{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-90055", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-11T19:38:34.783Z", "datePublished": "2026-09-17T16:05:40.304Z", "dateUpdated": "2026-10-19T08:57:12.606Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T08:57:12.606Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nusb: atm: usbatm: fix invalid ci_range initialization\n\nsyzbot reported a shift-out-of-bounds in __vcc_connect():\n\n UBSAN: shift-out-of-bounds in net/atm/common.c:382:32\n shift exponent -1 is negative\n CPU: 0 UID: 0 PID: 5987 Comm: syz.0.18 Not tainted syzkaller #0 PREEMPT(full)\n Hardware name: Google Compute Engine/Google Compute Engine, BIOS Google 08/05/2026\n Call Trace:\n \n dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120\n ubsan_epilogue+0xa/0x30 lib/ubsan.c:233\n __ubsan_handle_shift_out_of_bounds+0x36d/0x400 lib/ubsan.c:494\n __vcc_connect+0x14b4/0x19c0 net/atm/common.c:382\n vcc_connect+0x328/0x8f0 net/atm/common.c:498\n pvc_bind+0x272/0x380 net/atm/pvc.c:52\n __sys_bind+0x2e3/0x410 net/socket.c:1976\n __x64_sys_bind+0x7a/0x90 net/socket.c:1979\n ...\n\nATM device ci_range fields (vpi_bits and vci_bits) represent the\nnumber of bits supported for VPI and VCI addressing on the device.\nnet/atm/common.c directly uses these fields as bit shift counts:\n vpi >> dev->ci_range.vpi_bits\n vci >> dev->ci_range.vci_bits\n 1 << vcc->dev->ci_range.vpi_bits\n 1 << vcc->dev->ci_range.vci_bits\n\nusbatm_atm_init() sets ci_range.vpi_bits and ci_range.vci_bits to\nATM_CI_MAX (-1), which is defined in as a\nsentinel value for userspace ATM_SETCIRANGE requests, not a valid bit\ncount. Shifting by -1 is undefined behavior and triggers UBSAN\nwarnings.\n\nATM UNI cell headers allow up to 8 bits for VPI (0..255) and 16 bits\nfor VCI (0..65535). Initialize vpi_bits to 8 and vci_bits to 16, as\ndone by solos-pci." } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/usb/atm/usbatm.c" ], "versions": [ { "version": "c59bba75fa500f13ef14215d599ee0d7faa1b954", "lessThan": "8442586526c406527bf31206e538c0ce6bc672e6", "status": "affected", "versionType": "git" }, { "version": "c59bba75fa500f13ef14215d599ee0d7faa1b954", "lessThan": "561cbd6d49022c9a383e22a39c87a165a4d39f9c", "status": "affected", "versionType": "git" }, { "version": "c59bba75fa500f13ef14215d599ee0d7faa1b954", "lessThan": "76bc7c3a44856744b64aa91d9afe6d9522a78c42", "status": "affected", "versionType": "git" }, { "version": "c59bba75fa500f13ef14215d599ee0d7faa1b954", "lessThan": "7baa0c92be39eb3da755ed6f200497a57078c47b", "status": "affected", "versionType": "git" }, { "version": "c59bba75fa500f13ef14215d599ee0d7faa1b954", "lessThan": "1e964d414bfd9f8dfe9948d08e4b9dda4ed2e422", "status": "affected", "versionType": "git" }, { "version": "c59bba75fa500f13ef14215d599ee0d7faa1b954", "lessThan": "ff7f77a234f7b74e5955a6e34fa74eca4c9ca44c", "status": "affected", "versionType": "git" }, { "version": "c59bba75fa500f13ef14215d599ee0d7faa1b954", "lessThan": "75667703115154a4fd9cf259d4f826d8729cbcda", "status": "affected", "versionType": "git" }, { "version": "c59bba75fa500f13ef14215d599ee0d7faa1b954", "lessThan": "a60fd8c6dbaa76da4163cf225ed2b9e982540f39", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/usb/atm/usbatm.c" ], "versions": [ { "version": "2.6.13", "status": "affected" }, { "version": "0", "lessThan": "2.6.13", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.270", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.221", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.188", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.157", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.110", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.52", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2.6", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.3", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.13", "versionEndExcluding": "5.10.270" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.13", "versionEndExcluding": "5.15.221" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.13", "versionEndExcluding": "6.1.188" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.13", "versionEndExcluding": "6.6.157" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.13", "versionEndExcluding": "6.12.110" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.13", "versionEndExcluding": "6.18.52" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.13", "versionEndExcluding": "7.2.6" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.13", "versionEndExcluding": "7.3" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/8442586526c406527bf31206e538c0ce6bc672e6" }, { "url": "https://git.kernel.org/stable/c/561cbd6d49022c9a383e22a39c87a165a4d39f9c" }, { "url": "https://git.kernel.org/stable/c/76bc7c3a44856744b64aa91d9afe6d9522a78c42" }, { "url": "https://git.kernel.org/stable/c/7baa0c92be39eb3da755ed6f200497a57078c47b" }, { "url": "https://git.kernel.org/stable/c/1e964d414bfd9f8dfe9948d08e4b9dda4ed2e422" }, { "url": "https://git.kernel.org/stable/c/ff7f77a234f7b74e5955a6e34fa74eca4c9ca44c" }, { "url": "https://git.kernel.org/stable/c/75667703115154a4fd9cf259d4f826d8729cbcda" }, { "url": "https://git.kernel.org/stable/c/a60fd8c6dbaa76da4163cf225ed2b9e982540f39" } ], "title": "usb: atm: usbatm: fix invalid ci_range initialization", "x_generator": { "engine": "bippy-1.2.0" } } } }