blk-iocost: fix divide by 0 error in calc_lcoefs() (Linux Linux)
At a glance
- Source
- NVD
- EPSS
- EPSS 0.21 % · percentile 10 ()
- State
- PUBLISHED
- Published
- Updated
- Assigner
- Linux
- NVD status
- Deferred
Description
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
References
- https://git.kernel.org/stable/c/9e8bf9f95f7a299fa9ea45b678d001806ad5e12c
- https://git.kernel.org/stable/c/6e291810fe83a384700eb24a1f714966391ed562
- https://git.kernel.org/stable/c/3538ade9d8c2ba41088e395de916f2599fadba8f
- https://git.kernel.org/stable/c/bf8eb1fd6110871e6232e8e7efe399276ef7e6f6
- https://git.kernel.org/stable/c/b96d7b4a9745fbd0c8384608ceb1f50415e862fa
- https://git.kernel.org/stable/c/984af1e66b4126cf145153661cc24c213e2ec231
European references
- ENISA EUVD · EUVD-2023-60123
- GCVE · GCVE-0-2023-53783
CERT-FR advisories
- CERTFR-2026-AVI-0225 — Multiples vulnérabilités dans le noyau Linux de SUSE · cert.ssi.gouv.fr
- CERTFR-2026-AVI-0170 — Multiples vulnérabilités dans le noyau Linux de SUSE · cert.ssi.gouv.fr
- CERTFR-2026-AVI-0108 — Multiples vulnérabilités dans le noyau Linux de SUSE · cert.ssi.gouv.fr
Affected products
| Product | Versions |
|---|---|
| Linux · Linux | affected 7caa47151ab2e644dd221f741ec7578d9532c9a3 < 9e8bf9f95f7a299fa9ea45b678d001806ad5e12c ; affected 7caa47151ab2e644dd221f741ec7578d9532c9a3 < 6e291810fe83a384700eb24a1f714966391ed562 ; affected 7caa47151ab2e644dd221f741ec7578d9532c9a3 < 3538ade9d8c2ba41088e395de916f2599fadba8f ; affected 7caa47151ab2e644dd221f741ec7578d9532c9a3 < bf8eb1fd6110871e6232e8e7efe399276ef7e6f6 ; affected 7caa47151ab2e644dd221f741ec7578d9532c9a3 < b96d7b4a9745fbd0c8384608ceb1f50415e862fa ; affected 7caa47151ab2e644dd221f741ec7578d9532c9a3 < 984af1e66b4126cf145153661cc24c213e2ec231 |
| Linux · Linux | affected 5.4 ; unaffected 0 < 5.4 ; unaffected 5.4.235 ≤ 5.4.* ; unaffected 5.10.173 ≤ 5.10.* ; unaffected 5.15.99 ≤ 5.15.* ; unaffected 6.1.16 ≤ 6.1.* |
Sources
| Source | Licence |
|---|---|
| CVE List (CVEProject cvelistV5) | CVE Program Terms of Use |
| EPSS (FIRST.org) | FIRST — attribution requested |
| ENISA EUVD | ENISA — reproduction authorised, source acknowledged |
| CERT-FR (ANSSI) | Licence Ouverte / Etalab 2.0 |
| NVD (NIST) via fkie-cad/nvd-json-data-feeds | Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD |