CVE-2026-45965 - Vulnerability Details

- apparmor: fix invalid deref of rawdata when export_binary is unset

Description

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

apparmor: fix invalid deref of rawdata when export_binary is unset

If the export_binary parameter is disabled on runtime, profiles that
were loaded before that will still have their rawdata stored in
apparmorfs, with a symbolic link to the rawdata on the policy
directory. When one of those profiles are replaced, the rawdata is set
to NULL, but when trying to resolve the symbolic links to rawdata for
that profile, it will try to dereference profile->rawdata->name when
profile->rawdata is now NULL causing an oops. Fix it by checking if
rawdata is set.

[ 168.653080] BUG: kernel NULL pointer dereference, address: 0000000000000088
[ 168.657420] #PF: supervisor read access in kernel mode
[ 168.660619] #PF: error_code(0x0000) - not-present page
[ 168.663613] PGD 0 P4D 0
[ 168.665450] Oops: Oops: 0000 [#1] SMP NOPTI
[ 168.667836] CPU: 1 UID: 0 PID: 1729 Comm: ls Not tainted 6.19.0-rc7+ #3 PREEMPT(voluntary)
[ 168.672308] Hardware name: QEMU Ubuntu 24.04 PC (i440FX + PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[ 168.679327] RIP: 0010:rawdata_get_link_base.isra.0+0x23/0x330
[ 168.682768] Code: 90 90 90 90 90 90 90 0f 1f 44 00 00 55 48 89 e5 41 57 41 56 41 55 41 54 53 48 83 ec 18 48 89 55 d0 48 85 ff 0f 84 e3 01 00 00 <48> 83 3c 25 88 00 00 00 00 0f 84 d4 01 00 00 49 89 f6 49 89 cc e8
[ 168.689818] RSP: 0018:ffffcdcb8200fb80 EFLAGS: 00010282
[ 168.690871] RAX: ffffffffaee74ec0 RBX: 0000000000000000 RCX: ffffffffb0120158
[ 168.692251] RDX: ffffcdcb8200fbe0 RSI: ffff88c187c9fa80 RDI: ffff88c186c98a80
[ 168.693593] RBP: ffffcdcb8200fbc0 R08: 0000000000000000 R09: 0000000000000000
[ 168.694941] R10: 0000000000000000 R11: 0000000000000000 R12: ffff88c186c98a80
[ 168.696289] R13: 00007fff005aaa20 R14: 0000000000000080 R15: ffff88c188f4fce0
[ 168.697637] FS: 0000790e81c58280(0000) GS:ffff88c20a957000(0000) knlGS:0000000000000000
[ 168.699227] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 168.700349] CR2: 0000000000000088 CR3: 000000012fd3e000 CR4: 0000000000350ef0
[ 168.701696] Call Trace:
[ 168.702325] <TASK>
[ 168.702995] rawdata_get_link_data+0x1c/0x30
[ 168.704145] vfs_readlink+0xd4/0x160
[ 168.705152] do_readlinkat+0x114/0x180
[ 168.706214] __x64_sys_readlink+0x1e/0x30
[ 168.708653] x64_sys_call+0x1d77/0x26b0
[ 168.709525] do_syscall_64+0x81/0x500
[ 168.710348] ? do_statx+0x72/0xb0
[ 168.711109] ? putname+0x3e/0x80
[ 168.711845] ? __x64_sys_statx+0xb7/0x100
[ 168.712711] ? x64_sys_call+0x10fc/0x26b0
[ 168.713577] ? do_syscall_64+0xbf/0x500
[ 168.714412] ? do_user_addr_fault+0x1d2/0x8d0
[ 168.715404] ? irqentry_exit+0xb2/0x740
[ 168.716359] ? exc_page_fault+0x90/0x1b0
[ 168.717307] entry_SYSCALL_64_after_hwframe+0x76/0x7e

Published: 2026-05-27

Score: n/a

EPSS: n/a

KEV: No

Impact:

Action:

Analysis

Impact

The vulnerability is a null pointer dereference in the AppArmor subsystem of the Linux kernel. When the export_binary flag is disabled, profiles that were previously loaded keep a rawdata entry in AppArmorFS pointing to a symbolic link. If such a profile is later replaced, the rawdata pointer is cleared to NULL, yet the kernel still attempts to read profile->rawdata->name while resolving that symbolic link. This results in a kernel oops and a system crash.

