{"answers":{"affected":"It affects 1 product.","exploited":"There is no known exploitation of CVE-2025-21925 in the wild and no public exploit code.","fix":"Apply the vendor's patch.","what":"CVE-2025-21925 is a medium-severity denial of service vulnerability in Linux kernel, published on 1 Apr 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-2025-21925 and fix it if it is affected.\n\nWhat it is: CVE-2025-21925 is a medium-severity denial of service vulnerability in Linux kernel, published on 1 Apr 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-2025-21925 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-2025-21925/ (Markdown: https://insights.sbomify.com/CVE-2025-21925/index.md)","id":"CVE-2025-21925","markdown":"https://insights.sbomify.com/CVE-2025-21925/index.md","name":"CVE-2025-21925","record":{"aliases":["BELL-CVE-2025-21925","DEBIAN-CVE-2025-21925","GHSA-chr3-3876-prr8","ROOT-OS-UBUNTU-2404-CVE-2025-21925","UBUNTU-CVE-2025-21925"],"analysis":{"component_type":"kernel","fix_type":"patch","impacts":["denial_of_service"],"network_reachable":"adjacent_or_local","non_default_config":false,"product_category":"Linux kernel","requires_auth":"low_privilege","summary":"A flaw in the Linux kernel LLC protocol allows local attackers to crash the system by triggering a kernel bug via network transmission.","user_interaction":"not_required","vuln_class":"denial_of_service"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"Linux","cpe":[{"product":"linux_kernel","vendor":"linux"}],"cvss":{"score":5.5,"severity":"medium","source":"nvd","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"cwes":[],"description":"In the Linux kernel, the following vulnerability has been resolved:\n\nllc: do not use skb_get() before dev_queue_xmit()\n\nsyzbot is able to crash hosts [1], using llc and devices\nnot supporting IFF_TX_SKB_SHARING.\n\nIn this case, e1000 driver calls eth_skb_pad(), while\nthe skb is shared.\n\nSimply replace skb_get() by skb_clone() in net/llc/llc_s_ac.c\n\nNote that e1000 driver might have an issue with pktgen,\nbecause it does not clear IFF_TX_SKB_SHARING, this is an\northogonal change.\n\nWe need to audit other skb_get() uses in net/llc.\n\n[1]\n\nkernel BUG at net/core/skbuff.c:2178 !\nOops: invalid opcode: 0000 [#1] PREEMPT SMP KASAN NOPTI\nCPU: 0 UID: 0 PID: 16371 Comm: syz.2.2764 Not tainted 6.14.0-rc4-syzkaller-00052-gac9c34d1e45a #0\nHardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014\n RIP: 0010:pskb_expand_head+0x6ce/0x1240 net/core/skbuff.c:2178\nCall Trace:\n \u003cTASK\u003e\n  __skb_pad+0x18a/0x610 net/core/skbuff.c:2466\n  __skb_put_padto include/linux/skbuff.h:3843 [inline]\n  skb_put_padto include/linux/skbuff.h:3862 [inline]\n  eth_skb_pad include/linux/etherdevice.h:656 [inline]\n  e1000_xmit_frame+0x2d99/0x5800 drivers/net/ethernet/intel/e1000/e1000_main.c:3128\n  __netdev_start_xmit include/linux/netdevice.h:5151 [inline]\n  netdev_start_xmit include/linux/netdevice.h:5160 [inline]\n  xmit_one net/core/dev.c:3806 [inline]\n  dev_hard_start_xmit+0x9a/0x7b0 net/core/dev.c:3822\n  sch_direct_xmit+0x1ae/0xc30 net/sched/sch_generic.c:343\n  __dev_xmit_skb net/core/dev.c:4045 [inline]\n  __dev_queue_xmit+0x13d4/0x43e0 net/core/dev.c:4621\n  dev_queue_xmit include/linux/netdevice.h:3313 [inline]\n  llc_sap_action_send_test_c+0x268/0x320 net/llc/llc_s_ac.c:144\n  llc_exec_sap_trans_actions net/llc/llc_sap.c:153 [inline]\n  llc_sap_next_state net/llc/llc_sap.c:182 [inline]\n  llc_sap_state_process+0x239/0x510 net/llc/llc_sap.c:209\n  llc_ui_sendmsg+0xd0d/0x14e0 net/llc/af_llc.c:993\n  sock_sendmsg_nosec net/socket.c:718 [inline]","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":"llc: do not use skb_get() before dev_queue_xmit()","id":"CVE-2025-21925","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":"linux:linux_kernel","products":["linux:linux_kernel"],"type":"denial_of_service","year":"2025"},"n_packages":0,"n_references":8,"next":{"headline":"net: gso: fix ownership in __udp_gso_segment","id":"CVE-2025-21926"},"packages":[],"prev":{"headline":"net: hns3: make sure ptp clock is unregister and freed if hclge_ptp_get_cycle returns an error","id":"CVE-2025-21924"},"products":["Linux"],"published":"2025-04-01","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":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":null,"exploitation":null,"technical_impact":null},"state":"PUBLISHED","updated":"2026-10-15","vendors":["Linux"]},"summary":"A flaw in the Linux kernel LLC protocol allows local attackers to crash the system by triggering a kernel bug via network transmission.","url":"https://insights.sbomify.com/CVE-2025-21925/"}