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NVD / CVE Program· CNA Linux

CVE-2026-64046: net: tls: prevent chain-after-chain in plain text SG

Noroxi assessment

Priority: Monitor (action score 39/100)

  • 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: 0.51% (FIRST EPSS).
  • Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
  • According to CISA the attack is automatable: targets can be found by mass scanning.
  • Fixed version: Linux Linux 410351158dfef2d67fea6603680b3a6013c6ed9d, 49a5faaa471ddcd37b6893970c9916eb836e7c31, 5.5.

Low priority for now. Upgrade to Linux Linux 410351158dfef2d67fea6603680b3a6013c6ed9d, 49a5faaa471ddcd37b6893970c9916eb836e7c31, 5.5 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: tls: prevent chain-after-chain in plain text SG Sashiko points out that if end = 0 (start != 0) the current code will create a chain link to content type right after the wrap link: This would create a chain where the wrap link points directly to another chain link. The scatterlist API sg_next iterator does not recursively resolve consecutive chain links. meaning this is illegal input to crypto. The wrapping link is unnecessary if end = 0. end is the entry after the last one used so end = 0 means there's nothing pushed after the wrap: end start i v v v [ ]...[ ][ d ][ d ][ d ][ d ][rsv for wrap] Skip the wrapping in this case. TLS 1.3 can use the "wrapping slot" for it's chaining if end = 0. This avoids the chain-after-chain. Move the wrap chaining before marking END and chaining off content type, that feels like more logical ordering to me, but should not matter from functional perspective.

CriticalCVSS 9.8 · v3.1—No exploit Fix available
Published
Jul 19, 2026
Updated
Oct 19, 2026
EPSS
0.5% · 43th percentile

Report tools

JSON

Action score

39

Monitor

Low priority for now.

CVSS
39 / 40 · 9.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.5%

CISA SSVC decision

Exploitation
none
Automatable
yes
Technical impact
total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · Linux
9.8
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.

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  • 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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  • when exploit code appears or is weaponized
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  • 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 kernel5.4.14 and later · before 5.5
  • linux linux kernel5.5.1 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 6.6.142
  • 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 kernel5.5
  • 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

    • d529d6c9f7e3aaeac13c4948f79799ccb825f29d, 5.5affected
    • 9aaaa56845a06aeabdd597cbe19492dc01f281ec and later · before 49a5faaa471ddcd37b6893970c9916eb836e7c31affected · git
    • 9aaaa56845a06aeabdd597cbe19492dc01f281ec and later · before 91359966e247c0244c66d50bbb8e74aefa4321c3affected · git
    • 9aaaa56845a06aeabdd597cbe19492dc01f281ec and later · before 410351158dfef2d67fea6603680b3a6013c6ed9daffected · git
    • 9aaaa56845a06aeabdd597cbe19492dc01f281ec and later · before acdc12b71c9aa4be5dcd2c8062753c6d2033e235affected · git
    • 9aaaa56845a06aeabdd597cbe19492dc01f281ec and later · before 929b1548e63ac72e104c07d8ee8cbbeeba2fa89aaffected · git
    • 9aaaa56845a06aeabdd597cbe19492dc01f281ec and later · before af855f4c966afafef74faf8390c7b86568c0d46daffected · git
    • 9aaaa56845a06aeabdd597cbe19492dc01f281ec and later · before b9c015ef1a7bf1e8dc67f21c6381f36deb2c3a36affected · git
    • 9aaaa56845a06aeabdd597cbe19492dc01f281ec and later · before ff26a0e8377dec07e4a7230db7675bed1b9a6d03affected · git
    • 5.4.14 and later · before 5.5affected · 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
openSUSE:Leap 16.0dtb-aarch64before 6.12.0-160000.39.16.12.0-160000.39.1
openSUSE:Leap 16.0kernel-64kbbefore 6.12.0-160000.39.16.12.0-160000.39.1
openSUSE:Leap 16.0kernel-azurebefore 6.12.0-160000.39.16.12.0-160000.39.1
openSUSE:Leap 16.0kernel-defaultbefore 6.12.0-160000.39.16.12.0-160000.39.1
openSUSE:Leap 16.0kernel-default-basebefore 6.12.0-160000.39.1.160000.2.256.12.0-160000.39.1.160000.2.25
openSUSE:Leap 16.0kernel-docsbefore 6.12.0-160000.39.16.12.0-160000.39.1
openSUSE:Leap 16.0kernel-kvmsmallbefore 6.12.0-160000.39.16.12.0-160000.39.1
openSUSE:Leap 16.0kernel-obs-buildbefore 6.12.0-160000.39.16.12.0-160000.39.1
openSUSE:Leap 16.0kernel-obs-qabefore 6.12.0-160000.39.16.12.0-160000.39.1
openSUSE:Leap 16.0kernel-rtbefore 6.12.0-160000.39.16.12.0-160000.39.1
openSUSE:Leap 16.0kernel-sourcebefore 6.12.0-160000.39.16.12.0-160000.39.1
openSUSE:Leap 16.0kernel-symsbefore 6.12.0-160000.39.16.12.0-160000.39.1
openSUSE:Leap 16.0kernel-zfcpdumpbefore 6.12.0-160000.39.16.12.0-160000.39.1
SUSE:Linux Enterprise Server 16.0kernel-azurebefore 6.12.0-160000.39.16.12.0-160000.39.1
SUSE:Linux Enterprise Server 16.0kernel-docsbefore 6.12.0-160000.39.16.12.0-160000.39.1
SUSE:Linux Enterprise Server 16.0kernel-kvmsmallbefore 6.12.0-160000.39.16.12.0-160000.39.1
SUSE:Linux Enterprise Server 16.0kernel-obs-qabefore 6.12.0-160000.39.16.12.0-160000.39.1
SUSE:Linux Enterprise Server 16.0kernel-zfcpdumpbefore 6.12.0-160000.39.16.12.0-160000.39.1
SUSE:Linux Micro 6.2kernel-64kbbefore 6.12.0-160000.39.16.12.0-160000.39.1
SUSE:Linux Micro 6.2kernel-defaultbefore 6.12.0-160000.39.16.12.0-160000.39.1
SUSE:Linux Micro 6.2kernel-default-basebefore 6.12.0-160000.39.1.160000.2.266.12.0-160000.39.1.160000.2.26

