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NVD / CVE Program· CNA Linux

CVE-2026-43128: RDMA/umem: Fix double dma_buf_unpin in failure 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: 0.13% (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 104016eb671e19709721c1b0048dd912dc2e96be, 40126bcbefa79ea86672e05dae608596bab38319, 70542b69abff34d24b11ae0bb200cc7a766d18df.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 104016eb671e19709721c1b0048dd912dc2e96be, 40126bcbefa79ea86672e05dae608596bab38319, 70542b69abff34d24b11ae0bb200cc7a766d18df 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/umem: Fix double dma_buf_unpin in failure path In ib_umem_dmabuf_get_pinned_with_dma_device(), the call to ib_umem_dmabuf_map_pages() can fail. If this occurs, the dmabuf is immediately unpinned but the umem_dmabuf->pinned flag is still set. Then, when ib_umem_release() is called, it calls ib_umem_dmabuf_revoke() which will call dma_buf_unpin() again. Fix this by removing the immediate unpin upon failure and just let the ib_umem_release/revoke path handle it. This also ensures the proper unmap-unpin unwind ordering if the dmabuf_map_pages call happened to fail due to dma_resv_wait_timeout (and therefore has a non-NULL umem_dmabuf->sgt).

HighCVSS 7.8 · v3.1—No exploit Fix available
Published
May 6, 2026
Updated
Oct 19, 2026
EPSS
0.1% · 3th percentile

Report tools

JSON

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%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
7.8
CNA · Linux
7.8
agree

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

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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.

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Affected 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.

VendorProduct
linuxlinux kernel

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • linux linux kernel5.16 and later · before 6.1.165
  • linux linux kernel6.2 and later · before 6.6.128
  • linux linux kernel6.7 and later · before 6.12.75
  • linux linux kernel6.13 and later · before 6.18.16
  • linux linux kernel6.19 and later · before 6.19.6
  • linux linux kernel7.0

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

    • 5.16affected
    • 1e4df4a21c5ac722df1099eee30cad9246c889b5 and later · before 70542b69abff34d24b11ae0bb200cc7a766d18dfaffected · git
    • 1e4df4a21c5ac722df1099eee30cad9246c889b5 and later · before b324327ff6f48d8065dca67eb3b91357e72726bdaffected · git
    • 1e4df4a21c5ac722df1099eee30cad9246c889b5 and later · before ba3bf0f1bf1d5d0404678485e872980532fcc2c4affected · git
    • 1e4df4a21c5ac722df1099eee30cad9246c889b5 and later · before d3e32e2f3262f1b25d77c085ace38e2cc4ad75cfaffected · git
    • 1e4df4a21c5ac722df1099eee30cad9246c889b5 and later · before 40126bcbefa79ea86672e05dae608596bab38319affected · git
    • 1e4df4a21c5ac722df1099eee30cad9246c889b5 and later · before 104016eb671e19709721c1b0048dd912dc2e96beaffected · git
    • before 5.16not affected · semver
    • 6.1.165 and later · up to and including 6.1.*not affected · semver
    • 6.6.128 and later · up to and including 6.6.*not affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
AlmaLinux:10kernelbefore 6.12.0-211.16.1.el10_26.12.0-211.16.1.el10_2
AlmaLinux:10kernel-64kbefore 6.12.0-211.16.1.el10_26.12.0-211.16.1.el10_2
AlmaLinux:10kernel-64k-corebefore 6.12.0-211.16.1.el10_26.12.0-211.16.1.el10_2
AlmaLinux:10kernel-64k-debugbefore 6.12.0-211.16.1.el10_26.12.0-211.16.1.el10_2
AlmaLinux:10kernel-64k-debug-corebefore 6.12.0-211.16.1.el10_26.12.0-211.16.1.el10_2
AlmaLinux:10kernel-64k-debug-develbefore 6.12.0-211.16.1.el10_26.12.0-211.16.1.el10_2
AlmaLinux:10kernel-64k-debug-devel-matchedbefore 6.12.0-211.16.1.el10_26.12.0-211.16.1.el10_2
AlmaLinux:10kernel-64k-debug-modulesbefore 6.12.0-211.16.1.el10_26.12.0-211.16.1.el10_2
AlmaLinux:10kernel-64k-debug-modules-corebefore 6.12.0-211.16.1.el10_26.12.0-211.16.1.el10_2
AlmaLinux:10kernel-64k-debug-modules-extrabefore 6.12.0-211.16.1.el10_26.12.0-211.16.1.el10_2
AlmaLinux:10kernel-64k-develbefore 6.12.0-211.16.1.el10_26.12.0-211.16.1.el10_2
AlmaLinux:10kernel-64k-devel-matchedbefore 6.12.0-211.16.1.el10_26.12.0-211.16.1.el10_2
AlmaLinux:10kernel-64k-modulesbefore 6.12.0-211.16.1.el10_26.12.0-211.16.1.el10_2
AlmaLinux:10kernel-64k-modules-corebefore 6.12.0-211.16.1.el10_26.12.0-211.16.1.el10_2
AlmaLinux:10kernel-64k-modules-extrabefore 6.12.0-211.16.1.el10_26.12.0-211.16.1.el10_2
AlmaLinux:10kernel-abi-stablelistsbefore 6.12.0-211.16.1.el10_26.12.0-211.16.1.el10_2
AlmaLinux:10kernel-corebefore 6.12.0-211.16.1.el10_26.12.0-211.16.1.el10_2
AlmaLinux:10kernel-cross-headersbefore 6.12.0-211.16.1.el10_26.12.0-211.16.1.el10_2
AlmaLinux:10kernel-debugbefore 6.12.0-211.16.1.el10_26.12.0-211.16.1.el10_2
AlmaLinux:10kernel-debug-corebefore 6.12.0-211.16.1.el10_26.12.0-211.16.1.el10_2
AlmaLinux:10kernel-debug-develbefore 6.12.0-211.16.1.el10_26.12.0-211.16.1.el10_2
AlmaLinux:10kernel-debug-devel-matchedbefore 6.12.0-211.16.1.el10_26.12.0-211.16.1.el10_2
AlmaLinux:10kernel-debug-modulesbefore 6.12.0-211.16.1.el10_26.12.0-211.16.1.el10_2
AlmaLinux:10kernel-debug-modules-corebefore 6.12.0-211.16.1.el10_26.12.0-211.16.1.el10_2

