Vulnerability-Lookup

FKIE_CVE-2021-47419

Vulnerability from fkie_nvd - Published: 2024-05-21 15:15 - Updated: 2026-08-04 10:17

Severity

7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Summary

In the Linux kernel, the following vulnerability has been resolved: net/sched: sch_taprio: properly cancel timer from taprio_destroy() There is a comment in qdisc_create() about us not calling ops->reset() in some cases. err_out4: /* * Any broken qdiscs that would require a ops->reset() here? * The qdisc was never in action so it shouldn't be necessary. */ As taprio sets a timer before actually receiving a packet, we need to cancel it from ops->destroy, just in case ops->reset has not been called. syzbot reported: ODEBUG: free active (active state 0) object type: hrtimer hint: advance_sched+0x0/0x9a0 arch/x86/include/asm/atomic64_64.h:22 WARNING: CPU: 0 PID: 8441 at lib/debugobjects.c:505 debug_print_object+0x16e/0x250 lib/debugobjects.c:505 Modules linked in: CPU: 0 PID: 8441 Comm: syz-executor813 Not tainted 5.14.0-rc6-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:debug_print_object+0x16e/0x250 lib/debugobjects.c:505 Code: ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 af 00 00 00 48 8b 14 dd e0 d3 e3 89 4c 89 ee 48 c7 c7 e0 c7 e3 89 e8 5b 86 11 05 <0f> 0b 83 05 85 03 92 09 01 48 83 c4 18 5b 5d 41 5c 41 5d 41 5e c3 RSP: 0018:ffffc9000130f330 EFLAGS: 00010282 RAX: 0000000000000000 RBX: 0000000000000003 RCX: 0000000000000000 RDX: ffff88802baeb880 RSI: ffffffff815d87b5 RDI: fffff52000261e58 RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000 R10: ffffffff815d25ee R11: 0000000000000000 R12: ffffffff898dd020 R13: ffffffff89e3ce20 R14: ffffffff81653630 R15: dffffc0000000000 FS: 0000000000f0d300(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffb64b3e000 CR3: 0000000036557000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __debug_check_no_obj_freed lib/debugobjects.c:987 [inline] debug_check_no_obj_freed+0x301/0x420 lib/debugobjects.c:1018 slab_free_hook mm/slub.c:1603 [inline] slab_free_freelist_hook+0x171/0x240 mm/slub.c:1653 slab_free mm/slub.c:3213 [inline] kfree+0xe4/0x540 mm/slub.c:4267 qdisc_create+0xbcf/0x1320 net/sched/sch_api.c:1299 tc_modify_qdisc+0x4c8/0x1a60 net/sched/sch_api.c:1663 rtnetlink_rcv_msg+0x413/0xb80 net/core/rtnetlink.c:5571 netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2504 netlink_unicast_kernel net/netlink/af_netlink.c:1314 [inline] netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1340 netlink_sendmsg+0x86d/0xdb0 net/netlink/af_netlink.c:1929 sock_sendmsg_nosec net/socket.c:704 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:724 ____sys_sendmsg+0x6e8/0x810 net/socket.c:2403 ___sys_sendmsg+0xf3/0x170 net/socket.c:2457 __sys_sendmsg+0xe5/0x1b0 net/socket.c:2486 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80

References

URL	Tags
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/3ec73ffeef54596c32aff0e73fe60971b9c8b866	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/7a1c1af341041221b3acb9d7036cc2b43e0efa75	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/a56d447f196fa9973c568f54c0d76d5391c3b0c0	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/c951c08a5996365aecbc5f1a9bddec3905e1ddfc	Patch
af854a3a-2127-422b-91ae-364da2661108	https://git.kernel.org/stable/c/3ec73ffeef54596c32aff0e73fe60971b9c8b866	Patch
af854a3a-2127-422b-91ae-364da2661108	https://git.kernel.org/stable/c/7a1c1af341041221b3acb9d7036cc2b43e0efa75	Patch
af854a3a-2127-422b-91ae-364da2661108	https://git.kernel.org/stable/c/a56d447f196fa9973c568f54c0d76d5391c3b0c0	Patch
af854a3a-2127-422b-91ae-364da2661108	https://git.kernel.org/stable/c/c951c08a5996365aecbc5f1a9bddec3905e1ddfc	Patch

