GHSA-7QHG-WPC6-3FF5
Vulnerability from github – Published: 2025-08-12 18:31 – Updated: 2025-11-03 18:31In the Linux kernel, the following vulnerability has been resolved:
xfrm: interface: fix use-after-free after changing collect_md xfrm interface
collect_md property on xfrm interfaces can only be set on device creation, thus xfrmi_changelink() should fail when called on such interfaces.
The check to enforce this was done only in the case where the xi was returned from xfrmi_locate() which doesn't look for the collect_md interface, and thus the validation was never reached.
Calling changelink would thus errornously place the special interface xi in the xfrmi_net->xfrmi hash, but since it also exists in the xfrmi_net->collect_md_xfrmi pointer it would lead to a double free when the net namespace was taken down [1].
Change the check to use the xi from netdev_priv which is available earlier in the function to prevent changes in xfrm collect_md interfaces.
[1] resulting oops: [ 8.516540] kernel BUG at net/core/dev.c:12029! [ 8.516552] Oops: invalid opcode: 0000 [#1] SMP NOPTI [ 8.516559] CPU: 0 UID: 0 PID: 12 Comm: kworker/u80:0 Not tainted 6.15.0-virtme #5 PREEMPT(voluntary) [ 8.516565] Hardware name: QEMU Ubuntu 24.04 PC (i440FX + PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 8.516569] Workqueue: netns cleanup_net [ 8.516579] RIP: 0010:unregister_netdevice_many_notify+0x101/0xab0 [ 8.516590] Code: 90 0f 0b 90 48 8b b0 78 01 00 00 48 8b 90 80 01 00 00 48 89 56 08 48 89 32 4c 89 80 78 01 00 00 48 89 b8 80 01 00 00 eb ac 90 <0f> 0b 48 8b 45 00 4c 8d a0 88 fe ff ff 48 39 c5 74 5c 41 80 bc 24 [ 8.516593] RSP: 0018:ffffa93b8006bd30 EFLAGS: 00010206 [ 8.516598] RAX: ffff98fe4226e000 RBX: ffffa93b8006bd58 RCX: ffffa93b8006bc60 [ 8.516601] RDX: 0000000000000004 RSI: 0000000000000000 RDI: dead000000000122 [ 8.516603] RBP: ffffa93b8006bdd8 R08: dead000000000100 R09: ffff98fe4133c100 [ 8.516605] R10: 0000000000000000 R11: 00000000000003d2 R12: ffffa93b8006be00 [ 8.516608] R13: ffffffff96c1a510 R14: ffffffff96c1a510 R15: ffffa93b8006be00 [ 8.516615] FS: 0000000000000000(0000) GS:ffff98fee73b7000(0000) knlGS:0000000000000000 [ 8.516619] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 8.516622] CR2: 00007fcd2abd0700 CR3: 000000003aa40000 CR4: 0000000000752ef0 [ 8.516625] PKRU: 55555554 [ 8.516627] Call Trace: [ 8.516632] [ 8.516635] ? rtnl_is_locked+0x15/0x20 [ 8.516641] ? unregister_netdevice_queue+0x29/0xf0 [ 8.516650] ops_undo_list+0x1f2/0x220 [ 8.516659] cleanup_net+0x1ad/0x2e0 [ 8.516664] process_one_work+0x160/0x380 [ 8.516673] worker_thread+0x2aa/0x3c0 [ 8.516679] ? __pfx_worker_thread+0x10/0x10 [ 8.516686] kthread+0xfb/0x200 [ 8.516690] ? __pfx_kthread+0x10/0x10 [ 8.516693] ? __pfx_kthread+0x10/0x10 [ 8.516697] ret_from_fork+0x82/0xf0 [ 8.516705] ? __pfx_kthread+0x10/0x10 [ 8.516709] ret_from_fork_asm+0x1a/0x30 [ 8.516718]
{
"affected": [],
"aliases": [
"CVE-2025-38500"
],
"database_specific": {
"cwe_ids": [
"CWE-416"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2025-08-12T16:15:27Z",
"severity": "HIGH"
