CVE-2025-38684 (GCVE-0-2025-38684)
Vulnerability from cvelistv5
Published
2025-09-04 15:32
Modified
2025-09-29 05:55
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: net/sched: ets: use old 'nbands' while purging unused classes Shuang reported sch_ets test-case [1] crashing in ets_class_qlen_notify() after recent changes from Lion [2]. The problem is: in ets_qdisc_change() we purge unused DWRR queues; the value of 'q->nbands' is the new one, and the cleanup should be done with the old one. The problem is here since my first attempts to fix ets_qdisc_change(), but it surfaced again after the recent qdisc len accounting fixes. Fix it purging idle DWRR queues before assigning a new value of 'q->nbands', so that all purge operations find a consistent configuration: - old 'q->nbands' because it's needed by ets_class_find() - old 'q->nstrict' because it's needed by ets_class_is_strict() BUG: kernel NULL pointer dereference, address: 0000000000000000 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page PGD 0 P4D 0 Oops: Oops: 0000 [#1] SMP NOPTI CPU: 62 UID: 0 PID: 39457 Comm: tc Kdump: loaded Not tainted 6.12.0-116.el10.x86_64 #1 PREEMPT(voluntary) Hardware name: Dell Inc. PowerEdge R640/06DKY5, BIOS 2.12.2 07/09/2021 RIP: 0010:__list_del_entry_valid_or_report+0x4/0x80 Code: ff 4c 39 c7 0f 84 39 19 8e ff b8 01 00 00 00 c3 cc cc cc cc 66 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa <48> 8b 17 48 8b 4f 08 48 85 d2 0f 84 56 19 8e ff 48 85 c9 0f 84 ab RSP: 0018:ffffba186009f400 EFLAGS: 00010202 RAX: 00000000000000d6 RBX: 0000000000000000 RCX: 0000000000000004 RDX: ffff9f0fa29b69c0 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffffffc12c2400 R08: 0000000000000008 R09: 0000000000000004 R10: ffffffffffffffff R11: 0000000000000004 R12: 0000000000000000 R13: ffff9f0f8cfe0000 R14: 0000000000100005 R15: 0000000000000000 FS: 00007f2154f37480(0000) GS:ffff9f269c1c0000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 00000001530be001 CR4: 00000000007726f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 PKRU: 55555554 Call Trace: <TASK> ets_class_qlen_notify+0x65/0x90 [sch_ets] qdisc_tree_reduce_backlog+0x74/0x110 ets_qdisc_change+0x630/0xa40 [sch_ets] __tc_modify_qdisc.constprop.0+0x216/0x7f0 tc_modify_qdisc+0x7c/0x120 rtnetlink_rcv_msg+0x145/0x3f0 netlink_rcv_skb+0x53/0x100 netlink_unicast+0x245/0x390 netlink_sendmsg+0x21b/0x470 ____sys_sendmsg+0x39d/0x3d0 ___sys_sendmsg+0x9a/0xe0 __sys_sendmsg+0x7a/0xd0 do_syscall_64+0x7d/0x160 entry_SYSCALL_64_after_hwframe+0x76/0x7e RIP: 0033:0x7f2155114084 Code: 89 02 b8 ff ff ff ff eb bb 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 f3 0f 1e fa 80 3d 25 f0 0c 00 00 74 13 b8 2e 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 54 c3 0f 1f 00 48 83 ec 28 89 54 24 1c 48 89 RSP: 002b:00007fff1fd7a988 EFLAGS: 00000202 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 0000560ec063e5e0 RCX: 00007f2155114084 RDX: 0000000000000000 RSI: 00007fff1fd7a9f0 RDI: 0000000000000003 RBP: 00007fff1fd7aa60 R08: 0000000000000010 R09: 000000000000003f R10: 0000560ee9b3a010 R11: 0000000000000202 R12: 00007fff1fd7aae0 R13: 000000006891ccde R14: 0000560ec063e5e0 R15: 00007fff1fd7aad0 </TASK> [1] https://lore.kernel.org/netdev/e08c7f4a6882f260011909a868311c6e9b54f3e4.1639153474.git.dcaratti@redhat.com/ [2] https://lore.kernel.org/netdev/d912cbd7-193b-4269-9857-525bee8bbb6a@gmail.com/
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5b3b346bc4c2aa2c428735438a11989d251f32f1
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/84a24fb446ee07b22b64aae6f0e3f4a38266310a
