CVE-2026-46189: RDMA/vmw_pvrdma: Fix double free on pvrdma_alloc_ucontext() error path
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: 0.14% (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 0c63333ff97bd1275294fd12840a0efe9d7a4c59, 1df5711121cdc11e76b889408fdbe459feba1d39, 269967d7693304e1f06ed2dff4ebbbeeb397cda4; azl3 kernel 6.6.139.1-1 on Azure Linux 3.0 6.6.141.1-1.
- Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).
Low priority for now. Upgrade to Linux Linux 0c63333ff97bd1275294fd12840a0efe9d7a4c59, 1df5711121cdc11e76b889408fdbe459feba1d39, 269967d7693304e1f06ed2dff4ebbbeeb397cda4; 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: RDMA/vmw_pvrdma: Fix double free on pvrdma_alloc_ucontext() error path Sashiko points out that pvrdma_uar_free() is already called within pvrdma_dealloc_ucontext(), so calling it before triggers a double free.
- ALSA-2026:30848
- ALSA-2026:33685
- ALSA-2026:33743
- ALSA-2026:36049
- RHSA-2026:30848
- RHSA-2026:33685
- RHSA-2026:33743
- RHSA-2026:35904
- RHSA-2026:36049
- RHSA-2026:36073
- RHSA-2026:36767
- RHSA-2026:38902
- RHSA-2026:40068
- RHSA-2026:40760
- RHSA-2026:47633
- RHSA-2026:72627
- RHSA-2026:72628
- RHSA-2026:72629
- RHSA-2026:72630
- RHSA-2026:72830
- Published
- May 28, 2026
- Updated
- Sep 9, 2026
- EPSS
- 0.1% · 3th percentile
- CWE
- CWE-415
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 · 0.1%
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 kernel4.10 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
- 4.10affected
- 29c8d9eba550c6d73d17cc1618a9f5f2a7345aa1 and later · before 269967d7693304e1f06ed2dff4ebbbeeb397cda4affected · git
- 29c8d9eba550c6d73d17cc1618a9f5f2a7345aa1 and later · before 1df5711121cdc11e76b889408fdbe459feba1d39affected · git
- 29c8d9eba550c6d73d17cc1618a9f5f2a7345aa1 and later · before 3a231c34c5bc3d3cfc850b877758ec9fdaa8a483affected · git
- 29c8d9eba550c6d73d17cc1618a9f5f2a7345aa1 and later · before ecc36a82ecfcfdf3c6606d209f22ec5543c410e0affected · git
- 29c8d9eba550c6d73d17cc1618a9f5f2a7345aa1 and later · before 45d25e3ec17900bf5a9d6876ff16ceee31c4c0e0affected · git
- 29c8d9eba550c6d73d17cc1618a9f5f2a7345aa1 and later · before 0c63333ff97bd1275294fd12840a0efe9d7a4c59affected · git
- 29c8d9eba550c6d73d17cc1618a9f5f2a7345aa1 and later · before 935ee27d0904aa944cbcc979094c20e5ef62eeadaffected · git
- 29c8d9eba550c6d73d17cc1618a9f5f2a7345aa1 and later · before e38e86995df27f1f854063dab1f0c6a513db3fafaffected · git
- before 4.10not affected · semver
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| AlmaLinux:10 | kernel | before 6.12.0-211.29.1.el10_2 | 6.12.0-211.29.1.el10_2 |
| AlmaLinux:10 | kernel-64k | before 6.12.0-211.29.1.el10_2 | 6.12.0-211.29.1.el10_2 |
| AlmaLinux:10 | kernel-64k-core | before 6.12.0-211.29.1.el10_2 | 6.12.0-211.29.1.el10_2 |
| AlmaLinux:10 | kernel-64k-debug | before 6.12.0-211.29.1.el10_2 | 6.12.0-211.29.1.el10_2 |
| AlmaLinux:10 | kernel-64k-debug-core | before 6.12.0-211.29.1.el10_2 | 6.12.0-211.29.1.el10_2 |
| AlmaLinux:10 | kernel-64k-debug-devel | before 6.12.0-211.29.1.el10_2 | 6.12.0-211.29.1.el10_2 |
| AlmaLinux:10 | kernel-64k-debug-devel-matched | before 6.12.0-211.29.1.el10_2 | 6.12.0-211.29.1.el10_2 |
| AlmaLinux:10 | kernel-64k-debug-modules | before 6.12.0-211.29.1.el10_2 | 6.12.0-211.29.1.el10_2 |
| AlmaLinux:10 | kernel-64k-debug-modules-core | before 6.12.0-211.29.1.el10_2 | 6.12.0-211.29.1.el10_2 |
| AlmaLinux:10 | kernel-64k-debug-modules-extra | before 6.12.0-211.29.1.el10_2 | 6.12.0-211.29.1.el10_2 |