+4

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-2026-64043Jul 19, 2026 · ovpn: fix race between deleting interface and adding new peer
    18Monitor
  • ← EarlierCVE-2026-64045Jul 19, 2026 · ovpn: tcp - use cached peer pointer in ovpn_tcp_close()
    33Monitor
  • Later →CVE-2026-64047Jul 19, 2026 · net: tls: fix off-by-one in sg_chain entry count for wrapped sk_msg ring
    39Monitor

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 Linux410351158dfef2d67fea6603680b3a6013c6ed9dVendor (CNA)
Linux Linux49a5faaa471ddcd37b6893970c9916eb836e7c31Vendor (CNA)
Linux Linux5.5Vendor (CNA)
Linux Linux91359966e247c0244c66d50bbb8e74aefa4321c3Vendor (CNA)
Linux Linux929b1548e63ac72e104c07d8ee8cbbeeba2fa89aVendor (CNA)
Linux Linuxacdc12b71c9aa4be5dcd2c8062753c6d2033e235Vendor (CNA)
Linux Linuxaf855f4c966afafef74faf8390c7b86568c0d46dVendor (CNA)
Linux Linuxb9c015ef1a7bf1e8dc67f21c6381f36deb2c3a36Vendor (CNA)
Linux Linuxff26a0e8377dec07e4a7230db7675bed1b9a6d03Vendor (CNA)
debian:linux6.1.176-1 · Debian:12Package registry (OSV)
opensuse:dtb-aarch646.12.0-160000.39.1 · openSUSE:Leap 16.0Package registry (OSV)
opensuse:kernel-64kb6.12.0-160000.39.1 · openSUSE:Leap 16.0Package registry (OSV)
opensuse:kernel-azure6.12.0-160000.39.1 · openSUSE:Leap 16.0Package registry (OSV)
opensuse:kernel-default6.12.0-160000.39.1 · openSUSE:Leap 16.0Package registry (OSV)
opensuse:kernel-default-base6.12.0-160000.39.1.160000.2.25 · openSUSE:Leap 16.0Package registry (OSV)
opensuse:kernel-docs6.12.0-160000.39.1 · openSUSE:Leap 16.0Package registry (OSV)
opensuse:kernel-kvmsmall6.12.0-160000.39.1 · openSUSE:Leap 16.0Package registry (OSV)
opensuse:kernel-obs-build6.12.0-160000.39.1 · openSUSE:Leap 16.0Package registry (OSV)
opensuse:kernel-obs-qa6.12.0-160000.39.1 · openSUSE:Leap 16.0Package registry (OSV)
opensuse:kernel-rt6.12.0-160000.39.1 · openSUSE:Leap 16.0Package registry (OSV)
opensuse:kernel-source6.12.0-160000.39.1 · openSUSE:Leap 16.0Package registry (OSV)
opensuse:kernel-syms6.12.0-160000.39.1 · openSUSE:Leap 16.0Package registry (OSV)
suse:kernel-64kb6.12.0-160000.39.1 · SUSE:Linux Micro 6.2Package registry (OSV)
suse:kernel-azure6.12.0-160000.39.1 · SUSE:Linux Enterprise Server 16.0Package registry (OSV)
suse:kernel-default6.12.0-160000.39.1 · SUSE:Linux Micro 6.2Package registry (OSV)
suse:kernel-default-base6.12.0-160000.39.1.160000.2.26 · SUSE:Linux Micro 6.2Package registry (OSV)
suse:kernel-docs6.12.0-160000.39.1 · SUSE:Linux Enterprise Server 16.0Package registry (OSV)
suse:kernel-kvmsmall6.12.0-160000.39.1 · SUSE:Linux Enterprise Server 16.0Package registry (OSV)
suse:kernel-obs-build6.12.0-160000.39.1 · SUSE:Linux Micro Extras 6.2Package registry (OSV)
suse:kernel-obs-qa6.12.0-160000.39.1 · SUSE:Linux Enterprise Server 16.0Package 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.

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-2026-640370 days apartwifi: iwlwifi: mld: fix TSO segmentation explosion when AMSDU is disabled
    39Monitor
  • CVE-2026-5322124 days apartip6_vti: fix incorrect tunnel matching in vti6_tnl_lookup()
    39Monitor
  • CVE-2026-4611552 days apartblock: add pgmap check to biovec_phys_mergeable
    39Monitor
  • CVE-2026-4311474 days apartnetfilter: nft_set_pipapo_avx2: don't return non-matching entry on expiry
    37Monitor
  • CVE-2026-641060 days apartKVM: arm64: vgic-its: Reject restored DTE with out-of-range num_eventid_bits
    36Monitor
  • CVE-2026-4626646 days apartinet: RAW sockets using IPPROTO_RAW MUST drop incoming ICMP
    36Monitor

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

  • Anyone who can reach it over the internet 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
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

CWE-20 · Improper Input Validation

CVSS vector

CVSS:3.1/AV:N/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.

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