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NVD / CVE Program· CNA Linux

CVE-2026-98096: ipv6: sr: restore network header before routing and forwarding

Noroxi assessment

Priority: Monitor (action score 29/100)

  • 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: 0.50% (FIRST EPSS).
  • Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. Special conditions such as timing or configuration are required.
  • Fixed version: Linux Linux 3ad7dca5e03bd64c65983a19734337512fd75491, 8f44d4160bcdb3136a9145a4b9c7816382976925, 975b5b067f525a1b1338c4a3bee1c46545801518; azl3 kernel 6.6.157.1-1 on Azure Linux 3.0 6.6.158.1-1.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 3ad7dca5e03bd64c65983a19734337512fd75491, 8f44d4160bcdb3136a9145a4b9c7816382976925, 975b5b067f525a1b1338c4a3bee1c46545801518; azl3 kernel 6.6.157.1-1 on Azure Linux 3.0 6.6.158.1-1 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: ipv6: sr: restore network header before routing and forwarding ipv6_srh_rcv() runs with skb->data at the Segment Routing Header (SRH) while skb_network_header() points at the IPv6 header. When segments_left > 0, ipv6_srh_rcv() previously restored the skb->data position by pushing sizeof(struct ipv6hdr), assuming the SRH immediately followed the fixed IPv6 header. If another extension header (such as a Hop-by-Hop options header) precedes the SRH, skb_network_offset() remained negative. This led to two problems: 1. During ip6_route_input(), fib6_rules_early_flow_dissect() invokes __skb_flow_dissect() which passes the negative skb_network_offset() to flow dissection, breaking BPF and C flow dissector logic. 2. If forwarded via ip6_forward() or redirected via act_mirred, downstream handlers (like sch_fragment() or neighbour output) pass the negative offset as an unsigned length, triggering OOB memcpy or buffer overflows. Fix this by pushing -skb_network_offset(skb) before routing, ensuring skb_network_offset(skb) is 0 for route lookup / flow dissection as well as downstream forwarding. On the loopback path, pull skb_transport_offset(skb) to restore skb->data to the SRH before looping back.

HighCVSS 7.4 · v3.1—No exploit Fix available
Published
Sep 25, 2026
Updated
Oct 28, 2026
EPSS
0.5% · 43th percentile

Report tools

JSON

Action score

29

Monitor

Low priority for now.

CVSS
29 / 40 · 7.4 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.5%

CNA vs NVD score

NVD
—
CNA · Linux
7.4
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

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  • 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 kernel4.10 and later · before 5.10.271
  • linux linux kernel5.11 and later · before 5.15.222
  • linux linux kernel6.0 and later · before 6.1.189
  • linux linux kernel6.2 and later · before 6.6.158
  • linux linux kernel6.7 and later · before 6.12.111
  • linux linux kernel6.13 and later · before 6.18.53
  • linux linux kernel6.19 and later · before 7.2.7
  • linux linux kernel7.3

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
    • 1ababeba4a21f3dba3da3523c670b207fb2feb62 and later · before f463c4786cf27376de7dfc0833a12e924a98f698affected · git
    • 1ababeba4a21f3dba3da3523c670b207fb2feb62 and later · before 8f44d4160bcdb3136a9145a4b9c7816382976925affected · git
    • 1ababeba4a21f3dba3da3523c670b207fb2feb62 and later · before 9cfbe2c381ab6d00a08e7a5b6028865adfb4e1bcaffected · git
    • 1ababeba4a21f3dba3da3523c670b207fb2feb62 and later · before af08f62b5a5a446d6134a92d86771d3d12e0e3daaffected · git
    • 1ababeba4a21f3dba3da3523c670b207fb2feb62 and later · before ce4c8beedc19aceeab0e7bdc6f34394fb158c47caffected · git
    • 1ababeba4a21f3dba3da3523c670b207fb2feb62 and later · before 97b21ef57dfabbff660a4672c9fef7edfb720f47affected · git
    • 1ababeba4a21f3dba3da3523c670b207fb2feb62 and later · before 3ad7dca5e03bd64c65983a19734337512fd75491affected · git
    • 1ababeba4a21f3dba3da3523c670b207fb2feb62 and later · before 975b5b067f525a1b1338c4a3bee1c46545801518affected · git
    • before 4.10not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.190-16.1.190-1
Debian:12linux-6.12before 6.12.111-1~deb12u16.12.111-1~deb12u1
Debian:13linuxbefore 6.12.111-16.12.111-1
Debian:14linuxbefore 7.2.7-17.2.7-1

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-2026-98094Sep 25, 2026 · staging: fbtft: make dirty_lock IRQ-safe
    22Monitor
  • ← EarlierCVE-2026-98095Sep 25, 2026 · af_packet: Don't cast tpacket_hdr.tp_len to int in tpacket_parse_header().
    22Monitor
  • Later →CVE-2026-98097Sep 25, 2026 · tipc: Dont send random pad bytes in RESET/ACTIVATE messages
    21Monitor

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 Linux3ad7dca5e03bd64c65983a19734337512fd75491Vendor (CNA)
Linux Linux8f44d4160bcdb3136a9145a4b9c7816382976925Vendor (CNA)
Linux Linux975b5b067f525a1b1338c4a3bee1c46545801518Vendor (CNA)
Linux Linux97b21ef57dfabbff660a4672c9fef7edfb720f47Vendor (CNA)
Linux Linux9cfbe2c381ab6d00a08e7a5b6028865adfb4e1bcVendor (CNA)
Linux Linuxaf08f62b5a5a446d6134a92d86771d3d12e0e3daVendor (CNA)
Linux Linuxce4c8beedc19aceeab0e7bdc6f34394fb158c47cVendor (CNA)
Linux Linuxf463c4786cf27376de7dfc0833a12e924a98f698Vendor (CNA)
azl3 kernel 6.6.157.1-1 on Azure Linux 3.06.6.158.1-1 · Release NotesMicrosoft (MSRC)
debian:linux6.1.190-1 · Debian:12Package registry (OSV)
debian:linux6.12.111-1 · Debian:13Package registry (OSV)
debian:linux-6.126.12.111-1~deb12u1 · 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.

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).

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

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • Special conditions such as timing or configuration are required.

If successful

Confidentiality
none
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Network
Attack complexity
High
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
High
Availability impact
High

Weakness class (CWE)

CWE-787 · Out-of-bounds Write

CVSS vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/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. 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