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NVD / CVE Program· CNA Linux

CVE-2024-26641: ip6_tunnel: make sure to pull inner header in __ip6_tnl_rcv()

Noroxi assessment

Priority: Monitor (action score 22/100)

  • 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: 0.57% (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 350a6640fac4b53564ec20aa3f4a0922cb0ba5e6, 8d975c15c0cd744000ca386247432d57b21f9df0, a9bc32879a08f23cdb80a48c738017e39aea1080.
  • Severity is disputed: the assigning authority (CNA) scores it 8.6, NVD 5.5.
  • Mentioned 2 times in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 350a6640fac4b53564ec20aa3f4a0922cb0ba5e6, 8d975c15c0cd744000ca386247432d57b21f9df0, a9bc32879a08f23cdb80a48c738017e39aea1080 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: ip6_tunnel: make sure to pull inner header in __ip6_tnl_rcv() syzbot found __ip6_tnl_rcv() could access unitiliazed data [1]. Call pskb_inet_may_pull() to fix this, and initialize ipv6h variable after this call as it can change skb->head. [1] BUG: KMSAN: uninit-value in __INET_ECN_decapsulate include/net/inet_ecn.h:253 [inline] BUG: KMSAN: uninit-value in INET_ECN_decapsulate include/net/inet_ecn.h:275 [inline] BUG: KMSAN: uninit-value in IP6_ECN_decapsulate+0x7df/0x1e50 include/net/inet_ecn.h:321 __INET_ECN_decapsulate include/net/inet_ecn.h:253 [inline] INET_ECN_decapsulate include/net/inet_ecn.h:275 [inline] IP6_ECN_decapsulate+0x7df/0x1e50 include/net/inet_ecn.h:321 ip6ip6_dscp_ecn_decapsulate+0x178/0x1b0 net/ipv6/ip6_tunnel.c:727 __ip6_tnl_rcv+0xd4e/0x1590 net/ipv6/ip6_tunnel.c:845 ip6_tnl_rcv+0xce/0x100 net/ipv6/ip6_tunnel.c:888 gre_rcv+0x143f/0x1870 ip6_protocol_deliver_rcu+0xda6/0x2a60 net/ipv6/ip6_input.c:438 ip6_input_finish net/ipv6/ip6_input.c:483 [inline] NF_HOOK include/linux/netfilter.h:314 [inline] ip6_input+0x15d/0x430 net/ipv6/ip6_input.c:492 ip6_mc_input+0xa7e/0xc80 net/ipv6/ip6_input.c:586 dst_input include/net/dst.h:461 [inline] ip6_rcv_finish+0x5db/0x870 net/ipv6/ip6_input.c:79 NF_HOOK include/linux/netfilter.h:314 [inline] ipv6_rcv+0xda/0x390 net/ipv6/ip6_input.c:310 __netif_receive_skb_one_core net/core/dev.c:5532 [inline] __netif_receive_skb+0x1a6/0x5a0 net/core/dev.c:5646 netif_receive_skb_internal net/core/dev.c:5732 [inline] netif_receive_skb+0x58/0x660 net/core/dev.c:5791 tun_rx_batched+0x3ee/0x980 drivers/net/tun.c:1555 tun_get_user+0x53af/0x66d0 drivers/net/tun.c:2002 tun_chr_write_iter+0x3af/0x5d0 drivers/net/tun.c:2048 call_write_iter include/linux/fs.h:2084 [inline] new_sync_write fs/read_write.c:497 [inline] vfs_write+0x786/0x1200 fs/read_write.c:590 ksys_write+0x20f/0x4c0 fs/read_write.c:643 __do_sys_write fs/read_write.c:655 [inline] __se_sys_write fs/read_write.c:652 [inline] __x64_sys_write+0x93/0xd0 fs/read_write.c:652 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0x6d/0x140 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x63/0x6b Uninit was created at: slab_post_alloc_hook+0x129/0xa70 mm/slab.h:768 slab_alloc_node mm/slub.c:3478 [inline] kmem_cache_alloc_node+0x5e9/0xb10 mm/slub.c:3523 kmalloc_reserve+0x13d/0x4a0 net/core/skbuff.c:560 __alloc_skb+0x318/0x740 net/core/skbuff.c:651 alloc_skb include/linux/skbuff.h:1286 [inline] alloc_skb_with_frags+0xc8/0xbd0 net/core/skbuff.c:6334 sock_alloc_send_pskb+0xa80/0xbf0 net/core/sock.c:2787 tun_alloc_skb drivers/net/tun.c:1531 [inline] tun_get_user+0x1e8a/0x66d0 drivers/net/tun.c:1846 tun_chr_write_iter+0x3af/0x5d0 drivers/net/tun.c:2048 call_write_iter include/linux/fs.h:2084 [inline] new_sync_write fs/read_write.c:497 [inline] vfs_write+0x786/0x1200 fs/read_write.c:590 ksys_write+0x20f/0x4c0 fs/read_write.c:643 __do_sys_write fs/read_write.c:655 [inline] __se_sys_write fs/read_write.c:652 [inline] __x64_sys_write+0x93/0xd0 fs/read_write.c:652 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0x6d/0x140 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x63/0x6b CPU: 0 PID: 5034 Comm: syz-executor331 Not tainted 6.7.0-syzkaller-00562-g9f8413c4a66f #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023

