Vulnerability-Lookup

OPENSUSE-SU-2024:14234-1

Vulnerability from csaf_opensuse - Published: 2024-08-01 00:00 - Updated: 2026-09-20 21:16

Summary

klp-build-0~20240731.edfe0bf-1.1 on GA media

Severity

Moderate

Notes

Title of the patch: klp-build-0~20240731.edfe0bf-1.1 on GA media

Description of the patch: These are all security issues fixed in the klp-build-0~20240731.edfe0bf-1.1 package on the GA media of openSUSE Tumbleweed.

Patchnames: openSUSE-Tumbleweed-2024-14234

CVE-2021-47402

7 (High)


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

Affected products

Recommended 4 products

Product	Version	Remediation
Unresolved product id: openSUSE Tumbleweed:klp-build-0:0~20240731.edfe0bf-1.1.aarch64	—	Vendor Fix
Unresolved product id: openSUSE Tumbleweed:klp-build-0:0~20240731.edfe0bf-1.1.ppc64le	—	Vendor Fix
Unresolved product id: openSUSE Tumbleweed:klp-build-0:0~20240731.edfe0bf-1.1.s390x	—	Vendor Fix
Unresolved product id: openSUSE Tumbleweed:klp-build-0:0~20240731.edfe0bf-1.1.x86_64	—	Vendor Fix

Threats

Impact important

References

6 references

URL	Category
https://www.suse.com/support/security/rating/	external
https://ftp.suse.com/pub/projects/security/csaf/o…	self
https://www.suse.com/security/cve/CVE-2021-47402/	self
https://www.suse.com/security/cve/CVE-2021-47402	external
https://bugzilla.suse.com/1225301	external
https://bugzilla.suse.com/1225302	external

