# Linux Kernel 6.6.156

- Product: Linux Kernel (https://whatsnew.fyi/product/linux-kernel)
- Vendor: Linux Kernel Organization
- Date: 2026-09-02
- Version: 6.6.156
- Original notes: https://cdn.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.6.156
- Permalink: https://whatsnew.fyi/product/linux-kernel/releases/6.6.156
- Labels: longterm

What's New is an index, not a publisher: every entry below links to the vendor's own release notes, which are the authoritative source. Entries are labelled where they are hand-curated sample data, pre-releases, or drawn from a secondary source such as a developer blog.

Reuse: the summaries, labels and curation here are © What's New. Quote freely with attribution and a link back; wholesale republication of the corpus is not permitted — terms: https://whatsnew.fyi/terms. The vendors' own release notes remain their publishers'.

---

- **fixed** — usb: usbfs: fix use-after-free of usb_device in usbdev_release()
- **fixed** — USB: c67x00: fix use-after-free in c67x00_add_iso_urb()
- **removed** — USB: serial: spcp8x5: drop broken carrier detect support
- **fixed** — USB: serial: option: fix slab OOB read in interrupt URB callback
- **fixed** — ALSA: usb-audio: Complete cleanup after system-resume errors
- **fixed** — ALSA: usb-audio: fix OOB write in snd_usbmidi_novation_output()
- **changed** — usb: core: Strengthen error handling in hub_hub_status()
- **changed** — usb: core: Add lock to usb_wakeup_notification()
- **fixed** — KVM: s390: vsie: zero stale crypto bits
- **removed** — crypto: qce: Remove unsafe/deprecated algorithms
- **fixed** — crypto: mxs-dcp: fix source scatterlist length access
- **fixed** — crypto: qce: fix CCM AAD buffer underallocation
- **fixed** — crypto: atmel-tdes: use scatterlist length before DMA mapping
- **fixed** — mm/swap: reject swapin() on filesystem-level encrypted files
- **fixed** — ipv6: seg6: clear IPv4 control block on IPIP decapsulation
- **fixed** — net: bridge: mcast: fix use-after-free of a master VLAN's multicast context
- **fixed** — xfrm: fix xfrm_state_construct() auth-trunc leak
- **fixed** — xfrm: ah6: validate routing header segments_left
- **fixed** — xfrm: drop ESP-in-TCP packets with no ingress device
- **fixed** — xfrm: espintcp: fix UAF during close

92 commits in this release:

- Linux 6.6.156
- usb: usbfs: fix use-after-free of usb_device in usbdev_release()
- USB: c67x00: fix use-after-free in c67x00_add_iso_urb()
- USB: serial: spcp8x5: drop broken carrier detect support
- USB: serial: option: fix slab OOB read in interrupt URB callback
- ALSA: usb-audio: Complete cleanup after system-resume errors
- ALSA: usb-audio: fix OOB write in snd_usbmidi_novation_output()
- usb: core: Strengthen error handling in hub_hub_status()
- usb: core: Add lock to usb_wakeup_notification()
- KVM: s390: vsie: zero stale crypto bits
- crypto: qce - Remove unsafe/deprecated algorithms
- crypto: mxs-dcp - fix source scatterlist length access
- crypto: qce - fix CCM AAD buffer underallocation
- crypto: atmel-tdes - use scatterlist length before DMA mapping
- mm/swap: reject swapon() on filesystem-level encrypted files
- ipv6: seg6: clear IPv4 control block on IPIP decapsulation
- net: bridge: mcast: fix use-after-free of a master VLAN's multicast context
- xfrm: fix xfrm_state_construct() auth-trunc leak
- xfrm: ah6: validate routing header segments_left
- xfrm: drop ESP-in-TCP packets with no ingress device
- xfrm: espintcp: fix UAF during close
- x86/CPU/AMD: Carve out a Zen5 models range
- x86/CPU/AMD: Add models 0x60-0x6f to the Zen5 range
- x86/CPU/AMD: Add models 0x10-0x1f to the Zen5 range
- x86/CPU/AMD: Add more models to X86_FEATURE_ZEN5
- x86/CPU/AMD: Add X86_FEATURE_ZEN5
- tls: device: fix out-of-bounds write in tls_append_frag()
- usb: gadget: f_tcm: keep port count until LUN teardown completes
- usb: usbtest: disable dynamic ID support
- fuse: fix invalidate lock leak on open O_TRUNC DAX failure
- fuse: fix invalidate lock leak on setattr writeback failure
- xhci: dbgtty: Fix unregister on tty_alloc_driver() failure
- xhci: dbgtty: Fix unregister on tty_register_driver() failure
- usb: xhci: Handle USB3 port events when there is one roothub
- accessibility: speakup: unregister tty ldisc on later init failures
- fpga: dfl: fme: add error handling
- xfs: remove file_path tracepoint data
- Bluetooth: hci_sync: Fix accept list UAF during suspend
- Bluetooth: hci_sync: Use bt_dev_err() to log error message in hci_update_event_filter_sync()
- HID: pidff: fix OOB write when hid->inputs is empty
- HID: pidff: clang-format pass
- HID: pidff: Support device error response from PID_BLOCK_LOAD
- HID: uclogic: fix use-after-free of inrange_timer on remove
- HID: ft260: fix stack-use-after-return write in I2C read race
- HID: ft260: validate i2c input report length
- HID: nintendo: stop device IO before hid_hw_stop on probe failure
- nvmet-tcp: bound SGL data length before allocating command buffers
- nvme: rename CDR/MORE/DNR to NVME_STATUS_*
- nvme: fix status magic numbers
- nvme: rename nvme_sc_to_pr_err to nvme_status_to_pr_err
- HID: magicmouse: prevent unbounded recursion in magicmouse_raw_event()
- HID: magicmouse: re-enable multitouch after reset-resume
- nfc: nci: add data_len bound checks to activation parameter extractors
- nilfs2: reject invalid block index in GC ioctl
- nilfs2: correct return value kernel-doc descriptions for ioctl functions
- ext4: propagate errors from fast commit range replay
- ext4: make some fast commit functions reuse extents path
- ext4: make state in ext4_mb_mark_bb to be bool
- ksmbd: harden file lifetime during session teardown
- crypto: starfive - Do not free stack buffer
- powerpc/hv-gpci: fix preempt count leak in sysfs show paths
- net/sched: initialize noop_qdisc owner
- net/sched: Fix mirred deadlock on device recursion
- selinux: switch two allocations to use kzalloc_objs()
- smc: Use __sk_dst_get() and dst_dev_rcu() in smc_vlan_by_tcpsk().
- ASoC: nau8821: Cancel pending work before suspend
- Revert "PM: sleep: Use complete() in device_pm_sleep_init()"
- riscv: Fix register corruption from uninitialized cregs on error
- bpf: Fix use-after-free in offloaded map/prog info fill
- ASoC: nau8821: Cancel delayed work on component remove
- smc: Use __s

_[Truncated at 4000 characters — full notes: https://cdn.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.6.156]_