Vulnerability-Lookup

alsa-2026:6037

Vulnerability from osv_almalinux

Published

2026-03-30 00:00

Modified

2026-03-30 10:55

Summary

Moderate: 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 vulnerability in ATM subsystem (CVE-2025-38180)
kernel: macvlan: fix error recovery in macvlan_common_newlink() (CVE-2026-23209)
kernel: net/sched: cls_u32: use skb_header_pointer_careful() (CVE-2026-23204)

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-2026:6037	ADVISORY
	https://access.redhat.com/security/cve/CVE-2025-38180	REPORT
	https://access.redhat.com/security/cve/CVE-2026-23204	REPORT
	https://access.redhat.com/security/cve/CVE-2026-23209	REPORT
	https://bugzilla.redhat.com/2376376	REPORT
	https://bugzilla.redhat.com/2439900	REPORT
	https://bugzilla.redhat.com/2439931	REPORT
	https://errata.almalinux.org/8/ALSA-2026-6037.html	ADVISORY

JSON

To clipboard

{
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  ],
  "details": "The kernel packages contain the Linux kernel, the core of any Linux operating system.  \n\nSecurity Fix(es):  \n\n  * kernel: Linux kernel: Use-After-Free vulnerability in ATM subsystem (CVE-2025-38180)\n  * kernel: macvlan: fix error recovery in macvlan_common_newlink() (CVE-2026-23209)\n  * kernel: net/sched: cls_u32: use skb_header_pointer_careful() (CVE-2026-23204)\n\n\nFor 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.\n",
  "id": "ALSA-2026:6037",
  "modified": "2026-03-30T10:55:07Z",
  "published": "2026-03-30T00:00:00Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://access.redhat.com/errata/RHSA-2026:6037"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2025-38180"
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    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-23204"
    },
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      "url": "https://access.redhat.com/security/cve/CVE-2026-23209"
    },
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      "url": "https://bugzilla.redhat.com/2376376"
    },
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      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2439900"
    },
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      "url": "https://bugzilla.redhat.com/2439931"
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      "url": "https://errata.almalinux.org/8/ALSA-2026-6037.html"
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    "CVE-2026-23204"
  ],
  "summary": "Moderate: kernel security update"
}

CVE-2026-23209 (GCVE-0-2026-23209)

Vulnerability from cvelistv5 – Published: 2026-02-14 16:27 – Updated: 2026-04-03 13:32

Title

macvlan: fix error recovery in macvlan_common_newlink()

Summary

In the Linux kernel, the following vulnerability has been resolved: macvlan: fix error recovery in macvlan_common_newlink() valis provided a nice repro to crash the kernel: ip link add p1 type veth peer p2 ip link set address 00:00:00:00:00:20 dev p1 ip link set up dev p1 ip link set up dev p2 ip link add mv0 link p2 type macvlan mode source ip link add invalid% link p2 type macvlan mode source macaddr add 00:00:00:00:00:20 ping -c1 -I p1 1.2.3.4 He also gave a very detailed analysis: <quote valis> The issue is triggered when a new macvlan link is created with MACVLAN_MODE_SOURCE mode and MACVLAN_MACADDR_ADD (or MACVLAN_MACADDR_SET) parameter, lower device already has a macvlan port and register_netdevice() called from macvlan_common_newlink() fails (e.g. because of the invalid link name). In this case macvlan_hash_add_source is called from macvlan_change_sources() / macvlan_common_newlink(): This adds a reference to vlan to the port's vlan_source_hash using macvlan_source_entry. vlan is a pointer to the priv data of the link that is being created. When register_netdevice() fails, the error is returned from macvlan_newlink() to rtnl_newlink_create(): if (ops->newlink) err = ops->newlink(dev, &params, extack); else err = register_netdevice(dev); if (err < 0) { free_netdev(dev); goto out; } and free_netdev() is called, causing a kvfree() on the struct net_device that is still referenced in the source entry attached to the lower device's macvlan port. Now all packets sent on the macvlan port with a matching source mac address will trigger a use-after-free in macvlan_forward_source(). </quote valis> With all that, my fix is to make sure we call macvlan_flush_sources() regardless of @create value whenever "goto destroy_macvlan_port;" path is taken. Many thanks to valis for following up on this issue.

