Vulnerability-Lookup

FKIE_CVE-2026-45898

Vulnerability from fkie_nvd - Published: 2026-05-27 14:17 - Updated: 2026-05-27 14:48

Severity

Summary

In the Linux kernel, the following vulnerability has been resolved: RDMA/iwcm: Fix workqueue list corruption by removing work_list The commit e1168f0 ("RDMA/iwcm: Simplify cm_event_handler()") changed the work submission logic to unconditionally call queue_work() with the expectation that queue_work() would have no effect if work was already pending. The problem is that a free list of struct iwcm_work is used (for which struct work_struct is embedded), so each call to queue_work() is basically unique and therefore does indeed queue the work. This causes a problem in the work handler which walks the work_list until it's empty to process entries. This means that a single run of the work handler could process item N+1 and release it back to the free list while the actual workqueue entry is still queued. It could then get reused (INIT_WORK...) and lead to list corruption in the workqueue logic. Fix this by just removing the work_list. The workqueue already does this for us. This fixes the following error that was observed when stress testing with ucmatose on an Intel E830 in iWARP mode: [ 151.465780] list_del corruption. next->prev should be ffff9f0915c69c08, but was ffff9f0a1116be08. (next=ffff9f0a15b11c08) [ 151.466639] ------------[ cut here ]------------ [ 151.466986] kernel BUG at lib/list_debug.c:67! [ 151.467349] Oops: invalid opcode: 0000 [#1] SMP NOPTI [ 151.467753] CPU: 14 UID: 0 PID: 2306 Comm: kworker/u64:18 Not tainted 6.19.0-rc4+ #1 PREEMPT(voluntary) [ 151.468466] Hardware name: QEMU Ubuntu 24.04 PC (i440FX + PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 151.469192] Workqueue: 0x0 (iw_cm_wq) [ 151.469478] RIP: 0010:__list_del_entry_valid_or_report+0xf0/0x100 [ 151.469942] Code: c7 58 5f 4c b2 e8 10 50 aa ff 0f 0b 48 89 ef e8 36 57 cb ff 48 8b 55 08 48 89 e9 48 89 de 48 c7 c7 a8 5f 4c b2 e8 f0 4f aa ff <0f> 0b 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 90 90 90 90 90 90 [ 151.471323] RSP: 0000:ffffb15644e7bd68 EFLAGS: 00010046 [ 151.471712] RAX: 000000000000006d RBX: ffff9f0915c69c08 RCX: 0000000000000027 [ 151.472243] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff9f0a37d9c600 [ 151.472768] RBP: ffff9f0a15b11c08 R08: 0000000000000000 R09: c0000000ffff7fff [ 151.473294] R10: 0000000000000001 R11: ffffb15644e7bba8 R12: ffff9f092339ee68 [ 151.473817] R13: ffff9f0900059c28 R14: ffff9f092339ee78 R15: 0000000000000000 [ 151.474344] FS: 0000000000000000(0000) GS:ffff9f0a847b5000(0000) knlGS:0000000000000000 [ 151.474934] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 151.475362] CR2: 0000559e233a9088 CR3: 000000020296b004 CR4: 0000000000770ef0 [ 151.475895] PKRU: 55555554 [ 151.476118] Call Trace: [ 151.476331] <TASK> [ 151.476497] move_linked_works+0x49/0xa0 [ 151.476792] __pwq_activate_work.isra.46+0x2f/0xa0 [ 151.477151] pwq_dec_nr_in_flight+0x1e0/0x2f0 [ 151.477479] process_scheduled_works+0x1c8/0x410 [ 151.477823] worker_thread+0x125/0x260 [ 151.478108] ? __pfx_worker_thread+0x10/0x10 [ 151.478430] kthread+0xfe/0x240 [ 151.478671] ? __pfx_kthread+0x10/0x10 [ 151.478955] ? __pfx_kthread+0x10/0x10 [ 151.479240] ret_from_fork+0x208/0x270 [ 151.479523] ? __pfx_kthread+0x10/0x10 [ 151.479806] ret_from_fork_asm+0x1a/0x30 [ 151.480103] </TASK>

References

	URL	Tags
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/38c5b49fffa1b760959af74f11806eeb3ef4706d
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/7874eeacfa42177565c01d5198726671acf7adf2
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/a6b9e793e74e372daa266fd0d58b751305877897
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/eb715133e0ae12514bba4d2d5ce1dee774476056

