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net: mvpp2: guard flow control update with global_tx_fc in buffer switching

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: net: mvpp2: guard flow control update with global_tx_fc in buffer switching mvpp2_bm_switch_buffers() unconditionally calls mvpp2_bm_pool_update_priv_fc() when switching between per-cpu and shared buffer pool modes. This function programs CM3 flow control registers via mvpp2_cm3_read()/mvpp2_cm3_write(), which dereference priv->cm3_base without any NULL check. When the CM3 SRAM resource is not present in the device tree (the third reg entry added by commit 60523583b07c ("dts: marvell: add CM3 SRAM memory to cp11x ethernet device tree")), priv->cm3_base remains NULL and priv->global_tx_fc is false. Any operation that triggers mvpp2_bm_switch_buffers(), for example an MTU change that crosses the jumbo frame threshold, will crash: Unable to handle kernel NULL pointer dereference at virtual address 0000000000000000 Mem abort info: ESR = 0x0000000096000006 EC = 0x25: DABT (current EL), IL = 32 bits pc : readl+0x0/0x18 lr : mvpp2_cm3_read.isra.0+0x14/0x20 Call trace: readl+0x0/0x18 mvpp2_bm_pool_update_fc+0x40/0x12c mvpp2_bm_pool_update_priv_fc+0x94/0xd8 mvpp2_bm_switch_buffers.isra.0+0x80/0x1c0 mvpp2_change_mtu+0x140/0x380 __dev_set_mtu+0x1c/0x38 dev_set_mtu_ext+0x78/0x118 dev_set_mtu+0x48/0xa8 dev_ifsioc+0x21c/0x43c dev_ioctl+0x2d8/0x42c sock_ioctl+0x314/0x378 Every other flow control call site in the driver already guards hardware access with either priv->global_tx_fc or port->tx_fc. mvpp2_bm_switch_buffers() is

Announced Source revision 1
Original source ↗

CVE-2026-23438

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-23438

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "3a616b92a9d17448d96a33bf58e69f01457fd43a",
        "lessThan": "0cfcd31f98fc608dc9406bff3fee3a9dd364d014",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "3a616b92a9d17448d96a33bf58e69f01457fd43a",
        "lessThan": "da089f74a993f846685067b14158cb41b879ff29",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "3a616b92a9d17448d96a33bf58e69f01457fd43a",
        "lessThan": "ff0c54f088f7ab91dbbf47cf8244460f99122750",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "3a616b92a9d17448d96a33bf58e69f01457fd43a",
        "lessThan": "7bd20f4b3ef3044dc55acd5b8ef748a70d29d03f",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "3a616b92a9d17448d96a33bf58e69f01457fd43a",
        "lessThan": "7df2b50cae1a76cbb90b294f3edb61e3e10bf2e9",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "3a616b92a9d17448d96a33bf58e69f01457fd43a",
        "lessThan": "8baced53a35fc9710f80d6ca016a2c418dc3231f",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "3a616b92a9d17448d96a33bf58e69f01457fd43a",
        "lessThan": "8a63baadf08453f66eb582fdb6dd234f72024723",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "5.12"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "5.12",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.15.203",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.167",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.130",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.78",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.20",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "6.19.10",
        "versionType": "semver",
        "lessThanOrEqual": "6.19.*"
      },
      {
        "status": "unaffected",
        "version": "7.0",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-23438

Source reference: /cveMetadata/cveId

Publisher severity

No explicit severity was provided.

Event
#27252 · Revision 1
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