JSON

To clipboard

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  "vulnerabilities": [
    {
      "cve": "CVE-2021-47402",
      "ids": [
        {
          "system_name": "SUSE CVE Page",
          "text": "https://www.suse.com/security/cve/CVE-2021-47402"
        }
      ],
      "notes": [
        {
          "category": "general",
          "text": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: sched: flower: protect fl_walk() with rcu\n\nPatch that refactored fl_walk() to use idr_for_each_entry_continue_ul()\nalso removed rcu protection of individual filters which causes following\nuse-after-free when filter is deleted concurrently. Fix fl_walk() to obtain\nrcu read lock while iterating and taking the filter reference and temporary\nrelease the lock while calling arg-\u003efn() callback that can sleep.\n\nKASAN trace:\n\n[  352.773640] ==================================================================\n[  352.775041] BUG: KASAN: use-after-free in fl_walk+0x159/0x240 [cls_flower]\n[  352.776304] Read of size 4 at addr ffff8881c8251480 by task tc/2987\n\n[  352.777862] CPU: 3 PID: 2987 Comm: tc Not tainted 5.15.0-rc2+ #2\n[  352.778980] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.13.0-0-gf21b5a4aeb02-prebuilt.qemu.org 04/01/2014\n[  352.781022] Call Trace:\n[  352.781573]  dump_stack_lvl+0x46/0x5a\n[  352.782332]  print_address_description.constprop.0+0x1f/0x140\n[  352.783400]  ? fl_walk+0x159/0x240 [cls_flower]\n[  352.784292]  ? fl_walk+0x159/0x240 [cls_flower]\n[  352.785138]  kasan_report.cold+0x83/0xdf\n[  352.785851]  ? fl_walk+0x159/0x240 [cls_flower]\n[  352.786587]  kasan_check_range+0x145/0x1a0\n[  352.787337]  fl_walk+0x159/0x240 [cls_flower]\n[  352.788163]  ? fl_put+0x10/0x10 [cls_flower]\n[  352.789007]  ? __mutex_unlock_slowpath.constprop.0+0x220/0x220\n[  352.790102]  tcf_chain_dump+0x231/0x450\n[  352.790878]  ? tcf_chain_tp_delete_empty+0x170/0x170\n[  352.791833]  ? __might_sleep+0x2e/0xc0\n[  352.792594]  ? tfilter_notify+0x170/0x170\n[  352.793400]  ? __mutex_unlock_slowpath.constprop.0+0x220/0x220\n[  352.794477]  tc_dump_tfilter+0x385/0x4b0\n[  352.795262]  ? tc_new_tfilter+0x1180/0x1180\n[  352.796103]  ? __mod_node_page_state+0x1f/0xc0\n[  352.796974]  ? __build_skb_around+0x10e/0x130\n[  352.797826]  netlink_dump+0x2c0/0x560\n[  352.798563]  ? netlink_getsockopt+0x430/0x430\n[  352.799433]  ? __mutex_unlock_slowpath.constprop.0+0x220/0x220\n[  352.800542]  __netlink_dump_start+0x356/0x440\n[  352.801397]  rtnetlink_rcv_msg+0x3ff/0x550\n[  352.802190]  ? tc_new_tfilter+0x1180/0x1180\n[  352.802872]  ? rtnl_calcit.isra.0+0x1f0/0x1f0\n[  352.803668]  ? tc_new_tfilter+0x1180/0x1180\n[  352.804344]  ? _copy_from_iter_nocache+0x800/0x800\n[  352.805202]  ? kasan_set_track+0x1c/0x30\n[  352.805900]  netlink_rcv_skb+0xc6/0x1f0\n[  352.806587]  ? rht_deferred_worker+0x6b0/0x6b0\n[  352.807455]  ? rtnl_calcit.isra.0+0x1f0/0x1f0\n[  352.808324]  ? netlink_ack+0x4d0/0x4d0\n[  352.809086]  ? netlink_deliver_tap+0x62/0x3d0\n[  352.809951]  netlink_unicast+0x353/0x480\n[  352.810744]  ? netlink_attachskb+0x430/0x430\n[  352.811586]  ? __alloc_skb+0xd7/0x200\n[  352.812349]  netlink_sendmsg+0x396/0x680\n[  352.813132]  ? netlink_unicast+0x480/0x480\n[  