USB: serial: option: fix slab OOB read in interrupt URB callback

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-80827
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-04 16:18:10 UTC
Updated2026-09-04 16:18:10 UTC
DescriptionIn 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 ]

Risk And Classification

EPSS: 0.001950000 probability, percentile 0.092800000 (date 2026-09-07)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 58cfe9113e485f7e04bd0eac4fc4251b330af501 fbe60fd2abc8a5561f39719a41ad9a01b5d8e567 git Not specified
CNA Linux Linux affected 58cfe9113e485f7e04bd0eac4fc4251b330af501 94e5525697b9e91ddc4071129874120a50a4f342 git Not specified
CNA Linux Linux affected 58cfe9113e485f7e04bd0eac4fc4251b330af501 6b8cf5422c7e96ed5b22a8368eff663f3f98b8ec git Not specified
CNA Linux Linux affected 58cfe9113e485f7e04bd0eac4fc4251b330af501 030e3a73d3c3aa67c44454649e984d6383cdb7d3 git Not specified
CNA Linux Linux affected 58cfe9113e485f7e04bd0eac4fc4251b330af501 060db7d48af1e650643c8b8319111a9ea2ce4486 git Not specified
CNA Linux Linux affected 58cfe9113e485f7e04bd0eac4fc4251b330af501 2ef5560387f2c0713cee975be2b24b281bd90f3e git Not specified
CNA Linux Linux affected 58cfe9113e485f7e04bd0eac4fc4251b330af501 a72a13c83a652516a0e469d275b81d29a7429049 git Not specified
CNA Linux Linux affected 58cfe9113e485f7e04bd0eac4fc4251b330af501 d762aef4eba354066be21a5d88eb2066e282f4c9 git Not specified
CNA Linux Linux affected 58cfe9113e485f7e04bd0eac4fc4251b330af501 885d802f544ca7bfa8f3984d94233cce715bb6b3 git Not specified
CNA Linux Linux affected 2.6.12 Not specified
CNA Linux Linux unaffected 2.6.12 semver Not specified
CNA Linux Linux unaffected 5.10.269 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.220 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.187 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.156 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.108 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.49 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.13 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2.3 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/d762aef4eba354066be21a5d88eb2066e282f4c9 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/885d802f544ca7bfa8f3984d94233cce715bb6b3 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/a72a13c83a652516a0e469d275b81d29a7429049 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/94e5525697b9e91ddc4071129874120a50a4f342 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/fbe60fd2abc8a5561f39719a41ad9a01b5d8e567 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/6b8cf5422c7e96ed5b22a8368eff663f3f98b8ec 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/060db7d48af1e650643c8b8319111a9ea2ce4486 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/2ef5560387f2c0713cee975be2b24b281bd90f3e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/030e3a73d3c3aa67c44454649e984d6383cdb7d3 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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