{"answers":{"affected":"It affects 1 product.","exploited":"There is no known exploitation of CVE-2025-39946 in the wild and no public exploit code.","fix":"Apply the vendor's patch.","what":"CVE-2025-39946 is a critical vulnerability in Linux kernel, published on 4 Oct 2025. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2025-39946 and fix it if it is affected.\n\nWhat it is: CVE-2025-39946 is a critical vulnerability in Linux kernel, published on 4 Oct 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2025-39946 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-2025-39946/ (Markdown: https://insights.sbomify.com/CVE-2025-39946/index.md)","id":"CVE-2025-39946","markdown":"https://insights.sbomify.com/CVE-2025-39946/index.md","name":"CVE-2025-39946","record":{"aliases":["A-432728472","A-446648770","ASB-A-432728472","ASB-A-446648770","AZL-68141","BELL-CVE-2025-39946","DEBIAN-CVE-2025-39946","GHSA-cgf5-f6fj-4v5q","ROOT-OS-DEBIAN-12-CVE-2025-39946","ROOT-OS-DEBIAN-13-CVE-2025-39946","ROOT-OS-UBUNTU-2404-CVE-2025-39946","UBUNTU-CVE-2025-39946"],"analysis":{"component_type":"kernel","fix_type":"patch","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"Linux kernel TLS","requires_auth":"none","summary":"A flaw in the Linux kernel TLS implementation allows remote attackers to cause a denial of service via crafted network packets that trigger an integer overflow in socket buffer handling.","user_interaction":"not_required","vuln_class":"integer_overflow"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"Linux","cpe":[{"product":"linux_kernel","vendor":"linux"}],"cvss":{"score":9.8,"severity":"critical","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","version":"3.1"},"cwes":[],"description":"In the Linux kernel, the following vulnerability has been resolved:\n\ntls: make sure to abort the stream if headers are bogus\n\nNormally we wait for the socket to buffer up the whole record\nbefore we service it. If the socket has a tiny buffer, however,\nwe read out the data sooner, to prevent connection stalls.\nMake sure that we abort the connection when we find out late\nthat the record is actually invalid. Retrying the parsing is\nfine in itself but since we copy some more data each time\nbefore we parse we can overflow the allocated skb space.\n\nConstructing a scenario in which we're under pressure without\nenough data in the socket to parse the length upfront is quite\nhard. syzbot figured out a way to do this by serving us the header\nin small OOB sends, and then filling in the recvbuf with a large\nnormal send.\n\nMake sure that tls_rx_msg_size() aborts strp, if we reach\nan invalid record there's really no way to recover.","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":"2025-10-04","github_poc":1,"max_poc_stars":37,"metasploit":0,"nuclei":0,"refs":[{"date":"2025-10-04T19:39:03Z","kind":"github_poc","ref":"https://github.com/farazsth98/exploit-CVE-2025-39946","stars":37,"title":"Exploit for CVE-2025-39946, a bug in the Linux kernel's net/tls subsystem."}],"tier":"poc_unverified"},"has_fix":true,"headline":"tls: make sure to abort the stream if headers are bogus","id":"CVE-2025-39946","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":"linux:linux_kernel","products":["linux:linux_kernel"],"type":"integer_overflow","year":"2025"},"n_packages":0,"n_references":5,"next":{"headline":"net/mlx5e: Harden uplink netdev access against device unbind","id":"CVE-2025-39947"},"packages":[],"prev":{"headline":"cnic: Fix use-after-free bugs in cnic_delete_task","id":"CVE-2025-39945"},"products":["Linux"],"published":"2025-10-04","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":"FIRST CVSS licence","name":"CVSS (FIRST)"},{"class":"open","licence":"CC0","name":"PoC-in-GitHub"}],"ssvc":{"automatable":"yes","exploitation":"none","technical_impact":"total"},"state":"PUBLISHED","updated":"2026-08-05","vendors":["Linux"]},"summary":"A flaw in the Linux kernel TLS implementation allows remote attackers to cause a denial of service via crafted network packets that trigger an integer overflow in socket buffer handling.","url":"https://insights.sbomify.com/CVE-2025-39946/"}