352.813952]  ? __import_iovec+0x192/0x210\n[  352.814759]  ? netlink_unicast+0x480/0x480\n[  352.815580]  sock_sendmsg+0x6c/0x80\n[  352.816299]  ____sys_sendmsg+0x3a5/0x3c0\n[  352.817096]  ? kernel_sendmsg+0x30/0x30\n[  352.817873]  ? __ia32_sys_recvmmsg+0x150/0x150\n[  352.818753]  ___sys_sendmsg+0xd8/0x140\n[  352.819518]  ? sendmsg_copy_msghdr+0x110/0x110\n[  352.820402]  ? ___sys_recvmsg+0xf4/0x1a0\n[  352.821110]  ? __copy_msghdr_from_user+0x260/0x260\n[  352.821934]  ? _raw_spin_lock+0x81/0xd0\n[  352.822680]  ? __handle_mm_fault+0xef3/0x1b20\n[  352.823549]  ? rb_insert_color+0x2a/0x270\n[  352.824373]  ? copy_page_range+0x16b0/0x16b0\n[  352.825209]  ? perf_event_update_userpage+0x2d0/0x2d0\n[  352.826190]  ? __fget_light+0xd9/0xf0\n[  352.826941]  __sys_sendmsg+0xb3/0x130\n[  352.827613]  ? __sys_sendmsg_sock+0x20/0x20\n[  352.828377]  ? do_user_addr_fault+0x2c5/0x8a0\n[  352.829184]  ? fpregs_assert_state_consistent+0x52/0x60\n[  352.830001]  ? exit_to_user_mode_prepare+0x32/0x160\n[  352.830845]  do_syscall_64+0x35/0x80\n[  352.831445]  entry_SYSCALL_64_after_hwframe+0x44/0xae\n[  352.832331] RIP: 0033:0x7f7bee973c17\n[ \n---truncated---",
          "title": "CVE description"
        }
      ],
      "product_status": {
        "recommended": [
          "openSUSE Tumbleweed:klp-build-0:0~20240731.edfe0bf-1.1.aarch64",
          "openSUSE Tumbleweed:klp-build-0:0~20240731.edfe0bf-1.1.ppc64le",
          "openSUSE Tumbleweed:klp-build-0:0~20240731.edfe0bf-1.1.s390x",
          "openSUSE Tumbleweed:klp-build-0:0~20240731.edfe0bf-1.1.x86_64"
        ]
      },
      "references": [
        {
          "category": "external",
          "summary": "CVE-2021-47402",
          "url": "https://www.suse.com/security/cve/CVE-2021-47402"
        },
        {
          "category": "external",
          "summary": "SUSE Bug 1225301 for CVE-2021-47402",
          "url": "https://bugzilla.suse.com/1225301"
        },
        {
          "category": "external",
          "summary": "SUSE Bug 1225302 for CVE-2021-47402",
          "url": "https://bugzilla.suse.com/1225302"
        }
      ],
      "remediations": [
        {
          "category": "vendor_fix",
          "details": "To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or \"zypper patch\".\n",
          "product_ids": [
            "openSUSE Tumbleweed:klp-build-0:0~20240731.edfe0bf-1.1.aarch64",
            "openSUSE Tumbleweed:klp-build-0:0~20240731.edfe0bf-1.1.ppc64le",
            "openSUSE Tumbleweed:klp-build-0:0~20240731.edfe0bf-1.1.s390x",
            "openSUSE Tumbleweed:klp-build-0:0~20240731.edfe0bf-1.1.x86_64"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 7,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "products": [
            "openSUSE Tumbleweed:klp-build-0:0~20240731.edfe0bf-1.1.aarch64",
            "openSUSE Tumbleweed:klp-build-0:0~20240731.edfe0bf-1.1.ppc64le",
            "openSUSE Tumbleweed:klp-build-0:0~20240731.edfe0bf-1.1.s390x",
            "openSUSE Tumbleweed:klp-build-0:0~20240731.edfe0bf-1.1.x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "date": "2024-08-01T00:00:00Z",
          "details": "important"
        }
      ],
      "title": "CVE-2021-47402"
    }
  ]
}

