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usb: atm: usbatm: fix invalid ci_range initialization

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: usb: atm: usbatm: fix invalid ci_range initialization syzbot reported a shift-out-of-bounds in __vcc_connect(): UBSAN: shift-out-of-bounds in net/atm/common.c:382:32 shift exponent -1 is negative CPU: 0 UID: 0 PID: 5987 Comm: syz.0.18 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Compute Engine/Google Compute Engine, BIOS Google 08/05/2026 Call Trace: dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120 ubsan_epilogue+0xa/0x30 lib/ubsan.c:233 __ubsan_handle_shift_out_of_bounds+0x36d/0x400 lib/ubsan.c:494 __vcc_connect+0x14b4/0x19c0 net/atm/common.c:382 vcc_connect+0x328/0x8f0 net/atm/common.c:498 pvc_bind+0x272/0x380 net/atm/pvc.c:52 __sys_bind+0x2e3/0x410 net/socket.c:1976 __x64_sys_bind+0x7a/0x90 net/socket.c:1979 ... ATM device ci_range fields (vpi_bits and vci_bits) represent the number of bits supported for VPI and VCI addressing on the device. net/atm/common.c directly uses these fields as bit shift counts: vpi >> dev->ci_range.vpi_bits vci >> dev->ci_range.vci_bits 1 << vcc->dev->ci_range.vpi_bits 1 << vcc->dev->ci_range.vci_bits usbatm_atm_init() sets ci_range.vpi_bits and ci_range.vci_bits to ATM_CI_MAX (-1), which is defined in as a sentinel value for userspace ATM_SETCIRANGE requests, not a valid bit count. Shifting by -1 is undefined behavior and triggers UBSAN warnings. ATM UNI cell headers allow up to 8 bits for VPI (0..255) and 16 bits for VCI (0..65535). Initialize vpi_bits to 8 and v

Announced Source revision 1
Original source ↗

CVE-2026-90055

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-2026-90055

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": "c59bba75fa500f13ef14215d599ee0d7faa1b954",
        "lessThan": "8442586526c406527bf31206e538c0ce6bc672e6",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "c59bba75fa500f13ef14215d599ee0d7faa1b954",
        "lessThan": "561cbd6d49022c9a383e22a39c87a165a4d39f9c",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "c59bba75fa500f13ef14215d599ee0d7faa1b954",
        "lessThan": "76bc7c3a44856744b64aa91d9afe6d9522a78c42",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "c59bba75fa500f13ef14215d599ee0d7faa1b954",
        "lessThan": "7baa0c92be39eb3da755ed6f200497a57078c47b",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "c59bba75fa500f13ef14215d599ee0d7faa1b954",
        "lessThan": "1e964d414bfd9f8dfe9948d08e4b9dda4ed2e422",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "c59bba75fa500f13ef14215d599ee0d7faa1b954",
        "lessThan": "ff7f77a234f7b74e5955a6e34fa74eca4c9ca44c",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "c59bba75fa500f13ef14215d599ee0d7faa1b954",
        "lessThan": "75667703115154a4fd9cf259d4f826d8729cbcda",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "c59bba75fa500f13ef14215d599ee0d7faa1b954",
        "lessThan": "a60fd8c6dbaa76da4163cf225ed2b9e982540f39",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "drivers/usb/atm/usbatm.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "2.6.13"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "2.6.13",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.270",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.221",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.188",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.157",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.110",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.52",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.2.6",
        "versionType": "semver",
        "lessThanOrEqual": "7.2.*"
      },
      {
        "status": "unaffected",
        "version": "7.3",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "drivers/usb/atm/usbatm.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-90055

Source reference: /cveMetadata/cveId

Publisher severity

No explicit severity was provided.

Event
#36474 · Revision 1
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Publisher date
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