{"answers":{"affected":"It affects 1 product.","exploited":"There is no known exploitation of CVE-2025-21716 in the wild and no public exploit code.","fix":"Apply the vendor's patch.","what":"CVE-2025-21716 is a medium-severity vulnerability in Linux kernel, published on 27 Feb 2025. It can only be exploited from the same machine or local network, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2025-21716 and fix it if it is affected.\n\nWhat it is: CVE-2025-21716 is a medium-severity vulnerability in Linux kernel, published on 27 Feb 2025. It can only be exploited from the same machine or local network, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2025-21716 in the wild and no public exploit code.\n\nAffected product: Linux kernel. No package-level version data is available, so check the vendor advisory linked from the reference page.\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2025-21716/ (Markdown: https://insights.sbomify.com/CVE-2025-21716/index.md)","id":"CVE-2025-21716","markdown":"https://insights.sbomify.com/CVE-2025-21716/index.md","name":"CVE-2025-21716","record":{"aliases":["BELL-CVE-2025-21716","DEBIAN-CVE-2025-21716","GHSA-89mr-qgjp-42xf","ROOT-OS-UBUNTU-2404-CVE-2025-21716","UBUNTU-CVE-2025-21716"],"analysis":{"component_type":"kernel","fix_type":"patch","impacts":["data_read"],"network_reachable":"adjacent_or_local","non_default_config":false,"product_category":"Linux kernel VXLAN","requires_auth":"low_privilege","summary":"A local attacker can trigger an uninitialized memory read in the Linux kernel VXLAN driver, potentially disclosing sensitive kernel memory contents.","user_interaction":"not_required","vuln_class":"information_disclosure"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"Linux","cpe":[{"product":"linux_kernel","vendor":"linux"}],"cvss":{"score":5.5,"severity":"medium","source":"cisa-adp","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"cwes":[{"id":"CWE-908","name":"Use of Uninitialized Resource"}],"description":"In the Linux kernel, the following vulnerability has been resolved:\n\nvxlan: Fix uninit-value in vxlan_vnifilter_dump()\n\nKMSAN reported an uninit-value access in vxlan_vnifilter_dump() [1].\n\nIf the length of the netlink message payload is less than\nsizeof(struct tunnel_msg), vxlan_vnifilter_dump() accesses bytes\nbeyond the message. This can lead to uninit-value access. Fix this by\nreturning an error in such situations.\n\n[1]\nBUG: KMSAN: uninit-value in vxlan_vnifilter_dump+0x328/0x920 drivers/net/vxlan/vxlan_vnifilter.c:422\n vxlan_vnifilter_dump+0x328/0x920 drivers/net/vxlan/vxlan_vnifilter.c:422\n rtnl_dumpit+0xd5/0x2f0 net/core/rtnetlink.c:6786\n netlink_dump+0x93e/0x15f0 net/netlink/af_netlink.c:2317\n __netlink_dump_start+0x716/0xd60 net/netlink/af_netlink.c:2432\n netlink_dump_start include/linux/netlink.h:340 [inline]\n rtnetlink_dump_start net/core/rtnetlink.c:6815 [inline]\n rtnetlink_rcv_msg+0x1256/0x14a0 net/core/rtnetlink.c:6882\n netlink_rcv_skb+0x467/0x660 net/netlink/af_netlink.c:2542\n rtnetlink_rcv+0x35/0x40 net/core/rtnetlink.c:6944\n netlink_unicast_kernel net/netlink/af_netlink.c:1321 [inline]\n netlink_unicast+0xed6/0x1290 net/netlink/af_netlink.c:1347\n netlink_sendmsg+0x1092/0x1230 net/netlink/af_netlink.c:1891\n sock_sendmsg_nosec net/socket.c:711 [inline]\n __sock_sendmsg+0x330/0x3d0 net/socket.c:726\n ____sys_sendmsg+0x7f4/0xb50 net/socket.c:2583\n ___sys_sendmsg+0x271/0x3b0 net/socket.c:2637\n __sys_sendmsg net/socket.c:2669 [inline]\n __do_sys_sendmsg net/socket.c:2674 [inline]\n __se_sys_sendmsg net/socket.c:2672 [inline]\n __x64_sys_sendmsg+0x211/0x3e0 net/socket.c:2672\n x64_sys_call+0x3878/0x3d90 arch/x86/include/generated/asm/syscalls_64.h:47\n do_syscall_x64 arch/x86/entry/common.c:52 [inline]\n do_syscall_64+0xd9/0x1d0 arch/x86/entry/common.c:83\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\n\nUninit was created at:\n slab_post_alloc_hook mm/slub.c:4110 [inline]\n slab_alloc_node mm/slub.c:4153 [inline]\n kmem_cache_alloc_node_noprof+0x800/0xe80 mm/slub.c:4205\n kmalloc_reserve+0x13b/0x4b0 net/core/skbuff.c:587\n __alloc_skb+0x347/0x7d0 net/core/skbuff.c:678\n alloc_skb include/linux/skbuff.h:1323 [inline]\n netlink_alloc_large_skb+0xa5/0x280 net/netlink/af_netlink.c:1196\n netlink_sendmsg+0xac9/0x1230 net/netlink/af_netlink.c:1866\n sock_sendmsg_nosec net/socket.c:711 [inline]\n __sock_sendmsg+0x330/0x3d0 net/socket.c:726\n ____sys_sendmsg+0x7f4/0xb50 net/socket.c:2583\n ___sys_sendmsg+0x271/0x3b0 net/socket.c:2637\n __sys_sendmsg net/socket.c:2669 [inline]\n __do_sys_sendmsg net/socket.c:2674 [inline]\n __se_sys_sendmsg net/socket.c:2672 [inline]\n __x64_sys_sendmsg+0x211/0x3e0 net/socket.c:2672\n x64_sys_call+0x3878/0x3d90 arch/x86/include/generated/asm/syscalls_64.h:47\n do_syscall_x64 arch/x86/entry/common.c:52 [inline]\n do_syscall_64+0xd9/0x1d0 arch/x86/entry/common.c:83\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\n\nCPU: 0 UID: 0 PID: 30991 Comm: syz.4.10630 Not tainted 6.12.0-10694-gc44daa7e3c73 #29\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.3-3.fc41 04/01/2014","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":true,"headline":"vxlan: Fix uninit-value in vxlan_vnifilter_dump()","id":"CVE-2025-21716","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":"linux:linux_kernel","products":["linux:linux_kernel"],"type":"information_disclosure","year":"2025"},"n_packages":0,"n_references":5,"next":{"headline":"net/mlx5e: add missing cpu_to_node to kvzalloc_node in mlx5e_open_xdpredirect_sq","id":"CVE-2025-21717"},"packages":[],"prev":{"headline":"net: davicom: fix UAF in dm9000_drv_remove","id":"CVE-2025-21715"},"products":["Linux"],"published":"2025-02-27","related":[{"cvss_score":8.8,"headline":"Linux Kernel Out-of-Bounds Write","id":"CVE-2026-53266","kev_date_added":"2026-09-18","published":"2026-06-25"},{"cvss_score":8.8,"headline":"Linux Kernel Improper Input Validation","id":"CVE-2013-6282","kev_date_added":"2022-09-15","published":"2013-11-19"},{"cvss_score":8.4,"headline":"Linux Kernel Heap-Based Buffer Overflow","id":"CVE-2022-0185","kev_date_added":"2024-08-21","published":"2022-02-11"},{"cvss_score":8.4,"headline":"Linux Kernel Privilege Escalation","id":"CVE-2013-2094","kev_date_added":"2022-09-15","published":"2013-05-14"},{"cvss_score":7.8,"headline":"Linux Kernel Unspecified","id":"CVE-2026-53362","kev_date_added":"2026-08-27","published":"2026-07-04"},{"cvss_score":7.8,"headline":"Linux Kernel Missing Initialization of a Variable","id":"CVE-2026-46300","kev_date_added":"2026-10-28","published":"2026-05-23"},{"cvss_score":7.8,"headline":"Linux Kernel Race Condition","id":"CVE-2025-39964","kev_date_added":"2026-09-18","published":"2025-10-13"}],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"US public information, NVD API terms","name":"NVD"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"no","exploitation":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-10-15","vendors":["Linux"]},"summary":"A local attacker can trigger an uninitialized memory read in the Linux kernel VXLAN driver, potentially disclosing sensitive kernel memory contents.","url":"https://insights.sbomify.com/CVE-2025-21716/"}