CVE-2021-47299 (GCVE-0-2021-47299)
Vulnerability from cvelistv5 – Published: 2024-05-21 14:35 – Updated: 2026-05-11 13:51
VLAI
EPSS
VEX
Title
xdp, net: Fix use-after-free in bpf_xdp_link_release
Summary
In the Linux kernel, the following vulnerability has been resolved:
xdp, net: Fix use-after-free in bpf_xdp_link_release
The problem occurs between dev_get_by_index() and dev_xdp_attach_link().
At this point, dev_xdp_uninstall() is called. Then xdp link will not be
detached automatically when dev is released. But link->dev already
points to dev, when xdp link is released, dev will still be accessed,
but dev has been released.
dev_get_by_index() |
link->dev = dev |
| rtnl_lock()
| unregister_netdevice_many()
| dev_xdp_uninstall()
| rtnl_unlock()
rtnl_lock(); |
dev_xdp_attach_link() |
rtnl_unlock(); |
| netdev_run_todo() // dev released
bpf_xdp_link_release() |
/* access dev. |
use-after-free */ |
[ 45.966867] BUG: KASAN: use-after-free in bpf_xdp_link_release+0x3b8/0x3d0
[ 45.967619] Read of size 8 at addr ffff00000f9980c8 by task a.out/732
[ 45.968297]
[ 45.968502] CPU: 1 PID: 732 Comm: a.out Not tainted 5.13.0+ #22
[ 45.969222] Hardware name: linux,dummy-virt (DT)
[ 45.969795] Call trace:
[ 45.970106] dump_backtrace+0x0/0x4c8
[ 45.970564] show_stack+0x30/0x40
[ 45.970981] dump_stack_lvl+0x120/0x18c
[ 45.971470] print_address_description.constprop.0+0x74/0x30c
[ 45.972182] kasan_report+0x1e8/0x200
[ 45.972659] __asan_report_load8_noabort+0x2c/0x50
[ 45.973273] bpf_xdp_link_release+0x3b8/0x3d0
[ 45.973834] bpf_link_free+0xd0/0x188
[ 45.974315] bpf_link_put+0x1d0/0x218
[ 45.974790] bpf_link_release+0x3c/0x58
[ 45.975291] __fput+0x20c/0x7e8
[ 45.975706] ____fput+0x24/0x30
[ 45.976117] task_work_run+0x104/0x258
[ 45.976609] do_notify_resume+0x894/0xaf8
[ 45.977121] work_pending+0xc/0x328
[ 45.977575]
[ 45.977775] The buggy address belongs to the page:
[ 45.978369] page:fffffc00003e6600 refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x4f998
[ 45.979522] flags: 0x7fffe0000000000(node=0|zone=0|lastcpupid=0x3ffff)
[ 45.980349] raw: 07fffe0000000000 fffffc00003e6708 ffff0000dac3c010 0000000000000000
[ 45.981309] raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
[ 45.982259] page dumped because: kasan: bad access detected
[ 45.982948]
[ 45.983153] Memory state around the buggy address:
[ 45.983753] ffff00000f997f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[ 45.984645] ffff00000f998000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[ 45.985533] >ffff00000f998080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[ 45.986419] ^
[ 45.987112] ffff00000f998100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[ 45.988006] ffff00000f998180: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[ 45.988895] ==================================================================
[ 45.989773] Disabling lock debugging due to kernel taint
[ 45.990552] Kernel panic - not syncing: panic_on_warn set ...
[ 45.991166] CPU: 1 PID: 732 Comm: a.out Tainted: G B 5.13.0+ #22
[ 45.991929] Hardware name: linux,dummy-virt (DT)
[ 45.992448] Call trace:
[ 45.992753] dump_backtrace+0x0/0x4c8
[ 45.993208] show_stack+0x30/0x40
[ 45.993627] dump_stack_lvl+0x120/0x18c
[ 45.994113] dump_stack+0x1c/0x34
[ 45.994530] panic+0x3a4/0x7d8
[ 45.994930] end_report+0x194/0x198
[ 45.995380] kasan_report+0x134/0x200
[ 45.995850] __asan_report_load8_noabort+0x2c/0x50
[ 45.996453] bpf_xdp_link_release+0x3b8/0x3d0
[ 45.997007] bpf_link_free+0xd0/0x188
[ 45.997474] bpf_link_put+0x1d0/0x218
[ 45.997942] bpf_link_release+0x3c/0x58
[ 45.998429] __fput+0x20c/0x7e8
[ 45.998833] ____fput+0x24/0x30
[ 45.999247] task_work_run+0x104/0x258
[ 45.999731] do_notify_resume+0x894/0xaf8
[ 46.000236] work_pending
---truncated---
Severity
No CVSS data available.
