{
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        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nio_uring: fix use-after-free of sq-\u003ethread in __io_uring_show_fdinfo()\n\nsyzbot reports:\n\nBUG: KASAN: slab-use-after-free in getrusage+0x1109/0x1a60\nRead of size 8 at addr ffff88810de2d2c8 by task a.out/304\n\nCPU: 0 UID: 0 PID: 304 Comm: a.out Not tainted 6.16.0-rc1 #1 PREEMPT(voluntary)\nHardware name: QEMU Ubuntu 24.04 PC (i440FX + PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014\nCall Trace:\n \u003cTASK\u003e\n dump_stack_lvl+0x53/0x70\n print_report+0xd0/0x670\n ? __pfx__raw_spin_lock_irqsave+0x10/0x10\n ? getrusage+0x1109/0x1a60\n kasan_report+0xce/0x100\n ? getrusage+0x1109/0x1a60\n getrusage+0x1109/0x1a60\n ? __pfx_getrusage+0x10/0x10\n __io_uring_show_fdinfo+0x9fe/0x1790\n ? ksys_read+0xf7/0x1c0\n ? do_syscall_64+0xa4/0x260\n ? vsnprintf+0x591/0x1100\n ? __pfx___io_uring_show_fdinfo+0x10/0x10\n ? __pfx_vsnprintf+0x10/0x10\n ? mutex_trylock+0xcf/0x130\n ? __pfx_mutex_trylock+0x10/0x10\n ? __pfx_show_fd_locks+0x10/0x10\n ? io_uring_show_fdinfo+0x57/0x80\n io_uring_show_fdinfo+0x57/0x80\n seq_show+0x38c/0x690\n seq_read_iter+0x3f7/0x1180\n ? inode_set_ctime_current+0x160/0x4b0\n seq_read+0x271/0x3e0\n ? __pfx_seq_read+0x10/0x10\n ? __pfx__raw_spin_lock+0x10/0x10\n ? __mark_inode_dirty+0x402/0x810\n ? selinux_file_permission+0x368/0x500\n ? file_update_time+0x10f/0x160\n vfs_read+0x177/0xa40\n ? __pfx___handle_mm_fault+0x10/0x10\n ? __pfx_vfs_read+0x10/0x10\n ? mutex_lock+0x81/0xe0\n ? __pfx_mutex_lock+0x10/0x10\n ? fdget_pos+0x24d/0x4b0\n ksys_read+0xf7/0x1c0\n ? __pfx_ksys_read+0x10/0x10\n ? do_user_addr_fault+0x43b/0x9c0\n do_syscall_64+0xa4/0x260\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\nRIP: 0033:0x7f0f74170fc9\nCode: 00 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 \u003c48\u003e 3d 01 f0 ff ff 73 01 c3 48 8b 8\nRSP: 002b:00007fffece049e8 EFLAGS: 00000206 ORIG_RAX: 0000000000000000\nRAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f0f74170fc9\nRDX: 0000000000001000 RSI: 00007fffece049f0 RDI: 0000000000000004\nRBP: 00007fffece05ad0 R08: 0000000000000000 R09: 00007fffece04d90\nR10: 0000000000000000 R11: 0000000000000206 R12: 00005651720a1100\nR13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000\n \u003c/TASK\u003e\n\nAllocated by task 298:\n kasan_save_stack+0x33/0x60\n kasan_save_track+0x14/0x30\n __kasan_slab_alloc+0x6e/0x70\n kmem_cache_alloc_node_noprof+0xe8/0x330\n copy_process+0x376/0x5e00\n create_io_thread+0xab/0xf0\n io_sq_offload_create+0x9ed/0xf20\n io_uring_setup+0x12b0/0x1cc0\n do_syscall_64+0xa4/0x260\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\n\nFreed by task 22:\n kasan_save_stack+0x33/0x60\n kasan_save_track+0x14/0x30\n kasan_save_free_info+0x3b/0x60\n __kasan_slab_free+0x37/0x50\n kmem_cache_free+0xc4/0x360\n rcu_core+0x5ff/0x19f0\n handle_softirqs+0x18c/0x530\n run_ksoftirqd+0x20/0x30\n smpboot_thread_fn+0x287/0x6c0\n kthread+0x30d/0x630\n ret_from_fork+0xef/0x1a0\n ret_from_fork_asm+0x1a/0x30\n\nLast potentially related work creation:\n kasan_save_stack+0x33/0x60\n kasan_record_aux_stack+0x8c/0xa0\n __call_rcu_common.constprop.0+0x68/0x940\n __schedule+0xff2/0x2930\n __cond_resched+0x4c/0x80\n mutex_lock+0x5c/0xe0\n io_uring_del_tctx_node+0xe1/0x2b0\n io_uring_clean_tctx+0xb7/0x160\n io_uring_cancel_generic+0x34e/0x760\n do_exit+0x240/0x2350\n do_group_exit+0xab/0x220\n __x64_sys_exit_group+0x39/0x40\n x64_sys_call+0x1243/0x1840\n do_syscall_64+0xa4/0x260\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\n\nThe buggy address belongs to the object at ffff88810de2cb00\n which belongs to the cache task_struct of size 3712\nThe buggy address is located 1992 bytes inside of\n freed 3712-byte region [ffff88810de2cb00, ffff88810de2d980)\n\nwhich is caused by the task_struct pointed to by sq-\u003ethread being\nreleased while it is being used in the function\n__io_uring_show_fdinfo(). Holding ctx-\u003euring_lock does not prevent ehre\nrelase or exit of sq-\u003ethread.\n\nFix this by assigning and looking up -\u003ethread under RCU, and grabbing a\nreference to the task_struct. This e\n---truncated---"
        }
      ],
      "metrics": [
        {
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            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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              "value": "AV:L - The bug is reached through local syscalls only \u2014 `io_uring_setup()` to create the SQPOLL ring and `read()` on `/proc/\u003cpid\u003e/fdinfo/\u003cfd\u003e`. No network or adjacent-network exposure exists for io_uring fdinfo.\nAC:L - The attacker owns both sides of the race: it creates the SQPOLL ring, decides when the SQPOLL thread exits (ring close or owner exit), and loops on fdinfo reads concurrently; the RCU-delayed `task_struct` free widens the reclaim window and a syzkaller reproducer exists.\nPR:L - Creating an `IORING_SETUP_SQPOLL` ring requires no capability (only the `security_uring_sqpoll()` LSM hook), and reading one\u0027s own `/proc/self/fdinfo/\u003cfd\u003e` passes the PTRACE_MODE_READ check, so any unprivileged local user qualifies.\nUI:N - The attacking process performs every step itself \u2014 ring setup, thread teardown, and the fdinfo read \u2014 with no action by any other user or victim process.