CVE-2023-54242 (GCVE-0-2023-54242)

Vulnerability from cvelistv5 – Published: 2025-12-30 12:11 – Updated: 2026-01-05 11:36
VLAI?
Title
block, bfq: Fix division by zero error on zero wsum
Summary
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
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 76f1df88bbc2f984eb0418cc90de0a8384e63604 , < 1655cfc85250a224b0d9486c8136baeea33b9b5c (git)
Affected: 76f1df88bbc2f984eb0418cc90de0a8384e63604 , < c0346a59d719461248c6dc6f21c9e55ef836b66f (git)
Affected: 76f1df88bbc2f984eb0418cc90de0a8384e63604 , < e53413f8deedf738a6782cc14cc00bd5852ccf18 (git)
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    Linux Linux Affected: 5.17
Unaffected: 0 , < 5.17 (semver)
Unaffected: 6.1.30 , ≤ 6.1.* (semver)
Unaffected: 6.3.4 , ≤ 6.3.* (semver)
Unaffected: 6.4 , ≤ * (original_commit_for_fix)
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "block/bfq-iosched.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "1655cfc85250a224b0d9486c8136baeea33b9b5c",
              "status": "affected",
              "version": "76f1df88bbc2f984eb0418cc90de0a8384e63604",
              "versionType": "git"
            },
            {
              "lessThan": "c0346a59d719461248c6dc6f21c9e55ef836b66f",
              "status": "affected",
              "version": "76f1df88bbc2f984eb0418cc90de0a8384e63604",
              "versionType": "git"
            },
            {
              "lessThan": "e53413f8deedf738a6782cc14cc00bd5852ccf18",
              "status": "affected",
              "version": "76f1df88bbc2f984eb0418cc90de0a8384e63604",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "block/bfq-iosched.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.17"
            },
            {
              "lessThan": "5.17",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.30",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.3.*",
              "status": "unaffected",
              "version": "6.3.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.4",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.30",
                  "versionStartIncluding": "5.17",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.3.4",
                  "versionStartIncluding": "5.17",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.4",
                  "versionStartIncluding": "5.17",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "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 \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"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-01-05T11:36:58.701Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/1655cfc85250a224b0d9486c8136baeea33b9b5c"
        },
        {
          "url": "https://git.kernel.org/stable/c/c0346a59d719461248c6dc6f21c9e55ef836b66f"
        },
        {
          "url": "https://git.kernel.org/stable/c/e53413f8deedf738a6782cc14cc00bd5852ccf18"
        }
      ],
      "title": "block, bfq: Fix division by zero error on zero wsum",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2023-54242",
    "datePublished": "2025-12-30T12:11:30.503Z",
    "dateReserved": "2025-12-30T12:06:44.510Z",
    "dateUpdated": "2026-01-05T11:36:58.701Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2023-54242\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-12-30T13:16:12.770\",\"lastModified\":\"2025-12-31T20:42:43.210\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"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 \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\"}],\"metrics\":{},\"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\"}]}}"
  }
}


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Sightings

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Nomenclature

  • 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.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.