{"answers":{"affected":"It affects 1 product.","exploited":"There is no known exploitation of CVE-2021-47561 in the wild and no public exploit code.","fix":"Apply the vendor's patch.","what":"CVE-2021-47561 is a high-severity use after free vulnerability in Linux kernel, published on 24 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-2021-47561 and fix it if it is affected.\n\nWhat it is: CVE-2021-47561 is a high-severity use after free vulnerability in Linux kernel, published on 24 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-2021-47561 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-2021-47561/ (Markdown: https://insights.sbomify.com/CVE-2021-47561/index.md)","id":"CVE-2021-47561","markdown":"https://insights.sbomify.com/CVE-2021-47561/index.md","name":"CVE-2021-47561","record":{"aliases":["DEBIAN-CVE-2021-47561","UBUNTU-CVE-2021-47561"],"analysis":{"component_type":"kernel","fix_type":"patch","impacts":["code_execution","denial_of_service"],"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 virtio I2C driver allows attackers to cause memory corruption or denial of service via timeout handling.","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\ni2c: virtio: disable timeout handling\n\nIf a timeout is hit, it can result is incorrect data on the I2C bus\nand/or memory corruptions in the guest since the device can still be\noperating on the buffers it was given while the guest has freed them.\n\nHere is, for example, the start of a slub_debug splat which was\ntriggered on the next transfer after one transfer was forced to timeout\nby setting a breakpoint in the backend (rust-vmm/vhost-device):\n\n BUG kmalloc-1k (Not tainted): Poison overwritten\n First byte 0x1 instead of 0x6b\n Allocated in virtio_i2c_xfer+0x65/0x35c age=350 cpu=0 pid=29\n \t__kmalloc+0xc2/0x1c9\n \tvirtio_i2c_xfer+0x65/0x35c\n \t__i2c_transfer+0x429/0x57d\n \ti2c_transfer+0x115/0x134\n \ti2cdev_ioctl_rdwr+0x16a/0x1de\n \ti2cdev_ioctl+0x247/0x2ed\n \tvfs_ioctl+0x21/0x30\n \tsys_ioctl+0xb18/0xb41\n Freed in virtio_i2c_xfer+0x32e/0x35c age=244 cpu=0 pid=29\n \tkfree+0x1bd/0x1cc\n \tvirtio_i2c_xfer+0x32e/0x35c\n \t__i2c_transfer+0x429/0x57d\n \ti2c_transfer+0x115/0x134\n \ti2cdev_ioctl_rdwr+0x16a/0x1de\n \ti2cdev_ioctl+0x247/0x2ed\n \tvfs_ioctl+0x21/0x30\n \tsys_ioctl+0xb18/0xb41\n\nThere is no simple fix for this (the driver would have to always create\nbounce buffers and hold on to them until the device eventually returns\nthe buffers), so just disable the timeout support for now.","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":"i2c: virtio: disable timeout handling","id":"CVE-2021-47561","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":2,"next":{"headline":"ice: fix vsi-\u003etxq_map sizing","id":"CVE-2021-47562"},"packages":[],"prev":{"headline":"mlxsw: spectrum: Protect driver from buggy firmware","id":"CVE-2021-47560"},"products":["Linux"],"published":"2024-05-24","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 virtio I2C driver allows attackers to cause memory corruption or denial of service via timeout handling.","url":"https://insights.sbomify.com/CVE-2021-47561/"}