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-09-10 15:39 UTC
Assigner
References
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
aa8d3a716b59db6c1ad6c68fb8aa05e31980da60 , < ca9ba1de8f09976b45ccc8e655c51c6201992139
(git)
Affected: aa8d3a716b59db6c1ad6c68fb8aa05e31980da60 , < a7537dc73e69ad9c0b67ad24ad3ebee954ed0af6 (git) Affected: aa8d3a716b59db6c1ad6c68fb8aa05e31980da60 , < 5acc7d3e8d342858405fbbc671221f676b547ce7 (git) |
guessed | |
| Linux | Linux |
Affected:
5.9
Unaffected: 0 , < 5.9 (semver) Unaffected: 5.10.54 , ≤ 5.10.* (semver) Unaffected: 5.13.6 , ≤ 5.13.* (semver) Unaffected: 5.14 , ≤ * (original_commit_for_fix) |
guessed |
{
"containers": {
"adp": [
{
"providerMetadata": {
"dateUpdated": "2024-08-04T05:32:08.438Z",
"orgId": "af854a3a-2127-422b-91ae-364da2661108",
"shortName": "CVE"
},
"references": [
{
"tags": [
"x_transferred"
],
"url": "https://git.kernel.org/stable/c/ca9ba1de8f09976b45ccc8e655c51c6201992139"
},
{
"tags": [
"x_transferred"
],
"url": "https://git.kernel.org/stable/c/a7537dc73e69ad9c0b67ad24ad3ebee954ed0af6"
},
{
"tags": [
"x_transferred"
],
"url": "https://git.kernel.org/stable/c/5acc7d3e8d342858405fbbc671221f676b547ce7"
}
],
"title": "CVE Program Container"
},
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2021-47299",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2024-09-10T15:39:22.390022Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2024-09-11T17:33:55.680Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"net/core/dev.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "ca9ba1de8f09976b45ccc8e655c51c6201992139",
"status": "affected",
"version": "aa8d3a716b59db6c1ad6c68fb8aa05e31980da60",
"versionType": "git"
},
{
"lessThan": "a7537dc73e69ad9c0b67ad24ad3ebee954ed0af6",
"status": "affected",
"version": "aa8d3a716b59db6c1ad6c68fb8aa05e31980da60",
"versionType": "git"
},
{
"lessThan": "5acc7d3e8d342858405fbbc671221f676b547ce7",
"status": "affected",
"version": "aa8d3a716b59db6c1ad6c68fb8aa05e31980da60",
"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"net/core/dev.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "5.9"
},
{
"lessThan": "5.9",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"version": "5.10.54",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.13.*",
"status": "unaffected",
"version": "5.13.6",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "5.14",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.10.54",
"versionStartIncluding": "5.9",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.13.6",
"versionStartIncluding": "5.9",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.14",
"versionStartIncluding": "5.9",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nxdp, net: Fix use-after-free in bpf_xdp_link_release\n\nThe problem occurs between dev_get_by_index() and dev_xdp_attach_link().\nAt this point, dev_xdp_uninstall() is called. Then xdp link will not be\ndetached automatically when dev is released. But link-\u003edev already\npoints to dev, when xdp link is released, dev will still be accessed,\nbut dev has been released.