Vulnerability-Lookup

FKIE_CVE-2026-23413

Vulnerability from fkie_nvd - Published: 2026-04-02 12:16 - Updated: 2026-04-24 15:22

Severity ?

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

Summary

In the Linux kernel, the following vulnerability has been resolved: clsact: Fix use-after-free in init/destroy rollback asymmetry Fix a use-after-free in the clsact qdisc upon init/destroy rollback asymmetry. The latter is achieved by first fully initializing a clsact instance, and then in a second step having a replacement failure for the new clsact qdisc instance. clsact_init() initializes ingress first and then takes care of the egress part. This can fail midway, for example, via tcf_block_get_ext(). Upon failure, the kernel will trigger the clsact_destroy() callback. Commit 1cb6f0bae504 ("bpf: Fix too early release of tcx_entry") details the way how the transition is happening. If tcf_block_get_ext on the q->ingress_block ends up failing, we took the tcx_miniq_inc reference count on the ingress side, but not yet on the egress side. clsact_destroy() tests whether the {ingress,egress}_entry was non-NULL. However, even in midway failure on the replacement, both are in fact non-NULL with a valid egress_entry from the previous clsact instance. What we really need to test for is whether the qdisc instance-specific ingress or egress side previously got initialized. This adds a small helper for checking the miniq initialization called mini_qdisc_pair_inited, and utilizes that upon clsact_destroy() in order to fix the use-after-free scenario. Convert the ingress_destroy() side as well so both are consistent to each other.

References

URL	Tags
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/0509b762bc5e8ea7b8391130730c6d8502fc6e69	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/37bef86e5428d59f70a4da82b80f9a8f252fecbe	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/4c9af67f99aa3e51b522c54968ab3ac8272be41c	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/a0671125d4f55e1e98d9bde8a0b671941987e208	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/a73d95b57bf9faebdfed591bcb7ed9292062a84c	Patch

Impacted products

Vendor	Product	Version
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	6.10
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

To clipboard

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CVE-2026-23413 (GCVE-0-2026-23413)

Vulnerability from cvelistv5 – Published: 2026-04-02 11:40 – Updated: 2026-04-13 06:06

Title

clsact: Fix use-after-free in init/destroy rollback asymmetry

Summary

Severity ?

No CVSS data available.

Assigner

Linux

References

URL

Tags

	https://git.kernel.org/stable/c/a73d95b57bf9faebd…
	https://git.kernel.org/stable/c/37bef86e5428d59f7…
	https://git.kernel.org/stable/c/4c9af67f99aa3e51b…
	https://git.kernel.org/stable/c/0509b762bc5e8ea7b…
	https://git.kernel.org/stable/c/a0671125d4f55e1e9…

Impacted products

Vendor

Product

Version

Linux

Affected: 230bb13650b0f186f540500fd5f5f7096a822a2a , < a73d95b57bf9faebdfed591bcb7ed9292062a84c (git)
Affected: 1cb6f0bae50441f4b4b32a28315853b279c7404e , < 37bef86e5428d59f70a4da82b80f9a8f252fecbe (git)
Affected: 1cb6f0bae50441f4b4b32a28315853b279c7404e , < 4c9af67f99aa3e51b522c54968ab3ac8272be41c (git)
Affected: 1cb6f0bae50441f4b4b32a28315853b279c7404e , < 0509b762bc5e8ea7b8391130730c6d8502fc6e69 (git)
Affected: 1cb6f0bae50441f4b4b32a28315853b279c7404e , < a0671125d4f55e1e98d9bde8a0b671941987e208 (git)
Affected: f61ecf1bd5b562ebfd7d430ccb31619857e80857 (git)

Linux

Affected: 6.10
Unaffected: 0 , < 6.10 (semver)
Unaffected: 6.6.130 , ≤ 6.6.* (semver)
Unaffected: 6.12.78 , ≤ 6.12.* (semver)
Unaffected: 6.18.20 , ≤ 6.18.* (semver)
Unaffected: 6.19.10 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

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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-2026-23413

CVE-2026-23413 (GCVE-0-2026-23413)

Tags

Sightings

Nomenclature