Affected Systems

Any Linux kernel that includes AppArmor and contains the pre‑fix logic is affected. The flaw applies to all distributions that ship a kernel version before the commit that introduced the fix (e.g., kernel 6.19.0-rc7 and earlier). The product is the Linux kernel.

Risk and Exploitability

No CVSS or EPSS score is publicly available, and the vulnerability is not listed in CISA KEV. Exploitation requires local or elevated privileges to manipulate AppArmor profiles and the export_binary setting. An attacker who can perform these actions can trigger a kernel crash, resulting in a denial‑of‑service condition, but the flaw does not grant arbitrary code execution.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

Linux

unaffected

Version	Status	Constraints
`1180b4c757aab5506f1be367000364dd5cf5cd02`	affected	< e6b2fc7e34d4e7ca6b8598c33a3d45d59e455d8d
`1180b4c757aab5506f1be367000364dd5cf5cd02`	affected	< 6d8c180c825cbc73eeffaa79591f8e142dacae70
`1180b4c757aab5506f1be367000364dd5cf5cd02`	affected	< 3c36b87fc2a4cf88eadea8cf13923bd2b4f9a3fa
`1180b4c757aab5506f1be367000364dd5cf5cd02`	affected	< b25298e89a297c42eb4c4d6f081d60375b820abb
`1180b4c757aab5506f1be367000364dd5cf5cd02`	affected	< 19f2e4055626a58842ddec3282ad4465a80c6625
`1180b4c757aab5506f1be367000364dd5cf5cd02`	affected	< 1d2b2b58fde9059a488bc25399e6c3d74e9b5548
`1180b4c757aab5506f1be367000364dd5cf5cd02`	affected	< 1432ab0774cba43e8111be39989ff226531a9bac
`1180b4c757aab5506f1be367000364dd5cf5cd02`	affected	< df9ac55abd18628bd8cff687ea043660532a3654

Linux

affected

Version	Status	Constraints
`4.17`	affected	—
`0`	unaffected	< 4.17
`5.10.252`	unaffected	≤ 5.10.*
`5.15.202`	unaffected	≤ 5.15.*
`6.1.165`	unaffected	≤ 6.1.*
`6.6.128`	unaffected	≤ 6.6.*
`6.12.75`	unaffected	≤ 6.12.*
`6.18.14`	unaffected	≤ 6.18.*
`6.19.4`	unaffected	≤ 6.19.*
`7.0`	unaffected	≤ *

No data.

Vendor Product Confidence Versions

Linux

Linux Kernel

99%

Version	Status	Scheme	Platform
`[1180b4c757aab5506f1be367000364dd5cf5cd02,e6b2fc7e34d4e7ca6b8598c33a3d45d59e455d8d)`	affected	code_commit	—
`[1180b4c757aab5506f1be367000364dd5cf5cd02,6d8c180c825cbc73eeffaa79591f8e142dacae70)`	affected	code_commit	—
`[1180b4c757aab5506f1be367000364dd5cf5cd02,3c36b87fc2a4cf88eadea8cf13923bd2b4f9a3fa)`	affected	code_commit	—
`[1180b4c757aab5506f1be367000364dd5cf5cd02,b25298e89a297c42eb4c4d6f081d60375b820abb)`	affected	code_commit	—
`[1180b4c757aab5506f1be367000364dd5cf5cd02,19f2e4055626a58842ddec3282ad4465a80c6625)`	affected	code_commit	—
`[1180b4c757aab5506f1be367000364dd5cf5cd02,1d2b2b58fde9059a488bc25399e6c3d74e9b5548)`	affected	code_commit	—
`[1180b4c757aab5506f1be367000364dd5cf5cd02,1432ab0774cba43e8111be39989ff226531a9bac)`	affected	code_commit	—
`[1180b4c757aab5506f1be367000364dd5cf5cd02,df9ac55abd18628bd8cff687ea043660532a3654)`	affected	code_commit	—

