# Linux Kernel 5.15.218

- Product: Linux Kernel (https://whatsnew.fyi/product/linux-kernel)
- Vendor: Linux Kernel Organization
- Date: 2026-08-27
- Version: 5.15.218
- Original notes: https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.15.218
- Permalink: https://whatsnew.fyi/product/linux-kernel/releases/5.15.218
- 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** — HID: hyperv: validate initial device info bounds
- **fixed** — HID: sensor: custom: Fix use-after-free in enable_sensor
- **fixed** — HID: core: fix number/pointer type confusion on long items
- **fixed** — can: isotp: fix timer drain order, wakeup handling and tx_gen ordering
- **changed** — can: use skb hash instead of private variable in headroom
- **fixed** — mptcp: pm: fix data race in add_addr timer callback
- **fixed** — mptcp: pm: ADD_ADDR rtx: free sk if last
- **fixed** — mptcp: pm: ADD_ADDR rtx: always decrease sk refcount
- **fixed** — mptcp: pm: ADD_ADDR rtx: allow ID 0
- **fixed** — Input: atkbd - skip deactivate for HONOR ZQC-P
- **fixed** — Input: atkbd - skip deactivate for HONOR FMB-P's internal keyboard
- **fixed** — s390/vfio_ccw: Free all memory if cp_init() fails
- **fixed** — iomap: adjust read range correctly for non-block-aligned positions
- **fixed** — KVM: x86: Retry page fault if MMU reload is pending and root has no sp
- **fixed** — xfrm: fix sk_dst_cache double-free in xfrm_user_policy()
- **fixed** — HID: core: fix OOB read of field->usage in hid_set_field()
- **fixed** — HID: magicmouse: Prevent out-of-bounds (OOB) read during DOUBLE_REPORT_ID
- **fixed** — HID: magicmouse: do not keep a stale msc->input if no input is claimed
- **fixed** — KVM: x86: Check for invalid/obsolete root *after* making MMU pages available
- **changed** — KVM: x86/mmu: Retry page fault if root is invalidated by memslot update

77 commits in this release:

- Linux 5.15.218
- Revert "ALSA: aoa: Use guard() for mutex locks"
- HID: hyperv: validate initial device info bounds
- HID: sensor: custom: Fix use-after-free in enable_sensor
- HID: core: fix number/pointer type confusion on long items
- can: isotp: fix timer drain order, wakeup handling and tx_gen ordering
- can: use skb hash instead of private variable in headroom
- mptcp: pm: fix data race in add_addr timer callback
- mptcp: pm: ADD_ADDR rtx: free sk if last
- mptcp: pm: ADD_ADDR rtx: always decrease sk refcount
- mptcp: pm: ADD_ADDR rtx: allow ID 0
- Input: atkbd - skip deactivate for HONOR ZQC-P
- Input: atkbd - skip deactivate for HONOR FMB-P's internal keyboard
- s390/vfio_ccw: Free all memory if cp_init() fails
- iomap: adjust read range correctly for non-block-aligned positions
- KVM: x86: Retry page fault if MMU reload is pending and root has no sp
- xfrm: fix sk_dst_cache double-free in xfrm_user_policy()
- HID: core: fix OOB read of field->usage in hid_set_field()
- HID: magicmouse: Prevent out-of-bounds (OOB) read during DOUBLE_REPORT_ID
- HID: magicmouse: do not keep a stale msc->input if no input is claimed
- KVM: x86: Check for invalid/obsolete root *after* making MMU pages available
- KVM: x86/mmu: Rename __direct_map() to direct_map()
- KVM: x86/mmu: Split out TDP MMU page fault handling
- KVM: Rename mmu_notifier_* to mmu_invalidate_*
- KVM: x86/mmu: Document the "rules" for using host_pfn_mapping_level()
- KVM: x86/mmu: Rename pte_list_{destroy,remove}() to show they zap SPTEs
- KVM: x86/mmu: Directly "destroy" PTE list when recycling rmaps
- KVM: x86/mmu: Retry page fault if root is invalidated by memslot update
- ASoC: codecs: lpass-tx-macro: Fix enum kcontrol accesses
- mptcp: avoid combining some incoming suboptions
- s390/vfio_ccw: Implement a crw lock
- s390/vfio_ccw: Selectively expand io_mutex
- s390/vfio_ccw: Ensure index for read/write regions are within range
- nvmet-tcp: Do not WARN on remotely-controlled oversized SGL allocations
- nvmet-fc: fix invalid free in LS IOD error path
- ipv6: fix use-after-free in ip6_finish_output2()
- ipv4: reject undersized MTUs in ip_do_fragment()
- drm/amdgpu: check ASPM on the dGPU host link
- libceph: fix OOB read in decode_watchers() via missing bounds check
- nfc: nci: free destination parameters when closing a connection
- nfc: nci: fix uninit-value in the RF discover/activated NTF handlers
- nfc: nci: fix out-of-bounds write in nci_target_auto_activated()
- nfc: st21nfca: validate ATR_REQ length against the received frame
- nfc: pn533: purge fragmented skbs during cleanup
- nfc: llcp: reject PDUs shorter than the LLCP header
- nfc: llcp: fix OOB read and u8 offset wrap in TLV parsers
- nfc: llcp: bound the connect_sn TLV walk to the skb
- nfc: microread: validate target discovery payload lengths
- nfc: fdp: bound the device-reported read length and fix an skb leak
- nfc: digital: clamp SENSF_RES length to the destination buffer
- xfs: bounds-check buffer log item's dirty bitmap
- s390/vfio_ccw: Cancel existing workqueues
- inet: frags: publish queues before arming timer
- packet: synchronize pressure clearing with ring reconfiguration
- net/sched: reject overly deep qdisc hierarchies
- packet: use consistent hard_header_len in TX_RING send path
- packet: use consistent hard_header_len in non-ring send paths
- serial: amba-pl011: synchronize DMA teardown
- NTB: ntb_netdev: Preserve RX queue depth on allocation failure
- perf/core: Fix group leader use-after-free after sibling detach
- perf: Fix dangling cgroup pointer in cpuctx
- perf: Fix cgroup state vs ERROR
- perf/core: Fix child_total_time_enabled accounting bug at task exit
- misc: fastrpc: Remove buffer from list prior to unmap operation
- misc: fastrpc: Rework fastrpc_req_munmap
- misc: fastrpc: separate fastrpc device from channel context
- mm/huge_memory: fix huge_zero_pfn race
- gpio: ml-ioh: use raw_spinlock_t for the register lock
- xfs: validate attr entry pointe

_[Truncated at 4000 characters — full notes: https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.15.218]_