744e6d3bbf9293aa1ee6fba7c53ad75275e
- git.kernel.org/stable/c/3abc8983b2bae3f487f77d9da5527d7d6b210d46
- git.kernel.org/stable/c/44b550d88b267320459d518c0743a241ab2108fa
- git.kernel.org/stable/c/46662f7dc59475995609bf3e9d27eb36f4acf26f
- git.kernel.org/stable/c/e9aefdc5c53fe9aed108c14e3d155710a1bb14c9
- cert-portal.siemens.com/productcert/html/ssa-784472.html
- github.com/NebuSec/CyberMeowfia/tree/main/security-research/Linux-CVE-2026-43502-openSUSE-6.4.0-150600
Vendor advisories and official records. Exploit/PoC links are deliberately left out.