Impacted products

Vendor	Product	Version
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	5.15
linux	linux_kernel	5.15
linux	linux_kernel	5.15
linux	linux_kernel	5.15

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/sched/sch_taprio.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "c951c08a5996365aecbc5f1a9bddec3905e1ddfc",
              "status": "affected",
              "version": "c71c512f4a65267e6a18163f4df729c489a51035",
              "versionType": "git"
            },
            {
              "lessThan": "3ec73ffeef54596c32aff0e73fe60971b9c8b866",
              "status": "affected",
              "version": "a969a632cbe7165d448a5528806ad120c2599397",
              "versionType": "git"
            },
            {
              "lessThan": "7a1c1af341041221b3acb9d7036cc2b43e0efa75",
              "status": "affected",
              "version": "44d4775ca51805b376a8db5b34f650434a08e556",
              "versionType": "git"
            },
            {
              "lessThan": "a56d447f196fa9973c568f54c0d76d5391c3b0c0",
              "status": "affected",
              "version": "44d4775ca51805b376a8db5b34f650434a08e556",
              "versionType": "git"
            },
            {
              "lessThan": "5.4.153",
              "status": "affected",
              "version": "5.4.87",
              "versionType": "semver"
            },
            {
              "lessThan": "5.10.73",
              "status": "affected",
              "version": "5.10.5",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/sched/sch_taprio.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.11"
            },
            {
              "lessThan": "5.11",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.4.*",
              "status": "unaffected",
              "version": "5.4.153",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.73",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.14.*",
              "status": "unaffected",
              "version": "5.14.12",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "5.15",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "0899173F-52A9-430E-ACB1-2938E25C05D4",
              "versionEndExcluding": "5.4.153",
              "versionStartIncluding": "5.4.87",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "B38F4C5E-B71D-4F0D-9E9A-2B4AB30F596D",
              "versionEndExcluding": "5.10.73",
              "versionStartIncluding": "5.10.5",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "20EB962C-32DC-448F-A900-BCF9A726F9EB",
              "versionEndExcluding": "5.14.12",
              "versionStartIncluding": "5.11",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:5.15:rc1:*:*:*:*:*:*",
              "matchCriteriaId": "E46C74C6-B76B-4C94-A6A4-FD2FFF62D644",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:5.15:rc2:*:*:*:*:*:*",
              "matchCriteriaId": "60134C3A-06E4-48C1-B04F-2903732A4E56",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:5.15:rc3:*:*:*:*:*:*",
              "matchCriteriaId": "0460DA88-8FE1-46A2-9DDA-1F1ABA552E71",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:5.15:rc4:*:*:*:*:*:*",
