# Linux Kernel 6.18.49

- Product: Linux Kernel (https://whatsnew.fyi/product/linux-kernel)
- Vendor: Linux Kernel Organization
- Date: 2026-09-02
- Version: 6.18.49
- Original notes: https://cdn.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.18.49
- Permalink: https://whatsnew.fyi/product/linux-kernel/releases/6.18.49
- 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'.

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- **fixed** — usb: usbfs: fix use-after-free of usb_device in usbdev_release()
- **fixed** — wifi: mt76: mt7925: ensure tx headroom in usb_sdio_tx_prepare_skb
- **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
- **changed** — crypto: krb5 - use kfree_sensitive() for derived key buffers
- **fixed** — crypto: atmel-tdes - use scatterlist length before DMA mapping
- **fixed** — crypto: qcom-rng - Allow zero as a random number
- **removed** — crypto: qcom-rng - Remove crypto_rng interface
- **fixed** — crypto: qcom-rng - Enable clock in hwrng case
- **fixed** — crypto: virtio - bound the akcipher result length
- **fixed** — mm/swap: reject swapon() on filesystem-level encrypted files

84 commits in this release:

- Linux 6.18.49
- usb: usbfs: fix use-after-free of usb_device in usbdev_release()
- wifi: mt76: mt7925: ensure tx headroom in usb_sdio_tx_prepare_skb
- 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: krb5 - use kfree_sensitive() for derived key buffers
- crypto: atmel-tdes - use scatterlist length before DMA mapping
- crypto: qcom-rng - Allow zero as a random number
- crypto: qcom-rng - Remove crypto_rng interface
- crypto: qcom-rng - Enable clock in hwrng case
- crypto: virtio - bound the akcipher result length
- kunit: irq: Continue increasing hrtimer interval for longer
- mm/swap: reject swapon() on filesystem-level encrypted files
- netfilter: nf_tables: don't queue packet path object notifications
- netfilter: nft_set_pipapo_avx2: add missing vzeroupper
- vxlan: keep the last remote linked during FDB flush
- batman-adv: reject unrepresentable multicast TVLV offsets
- ipv6: seg6: clear IPv4 control block on IPIP decapsulation
- net: bridge: mcast: fix use-after-free of a master VLAN's multicast context
- xfrm: bound nat keepalive state collection
- xfrm: fix xfrm_state_construct() auth-trunc leak
- xfrm: ah6: validate routing header segments_left
- xfrm: avoid lock inversion in nat keepalive work
- xfrm: drop ESP-in-TCP packets with no ingress device
- xfrm: espintcp: fix UAF during close
- net/tcp-ao: fix use-after-free of current_key on reconnect to another peer
- tcp: fix AO info use-after-free in tcp_ao_connect_init()
- net/tcp: fix TCP-AO key deletion in VRFs
- x86/CPU/AMD: Carve out a Zen5 models range
- gtp: serialize PDP context updates
- tls: device: fix out-of-bounds write in tls_append_frag()
- KVM: SEV: Wire up kvm_x86_ops.gmem_xxx() if and only if CONFIG_KVM_AMD_SEV=y
- KVM: SEV: Mark vCPU RUNNABLE after AP_CREATE, even if VMSA is unusable
- KVM: SEV: Extract loading of guest-provided VMSA to a separate helper
- KVM: SEV: Track the GPA of the guest-controlled VMSA used for SNP guests
- KVM: SEV: Drop FOLL_WRITE for encrypted region registration
- 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
- usb: xhci: Handle bogus TRB pointers in Missed Service Error events
- accessibility: speakup: unregister tty ldisc on later init failures
- fpga: dfl: fme: add error handling
- ksmbd: harden file lifetime during session teardown
- HID: ft260: fix stack-use-after-return write in I2C read race
- HID: ft260: validate i2c input report length
- HID: asus: fix missing hid_is_usb() check
- HID: asus: simplify RGB init sequence
- HID: magicmouse: prevent unbounded recursion in magicmouse_raw_event()
- io_uring: defer eventfd signaling when queued from a wakeup handler
- io_uring/rsrc: improve regbuf iov validation
- io_uring: simplify IORING_SETUP_DEFER_TASKRUN && !SQPOLL check
- io_uring/futex: only mark private futex waits as inflight
- powerpc/hv-gpci: fix preempt count leak in sysfs show paths
- veth: fix OOB txq access in veth_poll() with asymmetric queue counts
- selinux: switch two allocations to use kzalloc_objs()
- ASoC: nau8821: Cancel pending work b

_[Truncated at 4000 characters — full notes: https://cdn.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.18.49]_