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/iwcm: Fix workqueue list corruption by removing work_list\n\nThe commit e1168f0 (\"RDMA/iwcm: Simplify cm_event_handler()\")\nchanged the work submission logic to unconditionally call\nqueue_work() with the expectation that queue_work() would\nhave no effect if work was already pending. The problem is\nthat a free list of struct iwcm_work is used (for which\nstruct work_struct is embedded), so each call to queue_work()\nis basically unique and therefore does indeed queue the work.\n\nThis causes a problem in the work handler which walks the work_list\nuntil it\u0027s empty to process entries. This means that a single\nrun of the work handler could process item N+1 and release it\nback to the free list while the actual workqueue entry is still\nqueued. It could then get reused (INIT_WORK...) and lead to\nlist corruption in the workqueue logic.\n\nFix this by just removing the work_list. The workqueue already\ndoes this for us.\n\nThis fixes the following error that was observed when stress\ntesting with ucmatose on an Intel E830 in iWARP mode:\n\n[  151.465780] list_del corruption. next-\u003eprev should be ffff9f0915c69c08, but was ffff9f0a1116be08. (next=ffff9f0a15b11c08)\n[  151.466639] ------------[ cut here ]------------\n[  151.466986] kernel BUG at lib/list_debug.c:67!\n[  151.467349] Oops: invalid opcode: 0000 [#1] SMP NOPTI\n[  151.467753] CPU: 14 UID: 0 PID: 2306 Comm: kworker/u64:18 Not tainted 6.19.0-rc4+ #1 PREEMPT(voluntary)\n[  151.468466] Hardware name: QEMU Ubuntu 24.04 PC (i440FX + PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014\n[  151.469192] Workqueue:  0x0 (iw_cm_wq)\n[  151.469478] RIP: 0010:__list_del_entry_valid_or_report+0xf0/0x100\n[  151.469942] Code: c7 58 5f 4c b2 e8 10 50 aa ff 0f 0b 48 89 ef e8 36 57 cb ff 48 8b 55 08 48 89 e9 48 89 de 48 c7 c7 a8 5f 4c b2 e8 f0 4f aa ff \u003c0f\u003e 0b 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 90 90 90 90 90 90\n[  151.471323] RSP: 0000:ffffb15644e7bd68 EFLAGS: 00010046\n[  151.471712] RAX: 000000000000006d RBX: ffff9f0915c69c08 RCX: 0000000000000027\n[  151.472243] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff9f0a37d9c600\n[  151.472768] RBP: ffff9f0a15b11c08 R08: 0000000000000000 R09: c0000000ffff7fff\n[  151.473294] R10: 0000000000000001 R11: ffffb15644e7bba8 R12: ffff9f092339ee68\n[  151.473817] R13: ffff9f0900059c28 R14: ffff9f092339ee78 R15: 0000000000000000\n[  151.474344] FS:  0000000000000000(0000) GS:ffff9f0a847b5000(0000) knlGS:0000000000000000\n[  151.474934] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n[  151.475362] CR2: 0000559e233a9088 CR3: 000000020296b004 CR4: 0000000000770ef0\n[  151.475895] PKRU: 55555554\n[  151.476118] Call Trace:\n[  151.476331]  \u003cTASK\u003e\n[  151.476497]  move_linked_works+0x49/0xa0\n[  151.476792]  __pwq_activate_work.isra.46+0x2f/0xa0\n[  151.477151]  pwq_dec_nr_in_flight+0x1e0/0x2f0\n[  151.477479]  process_scheduled_works+0x1c8/0x410\n[  151.477823]  worker_thread+0x125/0x260\n[  151.478108]  ? __pfx_worker_thread+0x10/0x10\n[  151.478430]  kthread+0xfe/0x240\n[  151.478671]  ? __pfx_kthread+0x10/0x10\n[  151.478955]  ? __pfx_kthread+0x10/0x10\n[  151.479240]  ret_from_fork+0x208/0x270\n[  151.479523]  ? __pfx_kthread+0x10/0x10\n[  151.479806]  ret_from_fork_asm+0x1a/0x30\n[  151.480103]  \u003c/TASK\u003e"
    }
  ],
  "id": "CVE-2026-45898",
  "lastModified": "2026-05-27T14:48:31.480",
  "metrics": {},
  "published": "2026-05-27T14:17:04.080",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/38c5b49fffa1b760959af74f11806eeb3ef4706d"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/7874eeacfa42177565c01d5198726671acf7adf2"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/a6b9e793e74e372daa266fd0d58b751305877897"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/eb715133e0ae12514bba4d2d5ce1dee774476056"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Awaiting Analysis"
}