              "matchCriteriaId": "AF55383D-4DF2-45DC-93F7-571F4F978EAB",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: sch_taprio: properly cancel timer from taprio_destroy()\n\nThere is a comment in qdisc_create() about us not calling ops-\u003ereset()\nin some cases.\n\nerr_out4:\n\t/*\n\t * Any broken qdiscs that would require a ops-\u003ereset() here?\n\t * The qdisc was never in action so it shouldn\u0027t be necessary.\n\t */\n\nAs taprio sets a timer before actually receiving a packet, we need\nto cancel it from ops-\u003edestroy, just in case ops-\u003ereset has not\nbeen called.\n\nsyzbot reported:\n\nODEBUG: free active (active state 0) object type: hrtimer hint: advance_sched+0x0/0x9a0 arch/x86/include/asm/atomic64_64.h:22\nWARNING: CPU: 0 PID: 8441 at lib/debugobjects.c:505 debug_print_object+0x16e/0x250 lib/debugobjects.c:505\nModules linked in:\nCPU: 0 PID: 8441 Comm: syz-executor813 Not tainted 5.14.0-rc6-syzkaller #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011\nRIP: 0010:debug_print_object+0x16e/0x250 lib/debugobjects.c:505\nCode: ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 af 00 00 00 48 8b 14 dd e0 d3 e3 89 4c 89 ee 48 c7 c7 e0 c7 e3 89 e8 5b 86 11 05 \u003c0f\u003e 0b 83 05 85 03 92 09 01 48 83 c4 18 5b 5d 41 5c 41 5d 41 5e c3\nRSP: 0018:ffffc9000130f330 EFLAGS: 00010282\nRAX: 0000000000000000 RBX: 0000000000000003 RCX: 0000000000000000\nRDX: ffff88802baeb880 RSI: ffffffff815d87b5 RDI: fffff52000261e58\nRBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000\nR10: ffffffff815d25ee R11: 0000000000000000 R12: ffffffff898dd020\nR13: ffffffff89e3ce20 R14: ffffffff81653630 R15: dffffc0000000000\nFS:  0000000000f0d300(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000\nCS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\nCR2: 00007ffb64b3e000 CR3: 0000000036557000 CR4: 00000000001506e0\nDR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\nDR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\nCall Trace:\n __debug_check_no_obj_freed lib/debugobjects.c:987 [inline]\n debug_check_no_obj_freed+0x301/0x420 lib/debugobjects.c:1018\n slab_free_hook mm/slub.c:1603 [inline]\n slab_free_freelist_hook+0x171/0x240 mm/slub.c:1653\n slab_free mm/slub.c:3213 [inline]\n kfree+0xe4/0x540 mm/slub.c:4267\n qdisc_create+0xbcf/0x1320 net/sched/sch_api.c:1299\n tc_modify_qdisc+0x4c8/0x1a60 net/sched/sch_api.c:1663\n rtnetlink_rcv_msg+0x413/0xb80 net/core/rtnetlink.c:5571\n netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2504\n netlink_unicast_kernel net/netlink/af_netlink.c:1314 [inline]\n netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1340\n netlink_sendmsg+0x86d/0xdb0 net/netlink/af_netlink.c:1929\n sock_sendmsg_nosec net/socket.c:704 [inline]\n sock_sendmsg+0xcf/0x120 net/socket.c:724\n ____sys_sendmsg+0x6e8/0x810 net/socket.c:2403\n ___sys_sendmsg+0xf3/0x170 net/socket.c:2457\n __sys_sendmsg+0xe5/0x1b0 net/socket.c:2486\n do_syscall_x64 arch/x86/entry/common.c:50 [inline]\n do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80"
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net/sched: sch_taprio: cancelar correctamente el temporizador de taprio_destroy(). Hay un comentario en qdisc_create() acerca de que no llamamos a ops-\u0026gt;reset() en algunos casos. err_out4: /* * \u00bfAlguna qdisc rota que requiera un ops-\u0026gt;reset() aqu\u00ed? * La qdisc nunca estuvo en acci\u00f3n por lo que no deber\u00eda ser necesaria. */ Como taprio establece un temporizador antes de recibir un paquete, debemos cancelarlo desde ops-\u0026gt;destroy, en caso de que no se haya llamado a ops-\u0026gt;reset. syzbot inform\u00f3: ODEBUG: libre activo (estado activo 0) tipo de objeto: hrtimer sugerencia: advanced_sched+0x0/0x9a0 arch/x86/include/asm/atomic64_64.h:22 ADVERTENCIA: CPU: 0 PID: 8441 en lib/debugobjects.c :505 debug_print_object+0x16e/0x250 lib/debugobjects.c:505 M\u00f3dulos vinculados en: CPU: 0 PID: 8441 