{"answers":{"affected":"","exploited":"There is no known exploitation of CVE-2026-80817 in the wild and no public exploit code.","fix":"Apply the vendor's patch.","what":"CVE-2026-80817 is a 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-2026-80817 and fix it if it is affected.\n\nWhat it is: CVE-2026-80817 is a 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-2026-80817 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-2026-80817/ (Markdown: https://insights.sbomify.com/CVE-2026-80817/index.md)","id":"CVE-2026-80817","markdown":"https://insights.sbomify.com/CVE-2026-80817/index.md","name":"CVE-2026-80817","record":{"aliases":["BELL-CVE-2026-80817","DEBIAN-CVE-2026-80817","GHSA-wv8m-2pxf-rh83","UBUNTU-CVE-2026-80817"],"analysis":{"component_type":"kernel","fix_type":"patch","impacts":["denial_of_service"],"network_reachable":"adjacent_or_local","non_default_config":false,"product_category":"Linux kernel","requires_auth":"low_privilege","summary":"A race condition in the Linux kernel iommufd subsystem allows a local attacker to trigger a NULL pointer dereference, causing a system crash.","user_interaction":"not_required","vuln_class":"null_dereference"},"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\niommu/iommufd: Fix NULL pointer deref in iommufd_ioas_change_process when racing with iopt_map_file_pages\n\niommufd_ioas_change_process() iterates every IOAS area while only\nholding every IOAS iova_rwsem, so it assumes every area has a non-NULL\npages pointer. That assumption can be false when it runs concurrently\nwith iopt_map_file_pages().\n\niopt_map_pages() executes in two phases. It first creates the area and\ninserts it into the interval tree under iova_rwsem, with area-\u003epages\nstill NULL. It then drops iova_rwsem and later fills area-\u003epages\nunder domains_rwsem. This leaves a window between area creation and\narea-\u003epages fill where a concurrent iommufd_ioas_change_process()\ncan observe the area and dereference a NULL area-\u003epages pointer,\nleading to a NULL pointer dereference:\n\nBUG: kernel NULL pointer dereference, address: 00000000000000c0\n#PF: supervisor read access in kernel mode\n#PF: error_code(0x0000) - not-present page\nPGD 4b655067 P4D 4b655067 PUD 0\nOops: Oops: 0000 [#1] SMP NOPTI\nCPU: 0 UID: 0 PID: 11841 Comm: syz.1.628 Not tainted 7.1.0 #3 PREEMPT(full)\nHardware 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\nRIP: 0010:iommufd_ioas_change_process+0x419/0xd50 drivers/iommu/iommufd/ioas.c:538\nCode: 48 89 c3 48 85 c0 0f 84 cc 00 00 00 e8 10 f5 cb fd 48 8d 7b 68 e8 a7 b5 eb fd 48 8b 6b 68 48 8d bd c0 00 00 00 e8 17 b2 eb fd \u003c8b\u003e ad c0 00 00 00 bf 01 00 00 00 89 ee e8 85 ef cb fd 83 fd 01 74\nRSP: 0018:ffffc90015c17d28 EFLAGS: 00010246\nRAX: ffff8880186d5328 RBX: ffff88801d25e240 RCX: 0000000080000000\nRDX: 00000000000002d7 RSI: ffffffff83ba9e10 RDI: 00000000000000c0\nRBP: 0000000000000000 R08: ffffffff8e781eb8 R09: 0000000000000000\nR10: 00000000000000c0 R11: ffffffff83ba9e29 R12: ffff88802e216008\nR13: ffff88802e216000 R14: 0000000000000001 R15: 0000000000000000\nFS:  00007f4aea3f66c0(0000) GS:ffff8880b1fa1000(0000) knlGS:0000000000000000\nCS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\nCR2: 00000000000000c0 CR3: 000000004b75c000 CR4: 0000000000350ef0\nCall Trace:\n \u003cTASK\u003e\n iommufd_fops_ioctl+0x287/0x400 drivers/iommu/iommufd/main.c:533\n vfs_ioctl fs/ioctl.c:51 [inline]\n __do_sys_ioctl fs/ioctl.c:597 [inline]\n __se_sys_ioctl fs/ioctl.c:583 [inline]\n __x64_sys_ioctl+0x120/0x170 fs/ioctl.c:583\n x64_sys_call+0x1092/0x1fb0 arch/x86/include/generated/asm/syscalls_64.h:17\n do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]\n do_syscall_64+0x10a/0x680 arch/x86/entry/syscall_64.c:94\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\nRIP: 0033:0x7f4aec1a82bd\nCode: ff c3 66 2e 0f 1f 84 00 00 00 00 00 90 f3 0f 1e fa 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 \u003c48\u003e 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48\nRSP: 002b:00007f4aea3f6018 EFLAGS: 00000246 ORIG_RAX: 0000000000000010\nRAX: ffffffffffffffda RBX: 00007f4aec436090 RCX: 00007f4aec1a82bd\nRDX: 0000200000000180 RSI: 0000000000003b92 RDI: 0000000000000003\nRBP: 00007f4aec250295 R08: 0000000000000000 R09: 0000000000000000\nR10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000\nR13: 00007f4aec436128 R14: 00007f4aec436090 R15: 00007ffd04ef23e0\n \u003c/TASK\u003e\nModules linked in:\nCR2: 00000000000000c0\n---[ end trace 0000000000000000 ]---\nRIP: 0010:iommufd_ioas_change_process+0x419/0xd50 drivers/iommu/iommufd/ioas.c:538\nCode: 48 89 c3 48 85 c0 0f 84 cc 00 00 00 e8 10 f5 cb fd 48 8d 7b 68 e8 a7 b5 eb fd 48 8b 6b 68 48 8d bd c0 00 00 00 e8 17 b2 eb fd \u003c8b\u003e ad c0 00 00 00 bf 01 00 00 00 89 ee e8 85 ef cb fd 83 fd 01 74\nRSP: 0018:ffffc90015c17d28 EFLAGS: 00010246\nRAX: ffff8880186d5328 RBX: ffff88801d25e240 RCX: 0000000080000000\nRDX: 00000000000002d7 RSI: ffffffff83ba9e10 RDI: 00000000000000c0\nRBP: 0000000000000000 R08: ffffffff8e781eb8 R09: 0000000000000000\nR10: 00000000000000c0 R11: ffffffff83ba9e29 R12: ffff88802e216008\nR13: ffff88802e216000 R14: 0000000000000001 R15: 0000000000000000\nFS:  00007f4aea3f66c0(000\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":"iommu/iommufd: Fix NULL pointer deref in iommufd_ioas_change_process when racing with iopt_map_file_pages","id":"CVE-2026-80817","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"null_dereference","year":"2026"},"n_packages":0,"n_references":4,"next":{"headline":"iommu/tegra241-cmdqv: Fix CMD_SYNC use-after-free on teardown","id":"CVE-2026-80818"},"packages":[],"prev":{"headline":"ALSA: FCP: Use a private URB for the notification endpoint","id":"CVE-2026-80816"},"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 race condition in the Linux kernel iommufd subsystem allows a local attacker to trigger a NULL pointer dereference, causing a system crash.","url":"https://insights.sbomify.com/CVE-2026-80817/"}