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NVD / CVE Program· CNA Linux

CVE-2024-26635: llc: Drop support for ETH_P_TR_802_2.

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: 0.24% (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 165ad1e22779685c3ed3dd349c6c4c632309cc62, 660c3053d992b68fee893a0e9ec9159228cffdc6, 9ccdef19cf9497c2803b005369668feb91cacdfd.
  • Mentioned 2 times in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 165ad1e22779685c3ed3dd349c6c4c632309cc62, 660c3053d992b68fee893a0e9ec9159228cffdc6, 9ccdef19cf9497c2803b005369668feb91cacdfd 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: llc: Drop support for ETH_P_TR_802_2. syzbot reported an uninit-value bug below. [0] llc supports ETH_P_802_2 (0x0004) and used to support ETH_P_TR_802_2 (0x0011), and syzbot abused the latter to trigger the bug. write$tun(r0, &(0x7f0000000040)={@val={0x0, 0x11}, @val, @mpls={[], @llc={@snap={0xaa, 0x1, ')', "90e5dd"}}}}, 0x16) llc_conn_handler() initialises local variables {saddr,daddr}.mac based on skb in llc_pdu_decode_sa()/llc_pdu_decode_da() and passes them to __llc_lookup(). However, the initialisation is done only when skb->protocol is htons(ETH_P_802_2), otherwise, __llc_lookup_established() and __llc_lookup_listener() will read garbage. The missing initialisation existed prior to commit 211ed865108e ("net: delete all instances of special processing for token ring"). It removed the part to kick out the token ring stuff but forgot to close the door allowing ETH_P_TR_802_2 packets to sneak into llc_rcv(). Let's remove llc_tr_packet_type and complete the deprecation. [0]: BUG: KMSAN: uninit-value in __llc_lookup_established+0xe9d/0xf90 __llc_lookup_established+0xe9d/0xf90 __llc_lookup net/llc/llc_conn.c:611 [inline] llc_conn_handler+0x4bd/0x1360 net/llc/llc_conn.c:791 llc_rcv+0xfbb/0x14a0 net/llc/llc_input.c:206 __netif_receive_skb_one_core net/core/dev.c:5527 [inline] __netif_receive_skb+0x1a6/0x5a0 net/core/dev.c:5641 netif_receive_skb_internal net/core/dev.c:5727 [inline] netif_receive_skb+0x58/0x660 net/core/dev.c:5786 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:2020 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x8ef/0x1490 fs/read_write.c:584 ksys_write+0x20f/0x4c0 fs/read_write.c:637 __do_sys_write fs/read_write.c:649 [inline] __se_sys_write fs/read_write.c:646 [inline] __x64_sys_write+0x93/0xd0 fs/read_write.c:646 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x44/0x110 arch/x86/entry/common.c:82 entry_SYSCALL_64_after_hwframe+0x63/0x6b Local variable daddr created at: llc_conn_handler+0x53/0x1360 net/llc/llc_conn.c:783 llc_rcv+0xfbb/0x14a0 net/llc/llc_input.c:206 CPU: 1 PID: 5004 Comm: syz-executor994 Not tainted 6.6.0-syzkaller-14500-g1c41041124bd #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/09/2023

MediumCVSS 5.5 · v3.1—No exploit Fix available
Published
Mar 18, 2024
Updated
Jun 17, 2026
EPSS
0.2% · 15th 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 · 0.2%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

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.

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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
debiandebian linux

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 kernel4.20 and later · before 5.4.269
  • linux linux kernel5.5 and later · before 5.10.210
  • linux linux kernel5.11 and later · before 5.15.149
  • linux linux kernel3.5 and later · before 4.19.307
  • linux linux kernel6.2 and later · before 6.6.15
  • linux linux kernel6.7 and later · before 6.7.3
  • linux linux kernel5.16 and later · before 6.1.76
  • linux linux kernel6.8

