CVE-2023-53783 (GCVE-0-2023-53783)

Vulnerability from cvelistv5 – Published: 2025-12-09 00:00 – Updated: 2025-12-20 08:51
VLAI?
Title
blk-iocost: fix divide by 0 error in calc_lcoefs()
Summary
In the Linux kernel, the following vulnerability has been resolved: blk-iocost: fix divide by 0 error in calc_lcoefs() echo max of u64 to cost.model can cause divide by 0 error. # echo 8:0 rbps=18446744073709551615 > /sys/fs/cgroup/io.cost.model divide error: 0000 [#1] PREEMPT SMP RIP: 0010:calc_lcoefs+0x4c/0xc0 Call Trace: <TASK> ioc_refresh_params+0x2b3/0x4f0 ioc_cost_model_write+0x3cb/0x4c0 ? _copy_from_iter+0x6d/0x6c0 ? kernfs_fop_write_iter+0xfc/0x270 cgroup_file_write+0xa0/0x200 kernfs_fop_write_iter+0x17d/0x270 vfs_write+0x414/0x620 ksys_write+0x73/0x160 __x64_sys_write+0x1e/0x30 do_syscall_64+0x35/0x80 entry_SYSCALL_64_after_hwframe+0x63/0xcd calc_lcoefs() uses the input value of cost.model in DIV_ROUND_UP_ULL, overflow would happen if bps plus IOC_PAGE_SIZE is greater than ULLONG_MAX, it can cause divide by 0 error. Fix the problem by setting basecost
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 7caa47151ab2e644dd221f741ec7578d9532c9a3 , < 9e8bf9f95f7a299fa9ea45b678d001806ad5e12c (git)
Affected: 7caa47151ab2e644dd221f741ec7578d9532c9a3 , < 6e291810fe83a384700eb24a1f714966391ed562 (git)
Affected: 7caa47151ab2e644dd221f741ec7578d9532c9a3 , < 3538ade9d8c2ba41088e395de916f2599fadba8f (git)
Affected: 7caa47151ab2e644dd221f741ec7578d9532c9a3 , < bf8eb1fd6110871e6232e8e7efe399276ef7e6f6 (git)
Affected: 7caa47151ab2e644dd221f741ec7578d9532c9a3 , < b96d7b4a9745fbd0c8384608ceb1f50415e862fa (git)
Affected: 7caa47151ab2e644dd221f741ec7578d9532c9a3 , < 984af1e66b4126cf145153661cc24c213e2ec231 (git)
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    Linux Linux Affected: 5.4
Unaffected: 0 , < 5.4 (semver)
Unaffected: 5.4.235 , ≤ 5.4.* (semver)
Unaffected: 5.10.173 , ≤ 5.10.* (semver)
Unaffected: 5.15.99 , ≤ 5.15.* (semver)
Unaffected: 6.1.16 , ≤ 6.1.* (semver)
Unaffected: 6.2.3 , ≤ 6.2.* (semver)
Unaffected: 6.3 , ≤ * (original_commit_for_fix)
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            "block/blk-iocost.c"
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nblk-iocost: fix divide by 0 error in calc_lcoefs()\n\necho max of u64 to cost.model can cause divide by 0 error.\n\n  # echo 8:0 rbps=18446744073709551615 \u003e /sys/fs/cgroup/io.cost.model\n\n  divide error: 0000 [#1] PREEMPT SMP\n  RIP: 0010:calc_lcoefs+0x4c/0xc0\n  Call Trace:\n   \u003cTASK\u003e\n   ioc_refresh_params+0x2b3/0x4f0\n   ioc_cost_model_write+0x3cb/0x4c0\n   ? _copy_from_iter+0x6d/0x6c0\n   ? kernfs_fop_write_iter+0xfc/0x270\n   cgroup_file_write+0xa0/0x200\n   kernfs_fop_write_iter+0x17d/0x270\n   vfs_write+0x414/0x620\n   ksys_write+0x73/0x160\n   __x64_sys_write+0x1e/0x30\n   do_syscall_64+0x35/0x80\n   entry_SYSCALL_64_after_hwframe+0x63/0xcd\n\ncalc_lcoefs() uses the input value of cost.model in DIV_ROUND_UP_ULL,\noverflow would happen if bps plus IOC_PAGE_SIZE is greater than\nULLONG_MAX, it can cause divide by 0 error.\n\nFix the problem by setting basecost"
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        "dateUpdated": "2025-12-20T08:51:19.897Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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    "cveId": "CVE-2023-53783",
    "datePublished": "2025-12-09T00:00:38.679Z",
    "dateReserved": "2025-12-08T23:58:35.272Z",
    "dateUpdated": "2025-12-20T08:51:19.897Z",
    "state": "PUBLISHED"
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  }
}


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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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