\n\ndev_get_by_index() |\nlink-\u003edev = dev |\n | rtnl_lock()\n | unregister_netdevice_many()\n | dev_xdp_uninstall()\n | rtnl_unlock()\nrtnl_lock(); |\ndev_xdp_attach_link() |\nrtnl_unlock(); |\n | netdev_run_todo() // dev released\nbpf_xdp_link_release() |\n /* access dev. |\n use-after-free */ |\n\n[ 45.966867] BUG: KASAN: use-after-free in bpf_xdp_link_release+0x3b8/0x3d0\n[ 45.967619] Read of size 8 at addr ffff00000f9980c8 by task a.out/732\n[ 45.968297]\n[ 45.968502] CPU: 1 PID: 732 Comm: a.out Not tainted 5.13.0+ #22\n[ 45.969222] Hardware name: linux,dummy-virt (DT)\n[ 45.969795] Call trace:\n[ 45.970106] dump_backtrace+0x0/0x4c8\n[ 45.970564] show_stack+0x30/0x40\n[ 45.970981] dump_stack_lvl+0x120/0x18c\n[ 45.971470] print_address_description.constprop.0+0x74/0x30c\n[ 45.972182] kasan_report+0x1e8/0x200\n[ 45.972659] __asan_report_load8_noabort+0x2c/0x50\n[ 45.973273] bpf_xdp_link_release+0x3b8/0x3d0\n[ 45.973834] bpf_link_free+0xd0/0x188\n[ 45.974315] bpf_link_put+0x1d0/0x218\n[ 45.974790] bpf_link_release+0x3c/0x58\n[ 45.975291] __fput+0x20c/0x7e8\n[ 45.975706] ____fput+0x24/0x30\n[ 45.976117] task_work_run+0x104/0x258\n[ 45.976609] do_notify_resume+0x894/0xaf8\n[ 45.977121] work_pending+0xc/0x328\n[ 45.977575]\n[ 45.977775] The buggy address belongs to the page:\n[ 45.978369] page:fffffc00003e6600 refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x4f998\n[ 45.979522] flags: 0x7fffe0000000000(node=0|zone=0|lastcpupid=0x3ffff)\n[ 45.980349] raw: 07fffe0000000000 fffffc00003e6708 ffff0000dac3c010 0000000000000000\n[ 45.981309] raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000\n[ 45.982259] page dumped because: kasan: bad access detected\n[ 45.982948]\n[ 45.983153] Memory state around the buggy address:\n[ 45.983753] ffff00000f997f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc\n[ 45.984645] ffff00000f998000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff\n[ 45.985533] \u003effff00000f998080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff\n[ 45.986419] ^\n[ 45.987112] ffff00000f998100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff\n[ 45.988006] ffff00000f998180: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff\n[ 45.988895] ==================================================================\n[ 45.989773] Disabling lock debugging due to kernel taint\n[ 45.990552] Kernel panic - not syncing: panic_on_warn set ...\n[ 45.991166] CPU: 1 PID: 732 Comm: a.out Tainted: G B 5.13.0+ #22\n[ 45.991929] Hardware name: linux,dummy-virt (DT)\n[ 45.992448] Call trace:\n[ 45.992753] dump_backtrace+0x0/0x4c8\n[ 45.993208] show_stack+0x30/0x40\n[ 45.993627] dump_stack_lvl+0x120/0x18c\n[ 45.994113] dump_stack+0x1c/0x34\n[ 45.994530] panic+0x3a4/0x7d8\n[ 45.994930] end_report+0x194/0x198\n[ 45.995380] kasan_report+0x134/0x200\n[ 45.995850] __asan_report_load8_noabort+0x2c/0x50\n[ 45.996453] bpf_xdp_link_release+0x3b8/0x3d0\n[ 45.997007] bpf_link_free+0xd0/0x188\n[ 45.997474] bpf_link_put+0x1d0/0x218\n[ 45.997942] bpf_link_release+0x3c/0x58\n[ 45.998429] __fput+0x20c/0x7e8\n[ 45.998833] ____fput+0x24/0x30\n[ 45.999247] task_work_run+0x104/0x258\n[ 45.999731] do_notify_resume+0x894/0xaf8\n[ 46.000236] work_pending\n---truncated---"
}
],
"providerMetadata": {
"dateUpdated": "2026-05-11T13:51:48.198Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/ca9ba1de8f09976b45ccc8e655c51c6201992139"
},
{
"url": "https://git.kernel.org/stable/c/a7537dc73e69ad9c0b67ad24ad3ebee954ed0af6"
},
{
"url": "https://git.kernel.org/stable/c/5acc7d3e8d342858405fbbc671221f676b547ce7"
}
],
"title": "xdp, net: Fix use-after-free in bpf_xdp_link_release",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2021-47299",
"datePublished": "2024-05-21T14:35:21.276Z",
"dateReserved": "2024-05-21T13:27:52.132Z",
"dateUpdated": "2026-05-11T13:51:48.198Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"epss": {
"cve": "CVE-2021-47299",