+96

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-31431crypto: algif_aead - Revert to operating out-of-placeKEV
    90Now
  • 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…KEV
    89Now
  • CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV
    85Now

Published before and after this one in the same product

  • ← EarlierCVE-2026-43126May 6, 2026 · ALSA: mixer: oss: Add card disconnect checkpoints
    31Monitor
  • ← EarlierCVE-2026-43127May 6, 2026 · ntfs3: fix circular locking dependency in run_unpack_ex
    22Monitor
  • Later →CVE-2026-43129May 6, 2026 · ima: verify the previous kernel's IMA buffer lies in addressable RAM
    22Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux104016eb671e19709721c1b0048dd912dc2e96beVendor (CNA)
Linux Linux40126bcbefa79ea86672e05dae608596bab38319Vendor (CNA)
Linux Linux70542b69abff34d24b11ae0bb200cc7a766d18dfVendor (CNA)
Linux Linuxb324327ff6f48d8065dca67eb3b91357e72726bdVendor (CNA)
Linux Linuxba3bf0f1bf1d5d0404678485e872980532fcc2c4Vendor (CNA)
Linux Linuxd3e32e2f3262f1b25d77c085ace38e2cc4ad75cfVendor (CNA)
almalinux:kernel5.14.0-687.10.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k5.14.0-687.10.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-core5.14.0-687.10.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug5.14.0-687.10.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-core5.14.0-687.10.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-devel5.14.0-687.10.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-devel-matched5.14.0-687.10.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-modules5.14.0-687.10.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-modules-core5.14.0-687.10.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-modules-extra5.14.0-687.10.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-devel5.14.0-687.10.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-devel-matched5.14.0-687.10.1.el9_8 · AlmaLinux:9Package registry (OSV)
debian:linux6.1.170-1 · Debian:12Package registry (OSV)
red hat:kernel-64k-debug-debuginfo0:5.14.0-687.10.1.el9_8 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:kernel-64k-debug-devel0:5.14.0-687.10.1.el9_8 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:kernel-64k-debug-devel-matched0:5.14.0-687.10.1.el9_8 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:kernel-64k-debuginfo0:5.14.0-687.10.1.el9_8 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:kernel-64k-devel0:5.14.0-687.10.1.el9_8 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:kernel-64k-devel-matched0:5.14.0-687.10.1.el9_8 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:kernel-debug-debuginfo0:5.14.0-687.10.1.el9_8 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:kernel-debug-devel0:5.14.0-687.10.1.el9_8 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:kernel-debug-devel-matched0:5.14.0-687.10.1.el9_8 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:kernel-debuginfo0:5.14.0-687.10.1.el9_8 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:kernel-debuginfo-common-aarch640:5.14.0-687.10.1.el9_8 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)

+2

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 researchers

Finders, 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-2026-434142 days apartscsi: qla2xxx: Completely fix fcport double free
    39Monitor
  • CVE-2026-430115 days apartnet/x25: Fix potential double free of skb
    39Monitor
  • CVE-2026-3160812 days apartsmb: server: avoid double-free in smb_direct_free_sendmsg after smb_direct_flush_send_list()
    39Monitor
  • CVE-2026-3160912 days apartsmb: client: avoid double-free in smbd_free_send_io() after smbd_send_batch_flush()
    39Monitor
  • CVE-2026-5299349 days aparttipc: fix double-free in tipc_buf_append()
    39Monitor
  • CVE-2026-6388874 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.

All national notices →

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 Free

CVSS 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

  1. SSVC exploitation— → none
  2. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (5 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records