Use-After-Free in Linux kernel (CVE-2025-38106)
Summary
Vulnerability in Linux kernel (CVE-2025-38106). Successful exploitation can lead to full system takeover.
Original description
The description as published by the source.
In the Linux kernel, the following vulnerability has been resolved:
io_uring: fix use-after-free of sq->thread in __io_uring_show_fdinfo()
syzbot reports:
BUG: KASAN: slab-use-after-free in getrusage+0x1109/0x1a60
Read of size 8 at addr ffff88810de2d2c8 by task a.out/304
CPU: 0 UID: 0 PID: 304 Comm: a.out Not tainted 6.16.0-rc1 #1 PREEMPT(voluntary)
Hardware name: QEMU Ubuntu 24.04 PC (i440FX + PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
Call Trace:
dump_stack_lvl+0x53/0x70
print_report+0xd0/0x670
? __pfx__raw_spin_lock_irqsave+0x10/0x10
? getrusage+0x1109/0x1a60
kasan_report+0xce/0x100
? getrusage+0x1109/0x1a60
getrusage+0x1109/0x1a60
? __pfx_getrusage+0x10/0x10
__io_uring_show_fdinfo+0x9fe/0x1790
? ksys_read+0xf7/0x1c0
? do_syscall_64+0xa4/0x260
? vsnprintf+0x591/0x1100
? __pfx___io_uring_show_fdinfo+0x10/0x10
? __pfx_vsnprintf+0x10/0x10
? mutex_trylock+0xcf/0x130
? __pfx_mutex_trylock+0x10/0x10
? __pfx_show_fd_locks+0x10/0x10
? io_uring_show_fdinfo+0x57/0x80
io_uring_show_fdinfo+0x57/0x80
seq_show+0x38c/0x690
seq_read_iter+0x3f7/0x1180
? inode_set_ctime_current+0x160/0x4b0
seq_read+0x271/0x3e0
? __pfx_seq_read+0x10/0x10
? __pfx__raw_spin_lock+0x10/0x10
? __mark_inode_dirty+0x402/0x810
? selinux_file_permission+0x368/0x500
? file_update_time+0x10f/0x160
vfs_read+0x177/0xa40
? __pfx___handle_mm_fault+0x10/0x10
? __pfx_vfs_read+0x10/0x10
? mutex_lock+0x81/0xe0
? __pfx_mutex_lock+0x10/0x10
? fdget_pos+0x24d/0x4b0
ksys_read+0xf7/…
Source: NIST National Vulnerability Database NVD
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-2025-38106 has been found in Linux kernel.
Successful exploitation can lead to full system takeover. CVSS score: 7.8/10.
What to do: apply the vendor's official patched release.
If unsure, ask your IT team or search "Linux kernel CVE-2025-38106" on the vendor's site.
CVE-2025-38106 (Linux kernel) — CWE-416 / CVSS v3 7.8
Attack vector: local / no user interaction
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.
Use-after-free (CWE-416) exists in Linux kernel.
Check the vendor advisory for the affected versions of Linux kernel.
Severity: High (CVSS 7.8/10). Successful exploitation can lead to full system takeover.
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。
Affected packages
Fix status by distribution
Fixed packages published by each distribution for this CVE
- BellSoft Alpaquita BELL-CVE-2025-38106 linux-lts Fixed in: 6.12.41-r0
- Debian DEBIAN-CVE-2025-38106 linux Fixed in: 6.12.35-1
- Ubuntu UBUNTU-CVE-2025-38106 linux-hwe-edge
References
- advisory github.com
- advisory nvd.nist.gov
- package git.kernel.org
- web git.kernel.org
- web git.kernel.org
- web git.kernel.org