{"answers":{"affected":"It affects 2 products.","exploited":"There is no known exploitation of CVE-2025-37959 in the wild and no public exploit code.","fix":"Apply the vendor's patch.","what":"CVE-2025-37959 is a critical vulnerability in Debian Debian Linux, published on 20 May 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-2025-37959 and fix it if it is affected.\n\nWhat it is: CVE-2025-37959 is a critical vulnerability in Debian Debian Linux, published on 20 May 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-2025-37959 in the wild and no public exploit code.\n\nAffected product: Debian Debian Linux. 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-2025-37959/ (Markdown: https://insights.sbomify.com/CVE-2025-37959/index.md)","id":"CVE-2025-37959","markdown":"https://insights.sbomify.com/CVE-2025-37959/index.md","name":"CVE-2025-37959","record":{"aliases":["AZL-72572","BELL-CVE-2025-37959","DEBIAN-CVE-2025-37959","GHSA-g5rc-wjvg-94w5","ROOT-OS-DEBIAN-11-CVE-2025-37959","ROOT-OS-DEBIAN-12-CVE-2025-37959","ROOT-OS-UBUNTU-2204-CVE-2025-37959","ROOT-OS-UBUNTU-2404-CVE-2025-37959","UBUNTU-CVE-2025-37959"],"analysis":{"component_type":"kernel","fix_type":"patch","impacts":["data_read","denial_of_service"],"network_reachable":"yes","non_default_config":true,"product_category":"Linux kernel","requires_auth":"none","summary":"Attackers can leak network namespace data or cause traffic drops via improper packet scrubbing in bpf_redirect_peer, affecting Linux kernel users.","user_interaction":"not_required","vuln_class":"information_disclosure"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"Linux","cpe":[{"product":"debian_linux","vendor":"debian"},{"product":"linux_kernel","vendor":"linux"}],"cvss":{"score":9.4,"severity":"critical","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:H","version":"3.1"},"cwes":[],"description":"In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Scrub packet on bpf_redirect_peer\n\nWhen bpf_redirect_peer is used to redirect packets to a device in\nanother network namespace, the skb isn't scrubbed. That can lead skb\ninformation from one namespace to be \"misused\" in another namespace.\n\nAs one example, this is causing Cilium to drop traffic when using\nbpf_redirect_peer to redirect packets that just went through IPsec\ndecryption to a container namespace. The following pwru trace shows (1)\nthe packet path from the host's XFRM layer to the container's XFRM\nlayer where it's dropped and (2) the number of active skb extensions at\neach function.\n\n    NETNS       MARK  IFACE  TUPLE                                FUNC\n    4026533547  d00   eth0   10.244.3.124:35473-\u003e10.244.2.158:53  xfrm_rcv_cb\n                             .active_extensions = (__u8)2,\n    4026533547  d00   eth0   10.244.3.124:35473-\u003e10.244.2.158:53  xfrm4_rcv_cb\n                             .active_extensions = (__u8)2,\n    4026533547  d00   eth0   10.244.3.124:35473-\u003e10.244.2.158:53  gro_cells_receive\n                             .active_extensions = (__u8)2,\n    [...]\n    4026533547  0     eth0   10.244.3.124:35473-\u003e10.244.2.158:53  skb_do_redirect\n                             .active_extensions = (__u8)2,\n    4026534999  0     eth0   10.244.3.124:35473-\u003e10.244.2.158:53  ip_rcv\n                             .active_extensions = (__u8)2,\n    4026534999  0     eth0   10.244.3.124:35473-\u003e10.244.2.158:53  ip_rcv_core\n                             .active_extensions = (__u8)2,\n    [...]\n    4026534999  0     eth0   10.244.3.124:35473-\u003e10.244.2.158:53  udp_queue_rcv_one_skb\n                             .active_extensions = (__u8)2,\n    4026534999  0     eth0   10.244.3.124:35473-\u003e10.244.2.158:53  __xfrm_policy_check\n                             .active_extensions = (__u8)2,\n    4026534999  0     eth0   10.244.3.124:35473-\u003e10.244.2.158:53  __xfrm_decode_session\n                             .active_extensions = (__u8)2,\n    4026534999  0     eth0   10.244.3.124:35473-\u003e10.244.2.158:53  security_xfrm_decode_session\n                             .active_extensions = (__u8)2,\n    4026534999  0     eth0   10.244.3.124:35473-\u003e10.244.2.158:53  kfree_skb_reason(SKB_DROP_REASON_XFRM_POLICY)\n                             .active_extensions = (__u8)2,\n\nIn this case, there are no XFRM policies in the container's network\nnamespace so the drop is unexpected. When we decrypt the IPsec packet,\nthe XFRM state used for decryption is set in the skb extensions. This\ninformation is preserved across the netns switch. When we reach the\nXFRM policy check in the container's netns, __xfrm_policy_check drops\nthe packet with LINUX_MIB_XFRMINNOPOLS because a (container-side) XFRM\npolicy can't be found that matches the (host-side) XFRM state used for\ndecryption.\n\nThis patch fixes this by scrubbing the packet when using\nbpf_redirect_peer, as is done on typical netns switches via veth\ndevices except skb-\u003emark and skb-\u003etstamp are not zeroed.","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":"bpf: Scrub packet on bpf_redirect_peer","id":"CVE-2025-37959","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":"debian:debian_linux","products":["debian:debian_linux","linux:linux_kernel"],"type":"information_disclosure","year":"2025"},"n_packages":0,"n_references":5,"next":{"headline":"memblock: Accept allocated memory before use in memblock_double_array()","id":"CVE-2025-37960"},"packages":[],"prev":{"headline":"mm/huge_memory: fix dereferencing invalid pmd migration entry","id":"CVE-2025-37958"},"products":["Linux"],"published":"2025-05-20","related":[{"cvss_score":10,"headline":"ProFTPD Improper Access Control","id":"CVE-2015-3306","kev_date_added":"2026-10-08","published":"2015-05-18"},{"cvss_score":9.9,"headline":"RoundCube Webmail Deserialization of Untrusted Data","id":"CVE-2025-49113","kev_date_added":"2026-02-20","published":"2025-06-02"},{"cvss_score":9.8,"headline":"GNU InetUtils Argument Injection","id":"CVE-2026-24061","kev_date_added":"2026-01-26","published":"2026-01-21"},{"cvss_score":9.8,"headline":"Linux Kernel Improper Check for Unusual or Exceptional Conditions","id":"CVE-2025-39682","kev_date_added":"2026-09-18","published":"2025-09-05"},{"cvss_score":9.8,"headline":"Mozilla Firefox Use-After-Free","id":"CVE-2024-9680","kev_date_added":"2024-10-15","published":"2024-10-09"},{"cvss_score":9.8,"headline":"RARLAB UnRAR Directory Traversal","id":"CVE-2022-30333","kev_date_added":"2022-08-09","published":"2022-05-09"},{"cvss_score":9.8,"headline":"Roundcube Webmail SQL Injection","id":"CVE-2021-44026","kev_date_added":"2023-06-22","published":"2021-11-19"}],"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)"}],"ssvc":{"automatable":"yes","exploitation":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-10-15","vendors":["Linux"]},"summary":"Attackers can leak network namespace data or cause traffic drops via improper packet scrubbing in bpf_redirect_peer, affecting Linux kernel users.","url":"https://insights.sbomify.com/CVE-2025-37959/"}