CVE-2024-26635

MEDIUMNVD 5.55.5—
EchelonGraph scoreMEDIUM confidence

Score 5.5 from GitHub Security Advisory published 2024-03-18. NVD baseline CVSS 5.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
5.5
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 5.5Exploit: NoneExposed: 0

A fix is available — apply it.

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

CVSS v3
5.5
EG Score
5.5(medium)
EG Risk
—
EPSS
15.5%
KEV
Not listed

Published

March 18, 2024

Last Modified

March 10, 2025

References (18)

Patch Availability(14)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulinux-virtual-hwe-20.04-edge (5.15.0.106.106) @ jammy2026-05-24ubuntu
ubuntulinux-tools-raspi-nolpae (5.15.0.1054.52) @ jammy2026-05-24ubuntu
ubuntulinux-tools-bluefield (5.4.0.1084.80) @ focal2026-05-24ubuntu
ubuntulinux-xilinx-zynqmp-tools-5.4.0-1043 (5.4.0-1043.47) @ focal2026-05-24ubuntu
ubuntulinux-tools-aws-lts-22.04 (5.15.0.1061.61) @ jammy2026-05-24ubuntu
ubuntulinux-virtual-hwe-16.04-edge (4.15.0.225.209) @ bionic2026-05-24ubuntu
ubuntulinux-virtual-lts-xenial (4.4.0.254.260) @ xenial2026-05-24ubuntu
ubuntulinux-tools-gke (4.15.0.1162.179~16.04.1) @ xenial2026-05-24ubuntu
ubuntulinux-tools-azure-edge (4.15.0.1177.192~16.04.1) @ xenial2026-05-24ubuntu
ubuntulinux-tools-aws-hwe (4.15.0.1168.181~16.04.1) @ xenial2026-05-24ubuntu
ubuntulinux-tools-intel-iotg (5.15.0.1057.57) @ jammy2026-05-24ubuntu
ubuntulinux-tools-intel-iotg-edge (5.15.0.1058.64~20.04.1) @ focal2026-05-24ubuntu
ubuntulinux-virtual-hwe-22.04-edge (6.5.0.35.35) @ mantic2026-05-24ubuntu
linuxKernel @ 4.19.307—osv

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

All Vendor Advisories

(13)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 10× in last 7d / 47× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 108 total refreshes for this CVE.

  1. 2026-07-22 14:07 UTCEPSS rescore
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Frequently asked(5)

What is CVE-2024-26635?
CVE-2024-26635 is a medium vulnerability published on March 18, 2024. In the Linux kernel, the following vulnerability has been resolved: llc: Drop support for ETHPTR8022. syzbot reported an uninit-value bug below. [0] llc supports ETHP8022 (0x0004) and used to support ETHPTR802_2 (0x0011), and syzbot abused the latter to trigger the bug. write$tun(r0,…
When was CVE-2024-26635 disclosed?
CVE-2024-26635 was first published in the National Vulnerability Database on March 18, 2024, with the most recent update on March 10, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2024-26635 actively exploited?
CVE-2024-26635 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 15.5% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2024-26635?
CVE-2024-26635 has a CVSS v3 base score of 5.5 (NVD).
How do I remediate CVE-2024-26635?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2024-26635, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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