Vulnerability-Lookup

FKIE_CVE-2026-23403

Vulnerability from fkie_nvd - Published: 2026-04-01 09:16 - Updated: 2026-04-24 18:39

Severity ?

5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Summary

In the Linux kernel, the following vulnerability has been resolved: apparmor: fix memory leak in verify_header The function sets `*ns = NULL` on every call, leaking the namespace string allocated in previous iterations when multiple profiles are unpacked. This also breaks namespace consistency checking since *ns is always NULL when the comparison is made. Remove the incorrect assignment. The caller (aa_unpack) initializes *ns to NULL once before the loop, which is sufficient.

References

URL	Tags
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/42fd831abfc15d0643c14688f0522556b347e7e6	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/4f0889f2df1ab99224a5e1ac4e20437eea5fe38e	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/663ce34786e759ebcbeb3060685c20bcc886d51a	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/6b79abcb3c985e153fcf9d395e1d4336081aabc2	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/786e2c2a87d9c505f33321d1fd23a176aa8ddeb1	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/9d678eb0fe55c9195d9a253e8c5b82a87b930737	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/bcf82c0c5a8b383fd2d5d8f3fd880cdcab2ac557	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/e38c55d9f834e5b848bfed0f5c586aaf45acb825	Patch

Impacted products

Vendor	Product	Version
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	3.12
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0

JSON

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    }
  ],
  "id": "CVE-2026-23403",
  "lastModified": "2026-04-24T18:39:58.850",
  "metrics": {
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          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 5.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
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}

CVE-2026-23403 (GCVE-0-2026-23403)

Vulnerability from cvelistv5 – Published: 2026-04-01 08:36 – Updated: 2026-04-18 08:58

Title

apparmor: fix memory leak in verify_header

Summary

Severity ?

No CVSS data available.

Assigner

Linux

References

URL

Tags

	https://git.kernel.org/stable/c/9d678eb0fe55c9195…
	https://git.kernel.org/stable/c/6b79abcb3c985e153…
	https://git.kernel.org/stable/c/bcf82c0c5a8b383fd…
	https://git.kernel.org/stable/c/663ce34786e759ebc…
	https://git.kernel.org/stable/c/786e2c2a87d9c505f…
	https://git.kernel.org/stable/c/4f0889f2df1ab9922…
	https://git.kernel.org/stable/c/42fd831abfc15d064…
	https://git.kernel.org/stable/c/e38c55d9f834e5b84…

Impacted products

Vendor

Product

Version

Linux

Affected: dd51c84857630e77c139afe4d9bba65fc051dc3f , < 9d678eb0fe55c9195d9a253e8c5b82a87b930737 (git)
Affected: dd51c84857630e77c139afe4d9bba65fc051dc3f , < 6b79abcb3c985e153fcf9d395e1d4336081aabc2 (git)
Affected: dd51c84857630e77c139afe4d9bba65fc051dc3f , < bcf82c0c5a8b383fd2d5d8f3fd880cdcab2ac557 (git)
Affected: dd51c84857630e77c139afe4d9bba65fc051dc3f , < 663ce34786e759ebcbeb3060685c20bcc886d51a (git)
Affected: dd51c84857630e77c139afe4d9bba65fc051dc3f , < 786e2c2a87d9c505f33321d1fd23a176aa8ddeb1 (git)
Affected: dd51c84857630e77c139afe4d9bba65fc051dc3f , < 4f0889f2df1ab99224a5e1ac4e20437eea5fe38e (git)
Affected: dd51c84857630e77c139afe4d9bba65fc051dc3f , < 42fd831abfc15d0643c14688f0522556b347e7e6 (git)
Affected: dd51c84857630e77c139afe4d9bba65fc051dc3f , < e38c55d9f834e5b848bfed0f5c586aaf45acb825 (git)

Linux

Affected: 3.12
Unaffected: 0 , < 3.12 (semver)
Unaffected: 5.10.253 , ≤ 5.10.* (semver)
Unaffected: 5.15.203 , ≤ 5.15.* (semver)
Unaffected: 6.1.169 , ≤ 6.1.* (semver)
Unaffected: 6.6.130 , ≤ 6.6.* (semver)
Unaffected: 6.12.77 , ≤ 6.12.* (semver)
Unaffected: 6.18.18 , ≤ 6.18.* (semver)
Unaffected: 6.19.8 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "security/apparmor/policy_unpack.c"
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      "title": "apparmor: fix memory leak in verify_header",
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  "cveMetadata": {
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    "datePublished": "2026-04-01T08:36:34.269Z",
    "dateReserved": "2026-01-13T15:37:46.012Z",
    "dateUpdated": "2026-04-18T08:58:36.504Z",
    "state": "PUBLISHED"
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}

Sightings

Author	Source	Type	Date

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

FKIE_CVE-2026-23403

CVE-2026-23403 (GCVE-0-2026-23403)

Tags

Sightings

Nomenclature