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🛡️ CVE-2023-54242 — kernel

⚪ Unknown ✅ No Known Exploit NVD
N/A
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

block, bfq: Fix division by zero error on zero wsum

In the Linux kernel, the following vulnerability has been resolved:

block, bfq: Fix division by zero error on zero wsum

When the weighted sum is zero the calculation of limit causes

a division by zero error. Fix this by continuing to the next level.

This was discovered by running as root:

stress-ng --ioprio 0

Fixes divison by error oops:

[ 521.450556] divide error: 0000 [#1] SMP NOPTI

[ 521.450766] CPU: 2 PID: 2684464 Comm: stress-ng-iopri Not tainted 6.2.1-1280.native #1

[ 521.451117] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.1-0-g3208b098f51a-prebuilt.qemu.org 04/01/2014

[ 521.451627] RIP: 0010:bfqq_request_over_limit+0x207/0x400

[ 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 <48> f7 f1 41 39 41 48 89 85 34 ff ff ff 0f 8c 7b 01 00 00 49 8b 44

[ 521.452699] RSP: 0018:ffffb1af84eb3948 EFLAGS: 00010046

[ 521.452938] RAX: 000000000000003c RBX: 0000000000000000 RCX: 0000000000000000

[ 521.453262] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffb1af84eb3978

[ 521.453584] RBP: ffffb1af84eb3a30 R08: 0000000000000001 R09: ffff8f88ab8a4ba0

[ 521.453905] R10: 0000000000000000 R11: 0000000000000001 R12: ffff8f88ab8a4b18

[ 521.454224] R13: ffff8f8699093000 R14: 0000000000000001 R15: ffffb1af84eb3970

[ 521.454549] FS: 00005640b6b0b580(0000) GS:ffff8f88b3880000(0000) knlGS:0000000000000000

[ 521.454912] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033

[ 521.455170] CR2: 00007ffcbcae4e38 CR3: 00000002e46de001 CR4: 0000000000770ee0

[ 521.455491] PKRU: 55555554

[ 521.455619] Call Trace:

[ 521.455736] <TASK>

[ 521.455837] ? bfq_request_merge+0x3a/0xc0

[ 521.456027] ? elv_merge+0x115/0x140

[ 521.456191] bfq_limit_depth+0xc8/0x240

[ 521.456366] __blk_mq_alloc_requests+0x21a/0x2c0

[ 521.456577] blk_mq_submit_bio+0x23c/0x6c0

[ 521.456766] __submit_bio+0xb8/0x140

[ 521.457236] submit_bio_noacct_nocheck+0x212/0x300

[ 521.457748] submit_bio_noacct+0x1a6/0x580

[ 521.458220] submit_bio+0x43/0x80

[ 521.458660] ext4_io_submit+0x23/0x80

[ 521.459116] ext4_do_writepages+0x40a/0xd00

[ 521.459596] ext4_writepages+0x65/0x100

[ 521.460050] do_writepages+0xb7/0x1c0

[ 521.460492] __filemap_fdatawrite_range+0xa6/0x100

[ 521.460979] file_write_and_wait_range+0xbf/0x140

[ 521.461452] ext4_sync_file+0x105/0x340

[ 521.461882] __x64_sys_fsync+0x67/0x100

[ 521.462305] ? syscall_exit_to_user_mode+0x2c/0x1c0

[ 521.462768] do_syscall_64+0x3b/0xc0

[ 521.463165] entry_SYSCALL_64_after_hwframe+0x5a/0xc4

[ 521.463621] RIP: 0033:0x5640b6c56590

[ 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 <48> 3d 00 f0 ff ff 77 48 c3 0f 1f 80 00 00 00 00 48 83 ec 18 89 7c

Affected software

CVE-2023-54242 is recorded against 2 packages.

  • kernel (from 6.2.0 up to 6.3.4)
  • unknown

Timeline and source

Published on 30 December 2025 and last revised on 12 August 2026. No public exploit is currently recorded for this entry. Record sourced from NVD.

References

git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
github.com (Advisory)
nvd.nist.gov (Advisory)
git.kernel.org (Package)

CVE-2023-54242 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Details

Severity Unknown
CVSS Score N/A
CVSS Vector N/A
CWE N/A
Public Exploit ✅ No
Source NVD
Published 2025-12-30
Updated 2026-08-20
Modified 2026-08-12
Fix URL N/A

Affected Packages

Software From version Fixed in
kernel 6.2.0 6.3.4
unknown — —

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