Vulnerability-Lookup

alsa-2026:44270

Vulnerability from osv_almalinux

Published

2026-07-23 00:00

Modified

2026-07-25 07:47

Summary

Important: kernel security update

Details

The kernel packages contain the Linux kernel, the core of any Linux operating system.

Security Fix(es):

kernel: Linux kernel: Use-After-Free in net/gro due to improper handling of zerocopy skbs (CVE-2026-46323)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

References

URL

Type

	https://access.redhat.com/errata/RHSA-2026:44270	ADVISORY
	https://access.redhat.com/security/cve/CVE-2026-46323	REPORT
	https://bugzilla.redhat.com/2479832	REPORT
	https://errata.almalinux.org/10/ALSA-2026-44270.html	ADVISORY

JSON

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

Vulnerability from cvelistv5 – Published: 2026-06-09 12:11 – Updated: 2026-07-23 12:08

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

Linux

References

14 references

URL	Tags
https://git.kernel.org/stable/c/3c6cc9f2ca65b6dd6…
https://git.kernel.org/stable/c/1f9c828556416fbe3…
https://git.kernel.org/stable/c/479084ae0e1d9cb79…
https://git.kernel.org/stable/c/e334cbf3388fd9334…
https://git.kernel.org/stable/c/44bea2032af0425e4…
https://git.kernel.org/stable/c/4db79a322db8c97f7…
https://access.redhat.com/security/cve/CVE-2026-46323	vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2479832	issue-trackingx_refsource_REDHAT
https://security.access.redhat.com/data/csaf/v2/v…	x_sadp-csaf-vex
https://access.redhat.com/errata/RHSA-2026:27731	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:44270	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:27735	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:27708	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:36018	vendor-advisoryx_refsource_REDHAT

Impacted products

13 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)
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)
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
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
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
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
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
Red Hat	Red Hat Enterprise Linux 6	cpe:/o:redhat:enterprise_linux:6
Red Hat	Red Hat Enterprise Linux 7	cpe:/o:redhat:enterprise_linux:7
Red Hat	Red Hat Enterprise Linux 8	cpe:/o:redhat:enterprise_linux:8
Red Hat	Red Hat Enterprise Linux 9	cpe:/o:redhat:enterprise_linux:9
Red Hat	Red Hat Enterprise Linux for NVIDIA 26	cpe:/a:redhat:enterprise_linux_nvidia:
Red Hat	Red Hat OpenShift Container Platform 4	cpe:/a:redhat:openshift:4