CVE-2021-47402 (GCVE-0-2021-47402)

Vulnerability from cvelistv5 – Published: 2024-05-21 15:03 – Updated: 2026-08-05 08:47

Title

net: sched: flower: protect fl_walk() with rcu

Summary

In the Linux kernel, the following vulnerability has been resolved: net: sched: flower: protect fl_walk() with rcu Patch that refactored fl_walk() to use idr_for_each_entry_continue_ul() also removed rcu protection of individual filters which causes following use-after-free when filter is deleted concurrently. Fix fl_walk() to obtain rcu read lock while iterating and taking the filter reference and temporary release the lock while calling arg->fn() callback that can sleep. KASAN trace: [ 352.773640] ================================================================== [ 352.775041] BUG: KASAN: use-after-free in fl_walk+0x159/0x240 [cls_flower] [ 352.776304] Read of size 4 at addr ffff8881c8251480 by task tc/2987 [ 352.777862] CPU: 3 PID: 2987 Comm: tc Not tainted 5.15.0-rc2+ #2 [ 352.778980] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.13.0-0-gf21b5a4aeb02-prebuilt.qemu.org 04/01/2014 [ 352.781022] Call Trace: [ 352.781573] dump_stack_lvl+0x46/0x5a [ 352.782332] print_address_description.constprop.0+0x1f/0x140 [ 352.783400] ? fl_walk+0x159/0x240 [cls_flower] [ 352.784292] ? fl_walk+0x159/0x240 [cls_flower] [ 352.785138] kasan_report.cold+0x83/0xdf [ 352.785851] ? fl_walk+0x159/0x240 [cls_flower] [ 352.786587] kasan_check_range+0x145/0x1a0 [ 352.787337] fl_walk+0x159/0x240 [cls_flower] [ 352.788163] ? fl_put+0x10/0x10 [cls_flower] [ 352.789007] ? __mutex_unlock_slowpath.constprop.0+0x220/0x220 [ 352.790102] tcf_chain_dump+0x231/0x450 [ 352.790878] ? tcf_chain_tp_delete_empty+0x170/0x170 [ 352.791833] ? __might_sleep+0x2e/0xc0 [ 352.792594] ? tfilter_notify+0x170/0x170 [ 352.793400] ? __mutex_unlock_slowpath.constprop.0+0x220/0x220 [ 352.794477] tc_dump_tfilter+0x385/0x4b0 [ 352.795262] ? tc_new_tfilter+0x1180/0x1180 [ 352.796103] ? __mod_node_page_state+0x1f/0xc0 [ 352.796974] ? __build_skb_around+0x10e/0x130 [ 352.797826] netlink_dump+0x2c0/0x560 [ 352.798563] ? netlink_getsockopt+0x430/0x430 [ 352.799433] ? __mutex_unlock_slowpath.constprop.0+0x220/0x220 [ 352.800542] __netlink_dump_start+0x356/0x440 [ 352.801397] rtnetlink_rcv_msg+0x3ff/0x550 [ 352.802190] ? tc_new_tfilter+0x1180/0x1180 [ 352.802872] ? rtnl_calcit.isra.0+0x1f0/0x1f0 [ 352.803668] ? tc_new_tfilter+0x1180/0x1180 [ 352.804344] ? _copy_from_iter_nocache+0x800/0x800 [ 352.805202] ? kasan_set_track+0x1c/0x30 [ 352.805900] netlink_rcv_skb+0xc6/0x1f0 [ 352.806587] ? rht_deferred_worker+0x6b0/0x6b0 [ 352.807455] ? rtnl_calcit.isra.0+0x1f0/0x1f0 [ 352.808324] ? netlink_ack+0x4d0/0x4d0 [ 352.809086] ? netlink_deliver_tap+0x62/0x3d0 [ 352.809951] netlink_unicast+0x353/0x480 [ 352.810744] ? netlink_attachskb+0x430/0x430 [ 352.811586] ? __alloc_skb+0xd7/0x200 [ 352.812349] netlink_sendmsg+0x396/0x680 [ 352.813132] ? netlink_unicast+0x480/0x480 [ 352.813952] ? __import_iovec+0x192/0x210 [ 352.814759] ? netlink_unicast+0x480/0x480 [ 352.815580] sock_sendmsg+0x6c/0x80 [ 352.816299] ____sys_sendmsg+0x3a5/0x3c0 [ 352.817096] ? kernel_sendmsg+0x30/0x30 [ 352.817873] ? __ia32_sys_recvmmsg+0x150/0x150 [ 352.818753] ___sys_sendmsg+0xd8/0x140 [ 352.819518] ? sendmsg_copy_msghdr+0x110/0x110 [ 352.820402] ? ___sys_recvmsg+0xf4/0x1a0 [ 352.821110] ? __copy_msghdr_from_user+0x260/0x260 [ 352.821934] ? _raw_spin_lock+0x81/0xd0 [ 352.822680] ? __handle_mm_fault+0xef3/0x1b20 [ 352.823549] ? rb_insert_color+0x2a/0x270 [ 352.824373] ? copy_page_range+0x16b0/0x16b0 [ 352.825209] ? perf_event_update_userpage+0x2d0/0x2d0 [ 352.826190] ? __fget_light+0xd9/0xf0 [ 352.826941] __sys_sendmsg+0xb3/0x130 [ 352.827613] ? __sys_sendmsg_sock+0x20/0x20 [ 352.828377] ? do_user_addr_fault+0x2c5/0x8a0 [ 352.829184] ? fpregs_assert_state_consistent+0x52/0x60 [ 352.830001] ? exit_to_user_mode_prepare+0x32/0x160 [ 352.830845] do_syscall_64+0x35/0x80 [ 352.831445] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 352.832331] RIP: 0033:0x7f7bee973c17 [ ---truncated---

