{"answers":{"affected":"It affects 1 product.","exploited":"There is no known exploitation of CVE-2021-47468 in the wild and no public exploit code.","fix":"Apply the vendor's patch.","what":"CVE-2021-47468 is a medium-severity denial of service 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-2021-47468 and fix it if it is affected.\n\nWhat it is: CVE-2021-47468 is a medium-severity denial of service 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-2021-47468 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-2021-47468/ (Markdown: https://insights.sbomify.com/CVE-2021-47468/index.md)","id":"CVE-2021-47468","markdown":"https://insights.sbomify.com/CVE-2021-47468/index.md","name":"CVE-2021-47468","record":{"aliases":["DEBIAN-CVE-2021-47468","GHSA-hh73-mjw2-25fw","UBUNTU-CVE-2021-47468"],"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 bug in the Linux kernel mISDN driver causes a sleeping function call in atomic context, potentially leading to a system crash or denial of service.","user_interaction":"not_required","vuln_class":"denial_of_service"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"Linux","cpe":[{"product":"linux_kernel","vendor":"linux"}],"cvss":{"score":5.5,"severity":"medium","source":"nvd","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"cwes":[{"id":"CWE-667","name":"Improper Locking"}],"description":"In the Linux kernel, the following vulnerability has been resolved:\n\nisdn: mISDN: Fix sleeping function called from invalid context\n\nThe driver can call card-\u003eisac.release() function from an atomic\ncontext.\n\nFix this by calling this function after releasing the lock.\n\nThe following log reveals it:\n\n[   44.168226 ] BUG: sleeping function called from invalid context at kernel/workqueue.c:3018\n[   44.168941 ] in_atomic(): 1, irqs_disabled(): 1, non_block: 0, pid: 5475, name: modprobe\n[   44.169574 ] INFO: lockdep is turned off.\n[   44.169899 ] irq event stamp: 0\n[   44.170160 ] hardirqs last  enabled at (0): [\u003c0000000000000000\u003e] 0x0\n[   44.170627 ] hardirqs last disabled at (0): [\u003cffffffff814209ed\u003e] copy_process+0x132d/0x3e00\n[   44.171240 ] softirqs last  enabled at (0): [\u003cffffffff81420a1a\u003e] copy_process+0x135a/0x3e00\n[   44.171852 ] softirqs last disabled at (0): [\u003c0000000000000000\u003e] 0x0\n[   44.172318 ] Preemption disabled at:\n[   44.172320 ] [\u003cffffffffa009b0a9\u003e] nj_release+0x69/0x500 [netjet]\n[   44.174441 ] Call Trace:\n[   44.174630 ]  dump_stack_lvl+0xa8/0xd1\n[   44.174912 ]  dump_stack+0x15/0x17\n[   44.175166 ]  ___might_sleep+0x3a2/0x510\n[   44.175459 ]  ? nj_release+0x69/0x500 [netjet]\n[   44.175791 ]  __might_sleep+0x82/0xe0\n[   44.176063 ]  ? start_flush_work+0x20/0x7b0\n[   44.176375 ]  start_flush_work+0x33/0x7b0\n[   44.176672 ]  ? trace_irq_enable_rcuidle+0x85/0x170\n[   44.177034 ]  ? kasan_quarantine_put+0xaa/0x1f0\n[   44.177372 ]  ? kasan_quarantine_put+0xaa/0x1f0\n[   44.177711 ]  __flush_work+0x11a/0x1a0\n[   44.177991 ]  ? flush_work+0x20/0x20\n[   44.178257 ]  ? lock_release+0x13c/0x8f0\n[   44.178550 ]  ? __kasan_check_write+0x14/0x20\n[   44.178872 ]  ? do_raw_spin_lock+0x148/0x360\n[   44.179187 ]  ? read_lock_is_recursive+0x20/0x20\n[   44.179530 ]  ? __kasan_check_read+0x11/0x20\n[   44.179846 ]  ? do_raw_spin_unlock+0x55/0x900\n[   44.180168 ]  ? ____kasan_slab_free+0x116/0x140\n[   44.180505 ]  ? _raw_spin_unlock_irqrestore+0x41/0x60\n[   44.180878 ]  ? skb_queue_purge+0x1a3/0x1c0\n[   44.181189 ]  ? kfree+0x13e/0x290\n[   44.181438 ]  flush_work+0x17/0x20\n[   44.181695 ]  mISDN_freedchannel+0xe8/0x100\n[   44.182006 ]  isac_release+0x210/0x260 [mISDNipac]\n[   44.182366 ]  nj_release+0xf6/0x500 [netjet]\n[   44.182685 ]  nj_remove+0x48/0x70 [netjet]\n[   44.182989 ]  pci_device_remove+0xa9/0x250","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":"isdn: mISDN: Fix sleeping function called from invalid context","id":"CVE-2021-47468","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":"linux:linux_kernel","products":["linux:linux_kernel"],"type":"denial_of_service","year":"2021"},"n_packages":0,"n_references":8,"next":{"headline":"This CVE ID has been rejected or withdrawn by its CVE Numbering Authority.","id":"CVE-2021-47469"},"packages":[],"prev":{"headline":"kunit: fix reference count leak in kfree_at_end","id":"CVE-2021-47467"},"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 bug in the Linux kernel mISDN driver causes a sleeping function call in atomic context, potentially leading to a system crash or denial of service.","url":"https://insights.sbomify.com/CVE-2021-47468/"}