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NVD / CVE Program· CNA Linux

CVE-2026-64118: qed: fix double free in qed_cxt_tables_alloc()

Noroxi assessment

Priority: Monitor (action score 33/100)

  • 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: 0.15% (FIRST EPSS).
  • Someone with local access to the system can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: Linux Linux 06fa8e69019fd3c41a7b0ea8c5f509c3a33dc227, 0e47fc1c9181ae029e0e35a865cbf2adcbae626c, 2bccfb8476ca5f3548afbd623dc7a6980d4e77de.

Low priority for now. Upgrade to Linux Linux 06fa8e69019fd3c41a7b0ea8c5f509c3a33dc227, 0e47fc1c9181ae029e0e35a865cbf2adcbae626c, 2bccfb8476ca5f3548afbd623dc7a6980d4e77de 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: qed: fix double free in qed_cxt_tables_alloc() If one of the later PF or VF CID bitmap allocations fails, qed_cid_map_alloc() jumps to cid_map_fail and frees the previously allocated CID bitmaps before returning an error. qed_cxt_tables_alloc() then calls qed_cxt_mngr_free(), which invokes qed_cid_map_free() again. Fix this by setting each CID bitmap pointer to NULL after bitmap_free() to avoid double free. The bug was first flagged by an experimental analysis tool we are developing for kernel memory-management bugs while analyzing v6.13-rc1. The tool is still under development and is not yet publicly available. Manual inspection confirms that the bug is still present in v7.1-rc3. Runtime reproduction was not attempted because exercising the failing allocation path requires device-specific setup.

HighCVSS 8.4 · v3.1—No exploit Fix available
Published
Jul 19, 2026
Updated
Oct 19, 2026
EPSS
0.1% · 4th percentile

Report tools

JSON

Action score

33

Monitor

Low priority for now.

CVSS
33 / 40 · 8.4 / 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
—
CNA · Linux
8.4
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

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When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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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 kernel4.4 and later · before 5.10.259
  • linux linux kernel5.11 and later · before 5.15.210
  • linux linux kernel5.16 and later · before 6.1.175
  • linux linux kernel6.2 and later · before 6.6.142
  • linux linux kernel6.7 and later · before 6.12.92
  • linux linux kernel6.13 and later · before 6.18.34
  • linux linux kernel6.19 and later · before 7.0.11
  • 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

    • 4.4affected
    • fe56b9e6a8d957d6a20729d626027f800c17a2da and later · before 9fe030719bd083b766602692ee96c8c985798e3caffected · git
    • fe56b9e6a8d957d6a20729d626027f800c17a2da and later · before 06fa8e69019fd3c41a7b0ea8c5f509c3a33dc227affected · git
    • fe56b9e6a8d957d6a20729d626027f800c17a2da and later · before 8cf5e4d2ca6b101d163c7423a426fb0aec34f7bbaffected · git
    • fe56b9e6a8d957d6a20729d626027f800c17a2da and later · before 3904b993cc17ec5d7c5d3b57dbd0b775dafb9684affected · git
    • fe56b9e6a8d957d6a20729d626027f800c17a2da and later · before bdf678a273cadbccc347f331ae2e93ff4d14834caffected · git
    • fe56b9e6a8d957d6a20729d626027f800c17a2da and later · before 0e47fc1c9181ae029e0e35a865cbf2adcbae626caffected · git
    • fe56b9e6a8d957d6a20729d626027f800c17a2da and later · before a04c207f0801abdd23a169b5f902a9845059a65aaffected · git
    • fe56b9e6a8d957d6a20729d626027f800c17a2da and later · before 2bccfb8476ca5f3548afbd623dc7a6980d4e77deaffected · git
    • before 4.4not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.176-16.1.176-1
Debian:13linuxbefore 6.12.94-16.12.94-1
Debian:14linuxbefore 7.0.12-17.0.12-1

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-2026-64115Jul 19, 2026 · vsock/vmci: fix UAF when peer resets connection during handshake
    35Monitor
  • ← EarlierCVE-2026-64117Jul 19, 2026 · wifi: mac80211: capture fast-RX rate before mesh reuses skb->cb
    35Monitor
  • Later →CVE-2026-64121Jul 19, 2026 · net: ifb: report ethtool stats over num_tx_queues
    28Monitor

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 Linux06fa8e69019fd3c41a7b0ea8c5f509c3a33dc227Vendor (CNA)
Linux Linux0e47fc1c9181ae029e0e35a865cbf2adcbae626cVendor (CNA)
Linux Linux2bccfb8476ca5f3548afbd623dc7a6980d4e77deVendor (CNA)
Linux Linux3904b993cc17ec5d7c5d3b57dbd0b775dafb9684Vendor (CNA)
Linux Linux8cf5e4d2ca6b101d163c7423a426fb0aec34f7bbVendor (CNA)
Linux Linux9fe030719bd083b766602692ee96c8c985798e3cVendor (CNA)
Linux Linuxa04c207f0801abdd23a169b5f902a9845059a65aVendor (CNA)
Linux Linuxbdf678a273cadbccc347f331ae2e93ff4d14834cVendor (CNA)
debian:linux6.1.176-1 · Debian:12Package 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.

EPSS, last 120 days

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 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-2026-638880 days apartscsi: target: iscsi: Fix CRC overread and double-free in iscsit_handle_text_cmd()
    39Monitor
  • CVE-2026-643836 days apartsmb: client: fix double-free in SMB2_flush() replay
    39Monitor
  • CVE-2026-643846 days apartsmb: client: fix change notify replay double-free
    39Monitor
  • CVE-2026-643856 days apartsmb: client: fix double-free in SMB2_ioctl() replay
    39Monitor
  • CVE-2026-643866 days apartsmb: client: fix query_info() replay double-free
    39Monitor
  • CVE-2026-643876 days apartsmb: client: fix query directory replay double-free
    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).

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • No account or password is required.
  • 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
None
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:N/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

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

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

References

Show all references (7 more)

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

All records