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

References

URL

Tags

	https://git.kernel.org/stable/c/da5c6b8ae47e414be…
	https://git.kernel.org/stable/c/5dae6b36a7cb7a4fc…
	https://git.kernel.org/stable/c/c43d0e787cbba569e…
	https://git.kernel.org/stable/c/11ba9f0dc86513617…
	https://git.kernel.org/stable/c/986967a1621427100…
	https://git.kernel.org/stable/c/cdedcd5aa3f3cb8b7…
	https://git.kernel.org/stable/c/f8db6475a83649689…

Impacted products

Vendor

Product

Version

Linux

Affected: aa5fd0fb77486b8a6764ead8627baa14790e4280 , < da5c6b8ae47e414be47e5e04def15b25d5c962dc (git)
Affected: aa5fd0fb77486b8a6764ead8627baa14790e4280 , < 5dae6b36a7cb7a4fcf4121b95e9ca7f96f816c8a (git)
Affected: aa5fd0fb77486b8a6764ead8627baa14790e4280 , < c43d0e787cbba569ec9d11579ed370b50fab6c9c (git)
Affected: aa5fd0fb77486b8a6764ead8627baa14790e4280 , < 11ba9f0dc865136174cb98834280fb21bbc950c7 (git)
Affected: aa5fd0fb77486b8a6764ead8627baa14790e4280 , < 986967a162142710076782d5b93daab93a892980 (git)
Affected: aa5fd0fb77486b8a6764ead8627baa14790e4280 , < cdedcd5aa3f3cb8b7ae0f87ab3a936d0bd583d66 (git)
Affected: aa5fd0fb77486b8a6764ead8627baa14790e4280 , < f8db6475a83649689c087a8f52486fcc53e627e9 (git)

Linux

Affected: 4.9
Unaffected: 0 , < 4.9 (semver)
Unaffected: 5.10.250 , ≤ 5.10.* (semver)
Unaffected: 5.15.200 , ≤ 5.15.* (semver)
Unaffected: 6.1.163 , ≤ 6.1.* (semver)
Unaffected: 6.6.124 , ≤ 6.6.* (semver)
Unaffected: 6.12.70 , ≤ 6.12.* (semver)
Unaffected: 6.18.10 , ≤ 6.18.* (semver)
Unaffected: 6.19 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmacvlan: fix error recovery in macvlan_common_newlink()\n\nvalis provided a nice repro to crash the kernel:\n\nip link add p1 type veth peer p2\nip link set address 00:00:00:00:00:20 dev p1\nip link set up dev p1\nip link set up dev p2\n\nip link add mv0 link p2 type macvlan mode source\nip link add invalid% link p2 type macvlan mode source macaddr add 00:00:00:00:00:20\n\nping -c1 -I p1 1.2.3.4\n\nHe also gave a very detailed analysis:\n\n\u003cquote valis\u003e\n\nThe issue is triggered when a new macvlan link is created  with\nMACVLAN_MODE_SOURCE mode and MACVLAN_MACADDR_ADD (or\nMACVLAN_MACADDR_SET) parameter, lower device already has a macvlan\nport and register_netdevice() called from macvlan_common_newlink()\nfails (e.g. because of the invalid link name).\n\nIn this case macvlan_hash_add_source is called from\nmacvlan_change_sources() / macvlan_common_newlink():\n\nThis adds a reference to vlan to the port\u0027s vlan_source_hash using\nmacvlan_source_entry.\n\nvlan is a pointer to the priv data of the link that is being created.\n\nWhen register_netdevice() fails, the error is returned from\nmacvlan_newlink() to rtnl_newlink_create():\n\n        if (ops-\u003enewlink)\n                err = ops-\u003enewlink(dev, \u0026params, extack);\n        else\n                err = register_netdevice(dev);\n        if (err \u003c 0) {\n                free_netdev(dev);\n                goto out;\n        }\n\nand free_netdev() is called, causing a kvfree() on the struct\nnet_device that is still referenced in the source entry attached to\nthe lower device\u0027s macvlan port.\n\nNow all packets sent on the macvlan port with a matching source mac\naddress will trigger a use-after-free in macvlan_forward_source().\n\n\u003c/quote valis\u003e\n\nWith all that, my fix is to make sure we call macvlan_flush_sources()\nregardless of @create value whenever \"goto destroy_macvlan_port;\"\npath is taken.\n\nMany thanks to valis for following up on this issue."
        }
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            "baseScore": 7.8,
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    "dateReserved": "2026-01-13T15:37:45.986Z",
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CVE-2025-38180 (GCVE-0-2025-38180)