"date": "2026-10-18",
"epss": "0.00226",
"percentile": "0.12318"
},
"nvd": {
"cve": {
"affected": [
{
"affectedData": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"net/core/dev.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "ca9ba1de8f09976b45ccc8e655c51c6201992139",
"status": "affected",
"version": "aa8d3a716b59db6c1ad6c68fb8aa05e31980da60",
"versionType": "git"
},
{
"lessThan": "a7537dc73e69ad9c0b67ad24ad3ebee954ed0af6",
"status": "affected",
"version": "aa8d3a716b59db6c1ad6c68fb8aa05e31980da60",
"versionType": "git"
},
{
"lessThan": "5acc7d3e8d342858405fbbc671221f676b547ce7",
"status": "affected",
"version": "aa8d3a716b59db6c1ad6c68fb8aa05e31980da60",
"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"net/core/dev.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "5.9"
},
{
"lessThan": "5.9",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"version": "5.10.54",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.13.*",
"status": "unaffected",
"version": "5.13.6",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "5.14",
"versionType": "original_commit_for_fix"
}
]
}
],
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
],
"configurations": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"matchCriteriaId": "4A97ECD5-9A3B-4EE9-A36C-902077EAD62D",
"versionEndExcluding": "5.10.54",
"versionStartIncluding": "5.9",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"matchCriteriaId": "512C22FC-1524-4E6F-9E62-4F4B7B6E0576",
"versionEndExcluding": "5.13.6",
"versionStartIncluding": "5.11",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:5.14:rc1:*:*:*:*:*:*",
"matchCriteriaId": "71268287-21A8-4488-AA4F-23C473153131",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:5.14:rc2:*:*:*:*:*:*",
"matchCriteriaId": "23B9E5C6-FAB5-4A02-9E39-27C8787B0991",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nxdp, net: Fix use-after-free in bpf_xdp_link_release\n\nThe problem occurs between dev_get_by_index() and dev_xdp_attach_link().\nAt this point, dev_xdp_uninstall() is called. Then xdp link will not be\ndetached automatically when dev is released. But link-\u003edev already\npoints to dev, when xdp link is released, dev will still be accessed,\nbut dev has been released.\n\ndev_get_by_index() |\nlink-\u003edev = dev |\n | rtnl_lock()\n | unregister_netdevice_many()\n | dev_xdp_uninstall()\n | rtnl_unlock()\nrtnl_lock(); |\ndev_xdp_attach_link() |\nrtnl_unlock(); |\n | netdev_run_todo() // dev released\nbpf_xdp_link_release() |\n /* access dev. |\n use-after-free */ |\n\n[ 45.966867] BUG: KASAN: use-after-free in bpf_xdp_link_release+0x3b8/0x3d0\n[ 45.967619] Read of size 8 at addr ffff00000f9980c8 by task a.out/732\n[ 45.968297]\n[ 45.968502] CPU: 1 PID: 732 Comm: a.out Not tainted 5.13.0+ #22\n[ 45.969222] Hardware name: linux,dummy-virt (DT)\n[ 45.969795] Call trace:\n[ 45.970106] dump_backtrace+0x0/0x4c8\n[ 45.970564] show_stack+0x30/0x40\n[ 45.970981] dump_stack_lvl+0x120/0x18c\n[ 45.971470] print_address_description.constprop.0+0x74/0x30c\n[ 45.972182] kasan_report+0x1e8/0x200\n[ 45.972659] __asan_report_load8_noabort+0x2c/0x50\n[ 45.973273] bpf_xdp_link_release+0x3b8/0x3d0\n[ 45.973834] bpf_link_free+0xd0/0x188\n[ 45.974315] bpf_link_put+0x1d0/0x218\n[ 45.974790] bpf_link_release+0x3c/0x58\n[ 45.975291] __fput+0x20c/0x7e8\n[ 45.975706] ____fput+0x24/0x30\n[ 45.976117] task_work_run+0x104/0x258\n[ 45.976609] do_notify_resume+0x894/0xaf8\n[ 45.977121] work_pending+0xc/0x328\n[ 45.977575]\n[ 45.977775] The buggy address