Linux

Linux Kernel

99%

Version	Status	Scheme	Platform
`4.17`	affected	generic	—
`[0,4.17)`	unaffected	semver	—
`[5.10.252,5.11.0)`	unaffected	semver	—
`[5.15.202,5.16.0)`	unaffected	semver	—
`[6.1.165,6.2.0)`	unaffected	semver	—
`[6.6.128,6.7.0)`	unaffected	semver	—
`[6.12.75,6.13.0)`	unaffected	semver	—
`[6.18.14,6.19.0)`	unaffected	semver	—
`[6.19.4,6.20.0)`	unaffected	semver	—
`[7.0,*]`	unaffected	generic	—

Found an issue or want to improve our Enrichment? You can suggest it directly by opening an issue on our dedicated GitHub repository .

Remediation

No vendor fix or workaround currently provided.

OpenCVE Recommended Actions

Upgrade the Linux kernel to a version that includes the AppArmor patch (e.g., 6.19.1 or later).
If an immediate upgrade is not possible, ensure that the AppArmor export_binary parameter remains enabled when loading or updating profiles to avoid the null dereference.
Continuously monitor kernel logs for Oops messages and reboot the system when a crash occurs to restore service temporarily.

Generated by OpenCVE AI on May 27, 2026 at 18:51 UTC.

Tracking

Sign in to view the affected projects.

Advisories

No advisories yet.

No CVSS v4.0

No CVSS v3.1

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

References

Link	Providers
https://git.kernel.org/stable/c/1432ab0774cba43e8111be39989ff226531a9bac
https://git.kernel.org/stable/c/19f2e4055626a58842ddec3282ad4465a80c6625
https://git.kernel.org/stable/c/1d2b2b58fde9059a488bc25399e6c3d74e9b5548
https://git.kernel.org/stable/c/3c36b87fc2a4cf88eadea8cf13923bd2b4f9a3fa
https://git.kernel.org/stable/c/6d8c180c825cbc73eeffaa79591f8e142dacae70
https://git.kernel.org/stable/c/b25298e89a297c42eb4c4d6f081d60375b820abb
https://git.kernel.org/stable/c/df9ac55abd18628bd8cff687ea043660532a3654
https://git.kernel.org/stable/c/e6b2fc7e34d4e7ca6b8598c33a3d45d59e455d8d

