Vulnerability-Lookup

GHSA-2HJ8-22XR-W775

Vulnerability from github – Published: 2026-08-15 06:32 – Updated: 2026-08-17 06:33

Details

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

afs: Fix netns teardown to cancel the preallocation charger

Fix the teardown of an afs network namespace to make sure it cancels the work item that keeps the preallocated rxrpc call/conn/peer queue charged before incoming calls are disabled (i.e. listen 0).

Also, if net->live is false because the afs netns is being deleted, make afs_charge_preallocation() skip charging and make afs_rx_new_call() avoid requeuing the charger.

(This was found by AI review).

Severity

9.8 (Critical)


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

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{
  "affected": [],
  "aliases": [
    "CVE-2026-74427"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-15T06:22:44Z",
    "severity": "CRITICAL"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nafs: Fix netns teardown to cancel the preallocation charger\n\nFix the teardown of an afs network namespace to make sure it cancels the\nwork item that keeps the preallocated rxrpc call/conn/peer queue charged\nbefore incoming calls are disabled (i.e. listen 0).\n\nAlso, if net-\u003elive is false because the afs netns is being deleted, make\nafs_charge_preallocation() skip charging and make afs_rx_new_call() avoid\nrequeuing the charger.\n\n(This was found by AI review).",
  "id": "GHSA-2hj8-22xr-w775",
  "modified": "2026-08-17T06:33:44Z",
  "published": "2026-08-15T06:32:34Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-74427"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/47694fbc9d24ab6bf210f91e8efe06a10a478064"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/59e8b7652f6cbfb62d377ead0ad553c1b4e39a7a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/63ccaf1bdf8be2330f47f9b5b233dd3fd04acbd9"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/85d5fb80fe4f0cc836b6df83f26de204fe102ff7"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a33975ff2b6ea47b8f29956403374b1cdd057539"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b83ecf80e28afb7b6595ba79932e77ca68a5a83d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/eec89c5f8e1adc1de4824042ef75f62aed804153"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f5096e18b6b7fbd1c2a1942e275a51bcfdfb2ad1"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-74427 (GCVE-0-2026-74427)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:59 – Updated: 2026-08-17 05:47

Title

afs: Fix netns teardown to cancel the preallocation charger

Summary

In the Linux kernel, the following vulnerability has been resolved: afs: Fix netns teardown to cancel the preallocation charger Fix the teardown of an afs network namespace to make sure it cancels the work item that keeps the preallocated rxrpc call/conn/peer queue charged before incoming calls are disabled (i.e. listen 0). Also, if net->live is false because the afs netns is being deleted, make afs_charge_preallocation() skip charging and make afs_rx_new_call() avoid requeuing the charger. (This was found by AI review).

Severity

9.8 (Critical)


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

Assigner

Linux CNA under the mitre root

CNA scorecard D 54/100 over 6618 records in the last 180 days details

References

8 references

URL	Tags
https://git.kernel.org/stable/c/63ccaf1bdf8be2330…
https://git.kernel.org/stable/c/f5096e18b6b7fbd1c…
https://git.kernel.org/stable/c/59e8b7652f6cbfb62…
https://git.kernel.org/stable/c/85d5fb80fe4f0cc83…
https://git.kernel.org/stable/c/a33975ff2b6ea47b8…
https://git.kernel.org/stable/c/b83ecf80e28afb7b6…
https://git.kernel.org/stable/c/eec89c5f8e1adc1de…
https://git.kernel.org/stable/c/47694fbc9d24ab6bf…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 00e907127e6f86d0f9b122d9b4347a8aa09a8b61 , < 63ccaf1bdf8be2330f47f9b5b233dd3fd04acbd9 (git) Affected: 00e907127e6f86d0f9b122d9b4347a8aa09a8b61 , < f5096e18b6b7fbd1c2a1942e275a51bcfdfb2ad1 (git) Affected: 00e907127e6f86d0f9b122d9b4347a8aa09a8b61 , < 59e8b7652f6cbfb62d377ead0ad553c1b4e39a7a (git) Affected: 00e907127e6f86d0f9b122d9b4347a8aa09a8b61 , < 85d5fb80fe4f0cc836b6df83f26de204fe102ff7 (git) Affected: 00e907127e6f86d0f9b122d9b4347a8aa09a8b61 , < a33975ff2b6ea47b8f29956403374b1cdd057539 (git) Affected: 00e907127e6f86d0f9b122d9b4347a8aa09a8b61 , < b83ecf80e28afb7b6595ba79932e77ca68a5a83d (git) Affected: 00e907127e6f86d0f9b122d9b4347a8aa09a8b61 , < eec89c5f8e1adc1de4824042ef75f62aed804153 (git) Affected: 00e907127e6f86d0f9b122d9b4347a8aa09a8b61 , < 47694fbc9d24ab6bf210f91e8efe06a10a478064 (git)
Linux	Linux	Affected: 4.9 Unaffected: 0 , < 4.9 (semver) Unaffected: 5.10.261 , ≤ 5.10.* (semver) Unaffected: 5.15.212 , ≤ 5.15.* (semver) Unaffected: 6.1.178 , ≤ 6.1.* (semver) Unaffected: 6.6.145 , ≤ 6.6.* (semver) Unaffected: 6.12.97 , ≤ 6.12.* (semver) Unaffected: 6.18.40 , ≤ 6.18.* (semver) Unaffected: 7.1.5 , ≤ 7.1.* (semver) Unaffected: 7.2 , ≤ * (original_commit_for_fix)

