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

Vulnerability from cvelistv5 – Published: 2024-05-21 15:04 – Updated: 2025-05-04 07:10
VLAI?
Title
net/sched: sch_taprio: properly cancel timer from taprio_destroy()
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
Severity ?
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: c71c512f4a65267e6a18163f4df729c489a51035 , < c951c08a5996365aecbc5f1a9bddec3905e1ddfc (git)
Affected: a969a632cbe7165d448a5528806ad120c2599397 , < 3ec73ffeef54596c32aff0e73fe60971b9c8b866 (git)
Affected: 44d4775ca51805b376a8db5b34f650434a08e556 , < 7a1c1af341041221b3acb9d7036cc2b43e0efa75 (git)
Affected: 44d4775ca51805b376a8db5b34f650434a08e556 , < a56d447f196fa9973c568f54c0d76d5391c3b0c0 (git)
Create a notification for this product.
    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)
Create a notification for this product.
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\"https://git.kernel.org/stable/c/a56d447f196fa9973c568f54c0d76d5391c3b0c0\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"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\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.153\", \"versionStartIncluding\": \"5.4.87\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.73\", \"versionStartIncluding\": \"5.10.5\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.14.12\", \"versionStartIncluding\": \"5.11\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15\", \"versionStartIncluding\": \"5.11\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-05-04T07:10:31.581Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2021-47419\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-05-04T07:10:31.581Z\", \"dateReserved\": \"2024-05-21T14:58:30.818Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-05-21T15:04:07.992Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


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Sightings

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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.



Detection rules are retrieved from Rulezet.