| AlmaLinux:10 | kernel-64k-devel | before 6.12.0-211.29.1.el10_2 | 6.12.0-211.29.1.el10_2 |
| AlmaLinux:10 | kernel-64k-devel-matched | before 6.12.0-211.29.1.el10_2 | 6.12.0-211.29.1.el10_2 |
| AlmaLinux:10 | kernel-64k-modules | before 6.12.0-211.29.1.el10_2 | 6.12.0-211.29.1.el10_2 |
| AlmaLinux:10 | kernel-64k-modules-core | before 6.12.0-211.29.1.el10_2 | 6.12.0-211.29.1.el10_2 |
| AlmaLinux:10 | kernel-64k-modules-extra | before 6.12.0-211.29.1.el10_2 | 6.12.0-211.29.1.el10_2 |
| AlmaLinux:10 | kernel-abi-stablelists | before 6.12.0-211.29.1.el10_2 | 6.12.0-211.29.1.el10_2 |
| AlmaLinux:10 | kernel-core | before 6.12.0-211.29.1.el10_2 | 6.12.0-211.29.1.el10_2 |
| AlmaLinux:10 | kernel-cross-headers | before 6.12.0-211.29.1.el10_2 | 6.12.0-211.29.1.el10_2 |
| AlmaLinux:10 | kernel-debug | before 6.12.0-211.29.1.el10_2 | 6.12.0-211.29.1.el10_2 |
| AlmaLinux:10 | kernel-debug-core | before 6.12.0-211.29.1.el10_2 | 6.12.0-211.29.1.el10_2 |
| AlmaLinux:10 | kernel-debug-devel | before 6.12.0-211.29.1.el10_2 | 6.12.0-211.29.1.el10_2 |
| AlmaLinux:10 | kernel-debug-devel-matched | before 6.12.0-211.29.1.el10_2 | 6.12.0-211.29.1.el10_2 |
| AlmaLinux:10 | kernel-debug-modules | before 6.12.0-211.29.1.el10_2 | 6.12.0-211.29.1.el10_2 |
| AlmaLinux:10 | kernel-debug-modules-core | before 6.12.0-211.29.1.el10_2 | 6.12.0-211.29.1.el10_2 |
+96
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-2026-46186May 28, 2026 · Bluetooth: virtio_bt: validate rx pkt_type header length22Monitor
- ← EarlierCVE-2026-46188May 28, 2026 · octeon_ep_vf: add NULL check for napi_build_skb()22Monitor
- Later →CVE-2026-46192May 28, 2026 · spi: microchip-core-qspi: don't attempt to transmit during emulated read-only dual/quad operations22Monitor
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 | 0c63333ff97bd1275294fd12840a0efe9d7a4c59 | Vendor (CNA) |
| Linux Linux | 1df5711121cdc11e76b889408fdbe459feba1d39 | Vendor (CNA) |
| Linux Linux | 269967d7693304e1f06ed2dff4ebbbeeb397cda4 | Vendor (CNA) |
| Linux Linux | 3a231c34c5bc3d3cfc850b877758ec9fdaa8a483 | Vendor (CNA) |
| Linux Linux | 45d25e3ec17900bf5a9d6876ff16ceee31c4c0e0 | Vendor (CNA) |
| Linux Linux | 935ee27d0904aa944cbcc979094c20e5ef62eead | Vendor (CNA) |
| Linux Linux | e38e86995df27f1f854063dab1f0c6a513db3faf | Vendor (CNA) |
| Linux Linux | ecc36a82ecfcfdf3c6606d209f22ec5543c410e0 | Vendor (CNA) |
| azl3 kernel 6.6.139.1-1 on Azure Linux 3.0 | 6.6.141.1-1 · CBL-Mariner Releases | Microsoft (MSRC) |
| almalinux:kernel | 5.14.0-687.19.1.el9_8 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:kernel-64k | 5.14.0-687.19.1.el9_8 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:kernel-64k-core | 5.14.0-687.19.1.el9_8 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:kernel-64k-debug | 5.14.0-687.19.1.el9_8 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:kernel-64k-debug-core | 5.14.0-687.19.1.el9_8 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:kernel-64k-debug-devel | 5.14.0-687.19.1.el9_8 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:kernel-64k-debug-devel-matched | 5.14.0-687.19.1.el9_8 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:kernel-64k-debug-modules | 5.14.0-687.19.1.el9_8 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:kernel-64k-debug-modules-core | 5.14.0-687.19.1.el9_8 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:kernel-64k-debug-modules-extra | 5.14.0-687.19.1.el9_8 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:kernel-64k-devel | 5.14.0-687.19.1.el9_8 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:kernel-64k-devel-matched | 5.14.0-687.19.1.el9_8 · AlmaLinux:9 | Package registry (OSV) |
