{"answers":{"affected":"It affects 2 products.","exploited":"There is no known exploitation of CVE-2021-47247 in the wild and no public exploit code.","fix":"Apply the vendor's patch.","what":"CVE-2021-47247 is a high-severity use after free vulnerability in Debian Debian Linux, published on 21 May 2024. It can only be exploited from the same machine or local network, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2021-47247 and fix it if it is affected.\n\nWhat it is: CVE-2021-47247 is a high-severity use after free vulnerability in Debian Debian Linux, published on 21 May 2024. It can only be exploited from the same machine or local network, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2021-47247 in the wild and no public exploit code.\n\nAffected product: Debian Debian Linux. No package-level version data is available, so check the vendor advisory linked from the reference page.\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2021-47247/ (Markdown: https://insights.sbomify.com/CVE-2021-47247/index.md)","id":"CVE-2021-47247","markdown":"https://insights.sbomify.com/CVE-2021-47247/index.md","name":"CVE-2021-47247","record":{"aliases":["DEBIAN-CVE-2021-47247","GHSA-2hh5-254v-jpf4","UBUNTU-CVE-2021-47247"],"analysis":{"component_type":"kernel","fix_type":"patch","impacts":["code_execution","privilege_escalation"],"network_reachable":"adjacent_or_local","non_default_config":false,"product_category":"Linux kernel","requires_auth":"low_privilege","summary":"A use-after-free vulnerability in the Linux kernel's mlx5e driver allows local attackers to potentially execute arbitrary code or escalate privileges.","user_interaction":"not_required","vuln_class":"use_after_free"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"Linux","cpe":[{"product":"debian_linux","vendor":"debian"},{"product":"linux_kernel","vendor":"linux"}],"cvss":{"score":7.8,"severity":"high","source":"cna","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","version":"3.1"},"cwes":[{"id":"CWE-416","name":"Use After Free"}],"description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet/mlx5e: Fix use-after-free of encap entry in neigh update handler\n\nFunction mlx5e_rep_neigh_update() wasn't updated to accommodate rtnl lock\nremoval from TC filter update path and properly handle concurrent encap\nentry insertion/deletion which can lead to following use-after-free:\n\n [23827.464923] ==================================================================\n [23827.469446] BUG: KASAN: use-after-free in mlx5e_encap_take+0x72/0x140 [mlx5_core]\n [23827.470971] Read of size 4 at addr ffff8881d132228c by task kworker/u20:6/21635\n [23827.472251]\n [23827.472615] CPU: 9 PID: 21635 Comm: kworker/u20:6 Not tainted 5.13.0-rc3+ #5\n [23827.473788] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.13.0-0-gf21b5a4aeb02-prebuilt.qemu.org 04/01/2014\n [23827.475639] Workqueue: mlx5e mlx5e_rep_neigh_update [mlx5_core]\n [23827.476731] Call Trace:\n [23827.477260]  dump_stack+0xbb/0x107\n [23827.477906]  print_address_description.constprop.0+0x18/0x140\n [23827.478896]  ? mlx5e_encap_take+0x72/0x140 [mlx5_core]\n [23827.479879]  ? mlx5e_encap_take+0x72/0x140 [mlx5_core]\n [23827.480905]  kasan_report.cold+0x7c/0xd8\n [23827.481701]  ? mlx5e_encap_take+0x72/0x140 [mlx5_core]\n [23827.482744]  kasan_check_range+0x145/0x1a0\n [23827.493112]  mlx5e_encap_take+0x72/0x140 [mlx5_core]\n [23827.494054]  ? mlx5e_tc_tun_encap_info_equal_generic+0x140/0x140 [mlx5_core]\n [23827.495296]  mlx5e_rep_neigh_update+0x41e/0x5e0 [mlx5_core]\n [23827.496338]  ? mlx5e_rep_neigh_entry_release+0xb80/0xb80 [mlx5_core]\n [23827.497486]  ? read_word_at_a_time+0xe/0x20\n [23827.498250]  ? strscpy+0xa0/0x2a0\n [23827.498889]  process_one_work+0x8ac/0x14e0\n [23827.499638]  ? lockdep_hardirqs_on_prepare+0x400/0x400\n [23827.500537]  ? pwq_dec_nr_in_flight+0x2c0/0x2c0\n [23827.501359]  ? rwlock_bug.part.0+0x90/0x90\n [23827.502116]  worker_thread+0x53b/0x1220\n [23827.502831]  ? process_one_work+0x14e0/0x14e0\n [23827.503627]  kthread+0x328/0x3f0\n [23827.504254]  ? _raw_spin_unlock_irq+0x24/0x40\n [23827.505065]  ? __kthread_bind_mask+0x90/0x90\n [23827.505912]  ret_from_fork+0x1f/0x30\n [23827.506621]\n [23827.506987] Allocated by task 28248:\n [23827.507694]  kasan_save_stack+0x1b/0x40\n [23827.508476]  __kasan_kmalloc+0x7c/0x90\n [23827.509197]  mlx5e_attach_encap+0xde1/0x1d40 [mlx5_core]\n [23827.510194]  mlx5e_tc_add_fdb_flow+0x397/0xc40 [mlx5_core]\n [23827.511218]  __mlx5e_add_fdb_flow+0x519/0xb30 [mlx5_core]\n [23827.512234]  mlx5e_configure_flower+0x191c/0x4870 [mlx5_core]\n [23827.513298]  tc_setup_cb_add+0x1d5/0x420\n [23827.514023]  fl_hw_replace_filter+0x382/0x6a0 [cls_flower]\n [23827.514975]  fl_change+0x2ceb/0x4a51 [cls_flower]\n [23827.515821]  tc_new_tfilter+0x89a/0x2070\n [23827.516548]  rtnetlink_rcv_msg+0x644/0x8c0\n [23827.517300]  netlink_rcv_skb+0x11d/0x340\n [23827.518021]  netlink_unicast+0x42b/0x700\n [23827.518742]  netlink_sendmsg+0x743/0xc20\n [23827.519467]  sock_sendmsg+0xb2/0xe0\n [23827.520131]  ____sys_sendmsg+0x590/0x770\n [23827.520851]  ___sys_sendmsg+0xd8/0x160\n [23827.521552]  __sys_sendmsg+0xb7/0x140\n [23827.522238]  do_syscall_64+0x3a/0x70\n [23827.522907]  entry_SYSCALL_64_after_hwframe+0x44/0xae\n [23827.523797]\n [23827.524163] Freed by task 25948:\n [23827.524780]  kasan_save_stack+0x1b/0x40\n [23827.525488]  kasan_set_track+0x1c/0x30\n [23827.526187]  kasan_set_free_info+0x20/0x30\n [23827.526968]  __kasan_slab_free+0xed/0x130\n [23827.527709]  slab_free_freelist_hook+0xcf/0x1d0\n [23827.528528]  kmem_cache_free_bulk+0x33a/0x6e0\n [23827.529317]  kfree_rcu_work+0x55f/0xb70\n [23827.530024]  process_one_work+0x8ac/0x14e0\n [23827.530770]  worker_thread+0x53b/0x1220\n [23827.531480]  kthread+0x328/0x3f0\n [23827.532114]  ret_from_fork+0x1f/0x30\n [23827.532785]\n [23827.533147] Last potentially related work creation:\n [23827.534007]  kasan_save_stack+0x1b/0x40\n [23827.534710]  kasan_record_aux_stack+0xab/0xc0\n [23827.535492]  kvfree_call_rcu+0x31/0x7b0\n [23827.536206]  mlx5e_tc_del\n---truncated---","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":true,"headline":"net/mlx5e: Fix use-after-free of encap entry in neigh update handler","id":"CVE-2021-47247","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":"debian:debian_linux","products":["debian:debian_linux","linux:linux_kernel"],"type":"use_after_free","year":"2021"},"n_packages":0,"n_references":3,"next":{"headline":"udp: fix race between close() and udp_abort()","id":"CVE-2021-47248"},"packages":[],"prev":{"headline":"net/mlx5e: Fix page reclaim for dead peer hairpin","id":"CVE-2021-47246"},"products":["Linux"],"published":"2024-05-21","related":[{"cvss_score":10,"headline":"ProFTPD Improper Access Control","id":"CVE-2015-3306","kev_date_added":"2026-10-08","published":"2015-05-18"},{"cvss_score":9.9,"headline":"RoundCube Webmail Deserialization of Untrusted Data","id":"CVE-2025-49113","kev_date_added":"2026-02-20","published":"2025-06-02"},{"cvss_score":9.8,"headline":"GNU InetUtils Argument Injection","id":"CVE-2026-24061","kev_date_added":"2026-01-26","published":"2026-01-21"},{"cvss_score":9.8,"headline":"Linux Kernel Improper Check for Unusual or Exceptional Conditions","id":"CVE-2025-39682","kev_date_added":"2026-09-18","published":"2025-09-05"},{"cvss_score":9.8,"headline":"Mozilla Firefox Use-After-Free","id":"CVE-2024-9680","kev_date_added":"2024-10-15","published":"2024-10-09"},{"cvss_score":9.8,"headline":"RARLAB UnRAR Directory Traversal","id":"CVE-2022-30333","kev_date_added":"2022-08-09","published":"2022-05-09"},{"cvss_score":9.8,"headline":"Roundcube Webmail SQL Injection","id":"CVE-2021-44026","kev_date_added":"2023-06-22","published":"2021-11-19"}],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"US public information, NVD API terms","name":"NVD"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"no","exploitation":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-08-05","vendors":["Linux"]},"summary":"A use-after-free vulnerability in the Linux kernel's mlx5e driver allows local attackers to potentially execute arbitrary code or escalate privileges.","url":"https://insights.sbomify.com/CVE-2021-47247/"}