In the Linux kernel, the following vulnerability has been resolved:
bpf: Fix mmap_lock deadlock on arena lock failure
Reported by the Sashiko AI review.
arena_vm_fault() returns VM_FAULT_RETRY when it can't take
arena->spinlock, but it never took mmap_lock. The fault path assumes a
VM_FAULT_RETRY handler already dropped mmap_lock and re-takes it on the
retry, so mmap_lock gets taken twice and can deadlock:
do_user_addr_fault()
{
fault = handle_mm_fault(...); // calls arena_vm_fault()
if (fault & VM_FAULT_RETRY)
goto retry; // re-locks mmap_lock
mmap_read_unlock(mm);
}
Return VM_FAULT_SIGBUS instead, for two reasons:
1. W
In the Linux kernel, the following vulnerability has been resolved:
firmware: coreboot: Validate table bounds
The existing coreboot_table_populate() bounds checks limit individual
entries to the mapped length. However, coreboot_table_probe() replaces
the platform resource length with header and table sizes supplied by
firmware before mapping the full table.
A malformed table can overflow the 32-bit size addition or advertise an
extent beyond the resource, causing the driver to map and parse memory
outside the resource. A resource shorter than the fixed header is also
mapped as though it contained a complete header.
Reject resources shor
serial: amba-pl011: keep console clock enabled for atomic writes
In the Linux kernel, the following vulnerability has been resolved:
serial: amba-pl011: keep console clock enabled for atomic writes
pl011_console_write_atomic() runs from nbcon atomic context, where
sleeping is not allowed. It calls clk_enable(), which takes the common-clk
enable_lock. Under PREEMPT_RT that is a sleeping lock:
clk_enable_lock() first tries spin_trylock_irqsave(), but on contention
falls back to spin_lock_irqsave(). Therefore, an atomic-context printk on
an RT kernel with a clk-backed pl011 can trip:
BUG: sleeping function called from invalid context at spinlock_rt.c:48
__might_resched from rt_spin_lock
rt_spin_l
serial: core: do fallible allocations before the console can be registered
In the Linux kernel, the following vulnerability has been resolved:
serial: core: do fallible allocations before the console can be registered
serial_core_add_one_port() allocates uport->tty_groups after
uart_configure_port(), which may register the console. If the allocation
fails, the driver unwinds the port while its console remains registered.
The earlier uport->name allocation has a related failure path that leaves
state->uart_port linked to a port being freed.
Failslab reproduced a NULL dereference in PL011 console output and a KASAN
use-after-free in i.MX console output after failed binds.
Allocate the name and tty_groups before li
serial: core: clear freed pointers on uart_register_driver() failure
In the Linux kernel, the following vulnerability has been resolved:
serial: core: clear freed pointers on uart_register_driver() failure
uart_register_driver() leaves drv->state pointing to freed memory when
tty_alloc_driver() fails. If tty_register_driver() fails, drv->tty_driver
also retains a pointer after its reference is dropped.
Drivers that use drv->state as an "already registered" flag can then skip
registration on the next probe and pass the freed state to
uart_add_one_port().
This issue was found with failslab on QEMU's raspi1ap board by
failing registration and binding the PL011 port again.
Clear both pointers on their failure
In the Linux kernel, the following vulnerability has been resolved:
tty: skip cdev_del() when no cdev is registered
TTY device registration can fail before a cdev is allocated.
Serial core keeps the port so setserial can still use it, and later
removal passes the NULL cdev slot to cdev_del(), causing a NULL-pointer
dereference.
Only delete the cdev when the slot is not NULL.
In the Linux kernel, the following vulnerability has been resolved:
tty: clear cdev pointer after cdev_add() failure
tty_cdev_add() drops the cdev reference when cdev_add() fails, but
leaves driver->cdevs[index] pointing to freed memory.
tty_unregister_device() later passes that stale pointer to cdev_del(),
causing a use-after-free.
Clear the slot after dropping the reference.
dm-integrity: replace forgeable discard filler with a keyed sector marker
In the Linux kernel, the following vulnerability has been resolved:
dm-integrity: replace forgeable discard filler with a keyed sector marker
The discard-block check in dm_integrity_rw_tag() treats a stored tag
of all 0xf6 bytes (DISCARD_FILLER) as proof a block was discarded and
skips HMAC verification. allow_discards is only accepted in
dm-integrity's standalone mode. An attacker with raw write access to
the backing device, but without the integrity key, can stamp any block
with an all-0xf6 tag and have it served as authentic.
Add a new "allow_discards_keyed" target argument that marks discarded
blocks with a keyed checksum of (salt || s
PCI: dwc: ep: Flush cached MSI write before unmapping the iATU
In the Linux kernel, the following vulnerability has been resolved:
PCI: dwc: ep: Flush cached MSI write before unmapping the iATU
The MSI-X path already flushes any posted MSI-X write before tearing down
its iATU mapping. That was added by commit c22533c66cca ("PCI: dwc: ep:
Flush MSI-X write before unmapping its ATU entry") to make sure the write
reaches the Root Complex before the outbound window that translates it
disappears.
The MSI path has the same problem but no equivalent flush. When the
Endpoint driver caches an MSI target address and later observes that the
Root Complex has changed it, dw_pcie_ep_raise_msi_irq() unmaps the exist
HID: asus: refactor the two workqueues and init sequence
In the Linux kernel, the following vulnerability has been resolved:
HID: asus: refactor the two workqueues and init sequence
Multiple issues have been found within the hid-asus driver:
- unchecked size in asus_raw_event()
- unclean teardown of asus_probe on failure
- possible use-after-free in asus_probe
- multiple workqueue used for jobs where one was enough
- sleeping calls in atomic context
- packets of incorrect size being sent to the keyboard controller
Join the two workqueues into one reusing the stopping mechanism
of the brightness workqueue, use the joined workqueue to also
move the asus_wmi_send_event() sleeping call away from ato
HID: logitech-hidpp: Fix FF device cleanup on init failure
In the Linux kernel, the following vulnerability has been resolved:
HID: logitech-hidpp: Fix FF device cleanup on init failure
hidpp_ff_init() creates the input force-feedback device with
input_ff_create(), then allocates the HID++ FF private data,
effect ID array, and workqueue.
