{"id":"CVE-2025-21925","summary":"llc: do not use skb_get() before dev_queue_xmit()","details":"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]","modified":"2026-04-02T12:45:17.374926Z","published":"2025-04-01T15:40:57.355Z","related":["SUSE-SU-2025:01614-1","SUSE-SU-2025:01707-1","SUSE-SU-2025:01919-1","SUSE-SU-2025:01951-1","SUSE-SU-2025:01964-1","SUSE-SU-2025:01967-1","SUSE-SU-2025:20343-1","SUSE-SU-2025:20344-1","SUSE-SU-2025:20354-1","SUSE-SU-2025:20355-1"],"database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/21xxx/CVE-2025-21925.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/056e8a46d79e22983bae4267e0d9c52927076f46"},{"type":"WEB","url":"https://git.kernel.org/stable/c/0f764208dc24ea043c3e20194d32aebf94f8459c"},{"type":"WEB","url":"https://git.kernel.org/stable/c/13f3f872627f0f27c31245524fc11367756240ad"},{"type":"WEB","url":"https://git.kernel.org/stable/c/17f86e25431ebc15aa9245ff156414fdad47822d"},{"type":"WEB","url":"https://git.kernel.org/stable/c/416e8b4c20c6398044e93008deefd563289f477d"},{"type":"WEB","url":"https://git.kernel.org/stable/c/64e6a754d33d31aa844b3ee66fb93ac84ca1565e"},{"type":"WEB","url":"https://git.kernel.org/stable/c/9b6f083db141ece0024be01526aa05aa978811cb"},{"type":"WEB","url":"https://git.kernel.org/stable/c/cd1c44327bbbd50fc24f2b38892f5f328b784d0f"},{"type":"WEB","url":"https://lists.debian.org/debian-lts-announce/2025/05/msg00030.html"},{"type":"WEB","url":"https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/21xxx/CVE-2025-21925.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-21925"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2"},{"fixed":"cd1c44327bbbd50fc24f2b38892f5f328b784d0f"},{"fixed":"13f3f872627f0f27c31245524fc11367756240ad"},{"fixed":"9b6f083db141ece0024be01526aa05aa978811cb"},{"fixed":"17f86e25431ebc15aa9245ff156414fdad47822d"},{"fixed":"416e8b4c20c6398044e93008deefd563289f477d"},{"fixed":"0f764208dc24ea043c3e20194d32aebf94f8459c"},{"fixed":"056e8a46d79e22983bae4267e0d9c52927076f46"},{"fixed":"64e6a754d33d31aa844b3ee66fb93ac84ca1565e"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-21925.json"}}],"schema_version":"1.7.5"}