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JSON

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/afs/rxrpc.c"
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          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "status": "affected",
              "version": "00e907127e6f86d0f9b122d9b4347a8aa09a8b61",
              "versionType": "git"
            },
            {
              "lessThan": "f5096e18b6b7fbd1c2a1942e275a51bcfdfb2ad1",
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              "version": "00e907127e6f86d0f9b122d9b4347a8aa09a8b61",
              "versionType": "git"
            },
            {
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              "status": "affected",
              "version": "00e907127e6f86d0f9b122d9b4347a8aa09a8b61",
              "versionType": "git"
            },
            {
              "lessThan": "85d5fb80fe4f0cc836b6df83f26de204fe102ff7",
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              "version": "00e907127e6f86d0f9b122d9b4347a8aa09a8b61",
              "versionType": "git"
            },
            {
              "lessThan": "a33975ff2b6ea47b8f29956403374b1cdd057539",
              "status": "affected",
              "version": "00e907127e6f86d0f9b122d9b4347a8aa09a8b61",
              "versionType": "git"
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            {
              "lessThan": "b83ecf80e28afb7b6595ba79932e77ca68a5a83d",
              "status": "affected",
              "version": "00e907127e6f86d0f9b122d9b4347a8aa09a8b61",
              "versionType": "git"
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            {
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              "status": "affected",
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              "versionType": "git"
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          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.9"
            },
            {
              "lessThan": "4.9",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.261",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.212",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.178",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.145",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.97",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.40",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.5",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
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          "nodes": [
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                {
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nafs: Fix netns teardown to cancel the preallocation charger\n\nFix the teardown of an afs network namespace to make sure it cancels the\nwork item that keeps the preallocated rxrpc call/conn/peer queue charged\nbefore incoming calls are disabled (i.e. listen 0).\n\nAlso, if net-\u003elive is false because the afs netns is being deleted, make\nafs_charge_preallocation() skip charging and make afs_rx_new_call() avoid\nrequeuing the charger.\n\n(This was found by AI review)."
        }
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            "baseSeverity": "CRITICAL",
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            "version": "3.1"
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            {
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              "value": "AV:N - Remote RxRPC/UDP traffic to the kafs callback manager on port 7001 reaches afs_rx_new_call through rxrpc incoming-call processing and can requeue charge_preallocation_work that touches per-net AFS state during namespace teardown, matching other network-reachable netns-teardown UAF bugs.\nAC:L - The attacker controls both sides of the race\u2014namespace create/destroy timing via user namespaces or container lifecycle, plus concurrent RxRPC callback floods\u2014and the follow-up fix confirms incoming I/O-thread calls can requeue the charger after listen(0); the window is wide and repeatable.\nPR:N - afs_rx_new_call is invoked during RXRPC_CONN_SERVICE_CHALLENGING before AFS credential verification completes, so a remote peer sending valid CM-service RxRPC DATA can drive the bug; alternatively an unprivileged user obtains CAP_NET_ADMIN via user namespaces to destroy the namespace.\nUI:N - No victim interaction such as mounting AFS volumes or opening files is required; exploitation relies on attacker-driven namespace teardown and/or RxRPC packets, both kernel-level events under attacker or infrastructure control.\nS:U - The UAF corrupts kernel heap objects within the same OS security authority; impact does not cross a VM, IOMMU, or KVM/Xen boundary into a separate security domain.\nC:H - charge_preallocation_work on afs_wq dereferences freed struct afs_net fields (socket, spare_incoming_call, nr_outstanding_calls) after per-net exit; UAF of slab objects enables arbitrary kernel memory disclosure via heap grooming.\nI:H - Continued charging and afs_alloc_call through freed afs_net writes into stale per-net counters and socket state; UAF supports heap spray and arbitrary kernel write or control-flow hijack primitives.\nA:H - Use-after-free on afs_net and its RxRPC socket during teardown causes kernel oops or panic; even without full exploitation the race reliably crashes the host and can be retriggered on demand."
            }
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      "providerMetadata": {
        "dateUpdated": "2026-08-17T05:47:02.011Z",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-74427",
    "datePublished": "2026-08-15T05:59:29.053Z",
    "dateReserved": "2026-08-15T05:44:03.895Z",
    "dateUpdated": "2026-08-17T05:47:02.011Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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Action not permitted

GHSA-2HJ8-22XR-W775

CVE-2026-74427 (GCVE-0-2026-74427)

Tags

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Nomenclature

Related by attack behaviour