If any of those allocations fail after input_ff_create() succeeds,
the function returns an error without destroying the FF device.
Add an unwind path that frees the private allocations made by
hidpp_ff_init() and calls input_ff_destroy() for failures after
input_ff_create() succeeds.
HID: synchronize input before cleaning up a failed probe
In the Linux kernel, the following vulnerability has been resolved:
HID: synchronize input before cleaning up a failed probe
hid_device_io_start() allows reports to run concurrently with probe. If
the probe subsequently fails, __hid_device_probe() releases driver
resources and clears hdev->driver without first excluding those report
callbacks.
For example, a report may enter hidraw_report_event() while the failure
path frees the associated hidraw object, leading to a use-after-free when
the report takes the object's list lock.
Stop input before performing failed-probe cleanup. This reacquires
driver_input_lock and waits for any report cal
In the Linux kernel, the following vulnerability has been resolved:
HID: steam: Reject short reads
Steam Controller FEATURE reports encode the size of the message in the
message itself. Previously we were trusting that the size reported matched
the size we actually read, leading to a potential issue with short reads.
Instead, we should actually verify the length of the read.
phonet: pep: do not write beyond optlen in getsockopt
In the Linux kernel, the following vulnerability has been resolved:
phonet: pep: do not write beyond optlen in getsockopt
pep_getsockopt() clamps the reported length to the caller's buffer with
min_t(), but then stores the value with put_user(val, (int __user *)
optval), which always writes sizeof(int) bytes. A getsockopt() call with
an optlen smaller than sizeof(int) thus reports the clamped length yet
writes a full int, one to three bytes past the user buffer.
Write the value with copy_to_user() bounded by len, so at most optlen
bytes are copied, matching the length reported back to userspace.
blk-cgroup: fix race between policy activation and blkg destruction
In the Linux kernel, the following vulnerability has been resolved:
blk-cgroup: fix race between policy activation and blkg destruction
When switching an IO scheduler on a block device, blkcg_activate_policy()
allocates blkg_policy_data (pd) for all blkgs attached to the queue.
However, blkcg_activate_policy() may race with concurrent blkcg deletion,
leading to use-after-free and memory leak issues.
The use-after-free occurs in the following race:
T1 (blkcg_activate_policy):
- Successfully allocates pd for blkg1 (loop0->queue, blkcgA)
- Fails to allocate pd for blkg2 (loop0->queue, blkcgB)
- Enters the enomem rollback path to releas
blk-cgroup: skip dying blkg in blkcg_activate_policy()
In the Linux kernel, the following vulnerability has been resolved:
blk-cgroup: skip dying blkg in blkcg_activate_policy()
When switching IO schedulers on a block device, blkcg_activate_policy()
can race with concurrent blkcg deletion, leading to a use-after-free in
rcu_accelerate_cbs.
T1: T2:
blkg_destroy
kill(&blkg->refcnt) // blkg->refcnt=1->0
blkg_release // call_rcu(__blkg_release)
...
blkg_free_workfn
->
In the Linux kernel, the following vulnerability has been resolved:
ublk: check import_ubuf() return value
import_ubuf() can fail if the address range (provided by the userspace
ublk server) is outside the allowed user address space. Return that 0
bytes were copied if import_ubuf() fails rather than passing an
uninitialized struct iov_iter to ublk_copy_user_pages().
ublk: validate auto buf reg before taking uring_cmd
In the Linux kernel, the following vulnerability has been resolved:
ublk: validate auto buf reg before taking uring_cmd
With UBLK_F_AUTO_BUF_REG, invalid sqe->addr can fail after
ublk_fill_io_cmd() has set UBLK_IO_FLAG_ACTIVE. The uring_cmd is
completed while the tag stays active, which can hang teardown.
Split validation from buffer apply so the check has no side effects,
then take the uring_cmd and store the already-validated buffer. Apply
the same order in FETCH so io->buf is not written before __ublk_fetch()
state checks.
In the Linux kernel, the following vulnerability has been resolved:
ocfs2/cluster: keep heartbeat local node stable
o2nm_node_local_store() handles local=0 by stopping o2net and setting
cl_local_node to O2NM_INVALID_NODE_NUM, but it leaves cl_has_local set.
That stale state makes o2nm_this_node() return 255, blocks a later local=1
attempt with -EBUSY, and can feed 255 to heartbeat users that call
o2nm_this_node() dynamically.
Clearing cl_has_local is required when the local node is reset. But
heartbeat threads can still be running at that point. They pin the local
node config item at startup, yet o2hb_do_disk_heartbeat() and thread
tear
ocfs2: validate inline xattrs during inode block validation
In the Linux kernel, the following vulnerability has been resolved:
ocfs2: validate inline xattrs during inode block validation
Patch series "ocfs2: validate xattr entry bounds", v7.
This series validates OCFS2 xattr entry name/value bounds when xattr
metadata is read and validated, before getxattr() or listxattr() can walk
out-of-range entry arrays or offsets from corrupted metadata.
This patch (of 2):
ocfs2_validate_inode_block() verifies a dinode before OCFS2 users walk
metadata from it, but inline xattr metadata is still checked only in
operation-specific consumers. The existing ibody lookup helper validates
inline header placement