MediumCVSS 5.5 · v3.1—No exploit Fix available
Published
Mar 18, 2024
Updated
Aug 5, 2026
EPSS
0.5% · 47th percentile

Report tools

JSON

Action score

22

Monitor

Low priority for now.

CVSS
22 / 40 · 5.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.5%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
5.5
CNA · Linux
8.6
3.1 point gap

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H

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

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2024-26641

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.

We use this product, ask for help

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
debiandebian linux
netappactive iq unified manager
netappontap select deploy administration utility
netappa800 firmware
netappa800
netappc800 firmware
netappc800
netappa900 firmware
netappa900
netappfas9500 firmware
netappfas9500

and 12 more

Affected versions

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

  • debian debian linux10.0
  • linux linux kernel5.11 and later · before 5.15.149
  • linux linux kernel5.16 and later · before 6.1.77
  • linux linux kernel6.2 and later · before 6.6.16
  • linux linux kernel6.7 and later · before 6.7.4
  • linux linux kernel4.7 and later · before 5.10.210
  • linux linux kernel6.8
  • netapp a150 firmwareall versions
  • netapp a220 firmwareall versions
  • netapp a800 firmwareall versions
  • netapp a900 firmwareall versions
  • netapp active iq unified managerall versions
  • netapp c190 firmwareall versions
  • netapp c800 firmwareall versions
  • netapp fas2720 firmwareall versions
  • netapp fas2750 firmwareall versions
  • netapp fas2820 firmwareall versions
  • netapp fas9500 firmwareall versions
  • netapp ontap select deploy administration utilityall versions

