{"answers":{"affected":"It affects 1 product.","exploited":"There is no known exploitation of CVE-2021-47599 in the wild and no public exploit code.","fix":"Apply the vendor's patch.","what":"CVE-2021-47599 is a medium-severity 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-2021-47599 and fix it if it is affected.\n\nWhat it is: CVE-2021-47599 is a medium-severity 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-2021-47599 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-2021-47599/ (Markdown: https://insights.sbomify.com/CVE-2021-47599/index.md)","id":"CVE-2021-47599","markdown":"https://insights.sbomify.com/CVE-2021-47599/index.md","name":"CVE-2021-47599","record":{"aliases":["DEBIAN-CVE-2021-47599","GHSA-v8rf-qj3w-fq5c","ROOT-OS-DEBIAN-11-CVE-2021-47599","UBUNTU-CVE-2021-47599"],"analysis":{"component_type":"kernel","fix_type":"patch","impacts":["denial_of_service"],"network_reachable":"adjacent_or_local","non_default_config":false,"product_category":"Linux kernel","requires_auth":"low_privilege","summary":"A race condition in the Linux kernel Btrfs filesystem can cause a kernel warning and potential denial of service when reading mount information.","user_interaction":"not_required","vuln_class":"race_condition"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"Linux","cpe":[{"product":"linux_kernel","vendor":"linux"}],"cvss":{"score":4.7,"severity":"medium","source":"nvd","vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"cwes":[{"id":"CWE-362","name":"Concurrent Execution using Shared Resource with Improper Synchronization"}],"description":"In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: use latest_dev in btrfs_show_devname\n\nThe test case btrfs/238 reports the warning below:\n\n WARNING: CPU: 3 PID: 481 at fs/btrfs/super.c:2509 btrfs_show_devname+0x104/0x1e8 [btrfs]\n CPU: 2 PID: 1 Comm: systemd Tainted: G        W  O 5.14.0-rc1-custom #72\n Hardware name: QEMU QEMU Virtual Machine, BIOS 0.0.0 02/06/2015\n Call trace:\n   btrfs_show_devname+0x108/0x1b4 [btrfs]\n   show_mountinfo+0x234/0x2c4\n   m_show+0x28/0x34\n   seq_read_iter+0x12c/0x3c4\n   vfs_read+0x29c/0x2c8\n   ksys_read+0x80/0xec\n   __arm64_sys_read+0x28/0x34\n   invoke_syscall+0x50/0xf8\n   do_el0_svc+0x88/0x138\n   el0_svc+0x2c/0x8c\n   el0t_64_sync_handler+0x84/0xe4\n   el0t_64_sync+0x198/0x19c\n\nReason:\nWhile btrfs_prepare_sprout() moves the fs_devices::devices into\nfs_devices::seed_list, the btrfs_show_devname() searches for the devices\nand found none, leading to the warning as in above.\n\nFix:\nlatest_dev is updated according to the changes to the device list.\nThat means we could use the latest_dev-\u003ename to show the device name in\n/proc/self/mounts, the pointer will be always valid as it's assigned\nbefore the device is deleted from the list in remove or replace.\nThe RCU protection is sufficient as the device structure is freed after\nsynchronization.","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":"btrfs: use latest_dev in btrfs_show_devname","id":"CVE-2021-47599","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":"linux:linux_kernel","products":["linux:linux_kernel"],"type":"race_condition","year":"2021"},"n_packages":0,"n_references":2,"next":{"headline":"dm btree remove: fix use after free in rebalance_children()","id":"CVE-2021-47600"},"packages":[],"prev":{"headline":"sch_cake: do not call cake_destroy() from cake_init()","id":"CVE-2021-47598"},"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":"2026-05-23","vendors":["Linux"]},"summary":"A race condition in the Linux kernel Btrfs filesystem can cause a kernel warning and potential denial of service when reading mount information.","url":"https://insights.sbomify.com/CVE-2021-47599/"}