{"id":"CVE-2025-21865","title":"In the Linux kernel, the following vulnerability has been resolved:\n\ngtp: Suppress list corruption splat in gtp_net_exit_batch_rtnl().\n\nBrad Spengler reported the list_del() corruption splat in\ngtp_net_exit_batch_rtnl()","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\ngtp: Suppress list corruption splat in gtp_net_exit_batch_rtnl().\n\nBrad Spengler reported the list_del() corruption splat in\ngtp_net_exit_batch_rtnl(). [0]\n\nCommit eb28…","severity":"medium","cvss":5.5,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","cwe":["CWE-787"],"vendor":"linux","product":"linux_kernel","affected":["linux_kernel >= 6.1.127, < 6.1.130","linux_kernel >= 6.6.74, < 6.6.80","linux_kernel >= 6.12.11, < 6.12.17","linux_kernel >= 6.13, < 6.13.5","linux_kernel = 5.4.290","linux_kernel = 5.10.234","linux_kernel = 5.15.177","linux_kernel = 6.14"],"patched":["linux_kernel 6.13.5"],"published":"2025-03-12","updated":"2026-10-15","sourceUpdated":"2026-10-15T02:17:40.350","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2025-21865","references":[{"url":"https://git.kernel.org/stable/c/33eb925c0c26e86ca540a08254806512bf911f22","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/37e7644b961600ef0beb01d3970c3034a62913af","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/4ccacf86491d33d2486b62d4d44864d7101b299d","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/7f86fb07db65a470d0c11f79da551bd9466357dc","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/9d03e7e37187ae140e716377599493987fb20c5b","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/b70fa591b066d52b141fc430ffdee35b6cc87a66","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/cb15bb1bde0ba97cbbed9508e45210dcafec3657","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/ff81b14010362f6188ca26fec22ff05e4da45595","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://cert-portal.siemens.com/productcert/html/ssa-082556.html","label":"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"},{"url":"https://cert-portal.siemens.com/productcert/html/ssa-265688.html","label":"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"},{"url":"https://cert-portal.siemens.com/productcert/html/ssa-784472.html","label":"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"}],"tags":["nvd","cve.org"],"epss":0.00252,"epssPercentile":0.16575,"ingestedAt":"2026-10-15T03:30:12.807Z","ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2025-10-01T19:25:29.794279Z"},"slug":"CVE-2025-21865","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\ngtp: Suppress list corruption splat in gtp_net_exit_batch_rtnl().\n\nBrad Spengler reported the list_del() corruption splat in\ngtp_net_exit_batch_rtnl(). [0]\n\nCommit eb28fd76c0a0 (\"gtp: Destroy device along with udp socket's netns\ndismantle.\") added the for_each_netdev() loop in gtp_net_exit_batch_rtnl()\nto destroy devices in each netns as done in geneve and ip tunnels.\n\nHowever, this could trigger ->dellink() twice for the same device during\n->exit_batch_rtnl().\n\nSay we have two netns A & B and gtp device B that resides in netns B but\nwhose UDP socket is in netns A.\n\n  1. cleanup_net() processes netns A and then B.\n\n  2. gtp_net_exit_batch_rtnl() finds the device B while iterating\n     netns A's gn->gtp_dev_list and calls ->dellink().\n\n  [ device B is not yet unlinked from netns B\n    as unregister_netdevice_many() has not been called. ]\n\n  3. gtp_net_exit_batch_rtnl() finds the device B while iterating\n     netns B's for_each_netdev() and calls ->dellink().