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"text":"High"
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"csaf_version":"2.0",
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{
"text":"kernel security update",
"category":"general",
"title":"Synopsis"
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{
"text":"An update for kernel is now available for openEuler-20.03-LTS-SP4",
"category":"general",
"title":"Summary"
},
{
"text":"The Linux Kernel, the operating system core itself.\n\nSecurity Fix(es):\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nmm/slub: avoid accessing metadata when pointer is invalid in object_err()\n\nobject_err() reports details of an object for further debugging, such as\nthe freelist pointer, redzone, etc. However, if the pointer is invalid,\nattempting to access object metadata can lead to a crash since it does\nnot point to a valid object.\n\nOne known path to the crash is when alloc_consistency_checks()\ndetermines the pointer to the allocated object is invalid because of a\nfreelist corruption, and calls object_err() to report it. The debug code\nshould report and handle the corruption gracefully and not crash in the\nprocess.\n\nIn case the pointer is NULL or check_valid_pointer() returns false for\nthe pointer, only print the pointer value and skip accessing metadata.(CVE-2025-39902)\n\nIn 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\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's 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->newlink)\n err = ops->newlink(dev, ¶ms, extack);\n else\n err = register_netdevice(dev);\n if (err < 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's 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
\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.(CVE-2026-23209)",
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"title":"Description"
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"text":"An update for kernel is now available for openEuler-20.03-LTS-SP4.\n\nopenEuler Security has rated this update as having a security impact of high. A Common Vunlnerability Scoring System(CVSS)base score,which gives a detailed severity rating, is available for each vulnerability from the CVElink(s) in the References section.",
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"text":"High",
"category":"general",
"title":"Severity"
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"text":"kernel",
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"summary":"openEuler-SA-2026-1568",
"category":"self",
"url":"https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-1568"
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"summary":"CVE-2025-39902",
"category":"self",
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},
{
"summary":"CVE-2026-23209",
"category":"self",
"url":"https://www.openeuler.org/en/security/cve/detail/?cveId=CVE-2026-23209&packageName=kernel"
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"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-23209"
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{
"summary":"openEuler-SA-2026-1568 vex file",
"category":"self",
"url":"https://repo.openeuler.org/security/data/csaf/advisories/2026/csaf-openeuler-sa-2026-1568.json"
}
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"title":"An update for kernel is now available for openEuler-20.03-LTS-SP4",
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"text":"In the Linux kernel, the following vulnerability has been resolved:\n\nmm/slub: avoid accessing metadata when pointer is invalid in object_err()\n\nobject_err() reports details of an object for further debugging, such as\nthe freelist pointer, redzone, etc. However, if the pointer is invalid,\nattempting to access object metadata can lead to a crash since it does\nnot point to a valid object.\n\nOne known path to the crash is when alloc_consistency_checks()\ndetermines the pointer to the allocated object is invalid because of a\nfreelist corruption, and calls object_err() to report it. The debug code\nshould report and handle the corruption gracefully and not crash in the\nprocess.\n\nIn case the pointer is NULL or check_valid_pointer() returns false for\nthe pointer, only print the pointer value and skip accessing metadata.",
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"title":"Vulnerability Description"
}
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"openEuler-20.03-LTS-SP4:perf-debuginfo-4.19.90-2603.2.0.0365.oe2003sp4.aarch64",
"openEuler-20.03-LTS-SP4:python2-perf-4.19.90-2603.2.0.0365.oe2003sp4.aarch64",
"openEuler-20.03-LTS-SP4:python2-perf-debuginfo-4.19.90-2603.2.0.0365.oe2003sp4.aarch64",
"openEuler-20.03-LTS-SP4:python3-perf-4.19.90-2603.2.0.0365.oe2003sp4.aarch64",
"openEuler-20.03-LTS-SP4:python3-perf-debuginfo-4.19.90-2603.2.0.0365.oe2003sp4.aarch64"
]
},
"remediations":[
{
"product_ids":{"$ref":"$.vulnerabilities[0].product_status.fixed"},
"details":"kernel security update",
"category":"vendor_fix",
"url":"https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-1568"
}
],
"scores":[
{
"cvss_v3":{
"baseSeverity":"MEDIUM",
"baseScore":5.5,
"vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
"version":"3.1"
},
"products":{"$ref":"$.vulnerabilities[0].product_status.fixed"}
}
],
"threats":[
{
"details":"Medium",
"category":"impact"
}
],
"title":"CVE-2025-39902"
},
{
"cve":"CVE-2026-23209",
"notes":[
{
"text":"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\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's 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->newlink)\n err = ops->newlink(dev, ¶ms, extack);\n else\n err = register_netdevice(dev);\n if (err < 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's 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
\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.",
"category":"description",
"title":"Vulnerability Description"
}
],
"product_status":{
"fixed":{"$ref":"$.vulnerabilities[0].product_status.fixed"}
},
"remediations":[
{
"product_ids":{"$ref":"$.vulnerabilities[0].product_status.fixed"},
"details":"kernel security update",
"category":"vendor_fix",
"url":"https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-1568"
}
],
"scores":[
{
"cvss_v3":{
"baseSeverity":"HIGH",
"baseScore":7.0,
"vectorString":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version":"3.1"
},
"products":{"$ref":"$.vulnerabilities[0].product_status.fixed"}
}
],
"threats":[
{
"details":"High",
"category":"impact"
}
],
"title":"CVE-2026-23209"
}
]
}