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CVE-2026-23269— apparmor: validate DFA start states are in bounds in unpack_pdb

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于未验证DFA起始状态边界，可能导致越界读取。

CVSS 7.1 · High EPSS 0.14% · P3

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux ad5ff3db53c68c2f12936bc74ea5dfe0af943592< f43eea8ae0102ea198da211ef7f5ce83725ecf19 affected
ad5ff3db53c68c2f12936bc74ea5dfe0af943592< 5487871b2b56c19d26936ed6fdc62652b30941df affected
ad5ff3db53c68c2f12936bc74ea5dfe0af943592< 5443c027ec16afa55b1b8a3e7a1ab2ea3c77767a affected
ad5ff3db53c68c2f12936bc74ea5dfe0af943592< 07cf6320f40ea2ccfad63728cff34ecb309d03da affected
ad5ff3db53c68c2f12936bc74ea5dfe0af943592< 15c3eb8916e7db01cb246d04a1fe6f0fdc065b0c affected
ad5ff3db53c68c2f12936bc74ea5dfe0af943592< 0baadb0eece2c4d939db10d3c323b4652ac79a58 affected
ad5ff3db53c68c2f12936bc74ea5dfe0af943592< 3bb7db43e32190c973d4019037cedb7895920184 affected
ad5ff3db53c68c2f12936bc74ea5dfe0af943592< 9063d7e2615f4a7ab321de6b520e23d370e58816 affected
… +10 more rows
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I. Basic Information for CVE-2026-23269

Vulnerability Information
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Vulnerability Title
apparmor: validate DFA start states are in bounds in unpack_pdb
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: apparmor: validate DFA start states are in bounds in unpack_pdb Start states are read from untrusted data and used as indexes into the DFA state tables. The aa_dfa_next() function call in unpack_pdb() will access dfa->tables[YYTD_ID_BASE][start], and if the start state exceeds the number of states in the DFA, this results in an out-of-bound read. ================================================================== BUG: KASAN: slab-out-of-bounds in aa_dfa_next+0x2a1/0x360 Read of size 4 at addr ffff88811956fb90 by task su/1097 ... Reject policies with out-of-bounds start states during unpacking to prevent the issue.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于未验证DFA起始状态边界，可能导致越界读取。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux ad5ff3db53c68c2f12936bc74ea5dfe0af943592 ~ f43eea8ae0102ea198da211ef7f5ce83725ecf19 -
Linux Linux 3.4 -

II. Public POCs for CVE-2026-23269

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III. Intelligence Information for CVE-2026-23269

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Patches & Fixes for CVE-2026-23269 (5)

Same Patch Batch · Linux · 2026-03-18 · 35 CVEs total

CVE-2026-23246 8.8 HIGH wifi: mac80211: bounds-check link_id in ieee80211_ml_reconfiguration
CVE-2026-23268 7.8 HIGH apparmor: fix unprivileged local user can do privileged policy management
CVE-2026-23243 7.8 HIGH RDMA/umad: Reject negative data_len in ib_umad_write
CVE-2026-23245 7.8 HIGH net/sched: act_gate: snapshot parameters with RCU on replace
CVE-2026-23248 7.8 HIGH perf/core: Fix refcount bug and potential UAF in perf_mmap
CVE-2026-23253 7.8 HIGH media: dvb-core: fix wrong reinitialization of ringbuffer on reopen
CVE-2026-23270 7.8 HIGH net/sched: Only allow act_ct to bind to clsact/ingress qdiscs and shared blocks
CVE-2025-71269 7.5 HIGH btrfs: do not free data reservation in fallback from inline due to -ENOSPC
CVE-2026-23242 7.5 HIGH RDMA/siw: Fix potential NULL pointer dereference in header processing
CVE-2025-71268 7.5 HIGH btrfs: fix reservation leak in some error paths when inserting inline extent
CVE-2026-23250 xfs: check return value of xchk_scrub_create_subord
CVE-2025-71265 fs: ntfs3: fix infinite loop in attr_load_runs_range on inconsistent metadata
CVE-2025-71266 fs: ntfs3: check return value of indx_find to avoid infinite loop
CVE-2025-71267 fs: ntfs3: fix infinite loop triggered by zero-sized ATTR_LIST
CVE-2026-23267 f2fs: fix IS_CHECKPOINTED flag inconsistency issue caused by concurrent atomic commit and
CVE-2026-23266 fbdev: rivafb: fix divide error in nv3_arb()
CVE-2026-23265 f2fs: fix to do sanity check on node footer in {read,write}_end_io
CVE-2026-23244 nvme: fix memory allocation in nvme_pr_read_keys()
CVE-2026-23264 Revert "drm/amd: Check if ASPM is enabled from PCIe subsystem"
CVE-2026-23247 tcp: secure_seq: add back ports to TS offset

Showing top 20 of 35 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-23269

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