{"answers":{"affected":"","exploited":"There is no known exploitation of CVE-2023-54242 in the wild and no public exploit code.","fix":"Apply the vendor's patch.","what":"CVE-2023-54242 is a denial of service vulnerability in Linux, published on 30 Dec 2025. 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-2023-54242 and fix it if it is affected.\n\nWhat it is: CVE-2023-54242 is a denial of service vulnerability in Linux, published on 30 Dec 2025. 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-2023-54242 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-2023-54242/ (Markdown: https://insights.sbomify.com/CVE-2023-54242/index.md)","id":"CVE-2023-54242","markdown":"https://insights.sbomify.com/CVE-2023-54242/index.md","name":"CVE-2023-54242","record":{"aliases":["BELL-CVE-2023-54242","DEBIAN-CVE-2023-54242","GHSA-24q6-h6j8-wpf6","ROOT-OS-UBUNTU-2204-CVE-2023-54242","UBUNTU-CVE-2023-54242"],"analysis":{"component_type":"kernel","fix_type":"patch","impacts":["denial_of_service"],"network_reachable":"adjacent_or_local","non_default_config":true,"product_category":"Linux kernel","requires_auth":"high_privilege","summary":"A local attacker with root privileges can cause a kernel crash via division by zero in the BFQ I/O scheduler when weighted sum is zero.","user_interaction":"not_required","vuln_class":"denial_of_service"},"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\nblock, bfq: Fix division by zero error on zero wsum\n\nWhen the weighted sum is zero the calculation of limit causes\na division by zero error. Fix this by continuing to the next level.\n\nThis was discovered by running as root:\n\nstress-ng --ioprio 0\n\nFixes divison by error oops:\n\n[  521.450556] divide error: 0000 [#1] SMP NOPTI\n[  521.450766] CPU: 2 PID: 2684464 Comm: stress-ng-iopri Not tainted 6.2.1-1280.native #1\n[  521.451117] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.1-0-g3208b098f51a-prebuilt.qemu.org 04/01/2014\n[  521.451627] RIP: 0010:bfqq_request_over_limit+0x207/0x400\n[  521.451875] Code: 01 48 8d 0c c8 74 0b 48 8b 82 98 00 00 00 48 8d 0c c8 8b 85 34 ff ff ff 48 89 ca 41 0f af 41 50 48 d1 ea 48 98 48 01 d0 31 d2 \u003c48\u003e f7 f1 41 39 41 48 89 85 34 ff ff ff 0f 8c 7b 01 00 00 49 8b 44\n[  521.452699] RSP: 0018:ffffb1af84eb3948 EFLAGS: 00010046\n[  521.452938] RAX: 000000000000003c RBX: 0000000000000000 RCX: 0000000000000000\n[  521.453262] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffb1af84eb3978\n[  521.453584] RBP: ffffb1af84eb3a30 R08: 0000000000000001 R09: ffff8f88ab8a4ba0\n[  521.453905] R10: 0000000000000000 R11: 0000000000000001 R12: ffff8f88ab8a4b18\n[  521.454224] R13: ffff8f8699093000 R14: 0000000000000001 R15: ffffb1af84eb3970\n[  521.454549] FS:  00005640b6b0b580(0000) GS:ffff8f88b3880000(0000) knlGS:0000000000000000\n[  521.454912] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n[  521.455170] CR2: 00007ffcbcae4e38 CR3: 00000002e46de001 CR4: 0000000000770ee0\n[  521.455491] PKRU: 55555554\n[  521.455619] Call Trace:\n[  521.455736]  \u003cTASK\u003e\n[  521.455837]  ? bfq_request_merge+0x3a/0xc0\n[  521.456027]  ? elv_merge+0x115/0x140\n[  521.456191]  bfq_limit_depth+0xc8/0x240\n[  521.456366]  __blk_mq_alloc_requests+0x21a/0x2c0\n[  521.456577]  blk_mq_submit_bio+0x23c/0x6c0\n[  521.456766]  __submit_bio+0xb8/0x140\n[  521.457236]  submit_bio_noacct_nocheck+0x212/0x300\n[  521.457748]  submit_bio_noacct+0x1a6/0x580\n[  521.458220]  submit_bio+0x43/0x80\n[  521.458660]  ext4_io_submit+0x23/0x80\n[  521.459116]  ext4_do_writepages+0x40a/0xd00\n[  521.459596]  ext4_writepages+0x65/0x100\n[  521.460050]  do_writepages+0xb7/0x1c0\n[  521.460492]  __filemap_fdatawrite_range+0xa6/0x100\n[  521.460979]  file_write_and_wait_range+0xbf/0x140\n[  521.461452]  ext4_sync_file+0x105/0x340\n[  521.461882]  __x64_sys_fsync+0x67/0x100\n[  521.462305]  ? syscall_exit_to_user_mode+0x2c/0x1c0\n[  521.462768]  do_syscall_64+0x3b/0xc0\n[  521.463165]  entry_SYSCALL_64_after_hwframe+0x5a/0xc4\n[  521.463621] RIP: 0033:0x5640b6c56590\n[  521.464006] Code: 00 f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 80 3d 71 70 0e 00 00 74 17 b8 4a 00 00 00 0f 05 \u003c48\u003e 3d 00 f0 ff ff 77 48 c3 0f 1f 80 00 00 00 00 48 83 ec 18 89 7c","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":"block, bfq: Fix division by zero error on zero wsum","id":"CVE-2023-54242","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"denial_of_service","year":"2023"},"n_packages":0,"n_references":3,"next":{"headline":"netfilter: ebtables: fix table blob use-after-free","id":"CVE-2023-54243"},"packages":[],"prev":{"headline":"MIPS: KVM: Fix NULL pointer dereference","id":"CVE-2023-54241"},"products":["Linux"],"published":"2025-12-30","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":"2026-05-11","vendors":["Linux"]},"summary":"A local attacker with root privileges can cause a kernel crash via division by zero in the BFQ I/O scheduler when weighted sum is zero.","url":"https://insights.sbomify.com/CVE-2023-54242/"}