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NVD / CVE Program· CNA Linux

CVE-2026-64114: ipv4: raw: reject IP_HDRINCL packets with ihl < 5

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 1065b9efa4126df559b03a849c139ecfae92cd25, 145e9afa5b905229b4788bb72c3255f5a5f77508, 3c5411fa4944ed99af3d9d1de750ea8169b6dac9.

Low priority for now. Upgrade to Linux Linux 1065b9efa4126df559b03a849c139ecfae92cd25, 145e9afa5b905229b4788bb72c3255f5a5f77508, 3c5411fa4944ed99af3d9d1de750ea8169b6dac9 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: ipv4: raw: reject IP_HDRINCL packets with ihl < 5 raw_send_hdrinc() validates that the caller-supplied IPv4 header fits within the message length: iphlen = iph->ihl * 4; err = -EINVAL; if (iphlen > length) goto error_free; if (iphlen >= sizeof(*iph)) { /* fix up saddr, tot_len, id, csum, transport_header */ } It does not, however, reject ihl < 5. For such a packet the "if (iphlen >= sizeof(*iph))" branch is skipped, leaving the crafted iphdr untouched, but the packet is still handed to __ip_local_out() and onward. Downstream consumers that read iph->ihl assume a sane value: net/ipv4/ah4.c:ah_output() in particular subtracts sizeof(struct iphdr) from top_iph->ihl * 4 and passes the (signed-int-negative, then cast to size_t) result to memcpy(), producing an OOB access of length close to SIZE_MAX and a host kernel panic. An IPv4 header with ihl < 5 is malformed by definition (RFC 791: "Internet Header Length is the length of the internet header in 32 bit words ... Note that the minimum value for a correct header is 5."). The kernel should not be willing to inject such a packet into its own output path. Reject "iphlen < sizeof(*iph)" alongside the existing "iphlen > length" check. This matches the principle that locally constructed packets that re-enter the IP stack must pass the same basic sanity tests that a foreign packet would be subjected to. Once this lands, the "if (iphlen >= sizeof(*iph))" wrapper around the fixup branch becomes redundant; left in place to keep the patch minimal and backport-friendly. A follow-up can unwrap it. Note that commit 86f4c90a1c5c ("ipv4, ipv6: ensure raw socket message is big enough to hold an IP header") ensures the message buffer is large enough to hold an iphdr, but does not constrain the self-reported iph->ihl. Reachability: the malformed packet source is any caller with CAP_NET_RAW, including an unprivileged process in a user+net namespace on a kernel with CONFIG_USER_NS=y. The reproduced AH crash also requires a matching xfrm AH policy on the outgoing route; a container granted CAP_NET_ADMIN can install that state and policy in its netns. Loopback bypasses xfrm_output, so the trigger uses a real netdev. Reproduced on UML + KASAN: kernel-mode fault at addr 0x0 with memcpy_orig at the crash site. Same shape reproduces inside a rootless Docker container with --cap-add NET_ADMIN on a stock distro kernel.

HighCVSS 7.8 · v3.1—No exploit Fix available
Published
Jul 19, 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
—
CNA · Linux
7.8
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

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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 kernel2.6.12.1 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 kernel2.6.12
  • 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

