Vulnerability in Linux kernel (CVE-2026-98694)
Summary
Vulnerability in Linux kernel (CVE-2026-98694). Risk of unauthorized operations or information disclosure.
Original description
The description as published by the source.
In the Linux kernel, the following vulnerability has been resolved:
thunderbolt: Fix KASAN reported use-after-free when request is canceled
Alan reported that when doing stress testing sometimes KASAN notices
use-after-free during control channel operation (stripped down keeping
the relevant parts):
BUG: KASAN: slab-use-after-free in tb_cfg_request_sync+0x240/0x250 [thunderbolt]
Read of size 24 at addr ffff88811067f290 by task kworker/u40:2/1760
tb_cfg_request_sync+0x240/0x250 [thunderbolt]
tb_cfg_read_raw+0x367/0x510 [thunderbolt]
tb_cfg_read+0xec/0x240 [thunderbolt]
tb_port_get_link_generation+0x258/0x420 [thunderbolt]
tb_usb3_consumed_bandwidth+0x1c1/0x2c0 [thunderbolt]
tb_tunnel_consumed_bandwidth+0xfd/0x910 [thunderbolt]
tb_available_bandwidth+0x5f2/0xeb0 [thunderbolt]
tb_recalc_estimated_bandwidth+0x2a0/0x1bc0 [thunderbolt]
tb_handle_dp_bandwidth_request+0x1897/0x5e20 [thunderbolt]
process_one_work+0x675/0x1230
worker_thread+0x5e6/0xf70
kthread+0x365/0x470
ret_from_fork+0x54d/0x710
ret_from_fork_asm+0x1a/0x30
Allocated by task 1760:
__kmalloc_cache_noprof+0x1ee/0x550
tb_cfg_read_raw+0x1d3/0x510 [thunderbolt]
tb_cfg_read+0xec/0x240 [thunderbolt]
tb_port_get_link_generation+0x258/0x420 [thunderbolt]
tb_usb3_consumed_bandwidth+0x1c1/0x2c0 [thunderbolt]
tb_tunnel_consumed_bandwidth+0xfd/0x910 [thunderbolt]
tb_available_bandwidth+0x5f2/0xeb0 [thunderbolt]
tb_recalc_estimated_bandwidth+0x2a0/0x1bc0 [thunderbolt]
tb_ha…
Source: NIST National Vulnerability Database NVD GitHub Advisory
Auto-generated summary
Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.
A vulnerability tracked as CVE-2026-98694 has been found in Linux kernel.
Risk of unauthorized operations or information disclosure.
What to do: apply the vendor's official patched release.
If unsure, ask your IT team or search "Linux kernel CVE-2026-98694" on the vendor's site.
CVE-2026-98694 (Linux kernel)
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.
A vulnerability (unclassified) exists in Linux kernel.
Check the vendor advisory for the affected versions of Linux kernel.
Severity: ?. Risk of unauthorized operations or information disclosure.
Update to the patched release per vendor advisory.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Audit SBOM/dependencies to find affected services.
Response actions
Concrete steps and command examples for SOC/SRE teams to execute in order
-
1Identify exposure identify
Audit SBOM/dependencies for affected components.資産台帳・SBOM・依存マニフェストで Linux kernel を使っているサービスとバージョンを洗い出す。
-
2Post-deployment verification verify
Confirm patched version is live in productionパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。
Fix status by distribution
Fixed packages published by each distribution for this CVE
- Debian DEBIAN-CVE-2026-98694 linux
References
- web git.kernel.org
- web git.kernel.org
- web git.kernel.org
- web git.kernel.org
- web nvd.nist.gov
- web github.com