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

    • 4.7affected
    • 0d3c703a9d1723c7707e0680019ac8ff5922db42 and later · before a9bc32879a08f23cdb80a48c738017e39aea1080affected · git
    • 0d3c703a9d1723c7707e0680019ac8ff5922db42 and later · before af6b5c50d47ab43e5272ad61935d0ed2e264d3f0affected · git
    • 0d3c703a9d1723c7707e0680019ac8ff5922db42 and later · before d54e4da98bbfa8c257bdca94c49652d81d18a4d8affected · git
    • 0d3c703a9d1723c7707e0680019ac8ff5922db42 and later · before 350a6640fac4b53564ec20aa3f4a0922cb0ba5e6affected · git
    • 0d3c703a9d1723c7707e0680019ac8ff5922db42 and later · before c835df3bcc14858ae9b27315dd7de76370b94f3aaffected · git
    • 0d3c703a9d1723c7707e0680019ac8ff5922db42 and later · before 8d975c15c0cd744000ca386247432d57b21f9df0affected · git
    • before 4.7not affected · semver
    • 5.10.210 and later · up to and including 5.10.*not affected · semver
    • 5.15.149 and later · up to and including 5.15.*not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.82-16.1.82-1
Debian:13linuxbefore 6.7.7-16.7.7-1
openSUSE:Leap 15.6dtb-aarch64before 6.4.0-150600.23.17.16.4.0-150600.23.17.1
openSUSE:Leap 15.6kernel-64kbbefore 6.4.0-150600.23.17.16.4.0-150600.23.17.1
openSUSE:Leap 15.6kernel-debugbefore 6.4.0-150600.23.17.16.4.0-150600.23.17.1
openSUSE:Leap 15.6kernel-defaultbefore 6.4.0-150600.23.17.16.4.0-150600.23.17.1
openSUSE:Leap 15.6kernel-default-basebefore 6.4.0-150600.23.17.1.150600.12.6.26.4.0-150600.23.17.1.150600.12.6.2
openSUSE:Leap 15.6kernel-docsbefore 6.4.0-150600.23.17.36.4.0-150600.23.17.3
openSUSE:Leap 15.6kernel-kvmsmallbefore 6.4.0-150600.23.17.16.4.0-150600.23.17.1
openSUSE:Leap 15.6kernel-obs-buildbefore 6.4.0-150600.23.17.16.4.0-150600.23.17.1
openSUSE:Leap 15.6kernel-obs-qabefore 6.4.0-150600.23.17.16.4.0-150600.23.17.1
openSUSE:Leap 15.6kernel-sourcebefore 6.4.0-150600.23.17.16.4.0-150600.23.17.1
openSUSE:Leap 15.6kernel-symsbefore 6.4.0-150600.23.17.16.4.0-150600.23.17.1
openSUSE:Leap 15.6kernel-zfcpdumpbefore 6.4.0-150600.23.17.16.4.0-150600.23.17.1
SUSE:Linux Enterprise Live Patching 15 SP6kernel-livepatch-SLE15-SP6_Update_3before 1-150600.13.3.11-150600.13.3.1
SUSE:Linux Enterprise Module for Basesystem 15 SP6kernel-64kbbefore 6.4.0-150600.23.17.16.4.0-150600.23.17.1
SUSE:Linux Enterprise Module for Basesystem 15 SP6kernel-defaultbefore 6.4.0-150600.23.17.16.4.0-150600.23.17.1
SUSE:Linux Enterprise Module for Basesystem 15 SP6kernel-default-basebefore 6.4.0-150600.23.17.1.150600.12.6.26.4.0-150600.23.17.1.150600.12.6.2
SUSE:Linux Enterprise Module for Basesystem 15 SP6kernel-sourcebefore 6.4.0-150600.23.17.16.4.0-150600.23.17.1
SUSE:Linux Enterprise Module for Basesystem 15 SP6kernel-zfcpdumpbefore 6.4.0-150600.23.17.16.4.0-150600.23.17.1
SUSE:Linux Enterprise Module for Development Tools 15 SP6kernel-docsbefore 6.4.0-150600.23.17.36.4.0-150600.23.17.3
SUSE:Linux Enterprise Module for Development Tools 15 SP6kernel-obs-buildbefore 6.4.0-150600.23.17.16.4.0-150600.23.17.1
SUSE:Linux Enterprise Module for Development Tools 15 SP6kernel-symsbefore 6.4.0-150600.23.17.16.4.0-150600.23.17.1

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-2024-26638Mar 18, 2024 · nbd: always initialize struct msghdr completely
    17Monitor
  • ← EarlierCVE-2024-26640Mar 18, 2024 · tcp: add sanity checks to rx zerocopy
    22Monitor
  • Later →CVE-2023-52612Mar 18, 2024 · crypto: scomp - fix req->dst buffer overflow
    31Monitor

