{"answers":{"affected":"It affects 1 product.","exploited":"There is no known exploitation of CVE-2021-47497 in the wild and no public exploit code.","fix":"Apply the vendor's patch.","what":"CVE-2021-47497 is a high-severity vulnerability in Linux kernel, published on 22 May 2024. 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-2021-47497 and fix it if it is affected.\n\nWhat it is: CVE-2021-47497 is a high-severity vulnerability in Linux kernel, published on 22 May 2024. 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-2021-47497 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-2021-47497/ (Markdown: https://insights.sbomify.com/CVE-2021-47497/index.md)","id":"CVE-2021-47497","markdown":"https://insights.sbomify.com/CVE-2021-47497/index.md","name":"CVE-2021-47497","record":{"aliases":["DEBIAN-CVE-2021-47497","GHSA-vgjx-6ccw-c3f6","UBUNTU-CVE-2021-47497"],"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 shift-out-of-bounds error in the Linux kernel nvmem driver can cause a crash when reading specific byte-sized cells.","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":7.8,"severity":"high","source":"nvd","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","version":"3.1"},"cwes":[{"id":"CWE-787","name":"Out-of-bounds Write"}],"description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnvmem: Fix shift-out-of-bound (UBSAN) with byte size cells\n\nIf a cell has 'nbits' equal to a multiple of BITS_PER_BYTE the logic\n\n *p \u0026= GENMASK((cell-\u003enbits%BITS_PER_BYTE) - 1, 0);\n\nwill become undefined behavior because nbits modulo BITS_PER_BYTE is 0, and we\nsubtract one from that making a large number that is then shifted more than the\nnumber of bits that fit into an unsigned long.\n\nUBSAN reports this problem:\n\n UBSAN: shift-out-of-bounds in drivers/nvmem/core.c:1386:8\n shift exponent 64 is too large for 64-bit type 'unsigned long'\n CPU: 6 PID: 7 Comm: kworker/u16:0 Not tainted 5.15.0-rc3+ #9\n Hardware name: Google Lazor (rev3+) with KB Backlight (DT)\n Workqueue: events_unbound deferred_probe_work_func\n Call trace:\n  dump_backtrace+0x0/0x170\n  show_stack+0x24/0x30\n  dump_stack_lvl+0x64/0x7c\n  dump_stack+0x18/0x38\n  ubsan_epilogue+0x10/0x54\n  __ubsan_handle_shift_out_of_bounds+0x180/0x194\n  __nvmem_cell_read+0x1ec/0x21c\n  nvmem_cell_read+0x58/0x94\n  nvmem_cell_read_variable_common+0x4c/0xb0\n  nvmem_cell_read_variable_le_u32+0x40/0x100\n  a6xx_gpu_init+0x170/0x2f4\n  adreno_bind+0x174/0x284\n  component_bind_all+0xf0/0x264\n  msm_drm_bind+0x1d8/0x7a0\n  try_to_bring_up_master+0x164/0x1ac\n  __component_add+0xbc/0x13c\n  component_add+0x20/0x2c\n  dp_display_probe+0x340/0x384\n  platform_probe+0xc0/0x100\n  really_probe+0x110/0x304\n  __driver_probe_device+0xb8/0x120\n  driver_probe_device+0x4c/0xfc\n  __device_attach_driver+0xb0/0x128\n  bus_for_each_drv+0x90/0xdc\n  __device_attach+0xc8/0x174\n  device_initial_probe+0x20/0x2c\n  bus_probe_device+0x40/0xa4\n  deferred_probe_work_func+0x7c/0xb8\n  process_one_work+0x128/0x21c\n  process_scheduled_works+0x40/0x54\n  worker_thread+0x1ec/0x2a8\n  kthread+0x138/0x158\n  ret_from_fork+0x10/0x20\n\nFix it by making sure there are any bits to mask out.","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":"nvmem: Fix shift-out-of-bound (UBSAN) with byte size cells","id":"CVE-2021-47497","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":"linux:linux_kernel","products":["linux:linux_kernel"],"type":"integer_overflow","year":"2021"},"n_packages":0,"n_references":8,"next":{"headline":"dm rq: don't queue request to blk-mq during DM suspend","id":"CVE-2021-47498"},"packages":[],"prev":{"headline":"net/tls: Fix flipped sign in tls_err_abort() calls","id":"CVE-2021-47496"},"products":["Linux"],"published":"2024-05-22","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":"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":"2026-05-11","vendors":["Linux"]},"summary":"A shift-out-of-bounds error in the Linux kernel nvmem driver can cause a crash when reading specific byte-sized cells.","url":"https://insights.sbomify.com/CVE-2021-47497/"}