History

Wed, 27 May 2026 19:15:00 +0000

Type	Values Removed	Values Added
Weaknesses		CWE-476

Wed, 27 May 2026 14:15:00 +0000

Type	Values Removed	Values Added
Description		In the Linux kernel, the following vulnerability has been resolved: apparmor: fix invalid deref of rawdata when export_binary is unset If the export_binary parameter is disabled on runtime, profiles that were loaded before that will still have their rawdata stored in apparmorfs, with a symbolic link to the rawdata on the policy directory. When one of those profiles are replaced, the rawdata is set to NULL, but when trying to resolve the symbolic links to rawdata for that profile, it will try to dereference profile->rawdata->name when profile->rawdata is now NULL causing an oops. Fix it by checking if rawdata is set. [ 168.653080] BUG: kernel NULL pointer dereference, address: 0000000000000088 [ 168.657420] #PF: supervisor read access in kernel mode [ 168.660619] #PF: error_code(0x0000) - not-present page [ 168.663613] PGD 0 P4D 0 [ 168.665450] Oops: Oops: 0000 [#1] SMP NOPTI [ 168.667836] CPU: 1 UID: 0 PID: 1729 Comm: ls Not tainted 6.19.0-rc7+ #3 PREEMPT(voluntary) [ 168.672308] Hardware name: QEMU Ubuntu 24.04 PC (i440FX + PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 168.679327] RIP: 0010:rawdata_get_link_base.isra.0+0x23/0x330 [ 168.682768] Code: 90 90 90 90 90 90 90 0f 1f 44 00 00 55 48 89 e5 41 57 41 56 41 55 41 54 53 48 83 ec 18 48 89 55 d0 48 85 ff 0f 84 e3 01 00 00 <48> 83 3c 25 88 00 00 00 00 0f 84 d4 01 00 00 49 89 f6 49 89 cc e8 [ 168.689818] RSP: 0018:ffffcdcb8200fb80 EFLAGS: 00010282 [ 168.690871] RAX: ffffffffaee74ec0 RBX: 0000000000000000 RCX: ffffffffb0120158 [ 168.692251] RDX: ffffcdcb8200fbe0 RSI: ffff88c187c9fa80 RDI: ffff88c186c98a80 [ 168.693593] RBP: ffffcdcb8200fbc0 R08: 0000000000000000 R09: 0000000000000000 [ 168.694941] R10: 0000000000000000 R11: 0000000000000000 R12: ffff88c186c98a80 [ 168.696289] R13: 00007fff005aaa20 R14: 0000000000000080 R15: ffff88c188f4fce0 [ 168.697637] FS: 0000790e81c58280(0000) GS:ffff88c20a957000(0000) knlGS:0000000000000000 [ 168.699227] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 168.700349] CR2: 0000000000000088 CR3: 000000012fd3e000 CR4: 0000000000350ef0 [ 168.701696] Call Trace: [ 168.702325] <TASK> [ 168.702995] rawdata_get_link_data+0x1c/0x30 [ 168.704145] vfs_readlink+0xd4/0x160 [ 168.705152] do_readlinkat+0x114/0x180 [ 168.706214] __x64_sys_readlink+0x1e/0x30 [ 168.708653] x64_sys_call+0x1d77/0x26b0 [ 168.709525] do_syscall_64+0x81/0x500 [ 168.710348] ? do_statx+0x72/0xb0 [ 168.711109] ? putname+0x3e/0x80 [ 168.711845] ? __x64_sys_statx+0xb7/0x100 [ 168.712711] ? x64_sys_call+0x10fc/0x26b0 [ 168.713577] ? do_syscall_64+0xbf/0x500 [ 168.714412] ? do_user_addr_fault+0x1d2/0x8d0 [ 168.715404] ? irqentry_exit+0xb2/0x740 [ 168.716359] ? exc_page_fault+0x90/0x1b0 [ 168.717307] entry_SYSCALL_64_after_hwframe+0x76/0x7e
Title		apparmor: fix invalid deref of rawdata when export_binary is unset
First Time appeared		Linux Linux linux Kernel
CPEs		cpe:2.3:o:linux:linux_kernel::::::::
Vendors & Products		Linux Linux linux Kernel
References		https://git.kernel.org/stable/c/1432ab0774cba43e8111be39989ff226531a9bac https://git.kernel.org/stable/c/19f2e4055626a58842ddec3282ad4465a80c6625 https://git.kernel.org/stable/c/1d2b2b58fde9059a488bc25399e6c3d74e9b5548 https://git.kernel.org/stable/c/3c36b87fc2a4cf88eadea8cf13923bd2b4f9a3fa https://git.kernel.org/stable/c/6d8c180c825cbc73eeffaa79591f8e142dacae70 https://git.kernel.org/stable/c/b25298e89a297c42eb4c4d6f081d60375b820abb https://git.kernel.org/stable/c/df9ac55abd18628bd8cff687ea043660532a3654 https://git.kernel.org/stable/c/e6b2fc7e34d4e7ca6b8598c33a3d45d59e455d8d

Subscriptions

Linux Linux Kernel

MITRE

Status: PUBLISHED

Assigner: Linux

Published: 2026-05-27T12:18:23.170Z

Updated: 2026-05-27T12:18:23.170Z

Reserved: 2026-05-13T15:03:33.089Z

Link: CVE-2026-45965

Vulnrichment

No data.

NVD

Status : Awaiting Analysis

Published: 2026-05-27T14:17:13.307

Modified: 2026-05-27T14:48:03.013

Link: CVE-2026-45965

Redhat

No data.

OpenCVE Enrichment

Updated: 2026-05-27T20:30:40Z

Weaknesses

CWE-476

Impact

Affected Systems

Risk and Exploitability

Tracking

Subscriptions

JSON object

JSON object

JSON object

JSON object

JSON object