Comm: syz-executor813 No contaminado 5.14.0-rc6-syzkaller #0 Nombre del hardware: Google Google Compute Engine/Google Compute Motor, BIOS Google 01/01/2011 RIP: 0010:debug_print_object+0x16e/0x250 lib/debugobjects.c:505 C\u00f3digo: ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 af 00 00 00 48 8b 14 dd e0 d3 e3 89 4c 89 ee 48 c7 c7 e0 c7 e3 89 e8 5b 86 11 05 \u0026lt;0f\u0026gt; 0b 83 05 85 03 92 09 01 48 83 c4 18 5b 5d 41 5c 41 5d 41 5e c3 RSP 0018:ffff c9000130f330 EFLAGS: 00010282 RAX: 0000000000000000 RBX: 00000000000000003 RCX: 0000000000000000 RDX: ffff88802baeb880 RSI: ffffffff815d87b5 RDI: fffff52000261e58 0000000000000001 R08: 0000000000000000 R09: 0000000000000000 R10: ffffffff815d25ee R11: 00000000000000000 R12: ffffffff898dd020 R13: 3ce20 R14: ffffffff81653630 R15: dffffc0000000000 FS: 0000000000f0d300( 0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffb64b3e000 CR3: 557000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 7: 0000000000000400 Seguimiento de llamadas: __debug_check_no_obj_freed lib/debugobjects.c:987 [en l\u00ednea] debug_check_no_obj_freed+0x301/0x420 lib/debugobjects.c:1018 slab_free_hook mm/slub.c:1603 [en l\u00ednea] slab_free_freelist_hook+0x171/0x240 mm/ slub.c:1653 slab_libre mm/slub.c:3213 [en l\u00ednea] kfree+0xe4/0x540 mm/slub.c:4267 qdisc_create+0xbcf/0x1320 net/sched/sch_api.c:1299 tc_modify_qdisc+0x4c8/0x1a60 net/sched/sch_api.c:1663 rtnetlink_rcv_msg+0x413/0xb80 nore/rtnetlink.c: 5571 netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c: 2504 netlink_unicast_kernel net/netlink/af_netlink.c: 1314 [netlin /0x7d0 net/netlink/ af_netlink.c:1340 netlink_sendmsg+0x86d/0xdb0 net/netlink/af_netlink.c:1929 sock_sendmsg_nosec net/socket.c:704 [en l\u00ednea] sock_sendmsg+0xcf/0x120 net/socket.c:724 ____sys_sendmsg+0x6e8/0x810 net /z\u00f3calo .c:2403 ___sys_sendmsg+0xf3/0x170 net/socket.c:2457 __sys_sendmsg+0xe5/0x1b0 net/socket.c:2486 do_syscall_x64 arch/x86/entry/common.c:50 [en l\u00ednea] arco/ x86/entrada/common.c:80"
    }
  ],
  "id": "CVE-2021-47419",
  "lastModified": "2026-08-04T10:17:02.630",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 5.9,
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary"
      },
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 5.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
      },
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 5.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 3.6,
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2021-47419",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2024-05-29T18:00:04.629892Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2024-05-21T15:15:27.350",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/3ec73ffeef54596c32aff0e73fe60971b9c8b866"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/7a1c1af341041221b3acb9d7036cc2b43e0efa75"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/a56d447f196fa9973c568f54c0d76d5391c3b0c0"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/c951c08a5996365aecbc5f1a9bddec3905e1ddfc"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/3ec73ffeef54596c32aff0e73fe60971b9c8b866"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/7a1c1af341041221b3acb9d7036cc2b43e0efa75"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/a56d447f196fa9973c568f54c0d76d5391c3b0c0"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/c951c08a5996365aecbc5f1a9bddec3905e1ddfc"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "NVD-CWE-noinfo"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}

