USB: serial: option: fix slab OOB read in interrupt URB callback
In the Linux kernel, the following vulnerability has been resolved: USB: serial: option: fix slab OOB read in interrupt URB callback The interrupt URB buffer is allocated in setup_port_interrupt_in() based on the endpoint's wMaxPacketSize: buffer_size = usb_endpoint_maxp(epd); port->interrupt_in_buffer = kmalloc(buffer_size, GFP_KERNEL); When a USB device declares wMaxPacketSize = 8 on its interrupt IN endpoint, the buffer is allocated from kmalloc-8 cache (exactly 8 bytes). If the device sends a short packet (actual_length < wMaxPacketSize), the URB completes with status == 0 and the callback proceeds to read: data[sizeof(struct usb_ctrlrequest)] which evaluates to data[8], accessing 1 byte beyond the allocated 8-byte buffer. This results in a slab out-of-bounds read. Fix this by adding the missing bounds check: first verify that the actual length is large enough to contain the struct usb_ctrlrequest header before accessing req_pkt->bRequestType and req_pkt->bRequest, and then verify that there is an additional byte for the modem signal state before reading data[sizeof(struct usb_ctrlrequest)] inside the conditional. Use sizeof(*req_pkt) instead of sizeof(struct usb_ctrlrequest) for consistency. [ johan: use dev_err(); split signals declaration and initialisation ]
CVE-2026-80827
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-2026-80827
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": "58cfe9113e485f7e04bd0eac4fc4251b330af501",
"lessThan": "fbe60fd2abc8a5561f39719a41ad9a01b5d8e567",
"versionType": "git"
},
{
"status": "affected",
"version": "58cfe9113e485f7e04bd0eac4fc4251b330af501",
"lessThan": "94e5525697b9e91ddc4071129874120a50a4f342",
"versionType": "git"
},
{
"status": "affected",
"version": "58cfe9113e485f7e04bd0eac4fc4251b330af501",
"lessThan": "6b8cf5422c7e96ed5b22a8368eff663f3f98b8ec",
"versionType": "git"
},
{
"status": "affected",
"version": "58cfe9113e485f7e04bd0eac4fc4251b330af501",
"lessThan": "030e3a73d3c3aa67c44454649e984d6383cdb7d3",
"versionType": "git"
},
{
"status": "affected",
"version": "58cfe9113e485f7e04bd0eac4fc4251b330af501",
"lessThan": "060db7d48af1e650643c8b8319111a9ea2ce4486",
"versionType": "git"
},
{
"status": "affected",
"version": "58cfe9113e485f7e04bd0eac4fc4251b330af501",
"lessThan": "2ef5560387f2c0713cee975be2b24b281bd90f3e",
"versionType": "git"
},
{
"status": "affected",
"version": "58cfe9113e485f7e04bd0eac4fc4251b330af501",
"lessThan": "a72a13c83a652516a0e469d275b81d29a7429049",
"versionType": "git"
},
{
"status": "affected",
"version": "58cfe9113e485f7e04bd0eac4fc4251b330af501",
"lessThan": "d762aef4eba354066be21a5d88eb2066e282f4c9",
"versionType": "git"
},
{
"status": "affected",
"version": "58cfe9113e485f7e04bd0eac4fc4251b330af501",
"lessThan": "885d802f544ca7bfa8f3984d94233cce715bb6b3",
"versionType": "git"
}
],
"programFiles": [
"drivers/usb/serial/option.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "2.6.12"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "2.6.12",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.269",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.220",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.187",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.156",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.108",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.49",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.1.13",
"versionType": "semver",
"lessThanOrEqual": "7.1.*"
},
{
"status": "unaffected",
"version": "7.2.3",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/usb/serial/option.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-80827
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #34845 · Revision 1
- Added to Heist Feed
- Publisher date