Vulnerability from cvelistv5 – Published: 2025-07-04 13:37 – Updated: 2025-11-03 17:35

Title

net: atm: fix /proc/net/atm/lec handling

Summary

In the Linux kernel, the following vulnerability has been resolved: net: atm: fix /proc/net/atm/lec handling /proc/net/atm/lec must ensure safety against dev_lec[] changes. It appears it had dev_put() calls without prior dev_hold(), leading to imbalance and UAF.

Severity ?

No CVSS data available.

Assigner

Linux

References

URL

Tags

	https://git.kernel.org/stable/c/fcfccf56f4eba7d00…
	https://git.kernel.org/stable/c/f2d1443b18806640a…
	https://git.kernel.org/stable/c/ca3829c18c8d0ceb6…
	https://git.kernel.org/stable/c/e612c4b014f5808fb…
	https://git.kernel.org/stable/c/a5e3a144268899f1a…
	https://git.kernel.org/stable/c/5fe1b23a2f87f43ae…
	https://git.kernel.org/stable/c/9b9aeb3ada44d8abe…
	https://git.kernel.org/stable/c/d03b79f459c7935cf…

Impacted products

Vendor

Product

Version

Linux

Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < fcfccf56f4eba7d00aa2d33c7bb1b33083237742 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < f2d1443b18806640abdb530e88009af7be2588e7 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < ca3829c18c8d0ceb656605d3bff6bb3dfb078589 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < e612c4b014f5808fbc6beae21f5ccaca5e76a2f8 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < a5e3a144268899f1a8c445c8a3bfa15873ba85e8 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 5fe1b23a2f87f43aeeac51e08819cbc6fd808cbc (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 9b9aeb3ada44d8abea1e31e4446113f460848ae4 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < d03b79f459c7935cff830d98373474f440bd03ae (git)

Linux

Affected: 2.6.12
Unaffected: 0 , < 2.6.12 (semver)
Unaffected: 5.4.295 , ≤ 5.4.* (semver)
Unaffected: 5.10.239 , ≤ 5.10.* (semver)
Unaffected: 5.15.186 , ≤ 5.15.* (semver)
Unaffected: 6.1.142 , ≤ 6.1.* (semver)
Unaffected: 6.6.95 , ≤ 6.6.* (semver)
Unaffected: 6.12.35 , ≤ 6.12.* (semver)
Unaffected: 6.15.4 , ≤ 6.15.* (semver)
Unaffected: 6.16 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

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CVE-2026-23204 (GCVE-0-2026-23204)

Vulnerability from cvelistv5 – Published: 2026-02-14 16:27 – Updated: 2026-04-03 13:32

Title

net/sched: cls_u32: use skb_header_pointer_careful()

Summary

In the Linux kernel, the following vulnerability has been resolved: net/sched: cls_u32: use skb_header_pointer_careful() skb_header_pointer() does not fully validate negative @offset values. Use skb_header_pointer_careful() instead. GangMin Kim provided a report and a repro fooling u32_classify(): BUG: KASAN: slab-out-of-bounds in u32_classify+0x1180/0x11b0 net/sched/cls_u32.c:221

Severity ?

