CVE-2026-80861: linux
Vulnerability summary
CVE-2026-80861 is a medium (CVSS 5.1) vulnerability in linux. EPSS estimates a 0.16% chance of exploitation in the next 30 days, higher than 4.9% of scored vulnerabilities.
Advisory lineage
Upstream 0 · Downstream 1 · Related 1Timeline
- 04-09-2026PublishedVulnerability first disclosed.
- 19-10-2026Last modifiedVulnerability information updated.
Description
In the Linux kernel, the following vulnerability has been resolved: usb: xhci: bail out of setup if the controller is inaccessible xhci_gen_setup() locates the operational registers using the capability length read from the very first register: xhci->op_regs = hcd->regs + HC_LENGTH(readl(&xhci->cap_regs->hc_capbase)); If the controller is dead or has dropped off the bus, that read returns ~0, HC_LENGTH() truncates it to 0xff, and op_regs ends up 0xff bytes past the page-aligned MMIO base, i.e. unaligned. The first access through it, xhci_halt() -> xhci_handshake() reading op_regs->status, is then an unaligned readl() on device memory. arm64 faults on unaligned device accesses, so instead of xhci_handshake() catching the all-ones value and returning -ENODEV, setup oopses: xhci-pci-renesas 0005:08:00.0: Unable to change power state from D3cold to D0, device inaccessible xhci-pci-renesas 0005:08:00.0: xHCI Host Controller xhci-pci-renesas 0005:08:00.0: new USB bus registered, assigned bus number 1 Unable to handle kernel paging request at virtual address ffff80030a770103 ESR = 0x0000000096000021 FSC = 0x21: alignment fault Internal error: Oops: 0000000096000021 [#1] SMP pc : xhci_halt [xhci_hcd] Call trace: xhci_halt xhci_gen_setup xhci_pci_setup usb_add_hcd usb_hcd_pci_probe xhci_pci_common_probe xhci_pci_renesas_probe This was hit with a Renesas uPD720201 that failed to power up ("Unable to change power state from D3cold to D0, device inaccessible") yet still reached the HCD probe path. Read the capability register once, and if it reads back the all-ones value (as xhci_handshake() and xhci_reset() already test for), abort setup with -ENODEV before op_regs is derived from it. Reading it once also avoids re-reading a register that may change under a concurrent hot-removal.
CVSS metrics
1 score · 1 source · 1 versionEPSS trend
Probability
0.16%
Chance of exploitation in the next 30 days
Percentile
5%
Versus all other CVEs
30-day change
+0.01 pp
From 0.16% on 21-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeNo weakness data has been published for this record.
Affected systems
Ubuntu169 products
- linuxAll versions (No fix recorded)
- linux-allwinner-5.19All versions (No fix recorded)
- linux-awsAll versions (No fix recorded)
- linux-aws-5.0All versions (No fix recorded)
- linux-aws-5.11All versions (No fix recorded)
Debian2 products
- linuxAll versions (No fix recorded) | < 6.12.111-1 | < 7.1.13-1
- linux-6.12< 6.12.111-1~deb12u1
Linux1 product
- linux≥ 66d4eadd8d067269ea8fead1a50fe87c2979a80d, < 301f4a3303b21ea959a8294518ee883710498ac2 | ≥ 66d4eadd8d067269ea8fead1a50fe87c2979a80d, < 70706dbcf122940f4e3595d7ba1445004cc00074 | ≥ 66d4eadd8d067269ea8fead1a50fe87c2979a80d, < c051f66b621695ad7c8438a9497d79e1f4f05edb | ≥ 66d4eadd8d067269ea8fead1a50fe87c2979a80d, < bf84c6b0264947794fa783c324a6d874ca6657d8 | ≥ 66d4eadd8d067269ea8fead1a50fe87c2979a80d, < 0b31744f70c5e06cce5fb660e02d057a3b9e0e37 | ≥ 66d4eadd8d067269ea8fead1a50fe87c2979a80d, < 78203d5b54a40f0e36196ebf31c9c7a380fc8811 | 2.6.31
3 vendors · 172 products
