CVE-2021-47299

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2021-47299", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-05-21T13:27:52.132Z", "datePublished": "2024-05-21T14:35:21.276Z", "dateUpdated": "2026-05-11T13:51:48.198Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-05-11T13:51:48.198Z"}, "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->dev 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->dev = 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] >ffff00000f998080: 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---"}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/core/dev.c"], "versions": [{"version": "aa8d3a716b59db6c1ad6c68fb8aa05e31980da60", "lessThan": "ca9ba1de8f09976b45ccc8e655c51c6201992139", "status": "affected", "versionType": "git"}, {"version": "aa8d3a716b59db6c1ad6c68fb8aa05e31980da60", "lessThan": "a7537dc73e69ad9c0b67ad24ad3ebee954ed0af6", "status": "affected", "versionType": "git"}, {"version": "aa8d3a716b59db6c1ad6c68fb8aa05e31980da60", "lessThan": "5acc7d3e8d342858405fbbc671221f676b547ce7", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/core/dev.c"], "versions": [{"version": "5.9", "status": "affected"}, {"version": "0", "lessThan": "5.9", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.54", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.13.6", "lessThanOrEqual": "5.13.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.14", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.9", "versionEndExcluding": "5.10.54"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.9", "versionEndExcluding": "5.13.6"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.9", "versionEndExcluding": "5.14"}]}]}], "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"}}, "adp": [{"providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-04T05:32:08.438Z"}, "title": "CVE Program Container", "references": [{"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", "tags": ["x_transferred"]}]}, {"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2021-47299", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2024-09-10T15:39:22.390022Z"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-09-11T17:33:55.680Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CVE Program Container", "references": [{"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", "tags": ["x_transferred"]}], "providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-04T05:32:08.438Z"}}, {"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2021-47299", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2024-09-10T15:39:22.390022Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-09-11T12:42:19.659Z"}}], "cna": {"title": "xdp, net: Fix use-after-free in bpf_xdp_link_release", "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "aa8d3a716b59", "lessThan": "ca9ba1de8f09", "versionType": "git"}, {"status": "affected", "version": "aa8d3a716b59", "lessThan": "a7537dc73e69", "versionType": "git"}, {"status": "affected", "version": "aa8d3a716b59", "lessThan": "5acc7d3e8d34", "versionType": "git"}], "programFiles": ["net/core/dev.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "5.9"}, {"status": "unaffected", "version": "0", "lessThan": "5.9", "versionType": "custom"}, {"status": "unaffected", "version": "5.10.54", "versionType": "custom", "lessThanOrEqual": "5.10.*"}, {"status": "unaffected", "version": "5.13.6", "versionType": "custom", "lessThanOrEqual": "5.13.*"}, {"status": "unaffected", "version": "5.14", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["net/core/dev.c"], "defaultStatus": "affected"}], "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"}], "x_generator": {"engine": "bippy-a5840b7849dd"}, "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->dev 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->dev = 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] >ffff00000f998080: 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": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2024-05-29T05:05:31.530Z"}}}, "cveMetadata": {"cveId": "CVE-2021-47299", "state": "PUBLISHED", "dateUpdated": "2024-09-11T17:33:55.680Z", "dateReserved": "2024-05-21T13:27:52.132Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2024-05-21T14:35:21.276Z", "assignerShortName": "Linux"}, "dataVersion": "5.1"}

{"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->dev 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->dev = 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] >ffff00000f998080: 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->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->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] >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"}]}

{"bugzilla": {"description": "kernel: xdp, net: Fix use-after-free in bpf_xdp_link_release", "id": "2282484", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2282484"}, "csaw": false, "cvss3": {"cvss3_base_score": "6.6", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:H", "status": "draft"}, "cwe": "CWE-416", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nxdp, net: Fix use-after-free in bpf_xdp_link_release\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->dev already\npoints to dev, when xdp link is released, dev will still be accessed,\nbut dev has been released.\ndev_get_by_index() |\nlink->dev = 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. |\nuse-after-free */ |\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] >ffff00000f998080: 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---"], "name": "CVE-2021-47299", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-05-21T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2021-47299\nhttps://nvd.nist.gov/vuln/detail/CVE-2021-47299\nhttps://lore.kernel.org/linux-cve-announce/2024052125-CVE-2021-47299-e1d9@gregkh/T"], "threat_severity": "Moderate"}

{}