Severity

7.8 (High)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2024-09-10 15:38 UTC

Assigner

Linux CNA under the mitre root

CNA scorecard D 54/100 over 6618 records in the last 180 days details

References

4 references

URL	Tags
https://git.kernel.org/stable/c/694b0cee7f8546b69…
https://git.kernel.org/stable/c/d0d520c19e7ea19ed…
https://git.kernel.org/stable/c/dab4677bdbffa5c82…
https://git.kernel.org/stable/c/d5ef190693a7d76c5…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: d39d714969cda5cbda291402c8c6b1fb1047f42e , < 694b0cee7f8546b69a80996a29cb3cf4149c0453 (git) Affected: d39d714969cda5cbda291402c8c6b1fb1047f42e , < d0d520c19e7ea19ed38dc5797b12397b6ccf9f88 (git) Affected: d39d714969cda5cbda291402c8c6b1fb1047f42e , < dab4677bdbffa5c8270e79e34e51c89efa0728a0 (git) Affected: d39d714969cda5cbda291402c8c6b1fb1047f42e , < d5ef190693a7d76c5c192d108e8dec48307b46ee (git)
Linux	Linux	Affected: 5.3 Unaffected: 0 , < 5.3 (semver) Unaffected: 5.4.151 , ≤ 5.4.* (semver) Unaffected: 5.10.71 , ≤ 5.10.* (semver) Unaffected: 5.14.10 , ≤ 5.14.* (semver) Unaffected: 5.15 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "adp": [
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        "providerMetadata": {
          "dateUpdated": "2024-08-04T05:39:58.958Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
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            "url": "https://git.kernel.org/stable/c/694b0cee7f8546b69a80996a29cb3cf4149c0453"
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            "url": "https://git.kernel.org/stable/c/dab4677bdbffa5c8270e79e34e51c89efa0728a0"
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        "metrics": [
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              "content": {
                "id": "CVE-2021-47402",
                "options": [
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                    "Automatable": "no"
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                "role": "CISA Coordinator",
                "timestamp": "2024-09-10T15:38:07.154281Z",
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        },
        "title": "CISA ADP Vulnrichment"
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    "cna": {
      "affected": [
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          "product": "Linux",
          "programFiles": [
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          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "status": "affected",
              "version": "d39d714969cda5cbda291402c8c6b1fb1047f42e",
              "versionType": "git"
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              "version": "d39d714969cda5cbda291402c8c6b1fb1047f42e",
              "versionType": "git"
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          "programFiles": [
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          "vendor": "Linux",
          "versions": [
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              "version": "5.3"
            },
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.4.*",
              "status": "unaffected",
              "version": "5.4.151",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.71",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.14.*",
              "status": "unaffected",
              "version": "5.14.10",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "5.15",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.4.151",
