CVE-2026-80795
nfc: nci: fix out-of-bounds write in nci_target_auto_activated()
Published Sep 4, 2026
CVSS n/a
EPSS < 1%
KEV · Not listed
Description
In the Linux kernel, the following vulnerability has been resolved:
nfc: nci: fix out-of-bounds write in nci_target_auto_activated()
nci_target_auto_activated() appends a target to the fixed-size array
ndev->targets[NCI_MAX_DISCOVERED_TARGETS] and increments ndev->n_targets
without first checking the array is full; unlike its sibling
nci_add_new_target(), which bails out when n_targets already equals
NCI_MAX_DISCOVERED_TARGETS.
ndev->n_targets is only cleared by nci_clear_target_list(), so an NFCC
that repeatedly re-runs discovery (RF_DISCOVER_RSP, which re-enters
NCI_DISCOVERY without clearing the target list) and reports an
auto-activated target (RF_INTF_ACTIVATED_NTF) drives n_targets past the
limit. The append then writes a struct nfc_target past the end of the
array (a slab out-of-bounds write), and nfc_targets_found() goes on to
walk the array with the inflated count:
BUG: KASAN: slab-out-of-bounds in nci_add_new_protocol+0x94/0x2ac [nci]
Write of size 2 at addr ffff0000c7299a18 by task kworker/u8:0/12
Workqueue: nfc0_nci_rx_wq nci_rx_work [nci]
Call trace:
nci_add_new_protocol+0x94/0x2ac [nci]
nci_ntf_packet+0xddc/0x11a0 [nci]
nci_rx_work+0x15c/0x1e0 [nci]
process_one_work+0x2dc/0x500
worker_thread+0x240/0x460
kthread+0x1c0/0x1d0
ret_from_fork+0x10/0x20
The buggy address belongs to the cache kmalloc-2k of size 2048
The buggy address is located 1024 bytes to the right of
allocated 1560-byte region [ffff0000c7299000, ffff0000c7299618)
Guard nci_target_auto_activated() with the same check used by
nci_add_new_target().
nfc: nci: fix out-of-bounds write in nci_target_auto_activated()
nci_target_auto_activated() appends a target to the fixed-size array
ndev->targets[NCI_MAX_DISCOVERED_TARGETS] and increments ndev->n_targets
without first checking the array is full; unlike its sibling
nci_add_new_target(), which bails out when n_targets already equals
NCI_MAX_DISCOVERED_TARGETS.
ndev->n_targets is only cleared by nci_clear_target_list(), so an NFCC
that repeatedly re-runs discovery (RF_DISCOVER_RSP, which re-enters
NCI_DISCOVERY without clearing the target list) and reports an
auto-activated target (RF_INTF_ACTIVATED_NTF) drives n_targets past the
limit. The append then writes a struct nfc_target past the end of the
array (a slab out-of-bounds write), and nfc_targets_found() goes on to
walk the array with the inflated count:
BUG: KASAN: slab-out-of-bounds in nci_add_new_protocol+0x94/0x2ac [nci]
Write of size 2 at addr ffff0000c7299a18 by task kworker/u8:0/12
Workqueue: nfc0_nci_rx_wq nci_rx_work [nci]
Call trace:
nci_add_new_protocol+0x94/0x2ac [nci]
nci_ntf_packet+0xddc/0x11a0 [nci]
nci_rx_work+0x15c/0x1e0 [nci]
process_one_work+0x2dc/0x500
worker_thread+0x240/0x460
kthread+0x1c0/0x1d0
ret_from_fork+0x10/0x20
The buggy address belongs to the cache kmalloc-2k of size 2048
The buggy address is located 1024 bytes to the right of
allocated 1560-byte region [ffff0000c7299000, ffff0000c7299618)
Guard nci_target_auto_activated() with the same check used by
nci_add_new_target().
Affected Products
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CVE record
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NVD configurations
No data
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Red Hat packages
No data
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OpenCVE enrichment
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Linux | Linux | unaffected |
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| Linux | Linux | affected |
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No data.