\n\ngtp_dellink() cleans up the device's hash table, unlinks the dev from\ngn->gtp_dev_list, and calls unregister_netdevice_queue().\n\nBasically, calling gtp_dellink() multiple times is fine unless\nCONFIG_DEBUG_LIST is enabled.\n\nLet's remove for_each_netdev() in gtp_net_exit_batch_rtnl() and\ndelegate the destruction to default_device_exit_batch() as done\nin bareudp.\n\n[0]:\nlist_del corruption, ffff8880aaa62c00->next (autoslab_size_M_dev_P_net_core_dev_11127_8_1328_8_S_4096_A_64_n_139+0xc00/0x1000 [slab object]) is LIST_POISON1 (ffffffffffffff02) (prev is 0xffffffffffffff04)\nkernel BUG at lib/list_debug.c:58!\nOops: invalid opcode: 0000 [#1] PREEMPT SMP KASAN\nCPU: 1 UID: 0 PID: 1804 Comm: kworker/u8:7 Tainted: G                T   6.12.13-grsec-full-20250211091339 #1\nTainted: [T]=RANDSTRUCT\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014\nWorkqueue: netns cleanup_net\nRIP: 0010:[<ffffffff84947381>] __list_del_entry_valid_or_report+0x141/0x200 lib/list_debug.c:58\nCode: c2 76 91 31 c0 e8 9f b1 f7 fc 0f 0b 4d 89 f0 48 c7 c1 02 ff ff ff 48 89 ea 48 89 ee 48 c7 c7 e0 c2 76 91 31 c0 e8 7f b1 f7 fc <0f> 0b 4d 89 e8 48 c7 c1 04 ff ff ff 48 89 ea 48 89 ee 48 c7 c7 60\nRSP: 0018:fffffe8040b4fbd0 EFLAGS: 00010283\nRAX: 00000000000000cc RBX: dffffc0000000000 RCX: ffffffff818c4054\nRDX: ffffffff84947381 RSI: ffffffff818d1512 RDI: 0000000000000000\nRBP: ffff8880aaa62c00 R08: 0000000000000001 R09: fffffbd008169f32\nR10: fffffe8040b4f997 R11: 0000000000000001 R12: a1988d84f24943e4\nR13: ffffffffffffff02 R14: ffffffffffffff04 R15: ffff8880aaa62c08\nRBX: kasan shadow of 0x0\nRCX: __wake_up_klogd.part.0+0x74/0xe0 kernel/printk/printk.c:4554\nRDX: __list_del_entry_valid_or_report+0x141/0x200 lib/list_debug.c:58\nRSI: vprintk+0x72/0x100 kernel/printk/printk_safe.c:71\nRBP: autoslab_size_M_dev_P_net_core_dev_11127_8_1328_8_S_4096_A_64_n_139+0xc00/0x1000 [slab object]\nRSP: process kstack fffffe8040b4fbd0+0x7bd0/0x8000 [kworker/u8:7+netns 1804 ]\nR09: kasan shadow of process kstack fffffe8040b4f990+0x7990/0x8000 [kworker/u8:7+netns 1804 ]\nR10: process kstack fffffe8040b4f997+0x7997/0x8000 [kworker/u8:7+netns 1804 ]\nR15: autoslab_size_M_dev_P_net_core_dev_11127_8_1328_8_S_4096_A_64_n_139+0xc08/0x1000 [slab object]\nFS:  0000000000000000(0000) GS:ffff888116000000(0000) knlGS:0000000000000000\nCS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\nCR2: 0000748f5372c000 CR3: 0000000015408000 CR4: 00000000003406f0 shadow CR4: 00000000003406f0\nStack:\n 0000000000000000 ffffffff8a0c35e7 ffffffff8a0c3603 ffff8880aaa62c00\n ffff8880aaa62c00 0000000000000004 ffff88811145311c 0000000000000005\n 0000000000000001 ffff8880aaa62000 fffffe8040b4fd40 ffffffff8a0c360d\nCall Trace:\n <TASK>\n [<ffffffff8a0c360d>] __list_del_entry_valid include/linux/list.h:131 [inline] fffffe8040b4fc28\n [<ffffffff8a0c360d>] __list_del_entry include/linux/list.h:248 [inline] fffffe8040b4fc28\n [<ffffffff8a0c360d>] list_del include/linux/list.h:262 [inl\n---truncated---\n\n## Affected\n\n- `linux_kernel >= 6.1.127, < 6.1.130`\n- `linux_kernel >= 6.6.74, < 6.6.80`\n- `linux_kernel >= 6.12.11, < 6.12.17`\n- `linux_kernel >= 6.13, < 6.13.5`\n- `linux_kernel = 5.4.290`\n- `linux_kernel = 5.10.234`\n- `linux_kernel = 5.15.177`\n- `linux_kernel = 6.14`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `linux_kernel 6.13.5`","depth":"sunlit","depthScore":30,"depthScoreParts":{"impact":30.3,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}