CVE-2026-45898 (GCVE-0-2026-45898)

Vulnerability from cvelistv5 – Published: 2026-05-27 12:17 – Updated: 2026-05-27 12:17

Title

RDMA/iwcm: Fix workqueue list corruption by removing work_list

Summary

Severity

No CVSS data available.

Assigner

Linux

References

4 references

URL	Tags
https://git.kernel.org/stable/c/38c5b49fffa1b7609…
https://git.kernel.org/stable/c/eb715133e0ae12514…
https://git.kernel.org/stable/c/a6b9e793e74e372da…
https://git.kernel.org/stable/c/7874eeacfa4217756…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: e1168f09b3314992f1c5251f3793102035da7237 , < 38c5b49fffa1b760959af74f11806eeb3ef4706d (git) Affected: e1168f09b3314992f1c5251f3793102035da7237 , < eb715133e0ae12514bba4d2d5ce1dee774476056 (git) Affected: e1168f09b3314992f1c5251f3793102035da7237 , < a6b9e793e74e372daa266fd0d58b751305877897 (git) Affected: e1168f09b3314992f1c5251f3793102035da7237 , < 7874eeacfa42177565c01d5198726671acf7adf2 (git)
Linux	Linux	Affected: 6.11 Unaffected: 0 , < 6.11 (semver) Unaffected: 6.12.75 , ≤ 6.12.* (semver) Unaffected: 6.18.14 , ≤ 6.18.* (semver) Unaffected: 6.19.4 , ≤ 6.19.* (semver) Unaffected: 7.0 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/infiniband/core/iwcm.c",
            "drivers/infiniband/core/iwcm.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "38c5b49fffa1b760959af74f11806eeb3ef4706d",
              "status": "affected",
              "version": "e1168f09b3314992f1c5251f3793102035da7237",
              "versionType": "git"
            },
            {
              "lessThan": "eb715133e0ae12514bba4d2d5ce1dee774476056",
              "status": "affected",
              "version": "e1168f09b3314992f1c5251f3793102035da7237",
              "versionType": "git"
            },
            {
              "lessThan": "a6b9e793e74e372daa266fd0d58b751305877897",
              "status": "affected",
              "version": "e1168f09b3314992f1c5251f3793102035da7237",
              "versionType": "git"
            },
            {
              "lessThan": "7874eeacfa42177565c01d5198726671acf7adf2",
              "status": "affected",
              "version": "e1168f09b3314992f1c5251f3793102035da7237",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/infiniband/core/iwcm.c",
            "drivers/infiniband/core/iwcm.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.11"
            },
            {
              "lessThan": "6.11",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.75",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.14",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.19.*",
              "status": "unaffected",
              "version": "6.19.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.0",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.75",
                  "versionStartIncluding": "6.11",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.14",
                  "versionStartIncluding": "6.11",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.19.4",
                  "versionStartIncluding": "6.11",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0",
                  "versionStartIncluding": "6.11",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/iwcm: Fix workqueue list corruption by removing work_list\n\nThe commit e1168f0 (\"RDMA/iwcm: Simplify cm_event_handler()\")\nchanged the work submission logic to unconditionally call\nqueue_work() with the expectation that queue_work() would\nhave no effect if work was already pending. The problem is\nthat a free list of struct iwcm_work is used (for which\nstruct work_struct is embedded), so each call to queue_work()\nis basically unique and therefore does indeed queue the work.