No data.
| Vendor | Product | Versions | ||||||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Linux | Linux Kernel |
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| Linux | Linux Kernel |
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Remediation
Tracking
Advisories
| Source | ID | Title |
|---|---|---|
 Debian DLA |
DLA-4777-1 | linux security update |
| Debian DLA |
DLA-4788-1 | linux-6.12 security update |
 Ubuntu USN |
USN-8961-1 | Linux kernel vulnerabilities |
| Ubuntu USN |
USN-9019-1 | Linux kernel (Azure) vulnerabilities |
| Ubuntu USN |
USN-9020-1 | Linux kernel vulnerabilities |
| Ubuntu USN |
USN-9022-1 | Linux kernel vulnerabilities |
| Ubuntu USN |
USN-9023-1 | Linux kernel vulnerabilities |
| Ubuntu USN |
USN-9024-1 | Linux kernel vulnerabilities |
| Ubuntu USN |
USN-9025-1 | Linux kernel vulnerabilities |
| Ubuntu USN |
USN-9026-1 | Linux kernel (Azure) vulnerabilities |
| Ubuntu USN |
USN-9029-1 | Linux kernel (Raspberry Pi) vulnerabilities |
| Ubuntu USN |
USN-9039-1 | Linux kernel (Azure CVM) vulnerabilities |
| Ubuntu USN |
USN-9040-1 | Linux kernel (Low Latency NVIDIA) vulnerabilities |
| Ubuntu USN |
USN-9066-1 | Linux kernel (HWE) vulnerabilities |
| Ubuntu USN |
USN-9091-1 | Linux kernel (NVIDIA Tegra) vulnerabilities |
Metrics
No CVSS v4.0
No CVSS v3.1
No CVSS v3.0
No CVSS v2
This CVE is not in the KEV list.
Exploit prediction score: < 1% (0.195% probability within 30 days)
Key SSVC decision points have not yet been added.
References
History
Sep 4, 2026 5:15 PM
Weaknesses updated
View changes
| Type | Values Removed | Values Added |
|---|---|---|
| Weaknesses | CWE-119 CWE-787 |
Sep 4, 2026 3:30 PM
Description updated. Title updated. First appearance in the feed. Affected versions updated. Affected vendors updated. Added references
View changes
| Type | Values Removed | Values Added |
|---|---|---|
| Description | In the Linux kernel, the following vulnerability has been resolved: nfc: nci: fix out-of-bounds write in nci_target_auto_activated() nci_target_auto_activated() appends a target to the fixed-size array ndev->targets[NCI_MAX_DISCOVERED_TARGETS] and increments ndev->n_targets without first checking the array is full; unlike its sibling nci_add_new_target(), which bails out when n_targets already equals NCI_MAX_DISCOVERED_TARGETS. ndev->n_targets is only cleared by nci_clear_target_list(), so an NFCC that repeatedly re-runs discovery (RF_DISCOVER_RSP, which re-enters NCI_DISCOVERY without clearing the target list) and reports an auto-activated target (RF_INTF_ACTIVATED_NTF) drives n_targets past the limit. The append then writes a struct nfc_target past the end of the array (a slab out-of-bounds write), and nfc_targets_found() goes on to walk the array with the inflated count: BUG: KASAN: slab-out-of-bounds in nci_add_new_protocol+0x94/0x2ac [nci] Write of size 2 at addr ffff0000c7299a18 by task kworker/u8:0/12 Workqueue: nfc0_nci_rx_wq nci_rx_work [nci] Call trace: nci_add_new_protocol+0x94/0x2ac [nci] nci_ntf_packet+0xddc/0x11a0 [nci] nci_rx_work+0x15c/0x1e0 [nci] process_one_work+0x2dc/0x500 worker_thread+0x240/0x460 kthread+0x1c0/0x1d0 ret_from_fork+0x10/0x20 The buggy address belongs to the cache kmalloc-2k of size 2048 The buggy address is located 1024 bytes to the right of allocated 1560-byte region [ffff0000c7299000, ffff0000c7299618) Guard nci_target_auto_activated() with the same check used by nci_add_new_target(). | |
| Title | nfc: nci: fix out-of-bounds write in nci_target_auto_activated() | |
| First Time appeared |
Linux
Linux linux Kernel |
|
| CPEs | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | |
| Vendors & Products |
Linux
Linux linux Kernel |
|
| References |
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