Vulnerability-Lookup

FKIE_CVE-2026-23413

Vulnerability from fkie_nvd - Published: 2026-04-02 12:16 - Updated: 2026-06-17 10:21

Severity

7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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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      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nclsact: Fix use-after-free in init/destroy rollback asymmetry\n\nFix a use-after-free in the clsact qdisc upon init/destroy rollback asymmetry.\nThe latter is achieved by first fully initializing a clsact instance, and\nthen in a second step having a replacement failure for the new clsact qdisc\ninstance. clsact_init() initializes ingress first and then takes care of the\negress part. This can fail midway, for example, via tcf_block_get_ext(). Upon\nfailure, the kernel will trigger the clsact_destroy() callback.\n\nCommit 1cb6f0bae504 (\"bpf: Fix too early release of tcx_entry\") details the\nway how the transition is happening. If tcf_block_get_ext on the q-\u003eingress_block\nends up failing, we took the tcx_miniq_inc reference count on the ingress\nside, but not yet on the egress side. clsact_destroy() tests whether the\n{ingress,egress}_entry was non-NULL. However, even in midway failure on the\nreplacement, both are in fact non-NULL with a valid egress_entry from the\nprevious clsact instance.\n\nWhat we really need to test for is whether the qdisc instance-specific ingress\nor egress side previously got initialized. This adds a small helper for checking\nthe miniq initialization called mini_qdisc_pair_inited, and utilizes that upon\nclsact_destroy() in order to fix the use-after-free scenario. Convert the\ningress_destroy() side as well so both are consistent to each other."
    }
  ],
  "id": "CVE-2026-23413",
  "lastModified": "2026-06-17T10:21:32.113",
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        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
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          "baseScore": 7.8,
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          "confidentialityImpact": "HIGH",
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  "published": "2026-04-02T12:16:20.440",
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}

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

Vulnerability from cvelistv5 – Published: 2026-04-02 11:40 – Updated: 2026-08-05 12:21

Title

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

Summary

Severity

7.8 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Assigner

Linux mitre root

References

5 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

2 products

Vendor	Product	Version
Linux	Linux	Affected: 230bb13650b0f186f540500fd5f5f7096a822a2a , < a73d95b57bf9faebdfed591bcb7ed9292062a84c (git) Affected: 1cb6f0bae50441f4b4b32a28315853b279c7404e , < 37bef86e5428d59f70a4da82b80f9a8f252fecbe (git) Affected: 1cb6f0bae50441f4b4b32a28315853b279c7404e , < 4c9af67f99aa3e51b522c54968ab3ac8272be41c (git) Affected: 1cb6f0bae50441f4b4b32a28315853b279c7404e , < 0509b762bc5e8ea7b8391130730c6d8502fc6e69 (git) Affected: 1cb6f0bae50441f4b4b32a28315853b279c7404e , < a0671125d4f55e1e98d9bde8a0b671941987e208 (git) Affected: f61ecf1bd5b562ebfd7d430ccb31619857e80857 (git) Affected: 6.6.41 , < 6.6.130 (semver) Affected: 6.9.10 , < 6.10 (semver)
Linux	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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      "affected": [
        {
          "defaultStatus": "unaffected",
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          "programFiles": [
            "include/net/sch_generic.h",
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        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nclsact: Fix use-after-free in init/destroy rollback asymmetry\n\nFix a use-after-free in the clsact qdisc upon init/destroy rollback asymmetry.\nThe latter is achieved by first fully initializing a clsact instance, and\nthen in a second step having a replacement failure for the new clsact qdisc\ninstance. clsact_init() initializes ingress first and then takes care of the\negress part. This can fail midway, for example, via tcf_block_get_ext(). Upon\nfailure, the kernel will trigger the clsact_destroy() callback.\n\nCommit 1cb6f0bae504 (\"bpf: Fix too early release of tcx_entry\") details the\nway how the transition is happening. If tcf_block_get_ext on the q-\u003eingress_block\nends up failing, we took the tcx_miniq_inc reference count on the ingress\nside, but not yet on the egress side. clsact_destroy() tests whether the\n{ingress,egress}_entry was non-NULL. However, even in midway failure on the\nreplacement, both are in fact non-NULL with a valid egress_entry from the\nprevious clsact instance.\n\nWhat we really need to test for is whether the qdisc instance-specific ingress\nor egress side previously got initialized. This adds a small helper for checking\nthe miniq initialization called mini_qdisc_pair_inited, and utilizes that upon\nclsact_destroy() in order to fix the use-after-free scenario. Convert the\ningress_destroy() side as well so both are consistent to each other."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The vulnerable `clsact` qdisc init/destroy path is reached through local rtnetlink `RTM_NEWQDISC` traffic, not by remote packets directly.\nAC:L - The failure path is attacker-controlled by creating/replacing `clsact` with shared block indexes so `tcf_block_get_ext()` fails during rollback; no uncontrollable race is required.\nPR:L - `RTM_NEWQDISC` requires `CAP_NET_ADMIN` in the target network namespace, and `tc`/qdisc operations are reachable by an unprivileged user via user+network namespaces.\nUI:N - After local access, exploitation only requires issuing crafted netlink/qdisc operations and does not require victim interaction.\nS:U - The bug is a standard kernel memory corruption issue within the same kernel security authority, not a VM or hardware isolation boundary escape.\nC:H - The bug is a use-after-free of `tcx_entry` state reachable through old `clsact` miniq callbacks, and UAF memory reuse can provide kernel memory disclosure primitives.\nI:H - The stale miniq pointer can lead to writes through freed/reallocated kernel memory, making control-flow or kernel data corruption defensible.\nA:H - The same UAF can be triggered into kernel crashes/oopses during qdisc/filter cleanup or callback paths, causing high availability impact."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:21:33.571Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/a73d95b57bf9faebdfed591bcb7ed9292062a84c"
        },
        {
          "url": "https://git.kernel.org/stable/c/37bef86e5428d59f70a4da82b80f9a8f252fecbe"
        },
        {
          "url": "https://git.kernel.org/stable/c/4c9af67f99aa3e51b522c54968ab3ac8272be41c"
        },
        {
          "url": "https://git.kernel.org/stable/c/0509b762bc5e8ea7b8391130730c6d8502fc6e69"
        },
        {
          "url": "https://git.kernel.org/stable/c/a0671125d4f55e1e98d9bde8a0b671941987e208"
        }
      ],
      "title": "clsact: Fix use-after-free in init/destroy rollback asymmetry",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-23413",
    "datePublished": "2026-04-02T11:40:54.384Z",
    "dateReserved": "2026-01-13T15:37:46.014Z",
    "dateUpdated": "2026-08-05T12:21:33.571Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

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Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

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FKIE_CVE-2026-23413

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

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