    • 2.6.12affected
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 1065b9efa4126df559b03a849c139ecfae92cd25affected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before bc20dbd48c26e743f7e0845020c11ed2ce8b15eeaffected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 5a564f737ec54d63e8ee221d3ff396d07586d464affected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 3c5411fa4944ed99af3d9d1de750ea8169b6dac9affected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 145e9afa5b905229b4788bb72c3255f5a5f77508affected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 7725cd3b471740fd23d25ed1da722c671fb2a5d3affected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before bbe0be67de296176e7243c76e3d9f02f6ae9ff0baffected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 915fab69823a14c170dbaa3b41978768e0fe62fcaffected · git
    • before 2.6.12not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
AlmaLinux:10kernelbefore 6.12.0-211.68.1.el10_26.12.0-211.68.1.el10_2
AlmaLinux:10kernel-64kbefore 6.12.0-211.68.1.el10_26.12.0-211.68.1.el10_2
AlmaLinux:10kernel-64k-corebefore 6.12.0-211.68.1.el10_26.12.0-211.68.1.el10_2
AlmaLinux:10kernel-64k-debugbefore 6.12.0-211.68.1.el10_26.12.0-211.68.1.el10_2
AlmaLinux:10kernel-64k-debug-corebefore 6.12.0-211.68.1.el10_26.12.0-211.68.1.el10_2
AlmaLinux:10kernel-64k-debug-develbefore 6.12.0-211.68.1.el10_26.12.0-211.68.1.el10_2
AlmaLinux:10kernel-64k-debug-devel-matchedbefore 6.12.0-211.68.1.el10_26.12.0-211.68.1.el10_2
AlmaLinux:10kernel-64k-debug-modulesbefore 6.12.0-211.68.1.el10_26.12.0-211.68.1.el10_2
AlmaLinux:10kernel-64k-debug-modules-corebefore 6.12.0-211.68.1.el10_26.12.0-211.68.1.el10_2
AlmaLinux:10kernel-64k-debug-modules-extrabefore 6.12.0-211.68.1.el10_26.12.0-211.68.1.el10_2
AlmaLinux:10kernel-64k-develbefore 6.12.0-211.68.1.el10_26.12.0-211.68.1.el10_2
AlmaLinux:10kernel-64k-devel-matchedbefore 6.12.0-211.68.1.el10_26.12.0-211.68.1.el10_2
AlmaLinux:10kernel-64k-modulesbefore 6.12.0-211.68.1.el10_26.12.0-211.68.1.el10_2
AlmaLinux:10kernel-64k-modules-corebefore 6.12.0-211.68.1.el10_26.12.0-211.68.1.el10_2
AlmaLinux:10kernel-64k-modules-extrabefore 6.12.0-211.68.1.el10_26.12.0-211.68.1.el10_2
AlmaLinux:10kernel-abi-stablelistsbefore 6.12.0-211.68.1.el10_26.12.0-211.68.1.el10_2
AlmaLinux:10kernel-corebefore 6.12.0-211.68.1.el10_26.12.0-211.68.1.el10_2
AlmaLinux:10kernel-cross-headersbefore 6.12.0-211.68.1.el10_26.12.0-211.68.1.el10_2
AlmaLinux:10kernel-debugbefore 6.12.0-211.68.1.el10_26.12.0-211.68.1.el10_2
AlmaLinux:10kernel-debug-corebefore 6.12.0-211.68.1.el10_26.12.0-211.68.1.el10_2
AlmaLinux:10kernel-debug-develbefore 6.12.0-211.68.1.el10_26.12.0-211.68.1.el10_2
AlmaLinux:10kernel-debug-devel-matchedbefore 6.12.0-211.68.1.el10_26.12.0-211.68.1.el10_2
AlmaLinux:10kernel-debug-modulesbefore 6.12.0-211.68.1.el10_26.12.0-211.68.1.el10_2
AlmaLinux:10kernel-debug-modules-corebefore 6.12.0-211.68.1.el10_26.12.0-211.68.1.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-2026-64112Jul 19, 2026 · rbd: eliminate a race in lock_dwork draining on unmap
    31Monitor
  • ← EarlierCVE-2026-64113Jul 19, 2026 · ixgbevf: fix use-after-free in VEPA multicast source pruning
    39Monitor
  • Later →CVE-2026-64115Jul 19, 2026 · vsock/vmci: fix UAF when peer resets connection during handshake
    35Monitor

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 Linux1065b9efa4126df559b03a849c139ecfae92cd25Vendor (CNA)
Linux Linux145e9afa5b905229b4788bb72c3255f5a5f77508Vendor (CNA)
Linux Linux3c5411fa4944ed99af3d9d1de750ea8169b6dac9Vendor (CNA)
Linux Linux5a564f737ec54d63e8ee221d3ff396d07586d464Vendor (CNA)
Linux Linux7725cd3b471740fd23d25ed1da722c671fb2a5d3Vendor (CNA)
Linux Linux915fab69823a14c170dbaa3b41978768e0fe62fcVendor (CNA)
Linux Linuxbbe0be67de296176e7243c76e3d9f02f6ae9ff0bVendor (CNA)
Linux Linuxbc20dbd48c26e743f7e0845020c11ed2ce8b15eeVendor (CNA)
almalinux:kernel5.14.0-687.59.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k5.14.0-687.59.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-core5.14.0-687.59.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug5.14.0-687.59.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-core5.14.0-687.59.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-devel5.14.0-687.59.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-devel-matched5.14.0-687.59.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-modules5.14.0-687.59.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-modules-core5.14.0-687.59.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-modules-extra5.14.0-687.59.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-devel5.14.0-687.59.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-devel-matched5.14.0-687.59.1.el9_8 · AlmaLinux:9Package registry (OSV)
debian:linux6.1.176-1 · Debian:12Package registry (OSV)
rocky linux:kernel0:5.14.0-687.59.1.el9_8 · Rocky Linux:9Package registry (OSV)
rocky linux:kernel-rt0:4.18.0-553.177.1.rt7.518.el8_10 · Rocky Linux:8Package registry (OSV)
suse:kernel-default3.0.101-108.216.1 · SUSE:Linux Enterprise Server 11 SP4 LTSS EXTREME COREPackage registry (OSV)
suse:kernel-docs3.0.101-108.216.1 · SUSE:Linux Enterprise Server 11 SP4 LTSS EXTREME COREPackage registry (OSV)
suse:kernel-ec23.0.101-108.216.1 · SUSE:Linux Enterprise Server 11 SP4 LTSS EXTREME COREPackage registry (OSV)
suse:kernel-livepatch-SLE15-SP7_Update_713-150700.2.1 · SUSE:Linux Enterprise Live Patching 15 SP7Package registry (OSV)
suse:kernel-livepatch-SLE15-SP7-RT_Update_138-150700.2.1 · SUSE:Linux Enterprise Live Patching 15 SP7Package registry (OSV)
suse:kernel-livepatch-SLE15-SP7-RT_Update_193-150700.2.1 · SUSE:Linux Enterprise Live Patching 15 SP7Package registry (OSV)
suse:kernel-livepatch-SLE16-RT_Update_108-160000.1.1 · SUSE:Linux Micro 6.2Package registry (OSV)

+17

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).

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-125 · Out-of-bounds Read

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/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.

ATT&CK techniques

—

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