belongs to the page:\n[ 45.978369] page:fffffc00003e6600 refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x4f998\n[ 45.979522] flags: 0x7fffe0000000000(node=0|zone=0|lastcpupid=0x3ffff)\n[ 45.980349] raw: 07fffe0000000000 fffffc00003e6708 ffff0000dac3c010 0000000000000000\n[ 45.981309] raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000\n[ 45.982259] page dumped because: kasan: bad access detected\n[ 45.982948]\n[ 45.983153] Memory state around the buggy address:\n[ 45.983753] ffff00000f997f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc\n[ 45.984645] ffff00000f998000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff\n[ 45.985533] \u003effff00000f998080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff\n[ 45.986419] ^\n[ 45.987112] ffff00000f998100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff\n[ 45.988006] ffff00000f998180: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff\n[ 45.988895] ==================================================================\n[ 45.989773] Disabling lock debugging due to kernel taint\n[ 45.990552] Kernel panic - not syncing: panic_on_warn set ...\n[ 45.991166] CPU: 1 PID: 732 Comm: a.out Tainted: G B 5.13.0+ #22\n[ 45.991929] Hardware name: linux,dummy-virt (DT)\n[ 45.992448] Call trace:\n[ 45.992753] dump_backtrace+0x0/0x4c8\n[ 45.993208] show_stack+0x30/0x40\n[ 45.993627] dump_stack_lvl+0x120/0x18c\n[ 45.994113] dump_stack+0x1c/0x34\n[ 45.994530] panic+0x3a4/0x7d8\n[ 45.994930] end_report+0x194/0x198\n[ 45.995380] kasan_report+0x134/0x200\n[ 45.995850] __asan_report_load8_noabort+0x2c/0x50\n[ 45.996453] bpf_xdp_link_release+0x3b8/0x3d0\n[ 45.997007] bpf_link_free+0xd0/0x188\n[ 45.997474] bpf_link_put+0x1d0/0x218\n[ 45.997942] bpf_link_release+0x3c/0x58\n[ 45.998429] __fput+0x20c/0x7e8\n[ 45.998833] ____fput+0x24/0x30\n[ 45.999247] task_work_run+0x104/0x258\n[ 45.999731] do_notify_resume+0x894/0xaf8\n[ 46.000236] work_pending\n---truncated---"
},
{
"lang": "es",
"value": "En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: xdp, net: corrige use-after-free en bpf_xdp_link_release. El problema ocurre entre dev_get_by_index() y dev_xdp_attach_link(). En este punto, se llama a dev_xdp_uninstall(). Entonces el enlace xdp no se desconectar\u00e1 autom\u00e1ticamente cuando se libere el desarrollador. Pero link-\u0026gt;dev ya apunta a dev, cuando se libera el enlace xdp, se seguir\u00e1 accediendo a dev, pero se ha liberado. dev_get_by_index() | enlace-\u0026gt;dev = dev | | rtnl_lock() | unregister_netdevice_many() | dev_xdp_uninstall() | rtnl_unlock() rtnl_lock(); | dev_xdp_attach_link() | rtnl_unlock(); | | netdev_run_todo() // desarrollador liberado bpf_xdp_link_release() | /* accede al desarrollador. | use after free */ | [45.966867] BUG: KASAN: use after free en bpf_xdp_link_release+0x3b8/0x3d0 [45.967619] Lectura del tama\u00f1o 8 en la direcci\u00f3n ffff00000f9980c8 por tarea a.out/732 [45.968297] [45.968502] CPU: 1 PID: Comunicaciones 732: un .out No contaminado 5.13.0+ #22 [ 45.969222] Nombre de hardware: linux,dummy-virt (DT) [ 45.969795] Seguimiento de llamadas: [ 45.970106] dump_backtrace+0x0/0x4c8 [ 45.970564] show_stack+0x30/0x40 [ 45.970981 ] dump_stack_lvl +0x120/0x18c [ 45.971470] print_address_description.constprop.0+0x74/0x30c [ 45.972182] kasan_report+0x1e8/0x200 [ 45.972659] __asan_report_load8_noabort+0x2c/0x50 [ 45.97327 3] bpf_xdp_link_release+0x3b8/0x3d0 [ 45.973834] bpf_link_free+0xd0/0x188 [ 45.974315 ] bpf_link_put+0x1d0/0x218 [ 