{"answers":{"affected":"It affects 1 product.","exploited":"There is no known exploitation of CVE-2021-47302 in the wild and no public exploit code.","fix":"Apply the vendor's patch.","what":"CVE-2021-47302 is a high-severity use after free vulnerability in Linux kernel, 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-2021-47302 and fix it if it is affected.\n\nWhat it is: CVE-2021-47302 is a high-severity use after free vulnerability in Linux kernel, 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-2021-47302 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-2021-47302/ (Markdown: https://insights.sbomify.com/CVE-2021-47302/index.md)","id":"CVE-2021-47302","markdown":"https://insights.sbomify.com/CVE-2021-47302/index.md","name":"CVE-2021-47302","record":{"aliases":["DEBIAN-CVE-2021-47302","GHSA-g595-9cfg-4hxm","UBUNTU-CVE-2021-47302"],"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 driver","requires_auth":"low_privilege","summary":"A use-after-free vulnerability in the Linux kernel igc driver allows attackers to cause a denial of service or potentially execute code during network controller resets.","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":"nvd","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\nigc: Fix use-after-free error during reset\n\nCleans the next descriptor to watch (next_to_watch) when cleaning the\nTX ring.\n\nFailure to do so can cause invalid memory accesses. If igc_poll() runs\nwhile the controller is being reset this can lead to the driver try to\nfree a skb that was already freed.\n\nLog message:\n\n [  101.525242] refcount_t: underflow; use-after-free.\n [  101.525251] WARNING: CPU: 1 PID: 646 at lib/refcount.c:28 refcount_warn_saturate+0xab/0xf0\n [  101.525259] Modules linked in: sch_etf(E) sch_mqprio(E) rfkill(E) intel_rapl_msr(E) intel_rapl_common(E)\n x86_pkg_temp_thermal(E) intel_powerclamp(E) coretemp(E) binfmt_misc(E) kvm_intel(E) kvm(E) irqbypass(E) crc32_pclmul(E)\n ghash_clmulni_intel(E) aesni_intel(E) mei_wdt(E) libaes(E) crypto_simd(E) cryptd(E) glue_helper(E) snd_hda_codec_hdmi(E)\n rapl(E) intel_cstate(E) snd_hda_intel(E) snd_intel_dspcfg(E) sg(E) soundwire_intel(E) intel_uncore(E) at24(E)\n soundwire_generic_allocation(E) iTCO_wdt(E) soundwire_cadence(E) intel_pmc_bxt(E) serio_raw(E) snd_hda_codec(E)\n iTCO_vendor_support(E) watchdog(E) snd_hda_core(E) snd_hwdep(E) snd_soc_core(E) snd_compress(E) snd_pcsp(E)\n soundwire_bus(E) snd_pcm(E) evdev(E) snd_timer(E) mei_me(E) snd(E) soundcore(E) mei(E) configfs(E) ip_tables(E) x_tables(E)\n autofs4(E) ext4(E) crc32c_generic(E) crc16(E) mbcache(E) jbd2(E) sd_mod(E) t10_pi(E) crc_t10dif(E) crct10dif_generic(E)\n i915(E) ahci(E) libahci(E) ehci_pci(E) igb(E) xhci_pci(E) ehci_hcd(E)\n [  101.525303]  drm_kms_helper(E) dca(E) xhci_hcd(E) libata(E) crct10dif_pclmul(E) cec(E) crct10dif_common(E) tsn(E) igc(E)\n e1000e(E) ptp(E) i2c_i801(E) crc32c_intel(E) psmouse(E) i2c_algo_bit(E) i2c_smbus(E) scsi_mod(E) lpc_ich(E) pps_core(E)\n usbcore(E) drm(E) button(E) video(E)\n [  101.525318] CPU: 1 PID: 646 Comm: irq/37-enp7s0-T Tainted: G            E     5.10.30-rt37-tsn1-rt-ipipe #ipipe\n [  101.525320] Hardware name: SIEMENS AG SIMATIC IPC427D/A5E31233588, BIOS V17.02.09 03/31/2017\n [  101.525322] RIP: 0010:refcount_warn_saturate+0xab/0xf0\n [  101.525325] Code: 05 31 48 44 01 01 e8 f0 c6 42 00 0f 0b c3 80 3d 1f 48 44 01 00 75 90 48 c7 c7 78 a8 f3 a6 c6 05 0f 48\n 44 01 01 e8 d1 c6 42 00 \u003c0f\u003e 0b c3 80 3d fe 47 44 01 00 0f 85 6d ff ff ff 48 c7 c7 d0 a8 f3\n [  101.525327] RSP: 0018:ffffbdedc0917cb8 EFLAGS: 00010286\n [  101.525329] RAX: 0000000000000000 RBX: ffff98fd6becbf40 RCX: 0000000000000001\n [  101.525330] RDX: 0000000000000001 RSI: ffffffffa6f2700c RDI: 00000000ffffffff\n [  101.525332] RBP: ffff98fd6becc14c R08: ffffffffa7463d00 R09: ffffbdedc0917c50\n [  101.525333] R10: ffffffffa74c3578 R11: 0000000000000034 R12: 00000000ffffff00\n [  101.525335] R13: ffff98fd6b0b1000 R14: 0000000000000039 R15: ffff98fd6be35c40\n [  101.525337] FS:  0000000000000000(0000) GS:ffff98fd6e240000(0000) knlGS:0000000000000000\n [  101.525339] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n [  101.525341] CR2: 00007f34135a3a70 CR3: 0000000150210003 CR4: 00000000001706e0\n [  101.525343] Call Trace:\n [  101.525346]  sock_wfree+0x9c/0xa0\n [  101.525353]  unix_destruct_scm+0x7b/0xa0\n [  101.525358]  skb_release_head_state+0x40/0x90\n [  101.525362]  skb_release_all+0xe/0x30\n [  101.525364]  napi_consume_skb+0x57/0x160\n [  101.525367]  igc_poll+0xb7/0xc80 [igc]\n [  101.525376]  ? sched_clock+0x5/0x10\n [  101.525381]  ? sched_clock_cpu+0xe/0x100\n [  101.525385]  net_rx_action+0x14c/0x410\n [  101.525388]  __do_softirq+0xe9/0x2f4\n [  101.525391]  __local_bh_enable_ip+0xe3/0x110\n [  101.525395]  ? irq_finalize_oneshot.part.47+0xe0/0xe0\n [  101.525398]  irq_forced_thread_fn+0x6a/0x80\n [  101.525401]  irq_thread+0xe8/0x180\n [  101.525403]  ? wake_threads_waitq+0x30/0x30\n [  101.525406]  ? irq_thread_check_affinity+0xd0/0xd0\n [  101.525408]  kthread+0x183/0x1a0\n [  101.525412]  ? kthread_park+0x80/0x80\n [  101.525415]  ret_from_fork+0x22/0x30","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":"igc: Fix use-after-free error during reset","id":"CVE-2021-47302","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":4,"next":{"headline":"bpf: Track subprog poke descriptors correctly and fix use-after-free","id":"CVE-2021-47303"},"packages":[],"prev":{"headline":"igb: Fix use-after-free error during reset","id":"CVE-2021-47301"},"products":["Linux"],"published":"2024-05-21","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":"2026-05-11","vendors":["Linux"]},"summary":"A use-after-free vulnerability in the Linux kernel igc driver allows attackers to cause a denial of service or potentially execute code during network controller resets.","url":"https://insights.sbomify.com/CVE-2021-47302/"}