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

    • 3.5affected
    • 211ed865108e24697b44bee5daac502ee6bdd4a4 and later · before 165ad1e22779685c3ed3dd349c6c4c632309cc62affected · git
    • 211ed865108e24697b44bee5daac502ee6bdd4a4 and later · before b8e8838f82f332ae80c643dbb1ca4418d0628097affected · git
    • 211ed865108e24697b44bee5daac502ee6bdd4a4 and later · before 9ccdef19cf9497c2803b005369668feb91cacdfdaffected · git
    • 211ed865108e24697b44bee5daac502ee6bdd4a4 and later · before c0fe2fe7a5a291dfcf6dc64301732c8d3dc6a828affected · git
    • 211ed865108e24697b44bee5daac502ee6bdd4a4 and later · before 660c3053d992b68fee893a0e9ec9159228cffdc6affected · git
    • 211ed865108e24697b44bee5daac502ee6bdd4a4 and later · before f1f34a515fb1e25e85dee94f781e7869ae351fb8affected · git
    • 211ed865108e24697b44bee5daac502ee6bdd4a4 and later · before df57fc2f2abf548aa889a36ab0bdcc94a75399dcaffected · git
    • 211ed865108e24697b44bee5daac502ee6bdd4a4 and later · before e3f9bed9bee261e3347131764e42aeedf1ffea61affected · git
    • before 3.5not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.76-16.1.76-1
Debian:13linuxbefore 6.6.15-16.6.15-1
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
SUSE:Linux Enterprise Real Time 12 SP5kernel-rtbefore 4.12.14-10.194.14.12.14-10.194.1

+3

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-2024-26633Mar 18, 2024 · ip6_tunnel: fix NEXTHDR_FRAGMENT handling in ip6_tnl_parse_tlv_enc_lim()
    22Monitor
  • ← EarlierCVE-2024-26634Mar 18, 2024 · net: fix removing a namespace with conflicting altnames
    22Monitor
  • Later →CVE-2024-26636Mar 18, 2024 · llc: make llc_ui_sendmsg() more robust against bonding changes
    22Monitor

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 Linux165ad1e22779685c3ed3dd349c6c4c632309cc62Vendor (CNA)
Linux Linux660c3053d992b68fee893a0e9ec9159228cffdc6Vendor (CNA)
Linux Linux9ccdef19cf9497c2803b005369668feb91cacdfdVendor (CNA)
Linux Linuxb8e8838f82f332ae80c643dbb1ca4418d0628097Vendor (CNA)
Linux Linuxc0fe2fe7a5a291dfcf6dc64301732c8d3dc6a828Vendor (CNA)
Linux Linuxdf57fc2f2abf548aa889a36ab0bdcc94a75399dcVendor (CNA)
Linux Linuxe3f9bed9bee261e3347131764e42aeedf1ffea61Vendor (CNA)
Linux Linuxf1f34a515fb1e25e85dee94f781e7869ae351fb8Vendor (CNA)
debian:linux6.1.76-1 · 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-rt4.12.14-10.194.1 · SUSE:Linux Enterprise Real Time 12 SP5Package registry (OSV)
suse:kernel-rt_debug4.12.14-10.194.1 · SUSE:Linux Enterprise Real Time 12 SP5Package registry (OSV)
suse:kernel-source6.4.0-150600.23.17.1 · SUSE:Linux Enterprise Module for Basesystem 15 SP6Package 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.

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-2024-43873155 days apartvhost/vsock: always initialize seqpacket_allow
    31Monitor
  • CVE-2022-49865409 days apartipv6: addrlabel: fix infoleak when sending struct ifaddrlblmsg to network
    28Monitor
  • CVE-2022-50169457 days apartwifi: wil6210: debugfs: fix info leak in wil_write_file_wmi()
    28Monitor
  • CVE-2024-50076225 days apartvt: prevent kernel-infoleak in con_font_get()
    26Monitor
  • CVE-2024-56676285 days apartthermal: testing: Initialize some variables annoteded with _free()
    22Monitor
  • CVE-2022-49217345 days apartscsi: pm8001: Fix abort all task initialization
    22Monitor

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-909 · Missing Initialization of 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 (9 more)

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

All records