{"answers":{"affected":"","exploited":"There is no known exploitation of CVE-2026-80852 in the wild and no public exploit code.","fix":"Apply the vendor's patch.","what":"CVE-2026-80852 is a memory corruption vulnerability in Linux, published on 4 Sep 2026. 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-2026-80852 and fix it if it is affected.\n\nWhat it is: CVE-2026-80852 is a memory corruption vulnerability in Linux, published on 4 Sep 2026. 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-2026-80852 in the wild and no public exploit code.\n\nAffected product: 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-2026-80852/ (Markdown: https://insights.sbomify.com/CVE-2026-80852/index.md)","id":"CVE-2026-80852","markdown":"https://insights.sbomify.com/CVE-2026-80852/index.md","name":"CVE-2026-80852","record":{"aliases":["AZL-99542","BELL-CVE-2026-80852","DEBIAN-CVE-2026-80852","GHSA-3586-6wjw-9g84","UBUNTU-CVE-2026-80852"],"analysis":{"component_type":"kernel","fix_type":"patch","impacts":["code_execution","privilege_escalation"],"network_reachable":"adjacent_or_local","non_default_config":true,"product_category":"Linux kernel TLS","requires_auth":"low_privilege","summary":"A local attacker with low privileges can trigger an out-of-bounds write in the Linux kernel TLS offload path, potentially leading to code execution or privilege escalation.","user_interaction":"not_required","vuln_class":"memory_corruption"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"Linux","cpe":[],"cvss":{"score":null,"severity":null,"source":null,"vector":null,"version":null},"cwes":[],"description":"In the Linux kernel, the following vulnerability has been resolved:\n\ntls: device: fix out-of-bounds write in tls_append_frag()\n\nFound with syzkaller and a local syzbot instance running on top of a\nnetdevsim TLS offload emulation; tls_device.c is otherwise only reachable\non a machine with a NIC that implements the offload.\n\ntls_push_data() only checks whether the open record still has room for\nanother frag at the bottom of its loop, and the MSG_MORE early break\nskips that check.  The record survives to the next syscall with the frag\ncount it already had, and tls_append_frag() does not check either, so\nwith TLS_TX_ZEROCOPY_RO every splice(SPLICE_F_MORE) of a byte or two adds\na non-coalescing pipe page and num_frags walks off the end of\ntls_record_info.frags[MAX_SKB_FRAGS].  Once the record is pushed,\ntls_push_record() runs the same index over sg_tx_data[MAX_SKB_FRAGS] and\nthe sg_set_page() writes land on the destruct_work that follows it, which\nthe workqueue then calls.\n\nThe byte limit is fine because copy drops to 0 and the loop falls through\nto the same check; the frag count has no such feedback.\n\nPush the record rather than keep a full one open, which is what a plain\nTCP socket does - tcp_sendmsg_locked() uses tcp_mark_push() and\nnew_segment in both the copy and the MSG_SPLICE_PAGES paths, and tls_sw\nalready sets full_record when the sk_msg ring fills up, MSG_MORE or not.\n\n  BUG: KASAN: slab-out-of-bounds in tls_append_frag ( net/tls/tls_device.c:269)\n  Write of size 8 at addr ffff8881104d1530 by task tls_oob/450\n\n  CPU: 2 UID: 0 PID: 450 Comm: tls_oob Not tainted 7.2.0-rc7+ #329 PREEMPT\n  Call Trace:\n   \u003cTASK\u003e\n   dump_stack_lvl (lib/dump_stack.c:94 lib/dump_stack.c:120)\n   print_report (mm/kasan/report.c:378 mm/kasan/report.c:482)\n   kasan_report (mm/kasan/report.c:595)\n   tls_append_frag (net/tls/tls_device.c:269)\n   tls_push_data (net/tls/tls_device.c:518)\n   tls_device_sendmsg (net/tls/tls_device.c:583)\n   inet_sendmsg (net/ipv4/af_inet.c:865)\n   sock_sendmsg (net/socket.c:775 net/socket.c:790 net/socket.c:813)\n   splice_to_socket (fs/splice.c:884)\n   do_splice (fs/splice.c:936 fs/splice.c:1349)\n   __do_splice (fs/splice.c:1431)\n   __x64_sys_splice (fs/splice.c:1634 fs/splice.c:1616)\n   do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)\n   entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)\n   \u003c/TASK\u003e\n\nand, once the record is pushed:\n\n  UBSAN: array-index-out-of-bounds in net/tls/tls_device.c:300:24\n  index 18 is out of range for type 'skb_frag_t [17]'\n  UBSAN: array-index-out-of-bounds in net/tls/tls_device.c:301:41\n  index 18 is out of range for type 'scatterlist [17]'\n  UBSAN: array-index-out-of-bounds in net/tls/tls_device.c:302:39\n  index 18 is out of range for type 'scatterlist [17]'\n  UBSAN: array-index-out-of-bounds in net/tls/tls_device.c:307:38\n  index 26 is out of range for type 'scatterlist [17]'\n\n  kernel tried to execute NX-protected page - exploit attempt? (uid: 0)\n  BUG: unable to handle page fault for address: ffffea000411a680\n  #PF: supervisor instruction fetch in kernel mode\n  #PF: error_code(0x0011) - permissions violation\n  Oops: Oops: 0011 [#1] SMP KASAN PTI\n  Workqueue: ktls_device_destruct 0xffffea000411a680\n  RIP: 0010:0xffffea000411a680\n  Call Trace:\n   \u003cTASK\u003e\n   worker_thread (kernel/workqueue.c:3405 kernel/workqueue.c:3486)\n   kthread (kernel/kthread.c:436)\n   ret_from_fork (arch/x86/kernel/process.c:158)\n   ret_from_fork_asm (arch/x86/entry/entry_64.S:245)\n   \u003c/TASK\u003e","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":"tls: device: fix out-of-bounds write in tls_append_frag()","id":"CVE-2026-80852","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"memory_corruption","year":"2026"},"n_packages":0,"n_references":7,"next":{"headline":"KVM: SEV: Allocate full pages for {DE,EN}CRYPT ops on SNP-enabled hosts","id":"CVE-2026-80853"},"packages":[],"prev":{"headline":"gtp: serialize PDP context updates","id":"CVE-2026-80851"},"products":["Linux"],"published":"2026-09-04","related":[],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"}],"ssvc":{"automatable":null,"exploitation":null,"technical_impact":null},"state":"PUBLISHED","updated":"2026-10-19","vendors":["Linux"]},"summary":"A local attacker with low privileges can trigger an out-of-bounds write in the Linux kernel TLS offload path, potentially leading to code execution or privilege escalation.","url":"https://insights.sbomify.com/CVE-2026-80852/"}