{"answers":{"affected":"It affects 1 product.","exploited":"There is no known exploitation of CVE-2023-53478 in the wild and no public exploit code.","fix":"Apply the vendor's patch.","what":"CVE-2023-53478 is a high-severity use after free vulnerability in Linux kernel, published on 1 Oct 2025. 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-2023-53478 and fix it if it is affected.\n\nWhat it is: CVE-2023-53478 is a high-severity use after free vulnerability in Linux kernel, published on 1 Oct 2025. 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-2023-53478 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-2023-53478/ (Markdown: https://insights.sbomify.com/CVE-2023-53478/index.md)","id":"CVE-2023-53478","markdown":"https://insights.sbomify.com/CVE-2023-53478/index.md","name":"CVE-2023-53478","record":{"aliases":["BELL-CVE-2023-53478","DEBIAN-CVE-2023-53478","GHSA-q32w-2qjp-8m8q","ROOT-OS-UBUNTU-2204-CVE-2023-53478","UBUNTU-CVE-2023-53478"],"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 race condition in the Linux kernel's synthetic tracing allows local attackers to trigger use-after-free or double-free errors, potentially leading to privilege escalation.","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-362","name":"Concurrent Execution using Shared Resource with Improper Synchronization"}],"description":"In the Linux kernel, the following vulnerability has been resolved:\n\ntracing/synthetic: Fix races on freeing last_cmd\n\nCurrently, the \"last_cmd\" variable can be accessed by multiple processes\nasynchronously when multiple users manipulate synthetic_events node\nat the same time, it could lead to use-after-free or double-free.\n\nThis patch add \"lastcmd_mutex\" to prevent \"last_cmd\" from being accessed\nasynchronously.\n\n================================================================\n\nIt's easy to reproduce in the KASAN environment by running the two\nscripts below in different shells.\n\nscript 1:\n        while :\n        do\n                echo -n -e '\\x88' \u003e /sys/kernel/tracing/synthetic_events\n        done\n\nscript 2:\n        while :\n        do\n                echo -n -e '\\xb0' \u003e /sys/kernel/tracing/synthetic_events\n        done\n\n================================================================\ndouble-free scenario:\n\n    process A                       process B\n-------------------               ---------------\n1.kstrdup last_cmd\n                                  2.free last_cmd\n3.free last_cmd(double-free)\n\n================================================================\nuse-after-free scenario:\n\n    process A                       process B\n-------------------               ---------------\n1.kstrdup last_cmd\n                                  2.free last_cmd\n3.tracing_log_err(use-after-free)\n\n================================================================\n\nAppendix 1. KASAN report double-free:\n\nBUG: KASAN: double-free in kfree+0xdc/0x1d4\nFree of addr ***** by task sh/4879\nCall trace:\n        ...\n        kfree+0xdc/0x1d4\n        create_or_delete_synth_event+0x60/0x1e8\n        trace_parse_run_command+0x2bc/0x4b8\n        synth_events_write+0x20/0x30\n        vfs_write+0x200/0x830\n        ...\n\nAllocated by task 4879:\n        ...\n        kstrdup+0x5c/0x98\n        create_or_delete_synth_event+0x6c/0x1e8\n        trace_parse_run_command+0x2bc/0x4b8\n        synth_events_write+0x20/0x30\n        vfs_write+0x200/0x830\n        ...\n\nFreed by task 5464:\n        ...\n        kfree+0xdc/0x1d4\n        create_or_delete_synth_event+0x60/0x1e8\n        trace_parse_run_command+0x2bc/0x4b8\n        synth_events_write+0x20/0x30\n        vfs_write+0x200/0x830\n        ...\n\n================================================================\nAppendix 2. KASAN report use-after-free:\n\nBUG: KASAN: use-after-free in strlen+0x5c/0x7c\nRead of size 1 at addr ***** by task sh/5483\nsh: CPU: 7 PID: 5483 Comm: sh\n        ...\n        __asan_report_load1_noabort+0x34/0x44\n        strlen+0x5c/0x7c\n        tracing_log_err+0x60/0x444\n        create_or_delete_synth_event+0xc4/0x204\n        trace_parse_run_command+0x2bc/0x4b8\n        synth_events_write+0x20/0x30\n        vfs_write+0x200/0x830\n        ...\n\nAllocated by task 5483:\n        ...\n        kstrdup+0x5c/0x98\n        create_or_delete_synth_event+0x80/0x204\n        trace_parse_run_command+0x2bc/0x4b8\n        synth_events_write+0x20/0x30\n        vfs_write+0x200/0x830\n        ...\n\nFreed by task 5480:\n        ...\n        kfree+0xdc/0x1d4\n        create_or_delete_synth_event+0x74/0x204\n        trace_parse_run_command+0x2bc/0x4b8\n        synth_events_write+0x20/0x30\n        vfs_write+0x200/0x830\n        ...","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":"tracing/synthetic: Fix races on freeing last_cmd","id":"CVE-2023-53478","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":"linux:linux_kernel","products":["linux:linux_kernel"],"type":"use_after_free","year":"2023"},"n_packages":0,"n_references":3,"next":{"headline":"cxl/acpi: Fix a use-after-free in cxl_parse_cfmws()","id":"CVE-2023-53479"},"packages":[],"prev":{"headline":"ipv6: Add lwtunnel encap size of all siblings in nexthop calculation","id":"CVE-2023-53477"},"products":["Linux"],"published":"2025-10-01","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":null,"exploitation":null,"technical_impact":null},"state":"PUBLISHED","updated":"2026-08-05","vendors":["Linux"]},"summary":"A race condition in the Linux kernel's synthetic tracing allows local attackers to trigger use-after-free or double-free errors, potentially leading to privilege escalation.","url":"https://insights.sbomify.com/CVE-2023-53478/"}