7.1 (High)


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

Assigner

Linux

References

URL

Tags

	https://git.kernel.org/stable/c/cfa745830e45ecb75…
	https://git.kernel.org/stable/c/13336a6239b9d7c6e…
	https://git.kernel.org/stable/c/e41a23e61259f5526…
	https://git.kernel.org/stable/c/8a672f177ebe19c93…
	https://git.kernel.org/stable/c/cabd1a976375780da…

Impacted products

Vendor

Product

Version

Linux

Affected: fbc2e7d9cf49e0bf89b9e91fd60a06851a855c5d , < cfa745830e45ecb75c061aa34330ee0cac941cc7 (git)
Affected: fbc2e7d9cf49e0bf89b9e91fd60a06851a855c5d , < 13336a6239b9d7c6e61483017bb8bdfe3ceb10a5 (git)
Affected: fbc2e7d9cf49e0bf89b9e91fd60a06851a855c5d , < e41a23e61259f5526af875c3b86b3d42a9bae0e5 (git)
Affected: fbc2e7d9cf49e0bf89b9e91fd60a06851a855c5d , < 8a672f177ebe19c93d795fbe967846084fbc7943 (git)
Affected: fbc2e7d9cf49e0bf89b9e91fd60a06851a855c5d , < cabd1a976375780dabab888784e356f574bbaed8 (git)

Linux

Affected: 2.6.35
Unaffected: 0 , < 2.6.35 (semver)
Unaffected: 6.1.167 , ≤ 6.1.* (semver)
Unaffected: 6.6.124 , ≤ 6.6.* (semver)
Unaffected: 6.12.70 , ≤ 6.12.* (semver)
Unaffected: 6.18.10 , ≤ 6.18.* (semver)
Unaffected: 6.19 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

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                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.70",
                  "versionStartIncluding": "2.6.35",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.10",
                  "versionStartIncluding": "2.6.35",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.19",
                  "versionStartIncluding": "2.6.35",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: cls_u32: use skb_header_pointer_careful()\n\nskb_header_pointer() does not fully validate negative @offset values.\n\nUse skb_header_pointer_careful() instead.\n\nGangMin Kim provided a report and a repro fooling u32_classify():\n\nBUG: KASAN: slab-out-of-bounds in u32_classify+0x1180/0x11b0\nnet/sched/cls_u32.c:221"
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.1,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
            "version": "3.1"
          }
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-04-03T13:32:30.124Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/cfa745830e45ecb75c061aa34330ee0cac941cc7"
        },
        {
          "url": "https://git.kernel.org/stable/c/13336a6239b9d7c6e61483017bb8bdfe3ceb10a5"
        },
        {
          "url": "https://git.kernel.org/stable/c/e41a23e61259f5526af875c3b86b3d42a9bae0e5"
        },
        {
          "url": "https://git.kernel.org/stable/c/8a672f177ebe19c93d795fbe967846084fbc7943"
        },
        {
          "url": "https://git.kernel.org/stable/c/cabd1a976375780dabab888784e356f574bbaed8"
        }
      ],
      "title": "net/sched: cls_u32: use skb_header_pointer_careful()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-23204",
    "datePublished": "2026-02-14T16:27:27.708Z",
    "dateReserved": "2026-01-13T15:37:45.986Z",
    "dateUpdated": "2026-04-03T13:32:30.124Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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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

alsa-2026:6037

Vulnerability from osv_almalinux

CVE-2026-23209 (GCVE-0-2026-23209)

CVE-2025-38180 (GCVE-0-2025-38180)

CVE-2026-23204 (GCVE-0-2026-23204)

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