CVE-2021-47419 (GCVE-0-2021-47419)

Vulnerability from cvelistv5 – Published: 2024-05-21 15:04 – Updated: 2026-08-05 08:47

Title

net/sched: sch_taprio: properly cancel timer from taprio_destroy()

Summary

Severity

7.8 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

5.5 (Medium)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2024-05-29 18:00 UTC

CWE

CWE-noinfo Not enough information

Assigner

Linux CNA under the mitre root

CNA scorecard D 53/100 over 6843 records in the last 180 days details

References

4 references

URL	Tags
https://git.kernel.org/stable/c/c951c08a5996365ae…
https://git.kernel.org/stable/c/3ec73ffeef54596c3…
https://git.kernel.org/stable/c/7a1c1af341041221b…
https://git.kernel.org/stable/c/a56d447f196fa9973…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: c71c512f4a65267e6a18163f4df729c489a51035 , < c951c08a5996365aecbc5f1a9bddec3905e1ddfc (git) Affected: a969a632cbe7165d448a5528806ad120c2599397 , < 3ec73ffeef54596c32aff0e73fe60971b9c8b866 (git) Affected: 44d4775ca51805b376a8db5b34f650434a08e556 , < 7a1c1af341041221b3acb9d7036cc2b43e0efa75 (git) Affected: 44d4775ca51805b376a8db5b34f650434a08e556 , < a56d447f196fa9973c568f54c0d76d5391c3b0c0 (git) Affected: 5.4.87 , < 5.4.153 (semver) Affected: 5.10.5 , < 5.10.73 (semver)
Linux	Linux	Affected: 5.11 Unaffected: 0 , < 5.11 (semver) Unaffected: 5.4.153 , ≤ 5.4.* (semver) Unaffected: 5.10.73 , ≤ 5.10.* (semver) Unaffected: 5.14.12 , ≤ 5.14.* (semver) Unaffected: 5.15 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "LOCAL",
              "availabilityImpact": "HIGH",
              "baseScore": 5.5,
              "baseSeverity": "MEDIUM",
              "confidentialityImpact": "NONE",
              "integrityImpact": "NONE",
              "privilegesRequired": "LOW",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
              "version": "3.1"
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              "content": {
                "id": "CVE-2021-47419",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2024-05-29T18:00:04.629892Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "problemTypes": [
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                "lang": "en",
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        "providerMetadata": {
          "dateUpdated": "2024-11-01T14:40:36.981Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
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        "providerMetadata": {
          "dateUpdated": "2024-08-04T05:39:59.382Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
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        "references": [
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            "url": "https://git.kernel.org/stable/c/3ec73ffeef54596c32aff0e73fe60971b9c8b866"
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            "url": "https://git.kernel.org/stable/c/7a1c1af341041221b3acb9d7036cc2b43e0efa75"
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            "url": "https://git.kernel.org/stable/c/a56d447f196fa9973c568f54c0d76d5391c3b0c0"
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        "title": "CVE Program Container"
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      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/sched/sch_taprio.c"
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              "versionType": "git"
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            {
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              "version": "0",
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              "status": "unaffected",
              "version": "5.4.153",
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              "status": "unaffected",
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            },
            {
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              "status": "unaffected",
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              "version": "5.15",
