CVE-2023-54242
Estado: AplazadaSin puntuar—
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:
Detalles técnicos trazas, registros y código del informe original
[ 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
CVSS
NVD no ha asignado puntuación CVSS a esta CVE (habitual desde el cambio de política de abril de 2026).
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 0.20%
- Percentil entre todas las CVEs puntuadas: 9
- Fecha de la puntuación: 6/10/2026
EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).
Tecnologías afectadas (1)
⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.
Referencias
JSON original (NVD)
Mostrar
{
"id": "CVE-2023-54242",
"cveTags": [],
"metrics": {},
"affected": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"affectedData": [
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "76f1df88bbc2f984eb0418cc90de0a8384e63604",
"lessThan": "1655cfc85250a224b0d9486c8136baeea33b9b5c",
"versionType": "git"
},
{
"status": "affected",
"version": "76f1df88bbc2f984eb0418cc90de0a8384e63604",
"lessThan": "c0346a59d719461248c6dc6f21c9e55ef836b66f",
"versionType": "git"
},
{
"status": "affected",
"version": "76f1df88bbc2f984eb0418cc90de0a8384e63604",
"lessThan": "e53413f8deedf738a6782cc14cc00bd5852ccf18",
"versionType": "git"
}
],
"programFiles": [
"block/bfq-iosched.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "5.17"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "5.17",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.1.30",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.3.4",
"versionType": "semver",
"lessThanOrEqual": "6.3.*"
},
{
"status": "unaffected",
"version": "6.4",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"block/bfq-iosched.c"
],
"defaultStatus": "affected"
}
]
}
],
"published": "2025-12-30T13:16:12.770",
"references": [
{
"url": "https://git.kernel.org/stable/c/1655cfc85250a224b0d9486c8136baeea33b9b5c",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/c0346a59d719461248c6dc6f21c9e55ef836b66f",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/e53413f8deedf738a6782cc14cc00bd5852ccf18",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
],
"vulnStatus": "Deferred",
"descriptions": [
{
"lang": "en",
"value": "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 <48> 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] <TASK>\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 <48> 3d 00 f0 ff ff 77 48 c3 0f 1f 80 00 00 00 00 48 83 ec 18 89 7c"
},
{
"lang": "es",
"value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nblock, bfq: Corrige el error de división por cero en wsum cero\n\nCuando la suma ponderada es cero, el cálculo del límite causa un error de división por cero. Corrige esto continuando al siguiente nivel.\n\nEsto fue descubierto al ejecutar como root:\n\nstress-ng --ioprio 0\n\nCorrige oops de división por error:\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 <48> 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] \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 <48> 3d 00 f0 ff ff 77 48 c3 0f 1f 80 00 00 00 00 48 83 ec 18 89 7c"
}
],
"lastModified": "2026-06-17T06:47:04.723",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}