CVE-2025-21765

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No local access is needed.\nAC:H - The use-after-free only materialises if the `struct net` obtained from `dev_net(dst->dev)` is concurrently torn down (netns dismantle or `dev_change_net_namespace()`), a condition a remote attacker cannot influence, and the unprotected window between the pointer load and the `ip6_rt_min_advmss` dereference is narrow.\nPR:N - There is no privilege, capability or authentication check anywhere on the path; the code runs in softirq during SYN processing before any connection is established or credentials exchanged.\nUI:N - The attacker triggers the path entirely by transmitting packets to a listening IPv6 port; no action by a local user or victim process is required.\nS:U - The stale `struct net` dereference is confined to the kernel's own networking stack on the same host, crossing no virtualization, IOMMU or other security-authority boundary.\nC:H - This is a use-after-free read of a freed `net_cachep` slab object, and the recovered value directly influences the MSS advertised in the SYN-ACK, exposing reallocated kernel heap contents to the remote peer as an oracle.\nI:H - Reuse of a freed `struct net` means kernel state is derived from attacker-groomable reallocated slab memory; per UAF scoring guidance such object reuse is treated as corruption exploitable for further modification of kernel state.\nA:H - Dereferencing a `struct net` that has already been returned to the slab allocator can fault or read garbage, producing a KASAN splat, oops or panic in the TCP receive softirq path, and the trigger is repeatable with ordinary inbound connections."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/ipv6/route.c"], "versions": [{"version": "5578689a4e3c04f2d43ea39736fd3fa396d80c6e", "lessThan": "78ad057472d8c76e0602402269222f9f9c698790", "status": "affected", "versionType": "git"}, {"version": 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"https://cert-portal.siemens.com/productcert/html/ssa-457936.html"}, {"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "url": "https://cert-portal.siemens.com/productcert/html/ssa-784472.html"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: ipv6: use RCU protection in ip6_default_advmss()", "id": "2348645", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2348645"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-414", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nipv6: use RCU protection in ip6_default_advmss()\nip6_default_advmss() needs rcu protection to make\nsure the net structure it reads does not disappear."], "name": "CVE-2025-21765", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Out of support scope", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Will not fix", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2025-02-27T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2025-21765\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-21765\nhttps://lore.kernel.org/linux-cve-announce/2025022605-CVE-2025-21765-4d5e@gregkh/T"], "threat_severity": "Moderate"}

{}