{"answers":{"affected":"It affects 1 product.","exploited":"There is no known exploitation of CVE-2021-47440 in the wild and no public exploit code.","fix":"Apply the vendor's patch.","what":"CVE-2021-47440 is a low-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-2021-47440 and fix it if it is affected.\n\nWhat it is: CVE-2021-47440 is a low-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-2021-47440 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-2021-47440/ (Markdown: https://insights.sbomify.com/CVE-2021-47440/index.md)","id":"CVE-2021-47440","markdown":"https://insights.sbomify.com/CVE-2021-47440/index.md","name":"CVE-2021-47440","record":{"aliases":["DEBIAN-CVE-2021-47440","GHSA-h8c2-87vw-jwfw","UBUNTU-CVE-2021-47440"],"analysis":{"component_type":"kernel","fix_type":"patch","impacts":["denial_of_service"],"network_reachable":"adjacent_or_local","non_default_config":false,"product_category":"Linux kernel driver","requires_auth":"high_privilege","summary":"A missing error check in the encx24j600 network driver can cause a null pointer dereference, leading to a system crash.","user_interaction":"not_required","vuln_class":"null_dereference"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"Linux","cpe":[{"product":"linux_kernel","vendor":"linux"}],"cvss":{"score":2.3,"severity":"low","source":"cisa-adp","vector":"CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:L","version":"3.1"},"cwes":[{"id":"CWE-476","name":"NULL Pointer Dereference"}],"description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: encx24j600: check error in devm_regmap_init_encx24j600\n\ndevm_regmap_init may return error which caused by like out of memory,\nthis will results in null pointer dereference later when reading\nor writing register:\n\ngeneral protection fault in encx24j600_spi_probe\nKASAN: null-ptr-deref in range [0x0000000000000090-0x0000000000000097]\nCPU: 0 PID: 286 Comm: spi-encx24j600- Not tainted 5.15.0-rc2-00142-g9978db750e31-dirty #11 9c53a778c1306b1b02359f3c2bbedc0222cba652\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.13.0-1ubuntu1.1 04/01/2014\nRIP: 0010:regcache_cache_bypass drivers/base/regmap/regcache.c:540\nCode: 54 41 89 f4 55 53 48 89 fb 48 83 ec 08 e8 26 94 a8 fe 48 8d bb a0 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 \u003c80\u003e 3c 02 00 0f 85 4a 03 00 00 4c 8d ab b0 00 00 00 48 8b ab a0 00\nRSP: 0018:ffffc900010476b8 EFLAGS: 00010207\nRAX: dffffc0000000000 RBX: fffffffffffffff4 RCX: 0000000000000000\nRDX: 0000000000000012 RSI: ffff888002de0000 RDI: 0000000000000094\nRBP: ffff888013c9a000 R08: 0000000000000000 R09: fffffbfff3f9cc6a\nR10: ffffc900010476e8 R11: fffffbfff3f9cc69 R12: 0000000000000001\nR13: 000000000000000a R14: ffff888013c9af54 R15: ffff888013c9ad08\nFS:  00007ffa984ab580(0000) GS:ffff88801fe00000(0000) knlGS:0000000000000000\nCS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\nCR2: 000055a6384136c8 CR3: 000000003bbe6003 CR4: 0000000000770ef0\nDR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\nDR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\nPKRU: 55555554\nCall Trace:\n encx24j600_spi_probe drivers/net/ethernet/microchip/encx24j600.c:459\n spi_probe drivers/spi/spi.c:397\n really_probe drivers/base/dd.c:517\n __driver_probe_device drivers/base/dd.c:751\n driver_probe_device drivers/base/dd.c:782\n __device_attach_driver drivers/base/dd.c:899\n bus_for_each_drv drivers/base/bus.c:427\n __device_attach drivers/base/dd.c:971\n bus_probe_device drivers/base/bus.c:487\n device_add drivers/base/core.c:3364\n __spi_add_device drivers/spi/spi.c:599\n spi_add_device drivers/spi/spi.c:641\n spi_new_device drivers/spi/spi.c:717\n new_device_store+0x18c/0x1f1 [spi_stub 4e02719357f1ff33f5a43d00630982840568e85e]\n dev_attr_store drivers/base/core.c:2074\n sysfs_kf_write fs/sysfs/file.c:139\n kernfs_fop_write_iter fs/kernfs/file.c:300\n new_sync_write fs/read_write.c:508 (discriminator 4)\n vfs_write fs/read_write.c:594\n ksys_write fs/read_write.c:648\n do_syscall_64 arch/x86/entry/common.c:50\n entry_SYSCALL_64_after_hwframe arch/x86/entry/entry_64.S:113\n\nAdd error check in devm_regmap_init_encx24j600 to avoid this situation.","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: encx24j600: check error in devm_regmap_init_encx24j600","id":"CVE-2021-47440","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":"linux:linux_kernel","products":["linux:linux_kernel"],"type":"null_dereference","year":"2021"},"n_packages":0,"n_references":8,"next":{"headline":"mlxsw: thermal: Fix out-of-bounds memory accesses","id":"CVE-2021-47441"},"packages":[],"prev":{"headline":"net: dsa: microchip: Added the condition for scheduling ksz_mib_read_work","id":"CVE-2021-47439"},"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 missing error check in the encx24j600 network driver can cause a null pointer dereference, leading to a system crash.","url":"https://insights.sbomify.com/CVE-2021-47440/"}