                  "versionStartIncluding": "5.3",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.71",
                  "versionStartIncluding": "5.3",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.14.10",
                  "versionStartIncluding": "5.3",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15",
                  "versionStartIncluding": "5.3",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: sched: flower: protect fl_walk() with rcu\n\nPatch that refactored fl_walk() to use idr_for_each_entry_continue_ul()\nalso removed rcu protection of individual filters which causes following\nuse-after-free when filter is deleted concurrently. Fix fl_walk() to obtain\nrcu read lock while iterating and taking the filter reference and temporary\nrelease the lock while calling arg-\u003efn() callback that can sleep.\n\nKASAN trace:\n\n[  352.773640] ==================================================================\n[  352.775041] BUG: KASAN: use-after-free in fl_walk+0x159/0x240 [cls_flower]\n[  352.776304] Read of size 4 at addr ffff8881c8251480 by task tc/2987\n\n[  352.777862] CPU: 3 PID: 2987 Comm: tc Not tainted 5.15.0-rc2+ #2\n[  352.778980] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.13.0-0-gf21b5a4aeb02-prebuilt.qemu.org 04/01/2014\n[  352.781022] Call Trace:\n[  352.781573]  dump_stack_lvl+0x46/0x5a\n[  352.782332]  print_address_description.constprop.0+0x1f/0x140\n[  352.783400]  ? fl_walk+0x159/0x240 [cls_flower]\n[  352.784292]  ? fl_walk+0x159/0x240 [cls_flower]\n[  352.785138]  kasan_report.cold+0x83/0xdf\n[  352.785851]  ? fl_walk+0x159/0x240 [cls_flower]\n[  352.786587]  kasan_check_range+0x145/0x1a0\n[  352.787337]  fl_walk+0x159/0x240 [cls_flower]\n[  352.788163]  ? fl_put+0x10/0x10 [cls_flower]\n[  352.789007]  ? __mutex_unlock_slowpath.constprop.0+0x220/0x220\n[  352.790102]  tcf_chain_dump+0x231/0x450\n[  352.790878]  ? tcf_chain_tp_delete_empty+0x170/0x170\n[  352.791833]  ? __might_sleep+0x2e/0xc0\n[  352.792594]  ? tfilter_notify+0x170/0x170\n[  352.793400]  ? __mutex_unlock_slowpath.constprop.0+0x220/0x220\n[  352.794477]  tc_dump_tfilter+0x385/0x4b0\n[  352.795262]  ? tc_new_tfilter+0x1180/0x1180\n[  352.796103]  ? __mod_node_page_state+0x1f/0xc0\n[  352.796974]  ? __build_skb_around+0x10e/0x130\n[  352.797826]  netlink_dump+0x2c0/0x560\n[  352.798563]  ? netlink_getsockopt+0x430/0x430\n[  352.799433]  ? __mutex_unlock_slowpath.constprop.0+0x220/0x220\n[  352.800542]  __netlink_dump_start+0x356/0x440\n[  352.801397]  rtnetlink_rcv_msg+0x3ff/0x550\n[  352.802190]  ? tc_new_tfilter+0x1180/0x1180\n[  352.802872]  ? rtnl_calcit.isra.0+0x1f0/0x1f0\n[  352.803668]  ? tc_new_tfilter+0x1180/0x1180\n[  352.804344]  ? _copy_from_iter_nocache+0x800/0x800\n[  352.805202]  ? kasan_set_track+0x1c/0x30\n[  352.805900]  netlink_rcv_skb+0xc6/0x1f0\n[  352.806587]  ? rht_deferred_worker+0x6b0/0x6b0\n[  352.807455]  ? rtnl_calcit.isra.0+0x1f0/0x1f0\n[  352.808324]  ? netlink_ack+0x4d0/0x4d0\n[  352.809086]  ? netlink_deliver_tap+0x62/0x3d0\n[  352.809951]  netlink_unicast+0x353/0x480\n[  352.810744]  ? netlink_attachskb+0x430/0x430\n[  352.811586]  ? __alloc_skb+0xd7/0x200\n[  352.812349]  netlink_sendmsg+0x396/0x680\n[  352.813132]  ? netlink_unicast+0x480/0x480\n[  352.813952]  ? __import_iovec+0x192/0x210\n[  352.814759]  ? netlink_unicast+0x480/0x480\n[  352.815580]  sock_sendmsg+0x6c/0x80\n[  352.816299]  ____sys_sendmsg+0x3a5/0x3c0\n[  352.817096]  ? kernel_sendmsg+0x30/0x30\n[  352.817873]  ? __ia32_sys_recvmmsg+0x150/0x150\n[  