Vulnerability in Kernel (CVE-2026-23214)

Summary

Vulnerability in Kernel (CVE-2026-23214). Risk of unauthorized operations or information disclosure. Mitigation: upgrade to 6.12.70, 6.18.10 or later.

Original description

The description as published by the source.

In the Linux kernel, the following vulnerability has been resolved:

btrfs: reject new transactions if the fs is fully read-only

[BUG]
There is a bug report where a heavily fuzzed fs is mounted with all
rescue mount options, which leads to the following warnings during
unmount:

BTRFS: Transaction aborted (error -22)
Modules linked in:
CPU: 0 UID: 0 PID: 9758 Comm: repro.out Not tainted
6.19.0-rc5-00002-gb71e635feefc #7 PREEMPT(full)
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014
RIP: 0010:find_free_extent_update_loop fs/btrfs/extent-tree.c:4208 [inline]
RIP: 0010:find_free_extent+0x52f0/0x5d20 fs/btrfs/extent-tree.c:4611
Call Trace:

btrfs_reserve_extent+0x2cd/0x790 fs/btrfs/extent-tree.c:4705
btrfs_alloc_tree_block+0x1e1/0x10e0 fs/btrfs/extent-tree.c:5157
btrfs_force_cow_block+0x578/0x2410 fs/btrfs/ctree.c:517
btrfs_cow_block+0x3c4/0xa80 fs/btrfs/ctree.c:708
btrfs_search_slot+0xcad/0x2b50 fs/btrfs/ctree.c:2130
btrfs_truncate_inode_items+0x45d/0x2350 fs/btrfs/inode-item.c:499
btrfs_evict_inode+0x923/0xe70 fs/btrfs/inode.c:5628
evict+0x5f4/0xae0 fs/inode.c:837
__dentry_kill+0x209/0x660 fs/dcache.c:670
finish_dput+0xc9/0x480 fs/dcache.c:879
shrink_dcache_for_umount+0xa0/0x170 fs/dcache.c:1661
generic_shutdown_super+0x67/0x2c0 fs/super.c:621
kill_anon_super+0x3b/0x70 fs/super.c:1289
btrfs_kill_super+0x41/0x50 fs/btrfs/super.c:2127
deactivate_locked_super+0xbc/0x130 fs/super.c:474…

Source: OSV.dev (Open Source Vulnerabilities) NVD OSV

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-2026-23214 has been found in Kernel.
Risk of unauthorized operations or information disclosure.
What to do: upgrade Kernel to 6.12.70, 6.18.10 or later.
If unsure, ask your IT team or search "Kernel CVE-2026-23214" on the vendor's site.

CVE-2026-23214 (Kernel)
Patched: 6.12.70, 6.18.10 — apply immediately
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.

❓ What is the problem

A vulnerability (unclassified) exists in Kernel.

📍 Affected scope

Check the vendor advisory for the affected versions of Kernel.

🔥 Severity

Severity: ?. Risk of unauthorized operations or information disclosure.

🔧 How to fix

Update to 6.12.70, 6.18.10.

🛡️ Workaround

Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.

🔍 Detection

Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r 'Kernel' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.

Response actions

Concrete steps and command examples for SOC/SRE teams to execute in order

1
Identify exposure identify
```
grep -r 'Kernel' . | grep -v node_modules
```
リポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で Kernel を grep し、稼働しているサービス・バージョンを把握する。
2
Apply patch patch
```
Upgrade Kernel to 6.12.70, 6.18.10
```
ステージング環境で 6.12.70, 6.18.10 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスを含めること。
3
Post-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

Linux Kernel

[{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"6.12.70"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.10"}]}]

Fix status by distribution

Fixed packages published by each distribution for this CVE

BellSoft Alpaquita BELL-CVE-2026-23214 linux-lts
Debian DEBIAN-CVE-2026-23214 linux
Ubuntu UBUNTU-CVE-2026-23214 linux