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nxfrm: interface: fix use-after-free after changing collect_md xfrm interface\n\ncollect_md property on xfrm interfaces can only be set on device creation,\nthus xfrmi_changelink() should fail when called on such interfaces.\n\nThe check to enforce this was done only in the case where the xi was\nreturned from xfrmi_locate() which doesn\u0027t look for the collect_md\ninterface, and thus the validation was never reached.\n\nCalling changelink would thus errornously place the special interface xi\nin the xfrmi_net-\u003exfrmi hash, but since it also exists in the\nxfrmi_net-\u003ecollect_md_xfrmi pointer it would lead to a double free when\nthe net namespace was taken down [1].\n\nChange the check to use the xi from netdev_priv which is available earlier\nin the function to prevent changes in xfrm collect_md interfaces.\n\n[1] resulting oops:\n[ 8.516540] kernel BUG at net/core/dev.c:12029!\n[ 8.516552] Oops: invalid opcode: 0000 [#1] SMP NOPTI\n[ 8.516559] CPU: 0 UID: 0 PID: 12 Comm: kworker/u80:0 Not tainted 6.15.0-virtme #5 PREEMPT(voluntary)\n[ 8.516565] Hardware name: QEMU Ubuntu 24.04 PC (i440FX + PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014\n[ 8.516569] Workqueue: netns cleanup_net\n[ 8.516579] RIP: 0010:unregister_netdevice_many_notify+0x101/0xab0\n[ 8.516590] Code: 90 0f 0b 90 48 8b b0 78 01 00 00 48 8b 90 80 01 00 00 48 89 56 08 48 89 32 4c 89 80 78 01 00 00 48 89 b8 80 01 00 00 eb ac 90 \u003c0f\u003e 0b 48 8b 45 00 4c 8d a0 88 fe ff ff 48 39 c5 74 5c 41 80 bc 24\n[ 8.516593] RSP: 0018:ffffa93b8006bd30 EFLAGS: 00010206\n[ 8.516598] RAX: ffff98fe4226e000 RBX: ffffa93b8006bd58 RCX: ffffa93b8006bc60\n[ 8.516601] RDX: 0000000000000004 RSI: 0000000000000000 RDI: dead000000000122\n[ 8.516603] RBP: ffffa93b8006bdd8 R08: dead000000000100 R09: ffff98fe4133c100\n[ 8.516605] R10: 0000000000000000 R11: 00000000000003d2 R12: ffffa93b8006be00\n[ 8.516608] R13: ffffffff96c1a510 R14: ffffffff96c1a510 R15: ffffa93b8006be00\n[ 8.516615] FS: 0000000000000000(0000) GS:ffff98fee73b7000(0000) knlGS:0000000000000000\n[ 8.516619] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n[ 8.516622] CR2: 00007fcd2abd0700 CR3: 000000003aa40000 CR4: 0000000000752ef0\n[ 8.516625] PKRU: 55555554\n[ 8.516627] Call Trace:\n[ 8.516632] \u003cTASK\u003e\n[ 8.516635] ? rtnl_is_locked+0x15/0x20\n[ 8.516641] ? unregister_netdevice_queue+0x29/0xf0\n[ 8.516650] ops_undo_list+0x1f2/0x220\n[ 8.516659] cleanup_net+0x1ad/0x2e0\n[ 8.516664] process_one_work+0x160/0x380\n[ 8.516673] worker_thread+0x2aa/0x3c0\n[ 8.516679] ? __pfx_worker_thread+0x10/0x10\n[ 8.516686] kthread+0xfb/0x200\n[ 8.516690] ? __pfx_kthread+0x10/0x10\n[ 8.516693] ? __pfx_kthread+0x10/0x10\n[ 8.516697] ret_from_fork+0x82/0xf0\n[ 8.516705] ? __pfx_kthread+0x10/0x10\n[ 8.516709] ret_from_fork_asm+0x1a/0x30\n[ 8.516718] \u003c/TASK\u003e",
"id": "GHSA-7qhg-wpc6-3ff5",
"modified": "2025-11-03T18:31:33Z",
"published": "2025-08-12T18:31:25Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-38500"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/5918c3f4800a3aef2173865e5903370f21e24f47"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/69a31f7a6a81f5ffd3812c442e09ff0be22960f1"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/a8d4748b954584ab7bd800f1a4e46d5b0eeb5ce4"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/a90b2a1aaacbcf0f91d7e4868ad6c51c5dee814b"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/bfebdb85496e1da21d3cf05de099210915c3e706"
},
{
"type": "WEB",
"url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
}
]
}
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