45.974790] bpf_link_release+0x3c/0x58 [ 45.975291] __fput+0x20c/0x7e8 [ 45.975706] ____fput+0x24/0x30 [ 45.976117] 104/0x258 [ 45.976609] do_notify_resume+0x894/0xaf8 [ 45.977121] work_pending +0xc/0x328 [ 45.977575] [ 45.977775] La direcci\u00f3n del error pertenece a la p\u00e1gina: [ 45.978369] p\u00e1gina:fffffc00003e6600 refcount:0 mapcount:0 mapeo:00000000000000000 index:0x0 pfn:0x4f998 [ 45.97952 2] banderas: 0x7fffe0000000000(nodo=0| zona=0|lastcpupid=0x3ffff) [ 45.980349] raw: 07fffe0000000000 ffffc00003e6708 ffff0000dac3c010 0000000000000000 [ 45.981309] raw: 0000000000000000 000000000000000 00000000ffffffff 0000000000000000 [ 45.982259] p\u00e1gina volcada porque: kasan: mal acceso detectado [ 45.982948] [ 45.983153] Estado de la memoria alrededor de la direcci\u00f3n con errores : [ 45.983753] ffff00000f997f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 45.984645] ffff00000f998000: ff ff ff ff ff ff ff ff ff ff ff ff ff [ 45.985533] \u0026gt;ffff00000f998080:ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff [ 45.986419] ^ [ 45.987112] ffff00000f998100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff [ 45.988006] f998180: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff [ 45.988895] ===================================== ============================== [ 45.989773] Deshabilitar la depuraci\u00f3n de bloqueo debido a corrupci\u00f3n del kernel [ 45.990552] P\u00e1nico del kernel - no sincronizar: panic_on_warn establecido... [ 45.991166] CPU: 1 PID: 732 Comm: a.out Contaminado: GB 5.13.0+ #22 [ 45.991929] Nombre de hardware: linux,dummy-virt (DT) [ 45.992448] Seguimiento de llamadas: [ 45.992753] dump_backtrace+0x0/0x4c8 [ 45.993208] show_stack+0x30/0x40 [ 45.993627] dump_stack_lvl+0x120/0x18c [ 45.994113] dump_stack+0x1c/0x34 [ 45.994530 panic+0x3a4/0x7d 8 [ 45.994930] end_report+0x194/0x198 [ 45.995380] kasan_report+ 0x134/0x200 [ 45.995850] __asan_report_load8_noabort+0x2c/0x50 [ 45.996453] bpf_xdp_link_release+0x3b8/0x3d0 [ 45.997007] bpf_link_free+0xd0/0x188 [ 45.99747 4] bpf_link_put+0x1d0/0x218 [ 45.997942] bpf_link_release+0x3c/0x58 [ 45.998429] __fput+0x20c/ 0x7e8 [ 45.998833] ____fput+0x24/0x30 [ 45.999247] task_work_run+0x104/0x258 [ 45.999731] do_notify_resume+0x894/0xaf8 [ 46.000236] work_pending ---truncado---"
}
],
"id": "CVE-2021-47299",
"lastModified": "2026-06-17T04:17:08.247",
"metrics": {
"cvssMetricV31": [
{
"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"
}
],
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
"id": "CVE-2021-47299",
"options": [
{
"exploitation": "none"
},
{
"automatable": "no"
},
{
"technicalImpact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2024-09-10T15:39:22.390022Z",
"version": "2.0.3"
}
}
]
},
"published": "2024-05-21T15:15:17.743",
"references": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/5acc7d3e8d342858405fbbc671221f676b547ce7"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/a7537dc73e69ad9c0b67ad24ad3ebee954ed0af6"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/ca9ba1de8f09976b45ccc8e655c51c6201992139"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/5acc7d3e8d342858405fbbc671221f676b547ce7"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/a7537dc73e69ad9c0b67ad24ad3ebee954ed0af6"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/ca9ba1de8f09976b45ccc8e655c51c6201992139"
}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Analyzed",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-416"
}
],
"source": "nvd@nist.gov",
"type": "Primary"