\n\nThis causes a problem in the work handler which walks the work_list\nuntil it\u0027s empty to process entries. This means that a single\nrun of the work handler could process item N+1 and release it\nback to the free list while the actual workqueue entry is still\nqueued. It could then get reused (INIT_WORK...) and lead to\nlist corruption in the workqueue logic.\n\nFix this by just removing the work_list. The workqueue already\ndoes this for us.\n\nThis fixes the following error that was observed when stress\ntesting with ucmatose on an Intel E830 in iWARP mode:\n\n[  151.465780] list_del corruption. next-\u003eprev should be ffff9f0915c69c08, but was ffff9f0a1116be08. (next=ffff9f0a15b11c08)\n[  151.466639] ------------[ cut here ]------------\n[  151.466986] kernel BUG at lib/list_debug.c:67!\n[  151.467349] Oops: invalid opcode: 0000 [#1] SMP NOPTI\n[  151.467753] CPU: 14 UID: 0 PID: 2306 Comm: kworker/u64:18 Not tainted 6.19.0-rc4+ #1 PREEMPT(voluntary)\n[  151.468466] Hardware name: QEMU Ubuntu 24.04 PC (i440FX + PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014\n[  151.469192] Workqueue:  0x0 (iw_cm_wq)\n[  151.469478] RIP: 0010:__list_del_entry_valid_or_report+0xf0/0x100\n[  151.469942] Code: c7 58 5f 4c b2 e8 10 50 aa ff 0f 0b 48 89 ef e8 36 57 cb ff 48 8b 55 08 48 89 e9 48 89 de 48 c7 c7 a8 5f 4c b2 e8 f0 4f aa ff \u003c0f\u003e 0b 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 90 90 90 90 90 90\n[  151.471323] RSP: 0000:ffffb15644e7bd68 EFLAGS: 00010046\n[  151.471712] RAX: 000000000000006d RBX: ffff9f0915c69c08 RCX: 0000000000000027\n[  151.472243] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff9f0a37d9c600\n[  151.472768] RBP: ffff9f0a15b11c08 R08: 0000000000000000 R09: c0000000ffff7fff\n[  151.473294] R10: 0000000000000001 R11: ffffb15644e7bba8 R12: ffff9f092339ee68\n[  151.473817] R13: ffff9f0900059c28 R14: ffff9f092339ee78 R15: 0000000000000000\n[  151.474344] FS:  0000000000000000(0000) GS:ffff9f0a847b5000(0000) knlGS:0000000000000000\n[  151.474934] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n[  151.475362] CR2: 0000559e233a9088 CR3: 000000020296b004 CR4: 0000000000770ef0\n[  151.475895] PKRU: 55555554\n[  151.476118] Call Trace:\n[  151.476331]  \u003cTASK\u003e\n[  151.476497]  move_linked_works+0x49/0xa0\n[  151.476792]  __pwq_activate_work.isra.46+0x2f/0xa0\n[  151.477151]  pwq_dec_nr_in_flight+0x1e0/0x2f0\n[  151.477479]  process_scheduled_works+0x1c8/0x410\n[  151.477823]  worker_thread+0x125/0x260\n[  151.478108]  ? __pfx_worker_thread+0x10/0x10\n[  151.478430]  kthread+0xfe/0x240\n[  151.478671]  ? __pfx_kthread+0x10/0x10\n[  151.478955]  ? __pfx_kthread+0x10/0x10\n[  151.479240]  ret_from_fork+0x208/0x270\n[  151.479523]  ? __pfx_kthread+0x10/0x10\n[  151.479806]  ret_from_fork_asm+0x1a/0x30\n[  151.480103]  \u003c/TASK\u003e"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-27T12:17:07.737Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/38c5b49fffa1b760959af74f11806eeb3ef4706d"
        },
        {
          "url": "https://git.kernel.org/stable/c/eb715133e0ae12514bba4d2d5ce1dee774476056"
        },
        {
          "url": "https://git.kernel.org/stable/c/a6b9e793e74e372daa266fd0d58b751305877897"
        },
        {
          "url": "https://git.kernel.org/stable/c/7874eeacfa42177565c01d5198726671acf7adf2"
        }
      ],
      "title": "RDMA/iwcm: Fix workqueue list corruption by removing work_list",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-45898",
    "datePublished": "2026-05-27T12:17:07.737Z",
    "dateReserved": "2026-05-13T15:03:33.083Z",
    "dateUpdated": "2026-05-27T12:17:07.737Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

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.

Action not permitted

FKIE_CVE-2026-45898

CVE-2026-45898 (GCVE-0-2026-45898)

Tags

Sightings

Nomenclature