CVE-2026-98903

Full vulnerability record from the local CVENow database.

Description

In the Linux kernel, the following vulnerability has been resolved: mailbox: imx: Add a channel shutdown field sashiko complained about possible teardown problem. The scenario CPU 0 CPU 1 imx_mu_isr() imx_mu_shutdown() imx_mu_xcr_rmw(priv, IMX_MU_RCR, 0, IMX_MU_xCR_RIEn(priv->dcfg->type, cp->idx)); imx_mu_specific_rx() imx_mu_xcr_rmw(priv, IMX_MU_RCR, IMX_MU_xCR_RIEn(priv->dcfg->type, 0), 0); free_irq() The RX event remains enabled because in this short window the RX event was disabled in ->shutdown() while the interrupt was active and then enabled again by the ISR while ->shutdown waited in free_irq(). This race requires timing and if happens can be problematic on shared handlers if the "removed" channel triggers an interrupt. In this case the irq-core will shutdown the interrupt with the "nobody cared" message. Introduce imx_mu_con_priv::shutdown to signal that the channel is shutting down. This flag is set with the lock held (by imx_mu_xcr_clr_shut()). The unmask side uses imx_mu_xcr_set_act() which only enables the event if the channel has not been shutdown and serialises on the same lock.

Severity

Not scored

CVSS score

Not available

Vulnerability status

Received

Source identifier

416baaa9-dc9f-4396-8d5f-8c081fb06d67

Published

2026-10-23 12:18:24.370000

Last modified

2026-10-26 07:17:15.670000

View original CVE JSON

{
  "id": "CVE-2026-98903",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2026-10-23T12:18:24.370",
  "lastModified": "2026-10-26T07:17:15.670",
  "vulnStatus": "Received",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmailbox: imx: Add a channel shutdown field\n\nsashiko complained about possible teardown problem. The scenario\n\n CPU 0                              CPU 1\n  imx_mu_isr()                   imx_mu_shutdown()\n                                   imx_mu_xcr_rmw(priv, IMX_MU_RCR, 0, IMX_MU_xCR_RIEn(priv->dcfg->type, cp->idx));\n    imx_mu_specific_rx()\n      imx_mu_xcr_rmw(priv, IMX_MU_RCR, IMX_MU_xCR_RIEn(priv->dcfg->type, 0), 0);\n                                   free_irq()\n\nThe RX event remains enabled because in this short window the RX event\nwas disabled in ->shutdown() while the interrupt was active and then\nenabled again by the ISR while ->shutdown waited in free_irq().\n\nThis race requires timing and if happens can be problematic on shared\nhandlers if the \"removed\" channel triggers an interrupt. In this case\nthe irq-core will shutdown the interrupt with the \"nobody cared\"\nmessage.\n\nIntroduce imx_mu_con_priv::shutdown to signal that the channel is\nshutting down. This flag is set with the lock held (by\nimx_mu_xcr_clr_shut()). The unmask side uses imx_mu_xcr_set_act() which\nonly enables the event if the channel has not been shutdown and\nserialises on the same lock."
    }
  ],
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "programFiles": [
            "drivers/mailbox/imx-mailbox.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "version": "0a67003b1985c79811160af1b01aca07cd5fbc53",
              "lessThan": "02273054b2e94e53065ea5644265bb9d8f7ee2a7",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "0a67003b1985c79811160af1b01aca07cd5fbc53",
              "lessThan": "944d8509c2220a2313d4a094a646507929fb6f8d",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "0a67003b1985c79811160af1b01aca07cd5fbc53",
              "lessThan": "5ccea7eacb7786c358833634f45700365f6c1d99",
              "versionType": "git",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "programFiles": [
            "drivers/mailbox/imx-mailbox.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "version": "5.7",
              "status": "affected"
            },
            {
              "version": "0",
              "lessThan": "5.7",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.12.111",
              "lessThanOrEqual": "6.12.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.18.53",
              "lessThanOrEqual": "6.18.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "7.2",
              "lessThanOrEqual": "*",
              "versionType": "original_commit_for_fix",
              "status": "unaffected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {},
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/02273054b2e94e53065ea5644265bb9d8f7ee2a7",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/5ccea7eacb7786c358833634f45700365f6c1d99",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/944d8509c2220a2313d4a094a646507929fb6f8d",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ]
}