CVE-2026-46323 (GCVE-0-2026-46323)

Vulnerability from cvelistv5 – Published: 2026-06-09 12:11 – Updated: 2026-07-23 12:08
VLAI
Title
net: gro: don't merge zcopy skbs
Summary
In the Linux kernel, the following vulnerability has been resolved: net: gro: don't merge zcopy skbs skb_gro_receive() can currently copy frags between the source and GRO skb, without checking the zerocopy status, and in particular the SKBFL_MANAGED_FRAG_REFS flag. When SKBFL_MANAGED_FRAG_REFS is set, the skb doesn't hold a reference on the pages in shinfo->frags. Appending those frags to another skb's frags without fixing up the page refcount can lead to UAF. When either the last skb in the GRO chain (the one we would append frags to) or the source skb is zerocopy, don't merge the skbs.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE
  • CWE-123 - Write-what-where Condition
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 753f1ca4e1e50248a1b760c9774d6d6b354562cc , < 3c6cc9f2ca65b6dd61b1af75452dc0e1cd0aad8d (git)
Affected: 753f1ca4e1e50248a1b760c9774d6d6b354562cc , < 1f9c828556416fbe3f49386708ce999fc4d4da06 (git)
Affected: 753f1ca4e1e50248a1b760c9774d6d6b354562cc , < 479084ae0e1d9cb7929cb4298d35623de189f80a (git)
Affected: 753f1ca4e1e50248a1b760c9774d6d6b354562cc , < e334cbf3388fd9334503a778a82d9e9f14dd2f71 (git)
Affected: 753f1ca4e1e50248a1b760c9774d6d6b354562cc , < 44bea2032af0425e4ce6d26a8af0ede79db49ec1 (git)
Affected: 753f1ca4e1e50248a1b760c9774d6d6b354562cc , < 4db79a322db8c97f7b73b8a347395ef4d685eb40 (git)
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Linux Linux Affected: 6.0
Unaffected: 0 , < 6.0 (semver)
Unaffected: 6.1.176 , ≤ 6.1.* (semver)
Unaffected: 6.6.142 , ≤ 6.6.* (semver)
Unaffected: 6.12.92 , ≤ 6.12.* (semver)
Unaffected: 6.18.34 , ≤ 6.18.* (semver)
Unaffected: 7.0.11 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
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Red Hat Red Hat Enterprise Linux 10 Unaffected: 0:6.12.0-211.38.1.el10_2 , < * (rpm)
    cpe:/o:redhat:enterprise_linux:10.2
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Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support Unaffected: 0:6.12.0-55.82.1.el10_0 , < * (rpm)
    cpe:/o:redhat:enterprise_linux_eus:10.0
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Red Hat Red Hat Enterprise Linux 9 Unaffected: 0:5.14.0-687.22.1.el9_8 , < * (rpm)
    cpe:/a:redhat:enterprise_linux:9
    cpe:/o:redhat:enterprise_linux:9
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Red Hat Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions Unaffected: 0:5.14.0-427.132.1.el9_4 , < * (rpm)
    cpe:/a:redhat:rhel_e4s:9.4
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Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support Unaffected: 0:5.14.0-570.123.1.el9_6 , < * (rpm)
    cpe:/a:redhat:rhel_eus:9.6
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Red Hat Red Hat Enterprise Linux 6     cpe:/o:redhat:enterprise_linux:6
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Red Hat Red Hat Enterprise Linux 7     cpe:/o:redhat:enterprise_linux:7
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Red Hat Red Hat Enterprise Linux 8     cpe:/o:redhat:enterprise_linux:8
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Red Hat Red Hat Enterprise Linux 9     cpe:/o:redhat:enterprise_linux:9
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Red Hat Red Hat Enterprise Linux for NVIDIA 26     cpe:/a:redhat:enterprise_linux_nvidia:
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Red Hat Red Hat OpenShift Container Platform 4     cpe:/a:redhat:openshift:4
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  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-46323",
      "date": "2026-07-25",
      "epss": "0.00137",
      "percentile": "0.03531"
    },
    "microsoft_vex": {
      "current_release_date": "2026-06-28T01:59:04.000Z",
      "cve": "CVE-2026-46323",
      "id": "msrc_CVE-2026-46323",
      "initial_release_date": "2026-06-02T00:00:00.000Z",
      "product_status:fixed": "1",
      "product_status:known_affected": "2",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "net: gro: don\u0027t merge zcopy skbs",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-46323.json",