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/87c6efc5ce9c126ae4a781bc04504b83780e3650
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/970c1c731c4ede46d05f5b0355724d1e400cfbca
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/97ec167cd2e8a81a2d87331a2ed92daf007542c8
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/bdfddcde86e8b9245d9c0c2efe2b6fe8dcf6bf41
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/be9692dafdfb36d9c43afd9d4e1d9d9ba8e7b51b
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d69f4a258cd91b3bcef7089eb0401005aae2aed5
Impacted products
Vendor Product Version
Linux Linux Version: dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33
Version: dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33
Version: dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33
Version: dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33
Version: dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33
Version: dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33
Version: dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33
Version: dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33
Version: 3b290923ad2b23596208c1e29520badef4356a43
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{
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: ets: use old \u0027nbands\u0027 while purging unused classes\n\nShuang reported sch_ets test-case [1] crashing in ets_class_qlen_notify()\nafter recent changes from Lion [2]. The problem is: in ets_qdisc_change()\nwe purge unused DWRR queues; the value of \u0027q-\u003enbands\u0027 is the new one, and\nthe cleanup should be done with the old one. The problem is here since my\nfirst attempts to fix ets_qdisc_change(), but it surfaced again after the\nrecent qdisc len accounting fixes. Fix it purging idle DWRR queues before\nassigning a new value of \u0027q-\u003enbands\u0027, so that all purge operations find a\nconsistent configuration:\n\n - old \u0027q-\u003enbands\u0027 because it\u0027s needed by ets_class_find()\n - old \u0027q-\u003enstrict\u0027 because it\u0027s needed by ets_class_is_strict()\n\n BUG: kernel NULL pointer dereference, address: 0000000000000000\n #PF: supervisor read access in kernel mode\n #PF: error_code(0x0000) - not-present page\n PGD 0 P4D 0\n Oops: Oops: 0000 [#1] SMP NOPTI\n CPU: 62 UID: 0 PID: 39457 Comm: tc Kdump: loaded Not tainted 6.12.0-116.el10.x86_64 #1 PREEMPT(voluntary)\n Hardware name: Dell Inc. PowerEdge R640/06DKY5, BIOS 2.12.2 07/09/2021\n RIP: 0010:__list_del_entry_valid_or_report+0x4/0x80\n Code: ff 4c 39 c7 0f 84 39 19 8e ff b8 01 00 00 00 c3 cc cc cc cc 66 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa \u003c48\u003e 8b 17 48 8b 4f 08 48 85 d2 0f 84 56 19 8e ff 48 85 c9 0f 84 ab\n RSP: 0018:ffffba186009f400 EFLAGS: 00010202\n RAX: 00000000000000d6 RBX: 0000000000000000 RCX: 0000000000000004\n RDX: ffff9f0fa29b69c0 RSI: 0000000000000000 RDI: 0000000000000000\n RBP: ffffffffc12c2400 R08: 0000000000000008 R09: 0000000000000004\n R10: ffffffffffffffff R11: 0000000000000004 R12: 0000000000000000\n R13: ffff9f0f8cfe0000 R14: 0000000000100005 R15: 0000000000000000\n FS:  00007f2154f37480(0000) GS:ffff9f269c1c0000(0000) knlGS:0000000000000000\n CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n CR2: 0000000000000000 CR3: 00000001530be001 CR4: 00000000007726f0\n DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\n DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\n PKRU: 55555554\n Call Trace:\n  \u003cTASK\u003e\n  ets_class_qlen_notify+0x65/0x90 [sch_ets]\n  qdisc_tree_reduce_backlog+0x74/0x110\n  ets_qdisc_change+0x630/0xa40 [sch_ets]\n  __tc_modify_qdisc.constprop.0+0x216/0x7f0\n  tc_modify_qdisc+0x7c/0x120\n  rtnetlink_rcv_msg+0x145/0x3f0\n  netlink_rcv_skb+0x53/0x100\n  netlink_unicast+0x245/0x390\n  netlink_sendmsg+0x21b/0x470\n  ____sys_sendmsg+0x39d/0x3d0\n  ___sys_sendmsg+0x9a/0xe0\n  __sys_sendmsg+0x7a/0xd0\n  do_syscall_64+0x7d/0x160\n  entry_SYSCALL_64_after_hwframe+0x76/0x7e\n RIP: 0033:0x7f2155114084\n Code: 89 02 b8 ff ff ff ff eb bb 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 f3 0f 1e fa 80 3d 25 f0 0c 00 00 74 13 b8 2e 00 00 00 0f 05 \u003c48\u003e 3d 00 f0 ff ff 77 54 c3 0f 1f 00 48 83 ec 28 89 54 24 1c 48 89\n RSP: 002b:00007fff1fd7a988 EFLAGS: 00000202 ORIG_RAX: 000000000000002e\n RAX: ffffffffffffffda RBX: 0000560ec063e5e0 RCX: 00007f2155114084\n RDX: 0000000000000000 RSI: 00007fff1fd7a9f0 RDI: 0000000000000003\n RBP: 00007fff1fd7aa60 R08: 0000000000000010 R09: 000000000000003f\n R10: 0000560ee9b3a010 R11: 0000000000000202 R12: 00007fff1fd7aae0\n R13: 000000006891ccde R14: 0000560ec063e5e0 R15: 00007fff1fd7aad0\n  \u003c/TASK\u003e\n\n [1] https://lore.kernel.org/netdev/e08c7f4a6882f260011909a868311c6e9b54f3e4.1639153474.git.dcaratti@redhat.com/\n [2] https://lore.kernel.org/netdev/d912cbd7-193b-4269-9857-525bee8bbb6a@gmail.com/"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-09-29T05:55:56.243Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/bdfddcde86e8b9245d9c0c2efe2b6fe8dcf6bf41"
        },
        {
          "url": "https://git.kernel.org/stable/c/be9692dafdfb36d9c43afd9d4e1d9d9ba8e7b51b"
        },
        {
          "url": "https://git.kernel.org/stable/c/97ec167cd2e8a81a2d87331a2ed92daf007542c8"
        },
        {
          "url": "https://git.kernel.org/stable/c/84a24fb446ee07b22b64aae6f0e3f4a38266310a"
        },
        {
          "url": "https://git.kernel.org/stable/c/5b3b346bc4c2aa2c428735438a11989d251f32f1"
        },
        {
          "url": "https://git.kernel.org/stable/c/d69f4a258cd91b3bcef7089eb0401005aae2aed5"
        },
        {
          "url": "https://git.kernel.org/stable/c/970c1c731c4ede46d05f5b0355724d1e400cfbca"
        },
        {
          "url": "https://git.kernel.org/stable/c/87c6efc5ce9c126ae4a781bc04504b83780e3650"
        }
      ],
      "title": "net/sched: ets: use old \u0027nbands\u0027 while purging unused classes",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-38684",
    "datePublished": "2025-09-04T15:32:38.927Z",
    "dateReserved": "2025-04-16T04:51:24.032Z",
    "dateUpdated": "2025-09-29T05:55:56.243Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-38684\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-09-04T16:15:36.210\",\"lastModified\":\"2025-09-05T17:47:24.833\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnet/sched: ets: use old \u0027nbands\u0027 while purging unused classes\\n\\nShuang reported sch_ets test-case [1] crashing in ets_class_qlen_notify()\\nafter recent changes from Lion [2]. The problem is: in ets_qdisc_change()\\nwe purge unused DWRR queues; the value of \u0027q-\u003enbands\u0027 is the new one, and\\nthe cleanup should be done with the old one. The problem is here since my\\nfirst attempts to fix ets_qdisc_change(), but it surfaced again after the\\nrecent qdisc len accounting fixes. Fix it purging idle DWRR queues before\\nassigning a new value of \u0027q-\u003enbands\u0027, so that all purge operations find a\\nconsistent configuration:\\n\\n - old \u0027q-\u003enbands\u0027 because it\u0027s needed by ets_class_find()\\n - old \u0027q-\u003enstrict\u0027 because it\u0027s needed by ets_class_is_strict()\\n\\n BUG: kernel NULL pointer dereference, address: 