| debian:linux | 6.1.176-1 · Debian:12 | Package registry (OSV) |
| red hat:kernel-64k-debug-debuginfo | 0:5.14.0-687.19.1.el9_8 · Red Hat:enterprise_linux:9::appstream | Package registry (OSV) |
| red hat:kernel-64k-debug-devel | 0:5.14.0-687.19.1.el9_8 · Red Hat:enterprise_linux:9::appstream | Package registry (OSV) |
| red hat:kernel-64k-debug-devel-matched | 0:5.14.0-687.19.1.el9_8 · Red Hat:enterprise_linux:9::appstream | Package registry (OSV) |
| red hat:kernel-64k-debuginfo | 0:5.14.0-687.19.1.el9_8 · Red Hat:enterprise_linux:9::appstream | Package registry (OSV) |
| red hat:kernel-64k-devel | 0:5.14.0-687.19.1.el9_8 · Red Hat:enterprise_linux:9::appstream | Package registry (OSV) |
| red hat:kernel-64k-devel-matched | 0:5.14.0-687.19.1.el9_8 · Red Hat:enterprise_linux:9::appstream | Package registry (OSV) |
| red hat:kernel-debug-debuginfo | 0:5.14.0-687.19.1.el9_8 · Red Hat:enterprise_linux:9::appstream | Package registry (OSV) |
| red hat:kernel-debug-devel | 0:5.14.0-687.19.1.el9_8 · Red Hat:enterprise_linux:9::appstream | Package registry (OSV) |
+4
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.
- CVE-2026-4341420 days apartscsi: qla2xxx: Completely fix fcport double free39Monitor
- CVE-2026-4301127 days apartnet/x25: Fix potential double free of skb39Monitor
- CVE-2026-5299327 days aparttipc: fix double-free in tipc_buf_append()39Monitor
- CVE-2026-3160834 days apartsmb: server: avoid double-free in smb_direct_free_sendmsg after smb_direct_flush_send_list()39Monitor
- CVE-2026-3160934 days apartsmb: client: avoid double-free in smbd_free_send_io() after smbd_send_batch_flush()39Monitor
- CVE-2026-6388852 days apartscsi: target: iscsi: Fix CRC overread and double-free in iscsit_handle_text_cmd()39Monitor
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).
National notice (Türkiye Cybersecurity Directorate / USOM)
Official security notices citing this record; remediation advice is on the agency's page.
- TR-26-0290 · Jun 2, 2026(Linux Kernel Güvenlik Bildirimi)
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-415 · Double FreeCVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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
Show all references (19 more)Show less
- git.kernel.org/stable/c/1df5711121cdc11e76b889408fdbe459feba1d39
- git.kernel.org/stable/c/269967d7693304e1f06ed2dff4ebbbeeb397cda4
- git.kernel.org/stable/c/3a231c34c5bc3d3cfc850b877758ec9fdaa8a483
- git.kernel.org/stable/c/45d25e3ec17900bf5a9d6876ff16ceee31c4c0e0
- git.kernel.org/stable/c/935ee27d0904aa944cbcc979094c20e5ef62eead
- git.kernel.org/stable/c/e38e86995df27f1f854063dab1f0c6a513db3faf
- git.kernel.org/stable/c/ecc36a82ecfcfdf3c6606d209f22ec5543c410e0
- access.redhat.com/errata/RHSA-2026:30848
- access.redhat.com/errata/RHSA-2026:33685
- access.redhat.com/errata/RHSA-2026:33743
- access.redhat.com/errata/RHSA-2026:35904
- access.redhat.com/errata/RHSA-2026:36049
- access.redhat.com/errata/RHSA-2026:36073
- access.redhat.com/errata/RHSA-2026:36767
- access.redhat.com/errata/RHSA-2026:38902
- access.redhat.com/errata/RHSA-2026:40068
- access.redhat.com/errata/RHSA-2026:40760
- access.redhat.com/errata/RHSA-2026:47633
- access.redhat.com/security/cve/CVE-2026-46189
Vendor advisories and official records. Exploit/PoC links are deliberately left out.