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 Linux350a6640fac4b53564ec20aa3f4a0922cb0ba5e6Vendor (CNA)
Linux Linux8d975c15c0cd744000ca386247432d57b21f9df0Vendor (CNA)
Linux Linuxa9bc32879a08f23cdb80a48c738017e39aea1080Vendor (CNA)
Linux Linuxaf6b5c50d47ab43e5272ad61935d0ed2e264d3f0Vendor (CNA)
Linux Linuxc835df3bcc14858ae9b27315dd7de76370b94f3aVendor (CNA)
Linux Linuxd54e4da98bbfa8c257bdca94c49652d81d18a4d8Vendor (CNA)
debian:linux6.1.82-1 · Debian:12Package registry (OSV)
opensuse:dtb-aarch646.4.0-150600.23.17.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-64kb6.4.0-150600.23.17.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-debug6.4.0-150600.23.17.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-default6.4.0-150600.23.17.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-default-base6.4.0-150600.23.17.1.150600.12.6.2 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-docs6.4.0-150600.23.17.3 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-kvmsmall6.4.0-150600.23.17.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-obs-build6.4.0-150600.23.17.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-obs-qa6.4.0-150600.23.17.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-source6.4.0-150600.23.17.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-syms6.4.0-150600.23.17.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-zfcpdump6.4.0-150600.23.17.1 · openSUSE:Leap 15.6Package registry (OSV)
suse:kernel-64kb6.4.0-150600.23.17.1 · SUSE:Linux Enterprise Module for Basesystem 15 SP6Package registry (OSV)
suse:kernel-default6.4.0-150600.23.17.1 · SUSE:Linux Enterprise Module for Basesystem 15 SP6Package registry (OSV)
suse:kernel-default-base6.4.0-150600.23.17.1.150600.12.6.2 · SUSE:Linux Enterprise Module for Basesystem 15 SP6Package registry (OSV)
suse:kernel-docs6.4.0-150600.23.17.3 · SUSE:Linux Enterprise Module for Development Tools 15 SP6Package registry (OSV)
suse:kernel-livepatch-SLE15-SP6_Update_31-150600.13.3.1 · SUSE:Linux Enterprise Live Patching 15 SP6Package registry (OSV)
suse:kernel-obs-build6.4.0-150600.23.17.1 · SUSE:Linux Enterprise Module for Development Tools 15 SP6Package registry (OSV)
suse:kernel-source6.4.0-150600.23.17.1 · SUSE:Linux Enterprise Module for Basesystem 15 SP6Package registry (OSV)
suse:kernel-syms6.4.0-150600.23.17.1 · SUSE:Linux Enterprise Module for Development Tools 15 SP6Package registry (OSV)
suse:kernel-zfcpdump6.4.0-150600.23.17.1 · SUSE:Linux Enterprise Module for Basesystem 15 SP6Package 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.

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-2024-50302246 days apartHID: core: zero-initialize the report bufferKEV
    52Plan
  • CVE-2024-47685217 days apartnetfilter: nf_reject_ipv6: fix nf_reject_ip6_tcphdr_put()
    36Monitor
  • CVE-2024-2702244 days apartfork: defer linking file vma until vma is fully initialized
    31Monitor
  • CVE-2021-4755367 days apartsched/scs: Reset task stack state in bringup_cpu()
    31Monitor
  • CVE-2024-3689873 days apartgpiolib: cdev: fix uninitialised kfifo
    31Monitor
  • CVE-2024-50143234 days apartudf: fix uninit-value use in udf_get_fileshortad
    31Monitor

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
none
Integrity
none
Availability
high · the service can be disrupted
Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
None
Availability impact
High

Weakness class (CWE)

CWE-908 · Use of Uninitialized Resource

CVSS vector

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