}
]
}
},
"redhat_vex": {
"aggregate_severity": "Moderate",
"current_release_date": "2025-11-21T14:10:30+00:00",
"cve": "CVE-2021-47299",
"id": "CVE-2021-47299",
"initial_release_date": "2021-01-01T00:00:00+00:00",
"product_status:known_affected": "42",
"product_status:known_not_affected": "156",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: xdp, net: Fix use-after-free in bpf_xdp_link_release",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-47299.json",
"version": "3"
},
"vulnrichment": {
"containers": {
"adp": [
{
"providerMetadata": {
"dateUpdated": "2024-08-04T05:32:08.438Z",
"orgId": "af854a3a-2127-422b-91ae-364da2661108",
"shortName": "CVE"
},
"references": [
{
"tags": [
"x_transferred"
],
"url": "https://git.kernel.org/stable/c/ca9ba1de8f09976b45ccc8e655c51c6201992139"
},
{
"tags": [
"x_transferred"
],
"url": "https://git.kernel.org/stable/c/a7537dc73e69ad9c0b67ad24ad3ebee954ed0af6"
},
{
"tags": [
"x_transferred"
],
"url": "https://git.kernel.org/stable/c/5acc7d3e8d342858405fbbc671221f676b547ce7"
}
],
"title": "CVE Program Container"
},
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2021-47299",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2024-09-10T15:39:22.390022Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2024-09-11T12:42:19.659Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"net/core/dev.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "ca9ba1de8f09",
"status": "affected",
"version": "aa8d3a716b59",
"versionType": "git"
},
{
"lessThan": "a7537dc73e69",
"status": "affected",
"version": "aa8d3a716b59",
"versionType": "git"
},
{
"lessThan": "5acc7d3e8d34",
"status": "affected",
"version": "aa8d3a716b59",
"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"net/core/dev.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "5.9"
},
{
"lessThan": "5.9",
"status": "unaffected",
"version": "0",
"versionType": "custom"
},
{
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"version": "5.10.54",
"versionType": "custom"
},
{
"lessThanOrEqual": "5.13.*",
"status": "unaffected",
"version": "5.13.6",
"versionType": "custom"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "5.14",
"versionType": "original_commit_for_fix"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nxdp, net: Fix use-after-free in bpf_xdp_link_release\n\nThe problem occurs between dev_get_by_index() and dev_xdp_attach_link().\nAt this point, dev_xdp_uninstall() is called. Then xdp link will not be\ndetached automatically when dev is released. But link-\u003edev already\npoints to dev, when xdp link is released, dev will still be accessed,\nbut dev has been released.\n\ndev_get_by_index() |\nlink-\u003edev = dev |\n | rtnl_lock()\n | unregister_netdevice_many()\n | dev_xdp_uninstall()\n | rtnl_unlock()\nrtnl_lock(); |\ndev_xdp_attach_link() |\nrtnl_unlock(); |\n | netdev_run_todo() // dev released\nbpf_xdp_link_release() |\n /* access dev. |\n use-after-free */ |\n\n[ 45.966867] BUG: KASAN: use-after-free in bpf_xdp_link_release+0x3b8/0x3d0\n[ 45.967619] Read of size 8 at addr ffff00000f9980c8 by task a.out/732\n[ 45.968297]\n[ 45.968502] CPU: 1 PID: 732 Comm: a.out Not tainted 5.13.0+ #22\n[ 45.969222] Hardware name: linux,dummy-virt (DT)\n[ 45.969795] Call trace:\n[ 45.970106] dump_backtrace+0x0/0x4c8\n[ 45.970564] show_stack+0x30/0x40\n[ 45.970981] dump_stack_lvl+0x120/0x18c\n[ 45.971470] print_address_description.constprop.0+0x74/0x30c\n[ 45.972182] kasan_report+0x1e8/0x200\n[ 45.972659] __asan_report_load8_noabort+0x2c/0x50\n[ 