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          {
            "lang": "en",
            "value": "RHSA-2026:44270: Red Hat Enterprise Linux AppStream (v. 10), Red Hat Enterprise Linux BaseOS (v. 10), Red Hat Enterprise Linux CodeReady Linux Builder (v. 10), Red Hat Enterprise Linux Real Time (v. 10), Red Hat Enterprise Linux Real Time for NFV (v. 10)"
          },
          {
            "lang": "en",
            "value": "RHSA-2026:27735: Red Hat Enterprise Linux AppStream E4S (v.9.4), Red Hat Enterprise Linux BaseOS E4S (v.9.4), Red Hat Enterprise Linux Real Time E4S (v.9.4), Red Hat Enterprise Linux Real Time for NFV E4S (v.9.4)"
          },
          {
            "lang": "en",
            "value": "RHSA-2026:27708: Red Hat CodeReady Linux Builder EUS (v.9.6), Red Hat Enterprise Linux AppStream EUS (v.9.6), Red Hat Enterprise Linux BaseOS EUS (v.9.6), Red Hat Enterprise Linux Real Time EUS (v.9.6), Red Hat Enterprise Linux Real Time for NFV EUS (v.9.6)"
          },
          {
            "lang": "en",
            "value": "RHSA-2026:36018: Red Hat Enterprise Linux AppStream (v. 9), Red Hat Enterprise Linux BaseOS (v. 9), Red Hat Enterprise Linux CodeReady Linux Builder (v. 9), Red Hat Enterprise Linux Real Time (v. 9), Red Hat Enterprise Linux Real Time for NFV (v. 9)"
          }
        ],
        "timeline": [
          {
            "lang": "en",
            "time": "2026-05-19T11:49:44.372Z",
            "value": "Reported to Red Hat."
          },
          {
            "lang": "en",
            "time": "2026-05-19T00:00:00.000Z",
            "value": "Made public."
          }
        ],
        "title": "kernel: Linux kernel: Use-After-Free in net/gro due to improper handling of zerocopy skbs",
        "workarounds": [
          {
            "lang": "en",
            "value": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability."
          }
        ],
        "x_adpType": "supplier",
        "x_generator": {
          "engine": "sadp-cli 1.0.0"
        }
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/core/gro.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "3c6cc9f2ca65b6dd61b1af75452dc0e1cd0aad8d",
              "status": "affected",
              "version": "753f1ca4e1e50248a1b760c9774d6d6b354562cc",
              "versionType": "git"
            },
            {
              "lessThan": "1f9c828556416fbe3f49386708ce999fc4d4da06",
              "status": "affected",
              "version": "753f1ca4e1e50248a1b760c9774d6d6b354562cc",
              "versionType": "git"
            },
            {
              "lessThan": "479084ae0e1d9cb7929cb4298d35623de189f80a",
              "status": "affected",
              "version": "753f1ca4e1e50248a1b760c9774d6d6b354562cc",
              "versionType": "git"
            },
            {
              "lessThan": "e334cbf3388fd9334503a778a82d9e9f14dd2f71",
              "status": "affected",
              "version": "753f1ca4e1e50248a1b760c9774d6d6b354562cc",
              "versionType": "git"
            },
            {
              "lessThan": "44bea2032af0425e4ce6d26a8af0ede79db49ec1",
              "status": "affected",
              "version": "753f1ca4e1e50248a1b760c9774d6d6b354562cc",
              "versionType": "git"
            },
            {
              "lessThan": "4db79a322db8c97f7b73b8a347395ef4d685eb40",
              "status": "affected",
              "version": "753f1ca4e1e50248a1b760c9774d6d6b354562cc",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/core/gro.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.0"
            },
            {
              "lessThan": "6.0",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.176",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.142",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.92",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.34",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.11",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.176",
                  "versionStartIncluding": "6.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.142",
                  "versionStartIncluding": "6.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.92",
                  "versionStartIncluding": "6.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.34",
                  "versionStartIncluding": "6.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0.11",
                  "versionStartIncluding": "6.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1",
                  "versionStartIncluding": "6.0",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "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."
        }
      ],
      "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"
          }
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-06-19T12:00:26.362Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/3c6cc9f2ca65b6dd61b1af75452dc0e1cd0aad8d"
        },
        {
          "url": "https://git.kernel.org/stable/c/1f9c828556416fbe3f49386708ce999fc4d4da06"
        },
        {
          "url": "https://git.kernel.org/stable/c/479084ae0e1d9cb7929cb4298d35623de189f80a"
        },
        {
          "url": "https://git.kernel.org/stable/c/e334cbf3388fd9334503a778a82d9e9f14dd2f71"
        },
        {
          "url": "https://git.kernel.org/stable/c/44bea2032af0425e4ce6d26a8af0ede79db49ec1"
        },
        {
          "url": "https://git.kernel.org/stable/c/4db79a322db8c97f7b73b8a347395ef4d685eb40"
        }
      ],
      "title": "net: gro: don\u0027t merge zcopy skbs",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-46323",
    "datePublished": "2026-06-09T12:11:15.562Z",
    "dateReserved": "2026-05-13T15:03:33.112Z",
    "dateUpdated": "2026-07-23T12:08:01.409Z",
    "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.

Detection rules are retrieved from Rulezet.

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.

Action not permitted

alsa-2026:44270

Vulnerability from osv_almalinux

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

Tags

Sightings

Nomenclature