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: sch_taprio: properly cancel timer from taprio_destroy()\n\nThere is a comment in qdisc_create() about us not calling ops-\u003ereset()\nin some cases.\n\nerr_out4:\n\t/*\n\t * Any broken qdiscs that would require a ops-\u003ereset() here?\n\t * The qdisc was never in action so it shouldn\u0027t be necessary.\n\t */\n\nAs taprio sets a timer before actually receiving a packet, we need\nto cancel it from ops-\u003edestroy, just in case ops-\u003ereset has not\nbeen called.\n\nsyzbot reported:\n\nODEBUG: free active (active state 0) object type: hrtimer hint: advance_sched+0x0/0x9a0 arch/x86/include/asm/atomic64_64.h:22\nWARNING: CPU: 0 PID: 8441 at lib/debugobjects.c:505 debug_print_object+0x16e/0x250 lib/debugobjects.c:505\nModules linked in:\nCPU: 0 PID: 8441 Comm: syz-executor813 Not tainted 5.14.0-rc6-syzkaller #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011\nRIP: 0010:debug_print_object+0x16e/0x250 lib/debugobjects.c:505\nCode: ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 af 00 00 00 48 8b 14 dd e0 d3 e3 89 4c 89 ee 48 c7 c7 e0 c7 e3 89 e8 5b 86 11 05 \u003c0f\u003e 0b 83 05 85 03 92 09 01 48 83 c4 18 5b 5d 41 5c 41 5d 41 5e c3\nRSP: 0018:ffffc9000130f330 EFLAGS: 00010282\nRAX: 0000000000000000 RBX: 0000000000000003 RCX: 0000000000000000\nRDX: ffff88802baeb880 RSI: ffffffff815d87b5 RDI: fffff52000261e58\nRBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000\nR10: ffffffff815d25ee R11: 0000000000000000 R12: ffffffff898dd020\nR13: ffffffff89e3ce20 R14: ffffffff81653630 R15: dffffc0000000000\nFS:  0000000000f0d300(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000\nCS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\nCR2: 00007ffb64b3e000 CR3: 0000000036557000 CR4: 00000000001506e0\nDR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\nDR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\nCall Trace:\n __debug_check_no_obj_freed lib/debugobjects.c:987 [inline]\n debug_check_no_obj_freed+0x301/0x420 lib/debugobjects.c:1018\n slab_free_hook mm/slub.c:1603 [inline]\n slab_free_freelist_hook+0x171/0x240 mm/slub.c:1653\n slab_free mm/slub.c:3213 [inline]\n kfree+0xe4/0x540 mm/slub.c:4267\n qdisc_create+0xbcf/0x1320 net/sched/sch_api.c:1299\n tc_modify_qdisc+0x4c8/0x1a60 net/sched/sch_api.c:1663\n rtnetlink_rcv_msg+0x413/0xb80 net/core/rtnetlink.c:5571\n netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2504\n netlink_unicast_kernel net/netlink/af_netlink.c:1314 [inline]\n netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1340\n netlink_sendmsg+0x86d/0xdb0 net/netlink/af_netlink.c:1929\n sock_sendmsg_nosec net/socket.c:704 [inline]\n sock_sendmsg+0xcf/0x120 net/socket.c:724\n ____sys_sendmsg+0x6e8/0x810 net/socket.c:2403\n ___sys_sendmsg+0xf3/0x170 net/socket.c:2457\n __sys_sendmsg+0xe5/0x1b0 net/socket.c:2486\n do_syscall_x64 arch/x86/entry/common.c:50 [inline]\n do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80"
        }
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              "value": "AV:L - The bug is reached only via local rtnetlink RTM_NEWQDISC (tc_modify_qdisc \u2192 qdisc_create \u2192 taprio_init/taprio_change), not by remote packet processing.\nAC:L - An attacker fully controls qdisc creation, schedule base_time (timer expiry window), and a malformed TCA_STAB/TCA_RATE to force the err_out4 path after the timer is armed, so the UAF is reliably triggerable.\nPR:L - RTM_NEWQDISC requires CAP_NET_ADMIN checked via netlink_net_capable against the network namespace\u2019s user_ns, which an unprivileged user obtains with user namespaces (unshare -Urn) and can create multiqueue veth devices to attach taprio.\nUI:N - Exploitation needs no victim action; the attacker issues the netlink messages themselves.\nS:U - Impact is confined to the local kernel privilege boundary (standard local privilege escalation / DoS); it does not cross VM, IOMMU, or other authority boundaries.\nC:H - Freeing an active hrtimer embedded in the qdisc is a use-after-free; when the timer fires, the callback runs against attacker-controllable reallocated slab memory, enabling arbitrary kernel read primitives.\nI:H - __run_hrtimer reads timer-\u003efunction from the freed object before invoking it, so heap reuse can hijack control flow for arbitrary write / code execution, not merely a crash.\nA:H - The UAF reliably causes kernel oops/panic when the dangling advance_sched timer fires on freed memory, fully impacting availability."
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Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Vulnerability timeline

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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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