      "version": "4"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-46323\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-06-09T13:16:37.753\",\"lastModified\":\"2026-07-23T12:18:18.023\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnet: gro: don\u0027t merge zcopy skbs\\n\\nskb_gro_receive() can currently copy frags between the source and GRO\\nskb, without checking the zerocopy status, and in particular the\\nSKBFL_MANAGED_FRAG_REFS flag.\\n\\nWhen SKBFL_MANAGED_FRAG_REFS is set, the skb doesn\u0027t hold a reference\\non the pages in shinfo-\u003efrags. Appending those frags to another skb\u0027s\\nfrags without fixing up the page refcount can lead to UAF.\\n\\nWhen either the last skb in the GRO chain (the one we would append\\nfrags to) or the source skb is zerocopy, don\u0027t merge the skbs.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\\n\\nnet: gro: no fusionar skbs zcopy\\n\\nskb_gro_receive() actualmente puede copiar fragmentos entre el skb de origen y el GRO, sin verificar el estado de zerocopy, y en particular el indicador SKBFL_MANAGED_FRAG_REFS.\\n\\nCuando SKBFL_MANAGED_FRAG_REFS est\u00e1 establecido, el skb no mantiene una referencia en las p\u00e1ginas en shinfo-\u003efrags. Adjuntar esos fragmentos a los fragmentos de otro skb sin corregir el recuento de referencias de la p\u00e1gina puede llevar a UAF.\\n\\nCuando el \u00faltimo skb en la cadena GRO (aquel al que adjuntar\u00edamos fragmentos) o el skb de origen es zerocopy, no fusionar los skbs.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/core/gro.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"753f1ca4e1e50248a1b760c9774d6d6b354562cc\",\"lessThan\":\"3c6cc9f2ca65b6dd61b1af75452dc0e1cd0aad8d\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"753f1ca4e1e50248a1b760c9774d6d6b354562cc\",\"lessThan\":\"1f9c828556416fbe3f49386708ce999fc4d4da06\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"753f1ca4e1e50248a1b760c9774d6d6b354562cc\",\"lessThan\":\"479084ae0e1d9cb7929cb4298d35623de189f80a\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"753f1ca4e1e50248a1b760c9774d6d6b354562cc\",\"lessThan\":\"e334cbf3388fd9334503a778a82d9e9f14dd2f71\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"753f1ca4e1e50248a1b760c9774d6d6b354562cc\",\"lessThan\":\"44bea2032af0425e4ce6d26a8af0ede79db49ec1\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"753f1ca4e1e50248a1b760c9774d6d6b354562cc\",\"lessThan\":\"4db79a322db8c97f7b73b8a347395ef4d685eb40\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/core/gro.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"6.0\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"6.0\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.176\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.142\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.92\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.34\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.0.11\",\"lessThanOrEqual\":\"7.0.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]},{\"source\":\"0b0ca135-0b70-47e7-9f44-1890c2a1c46c\",\"affectedData\":[{\"vendor\":\"Red 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Advisory\"]},{\"url\":\"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-46323.json\",\"source\":\"0b0ca135-0b70-47e7-9f44-1890c2a1c46c\",\"tags\":[\"Third Party Advisory\"]}]}}",
    "redhat_vex": {
      "aggregate_severity": "Important",
      "current_release_date": "2026-07-23T08:20:16+00:00",
      "cve": "CVE-2026-46323",
      "id": "CVE-2026-46323",
      "initial_release_date": "2026-05-19T00:00:00+00:00",
      "product_status:fixed": "1457",
      "product_status:known_affected": "2",
      "product_status:known_not_affected": "112",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: Linux kernel: Use-After-Free in net/gro due to improper handling of zerocopy skbs",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-46323.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "important",
      "current_release_date": "2026-07-15T18:50:52Z",
      "cve": "CVE-2026-46323",
      "id": "CVE-2026-46323",
      "initial_release_date": "2026-06-10T02:25:47Z",
      "product_status:known_not_affected": "291",
      "product_status:recommended": "242",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-46323",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-46323.json",
      "version": "13"
    }
  }
}



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Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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.


Detection rules are retrieved from Rulezet.