352.818753]  ___sys_sendmsg+0xd8/0x140\n[  352.819518]  ? sendmsg_copy_msghdr+0x110/0x110\n[  352.820402]  ? ___sys_recvmsg+0xf4/0x1a0\n[  352.821110]  ? __copy_msghdr_from_user+0x260/0x260\n[  352.821934]  ? _raw_spin_lock+0x81/0xd0\n[  352.822680]  ? __handle_mm_fault+0xef3/0x1b20\n[  352.823549]  ? rb_insert_color+0x2a/0x270\n[  352.824373]  ? copy_page_range+0x16b0/0x16b0\n[  352.825209]  ? perf_event_update_userpage+0x2d0/0x2d0\n[  352.826190]  ? __fget_light+0xd9/0xf0\n[  352.826941]  __sys_sendmsg+0xb3/0x130\n[  352.827613]  ? __sys_sendmsg_sock+0x20/0x20\n[  352.828377]  ? do_user_addr_fault+0x2c5/0x8a0\n[  352.829184]  ? fpregs_assert_state_consistent+0x52/0x60\n[  352.830001]  ? exit_to_user_mode_prepare+0x32/0x160\n[  352.830845]  do_syscall_64+0x35/0x80\n[  352.831445]  entry_SYSCALL_64_after_hwframe+0x44/0xae\n[  352.832331] RIP: 0033:0x7f7bee973c17\n[ \n---truncated---"
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The bug is triggered through local rtnetlink/tc syscalls (sendmsg \u2192 rtnetlink_rcv_msg \u2192 tc_dump_tfilter/tc_del_tfilter \u2192 fl_walk), not via remotely processed packets.\nAC:L - The attacker controls both sides of the race by concurrently dumping and deleting flower filters they created; flower is TCF_PROTO_OPS_DOIT_UNLOCKED so dump and delete can run without full rtnl serialization.\nPR:L - Creating/deleting filters requires CAP_NET_ADMIN via netlink_net_capable, which an unprivileged user obtains in a user+net namespace (unshare -Urn); tc/qdisc in userns is PR:L per guidance.\nUI:N - Exploitation requires only the attacker\u2019s own netlink operations; no victim action is needed.\nS:U - Impact is confined to the local kernel privilege boundary (standard local privilege escalation/DoS); it does not cross VM, IOMMU, or other security authorities.\nC:H - This is a use-after-free of a kmalloc-2k cls_fl_filter; UAF enables reclaim/spray of the freed object and arbitrary read primitives, including via the dump callback path.\nI:H - UAF of the filter object enables heap spraying and write/control-flow hijacking primitives once the freed slot is reclaimed with attacker-controlled data.\nA:H - The UAF produces a kernel oops/KASAN use-after-free (confirmed in the fix commit trace) and can crash or hang the system even without full exploitation."
            }
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      "providerMetadata": {
        "dateUpdated": "2026-08-05T08:47:42.173Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/694b0cee7f8546b69a80996a29cb3cf4149c0453"
        },
        {
          "url": "https://git.kernel.org/stable/c/d0d520c19e7ea19ed38dc5797b12397b6ccf9f88"
        },
        {
          "url": "https://git.kernel.org/stable/c/dab4677bdbffa5c8270e79e34e51c89efa0728a0"
        },
        {
          "url": "https://git.kernel.org/stable/c/d5ef190693a7d76c5c192d108e8dec48307b46ee"
        }
      ],
      "title": "net: sched: flower: protect fl_walk() with rcu",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2021-47402",
    "datePublished": "2024-05-21T15:03:56.690Z",
    "dateReserved": "2024-05-21T14:58:30.816Z",
    "dateUpdated": "2026-08-05T08:47:42.173Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

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.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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OPENSUSE-SU-2024:14234-1

CVE-2021-47402 (GCVE-0-2021-47402)

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