{"answers":{"affected":"","exploited":"There is no known exploitation of CVE-2026-80981 in the wild and no public exploit code.","fix":"Apply the vendor's patch.","what":"CVE-2026-80981 is a critical use after free vulnerability in Linux, published on 11 Sep 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-2026-80981 and fix it if it is affected.\n\nWhat it is: CVE-2026-80981 is a critical use after free vulnerability in Linux, published on 11 Sep 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-2026-80981 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-2026-80981/ (Markdown: https://insights.sbomify.com/CVE-2026-80981/index.md)","id":"CVE-2026-80981","markdown":"https://insights.sbomify.com/CVE-2026-80981/index.md","name":"CVE-2026-80981","record":{"aliases":["BELL-CVE-2026-80981","DEBIAN-CVE-2026-80981","GHSA-6r37-7pjg-fvjh","UBUNTU-CVE-2026-80981"],"analysis":{"component_type":"kernel","fix_type":"patch","impacts":["code_execution","denial_of_service"],"network_reachable":"yes","non_default_config":true,"product_category":"Linux kernel SMC","requires_auth":"none","summary":"A use-after-free vulnerability in the Linux kernel's SMC protocol allows attackers to trigger memory corruption, potentially leading to code execution or system crashes.","user_interaction":"not_required","vuln_class":"use_after_free"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"Linux","cpe":[],"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\nnet/smc: fix use-after-free of the LLC qentry in smc_llc_srv_add_link()\n\nsmc_llc_srv_add_link() keeps add_llc pointing into the queue entry:\n\n  add_llc = \u0026qentry-\u003emsg.add_link;\t\t\tsmc_llc.c:1482\n  ...\n  smc_llc_save_add_link_info(link_new, add_llc);\tsmc_llc.c:1494\n  smc_llc_flow_qentry_del(\u0026lgr-\u003ellc_flow_lcl);\t\tsmc_llc.c:1495\n  ...\n  u8 *llc_msg = smc_link_shared_v2_rxbuf(link) ?\n\t(u8 *)lgr-\u003ewr_rx_buf_v2 : (u8 *)add_llc;\tsmc_llc.c:1504\n  smc_llc_save_add_link_rkeys(link, link_new, llc_msg);\tsmc_llc.c:1506\n\nsmc_llc_flow_qentry_del() kfree()s the entry, so on a link without a shared\nv2 receive buffer the pointer handed to smc_llc_save_add_link_rkeys() is\nalready freed. Before the Fixes: commit that branch always used\nlgr-\u003ewr_rx_buf_v2 and add_llc was not used after the free.\n\nReproduced on an unpatched tree over rxe, with KASAN, kasan_multi_shot\nand a link forced to max_recv_sge == 1: the entry is freed and read by\nthe same call, and the freeing frame is smc_llc_srv_add_link() itself.\n\n  [    2.523161] BUG: KASAN: slab-use-after-free in smc_llc_save_add_link_rkeys+0x333/0x350\n  [    2.523499] Read of size 2 at addr ffff8880052194de by task kworker/0:1/11\n  [    2.523789]\n  [    2.523862] CPU: 0 UID: 0 PID: 11 Comm: kworker/0:1 Not tainted 7.2.0-rc5-p0-g2c9dd296545d #35 PREEMPT(lazy)\n  [    2.523865] Hardware name: QEMU Ubuntu 24.04 PC v2 (i440FX + PIIX, arch_caps fix, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014\n  [    2.523866] Workqueue: smc_hs_wq smc_listen_work\n  [    2.523869] Call Trace:\n  [    2.523870]  \u003cTASK\u003e\n  [    2.523871]  dump_stack_lvl+0x53/0x70\n  [    2.523872]  print_report+0xd0/0x630\n  [    2.523874]  ? __pfx__raw_spin_lock_irqsave+0x10/0x10\n  [    2.523876]  ? smc_llc_save_add_link_rkeys+0x333/0x350\n  [    2.523878]  kasan_report+0xce/0x100\n  [    2.523879]  ? smc_llc_save_add_link_rkeys+0x333/0x350\n  [    2.523881]  smc_llc_save_add_link_rkeys+0x333/0x350\n  [    2.523883]  ? smcr_buf_reg_lgr+0x2a4/0x660\n  [    2.523885]  smc_llc_srv_add_link+0xaa2/0x1e50\n  [    2.523888]  ? _printk+0xba/0xf0\n  [    2.523897]  ? __pfx_smc_llc_srv_add_link+0x10/0x10\n  [    2.523899]  ? down_write+0xb0/0x130\n  [    2.523903]  ? __pfx_down_write+0x10/0x10\n  [    2.523905]  smc_listen_work+0x489e/0x4d00\n  [    2.523907]  ? kmem_cache_free+0x1c6/0x3a0\n  [    2.523911]  ? __pfx_smc_listen_work+0x10/0x10\n  [    2.523913]  ? release_sock+0x148/0x1d0\n  [    2.523915]  ? smc_tcp_listen_work+0xb4f/0xfc0\n  [    2.523917]  ? _raw_spin_lock_irq+0x80/0xe0\n  [    2.523918]  ? __pfx__raw_spin_lock_irq+0x10/0x10\n  [    2.523920]  process_one_work+0x633/0x1030\n  [    2.523922]  ? assign_work+0x11d/0x370\n  [    2.523924]  worker_thread+0x45b/0xd10\n  [    2.523926]  ? __pfx_worker_thread+0x10/0x10\n  [    2.523928]  ? __pfx_worker_thread+0x10/0x10\n  [    2.523929]  kthread+0x2c6/0x3b0\n  [    2.523931]  ? recalc_sigpending+0x15c/0x1e0\n  [    2.523934]  ? __pfx_kthread+0x10/0x10\n  [    2.523935]  ret_from_fork+0x36e/0x5a0\n  [    2.523937]  ? __pfx_ret_from_fork+0x10/0x10\n  [    2.523938]  ? __switch_to+0x572/0xdd0\n  [    2.523943]  ? __pfx_kthread+0x10/0x10\n  [    2.523944]  ret_from_fork_asm+0x1a/0x30\n  [    2.523947]  \u003c/TASK\u003e\n  [    2.523948]\n  [    2.531253] Allocated by task 48:\n  [    2.531399]  kasan_save_stack+0x33/0x60\n  [    2.531570]  kasan_save_track+0x14/0x30\n  [    2.531737]  __kasan_kmalloc+0x8f/0xa0\n  [    2.531905]  __kmalloc_cache_noprof+0x158/0x370\n  [    2.532100]  smc_llc_enqueue+0x72/0x560\n  [    2.532268]  smc_wr_rx_tasklet_fn+0x474/0xa80\n  [    2.532491]  tasklet_action_common+0x20f/0x8a0\n  [    2.532714]  handle_softirqs+0x18e/0x590\n  [    2.532886]  do_softirq+0x3b/0x60\n  [    2.533036]  __local_bh_enable_ip+0x61/0x70\n  [    2.533221]  __alloc_skb+0x732/0x890\n  [    2.533384]  rxe_init_packet+0x16b/0x4f0\n  [    2.533567]  prepare_ack_packet+0xb8/0x830\n  [    2.533760]  rxe_receiver+0x495/0x96e0\n  [    2.533933]  do_work+0x144/0x470\n  [    2\n---truncated---","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":"net/smc: fix use-after-free of the LLC qentry in smc_llc_srv_add_link()","id":"CVE-2026-80981","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"use_after_free","year":"2026"},"n_packages":0,"n_references":3,"next":{"headline":"net/smc: fix use-after-free in smc_rx_pipe_buf_release()","id":"CVE-2026-80982"},"packages":[],"prev":{"headline":"net/smc: stop killed, freed and out_of_sync sharing a byte","id":"CVE-2026-80980"},"products":["Linux"],"published":"2026-09-11","related":[],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":null,"exploitation":null,"technical_impact":null},"state":"PUBLISHED","updated":"2026-10-19","vendors":["Linux"]},"summary":"A use-after-free vulnerability in the Linux kernel's SMC protocol allows attackers to trigger memory corruption, potentially leading to code execution or system crashes.","url":"https://insights.sbomify.com/CVE-2026-80981/"}