45.973273] bpf_xdp_link_release+0x3b8/0x3d0\n[ 45.973834] bpf_link_free+0xd0/0x188\n[ 45.974315] bpf_link_put+0x1d0/0x218\n[ 45.974790] bpf_link_release+0x3c/0x58\n[ 45.975291] __fput+0x20c/0x7e8\n[ 45.975706] ____fput+0x24/0x30\n[ 45.976117] task_work_run+0x104/0x258\n[ 45.976609] do_notify_resume+0x894/0xaf8\n[ 45.977121] work_pending+0xc/0x328\n[ 45.977575]\n[ 45.977775] The buggy address belongs to the page:\n[ 45.978369] page:fffffc00003e6600 refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x4f998\n[ 45.979522] flags: 0x7fffe0000000000(node=0|zone=0|lastcpupid=0x3ffff)\n[ 45.980349] raw: 07fffe0000000000 fffffc00003e6708 ffff0000dac3c010 0000000000000000\n[ 45.981309] raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000\n[ 45.982259] page dumped because: kasan: bad access detected\n[ 45.982948]\n[ 45.983153] Memory state around the buggy address:\n[ 45.983753] ffff00000f997f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc\n[ 45.984645] ffff00000f998000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff\n[ 45.985533] \u003effff00000f998080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff\n[ 45.986419] ^\n[ 45.987112] ffff00000f998100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff\n[ 45.988006] ffff00000f998180: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff\n[ 45.988895] ==================================================================\n[ 45.989773] Disabling lock debugging due to kernel taint\n[ 45.990552] Kernel panic - not syncing: panic_on_warn set ...\n[ 45.991166] CPU: 1 PID: 732 Comm: a.out Tainted: G B 5.13.0+ #22\n[ 45.991929] Hardware name: linux,dummy-virt (DT)\n[ 45.992448] Call trace:\n[ 45.992753] dump_backtrace+0x0/0x4c8\n[ 45.993208] show_stack+0x30/0x40\n[ 45.993627] dump_stack_lvl+0x120/0x18c\n[ 45.994113] dump_stack+0x1c/0x34\n[ 45.994530] panic+0x3a4/0x7d8\n[ 45.994930] end_report+0x194/0x198\n[ 45.995380] kasan_report+0x134/0x200\n[ 45.995850] __asan_report_load8_noabort+0x2c/0x50\n[ 45.996453] bpf_xdp_link_release+0x3b8/0x3d0\n[ 45.997007] bpf_link_free+0xd0/0x188\n[ 45.997474] bpf_link_put+0x1d0/0x218\n[ 45.997942] bpf_link_release+0x3c/0x58\n[ 45.998429] __fput+0x20c/0x7e8\n[ 45.998833] ____fput+0x24/0x30\n[ 45.999247] task_work_run+0x104/0x258\n[ 45.999731] do_notify_resume+0x894/0xaf8\n[ 46.000236] work_pending\n---truncated---"
}
],
"providerMetadata": {
"dateUpdated": "2024-05-29T05:05:31.530Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/ca9ba1de8f09976b45ccc8e655c51c6201992139"
},
{
"url": "https://git.kernel.org/stable/c/a7537dc73e69ad9c0b67ad24ad3ebee954ed0af6"
},
{
"url": "https://git.kernel.org/stable/c/5acc7d3e8d342858405fbbc671221f676b547ce7"
}
],
"title": "xdp, net: Fix use-after-free in bpf_xdp_link_release",
"x_generator": {
"engine": "bippy-a5840b7849dd"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2021-47299",
"datePublished": "2024-05-21T14:35:21.276Z",
"dateReserved": "2024-05-21T13:27:52.132Z",
"dateUpdated": "2024-09-11T17:33:55.680Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.1"
}
}
}
Loading…
Loading…
Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.
Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
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
Sightings and recorded dates, grouped by day · UTC
Loading timeline…
Loading…
Loading…
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.
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.
Loading…
Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.