{"answers":{"affected":"It affects 1 product.","exploited":"There is no known exploitation of CVE-2021-47598 in the wild and no public exploit code.","fix":"Apply the vendor's patch.","what":"CVE-2021-47598 is a high-severity use after free vulnerability in Linux kernel, published on 19 Jun 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-2021-47598 and fix it if it is affected.\n\nWhat it is: CVE-2021-47598 is a high-severity use after free vulnerability in Linux kernel, published on 19 Jun 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-2021-47598 in the wild and no public exploit code.\n\nAffected product: Linux kernel. 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-2021-47598/ (Markdown: https://insights.sbomify.com/CVE-2021-47598/index.md)","id":"CVE-2021-47598","markdown":"https://insights.sbomify.com/CVE-2021-47598/index.md","name":"CVE-2021-47598","record":{"aliases":["DEBIAN-CVE-2021-47598","GHSA-h7wh-wpqg-g2jm","UBUNTU-CVE-2021-47598"],"analysis":{"component_type":"kernel","fix_type":"patch","impacts":["denial_of_service","code_execution"],"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 sch_cake qdisc allows local attackers to cause a denial of service or potentially execute code.","user_interaction":"not_required","vuln_class":"use_after_free"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"Linux","cpe":[{"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\nsch_cake: do not call cake_destroy() from cake_init()\n\nqdiscs are not supposed to call their own destroy() method\nfrom init(), because core stack already does that.\n\nsyzbot was able to trigger use after free:\n\nDEBUG_LOCKS_WARN_ON(lock-\u003emagic != lock)\nWARNING: CPU: 0 PID: 21902 at kernel/locking/mutex.c:586 __mutex_lock_common kernel/locking/mutex.c:586 [inline]\nWARNING: CPU: 0 PID: 21902 at kernel/locking/mutex.c:586 __mutex_lock+0x9ec/0x12f0 kernel/locking/mutex.c:740\nModules linked in:\nCPU: 0 PID: 21902 Comm: syz-executor189 Not tainted 5.16.0-rc4-syzkaller #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011\nRIP: 0010:__mutex_lock_common kernel/locking/mutex.c:586 [inline]\nRIP: 0010:__mutex_lock+0x9ec/0x12f0 kernel/locking/mutex.c:740\nCode: 08 84 d2 0f 85 19 08 00 00 8b 05 97 38 4b 04 85 c0 0f 85 27 f7 ff ff 48 c7 c6 20 00 ac 89 48 c7 c7 a0 fe ab 89 e8 bf 76 ba ff \u003c0f\u003e 0b e9 0d f7 ff ff 48 8b 44 24 40 48 8d b8 c8 08 00 00 48 89 f8\nRSP: 0018:ffffc9000627f290 EFLAGS: 00010282\nRAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000\nRDX: ffff88802315d700 RSI: ffffffff815f1db8 RDI: fffff52000c4fe44\nRBP: ffff88818f28e000 R08: 0000000000000000 R09: 0000000000000000\nR10: ffffffff815ebb5e R11: 0000000000000000 R12: 0000000000000000\nR13: dffffc0000000000 R14: ffffc9000627f458 R15: 0000000093c30000\nFS:  0000555556abc400(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000\nCS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\nCR2: 00007fda689c3303 CR3: 000000001cfbb000 CR4: 0000000000350ef0\nCall Trace:\n \u003cTASK\u003e\n tcf_chain0_head_change_cb_del+0x2e/0x3d0 net/sched/cls_api.c:810\n tcf_block_put_ext net/sched/cls_api.c:1381 [inline]\n tcf_block_put_ext net/sched/cls_api.c:1376 [inline]\n tcf_block_put+0xbc/0x130 net/sched/cls_api.c:1394\n cake_destroy+0x3f/0x80 net/sched/sch_cake.c:2695\n qdisc_create.constprop.0+0x9da/0x10f0 net/sched/sch_api.c:1293\n tc_modify_qdisc+0x4c5/0x1980 net/sched/sch_api.c:1660\n rtnetlink_rcv_msg+0x413/0xb80 net/core/rtnetlink.c:5571\n netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2496\n netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline]\n netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1345\n netlink_sendmsg+0x904/0xdf0 net/netlink/af_netlink.c:1921\n sock_sendmsg_nosec net/socket.c:704 [inline]\n sock_sendmsg+0xcf/0x120 net/socket.c:724\n ____sys_sendmsg+0x6e8/0x810 net/socket.c:2409\n ___sys_sendmsg+0xf3/0x170 net/socket.c:2463\n __sys_sendmsg+0xe5/0x1b0 net/socket.c:2492\n do_syscall_x64 arch/x86/entry/common.c:50 [inline]\n do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80\n entry_SYSCALL_64_after_hwframe+0x44/0xae\nRIP: 0033:0x7f1bb06badb9\nCode: Unable to access opcode bytes at RIP 0x7f1bb06bad8f.\nRSP: 002b:00007fff3012a658 EFLAGS: 00000246 ORIG_RAX: 000000000000002e\nRAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007f1bb06badb9\nRDX: 0000000000000000 RSI: 00000000200007c0 RDI: 0000000000000003\nRBP: 0000000000000000 R08: 0000000000000003 R09: 0000000000000003\nR10: 0000000000000003 R11: 0000000000000246 R12: 00007fff3012a688\nR13: 00007fff3012a6a0 R14: 00007fff3012a6e0 R15: 00000000000013c2\n \u003c/TASK\u003e","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":"sch_cake: do not call cake_destroy() from cake_init()","id":"CVE-2021-47598","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":"linux:linux_kernel","products":["linux:linux_kernel"],"type":"use_after_free","year":"2021"},"n_packages":0,"n_references":5,"next":{"headline":"btrfs: use latest_dev in btrfs_show_devname","id":"CVE-2021-47599"},"packages":[],"prev":{"headline":"inet_diag: fix kernel-infoleak for UDP sockets","id":"CVE-2021-47597"},"products":["Linux"],"published":"2024-06-19","related":[{"cvss_score":8.8,"headline":"Linux Kernel Out-of-Bounds Write","id":"CVE-2026-53266","kev_date_added":"2026-09-18","published":"2026-06-25"},{"cvss_score":8.8,"headline":"Linux Kernel Improper Input Validation","id":"CVE-2013-6282","kev_date_added":"2022-09-15","published":"2013-11-19"},{"cvss_score":8.4,"headline":"Linux Kernel Heap-Based Buffer Overflow","id":"CVE-2022-0185","kev_date_added":"2024-08-21","published":"2022-02-11"},{"cvss_score":8.4,"headline":"Linux Kernel Privilege Escalation","id":"CVE-2013-2094","kev_date_added":"2022-09-15","published":"2013-05-14"},{"cvss_score":7.8,"headline":"Linux Kernel Unspecified","id":"CVE-2026-53362","kev_date_added":"2026-08-27","published":"2026-07-04"},{"cvss_score":7.8,"headline":"Linux Kernel Missing Initialization of a Variable","id":"CVE-2026-46300","kev_date_added":"2026-10-28","published":"2026-05-23"},{"cvss_score":7.8,"headline":"Linux Kernel Race Condition","id":"CVE-2025-39964","kev_date_added":"2026-09-18","published":"2025-10-13"}],"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 sch_cake qdisc allows local attackers to cause a denial of service or potentially execute code.","url":"https://insights.sbomify.com/CVE-2021-47598/"}