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CVE-2026-23411— apparmor: fix race between freeing data and fs accessing it

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，该漏洞源于释放数据和文件系统访问数据之间存在竞争条件，可能导致释放后重用。

CVSS 7.8 · High EPSS 0.14% · P3

Possible ATT&CK Techniques 1 AI

T1205.001 · Port Knocking

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux c961ee5f21b202dea60b63eeef945730d92e46a6< a92c5e5086a87d082696245a8607666da3d80554 affected
c961ee5f21b202dea60b63eeef945730d92e46a6< 667df93769c02ff581c77d2d8f162147e719c557 affected
c961ee5f21b202dea60b63eeef945730d92e46a6< 3ddb961d2929bbb3204a2bba21b5d8153cd3f7cc affected
c961ee5f21b202dea60b63eeef945730d92e46a6< ae10787d955fb255d381e0d5589451dd72c614b1 affected
c961ee5f21b202dea60b63eeef945730d92e46a6< eecce026399917f6efa532c56bc7a3e9dd6ee68b affected
c961ee5f21b202dea60b63eeef945730d92e46a6< 13bc2772414d68e94e273dea013181a986948ddf affected
c961ee5f21b202dea60b63eeef945730d92e46a6< 2a732ed26fbd048e7925d227af8cf9ea43fb5cc9 affected
c961ee5f21b202dea60b63eeef945730d92e46a6< 8e135b8aee5a06c52a4347a5a6d51223c6f36ba3 affected
… +10 more rows
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I. Basic Information for CVE-2026-23411

Vulnerability Information
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Vulnerability Title
apparmor: fix race between freeing data and fs accessing it
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: apparmor: fix race between freeing data and fs accessing it AppArmor was putting the reference to i_private data on its end after removing the original entry from the file system. However the inode can aand does live beyond that point and it is possible that some of the fs call back functions will be invoked after the reference has been put, which results in a race between freeing the data and accessing it through the fs. While the rawdata/loaddata is the most likely candidate to fail the race, as it has the fewest references. If properly crafted it might be possible to trigger a race for the other types stored in i_private. Fix this by moving the put of i_private referenced data to the correct place which is during inode eviction.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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，该漏洞源于释放数据和文件系统访问数据之间存在竞争条件，可能导致释放后重用。
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 c961ee5f21b202dea60b63eeef945730d92e46a6 ~ a92c5e5086a87d082696245a8607666da3d80554 -
Linux Linux 4.13 -

II. Public POCs for CVE-2026-23411

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III. Intelligence Information for CVE-2026-23411

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Same Patch Batch · Linux · 2026-04-01 · 11 CVEs total

CVE-2026-23410 7.8 HIGH apparmor: fix race on rawdata dereference
CVE-2026-23408 7.8 HIGH apparmor: Fix double free of ns_name in aa_replace_profiles()
CVE-2026-23407 7.8 HIGH apparmor: fix missing bounds check on DEFAULT table in verify_dfa()
CVE-2026-23406 7.8 HIGH apparmor: fix side-effect bug in match_char() macro usage
CVE-2026-23409 apparmor: fix differential encoding verification
CVE-2026-23405 apparmor: fix: limit the number of levels of policy namespaces
CVE-2026-23404 apparmor: replace recursive profile removal with iterative approach
CVE-2026-23403 apparmor: fix memory leak in verify_header
CVE-2026-23402 KVM: x86/mmu: Only WARN in direct MMUs when overwriting shadow-present SPTE
CVE-2026-23401 KVM: x86/mmu: Drop/zap existing present SPTE even when creating an MMIO SPTE

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-23411

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