0000000000000000\\n #PF: supervisor read access in kernel mode\\n #PF: error_code(0x0000) - not-present page\\n PGD 0 P4D 0\\n Oops: Oops: 0000 [#1] SMP NOPTI\\n CPU: 62 UID: 0 PID: 39457 Comm: tc Kdump: loaded Not tainted 6.12.0-116.el10.x86_64 #1 PREEMPT(voluntary)\\n Hardware name: Dell Inc. PowerEdge R640/06DKY5, BIOS 2.12.2 07/09/2021\\n RIP: 0010:__list_del_entry_valid_or_report+0x4/0x80\\n Code: ff 4c 39 c7 0f 84 39 19 8e ff b8 01 00 00 00 c3 cc cc cc cc 66 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa \u003c48\u003e 8b 17 48 8b 4f 08 48 85 d2 0f 84 56 19 8e ff 48 85 c9 0f 84 ab\\n RSP: 0018:ffffba186009f400 EFLAGS: 00010202\\n RAX: 00000000000000d6 RBX: 0000000000000000 RCX: 0000000000000004\\n RDX: ffff9f0fa29b69c0 RSI: 0000000000000000 RDI: 0000000000000000\\n RBP: ffffffffc12c2400 R08: 0000000000000008 R09: 0000000000000004\\n R10: ffffffffffffffff R11: 0000000000000004 R12: 0000000000000000\\n R13: ffff9f0f8cfe0000 R14: 0000000000100005 R15: 0000000000000000\\n FS:  00007f2154f37480(0000) GS:ffff9f269c1c0000(0000) knlGS:0000000000000000\\n CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\\n CR2: 0000000000000000 CR3: 00000001530be001 CR4: 00000000007726f0\\n DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\\n DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\\n PKRU: 55555554\\n Call Trace:\\n  \u003cTASK\u003e\\n  ets_class_qlen_notify+0x65/0x90 [sch_ets]\\n  qdisc_tree_reduce_backlog+0x74/0x110\\n  ets_qdisc_change+0x630/0xa40 [sch_ets]\\n  __tc_modify_qdisc.constprop.0+0x216/0x7f0\\n  tc_modify_qdisc+0x7c/0x120\\n  rtnetlink_rcv_msg+0x145/0x3f0\\n  netlink_rcv_skb+0x53/0x100\\n  netlink_unicast+0x245/0x390\\n  netlink_sendmsg+0x21b/0x470\\n  ____sys_sendmsg+0x39d/0x3d0\\n  ___sys_sendmsg+0x9a/0xe0\\n  __sys_sendmsg+0x7a/0xd0\\n  do_syscall_64+0x7d/0x160\\n  entry_SYSCALL_64_after_hwframe+0x76/0x7e\\n RIP: 0033:0x7f2155114084\\n Code: 89 02 b8 ff ff ff ff eb bb 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 f3 0f 1e fa 80 3d 25 f0 0c 00 00 74 13 b8 2e 00 00 00 0f 05 \u003c48\u003e 3d 00 f0 ff ff 77 54 c3 0f 1f 00 48 83 ec 28 89 54 24 1c 48 89\\n RSP: 002b:00007fff1fd7a988 EFLAGS: 00000202 ORIG_RAX: 000000000000002e\\n RAX: ffffffffffffffda RBX: 0000560ec063e5e0 RCX: 00007f2155114084\\n RDX: 0000000000000000 RSI: 00007fff1fd7a9f0 RDI: 0000000000000003\\n RBP: 00007fff1fd7aa60 R08: 0000000000000010 R09: 000000000000003f\\n R10: 0000560ee9b3a010 R11: 0000000000000202 R12: 00007fff1fd7aae0\\n R13: 000000006891ccde R14: 0000560ec063e5e0 R15: 00007fff1fd7aad0\\n  \u003c/TASK\u003e\\n\\n [1] https://lore.kernel.org/netdev/e08c7f4a6882f260011909a868311c6e9b54f3e4.1639153474.git.dcaratti@redhat.com/\\n [2] https://lore.kernel.org/netdev/d912cbd7-193b-4269-9857-525bee8bbb6a@gmail.com/\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/5b3b346bc4c2aa2c428735438a11989d251f32f1\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/84a24fb446ee07b22b64aae6f0e3f4a38266310a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/87c6efc5ce9c126ae4a781bc04504b83780e3650\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/970c1c731c4ede46d05f5b0355724d1e400cfbca\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/97ec167cd2e8a81a2d87331a2ed92daf007542c8\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/bdfddcde86e8b9245d9c0c2efe2b6fe8dcf6bf41\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/be9692dafdfb36d9c43afd9d4e1d9d9ba8e7b51b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d69f4a258cd91b3bcef7089eb0401005aae2aed5\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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