\nS:U - The corruption and its consequences stay within the kernel\u0027s own security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - Use-after-free on a `task_struct` whose contents the attacker can groom via slab reuse; `getrusage()` then reads through the stale `p-\u003esignal` and thread list at controlled offsets and the harvested kernel values are printed back to userspace in the fdinfo output.\nI:H - The stale pointer drives writes \u2014 `read_seqbegin_or_lock_irqsave()` acquires the seqlock\u0027s spinlock and `get_task_mm()` performs an atomic increment through attacker-influenced pointers \u2014 giving corruption primitives suitable for escalation to control-flow hijack after heap spraying.\nA:H - Dereferencing a freed `task_struct` and walking its thread list reliably oopses or panics the kernel, and the read can be repeated in a loop by any local user."
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          "url": "https://git.kernel.org/stable/c/ac0b8b327a5677dc6fecdf353d808161525b1ff0"
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      "title": "io_uring: fix use-after-free of sq-\u003ethread in __io_uring_show_fdinfo()",
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    "dateReserved": "2025-04-16T04:51:23.985Z",
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        "title": "CISA ADP Vulnrichment"
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        {
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          "product": "Linux",
          "programFiles": [
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          "vendor": "Linux",
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndm: fix dm_blk_report_zones\n\nIf dm_get_live_table() returned NULL, dm_put_live_table() was never\ncalled. Also, it is possible that md-\u003ezone_revalidate_map will change\nwhile calling this function. Only read it once, so that we are always\nusing the same value. Otherwise we might miss a call to\ndm_put_live_table().\n\nFinally, while md-\u003ezone_revalidate_map is set and a process is calling\nblk_revalidate_disk_zones() to set up the zone append emulation\nresources, it is possible that another process, perhaps triggered by\nblkdev_report_zones_ioctl(), will call dm_blk_report_zones(). If\nblk_revalidate_disk_zones() fails, these resources can be freed while\nthe other process is still using them, causing a use-after-free error.\n\nblk_revalidate_disk_zones() will only ever be called when initially\nsetting up the zone append emulation resources, such as when setting up\na zoned dm-crypt table for the first time. Further table swaps will not\nset md-\u003ezone_revalidate_map or call blk_revalidate_disk_zones().\nHowever it must be called using the new table (referenced by\nmd-\u003ezone_revalidate_map) and the new queue limits while the DM device is\nsuspended. dm_blk_report_zones() needs some way to distinguish between a\ncall from blk_revalidate_disk_zones(), which must be allowed to use\nmd-\u003ezone_revalidate_map to access this not yet activated table, and all\nother calls to dm_blk_report_zones(), which should not be allowed while\nthe device is suspended and cannot use md-\u003ezone_revalidate_map, since\nthe zone resources might be freed by the process currently calling\nblk_revalidate_disk_zones().\n\nSolve this by tracking the process that sets md-\u003ezone_revalidate_map in\ndm_revalidate_zones() and only allowing that process to make use of it\nin dm_blk_report_zones()."
        }
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              "lang": "en",
              "value": "AV:L - The vulnerable function is reached through the BLKREPORTZONE/BLKREPORTZONEV2 ioctl on a device-mapper block device node (blkdev_common_ioctl \u2192 blkdev_report_zones_ioctl \u2192 blkdev_report_zones \u2192 dm_blk_report_zones), i.e. a local syscall on a local device file. No network or remote peer data is involved.\nAC:L - The attacker fully controls their side of the race and can spin the ioctl at thousands of calls per second, while the vulnerable window \u2014 a whole-device zone revalidation on an SMR/ZNS device plus the entire DM_TABLE_LOAD-to-resume gap where md-\u003emap is NULL \u2014 is wide and recurs on every zoned DM table setup, so no condition outside the attacker\u0027s influence has to fall into place.\nPR:L - BLKREPORTZONE is handled in blkdev_common_ioctl() with no capable() check and without requiring FMODE_WRITE, so any local user able to open the DM device read-only (disk-group member, container with the device exposed, or an unprivileged process on an embedded/Android zoned-storage system) can drive the ioctl loop.\nUI:N - The attacker only needs to loop on the ioctl; the zone revalidation and the loaded-but-unresumed table state occur automatically during normal device setup at boot, hotplug, or storage-daemon activity, with no victim action required.\nS:U - The use-after-free, out-of-bounds per-CPU increment, and hang are all confined to the kernel\u0027s own security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - A racing report walks a dm_table freed by dm_table_destroy() and zone resources freed by disk_free_zone_resources(), reading freed struct dm_target/dm_table contents and returning the resulting zone descriptors to userspace via blkdev_copy_zone_to_user(), and the SRCU counter imbalance from the garbage srcu_idx lets grace periods end early and expose further freed objects.\nI:H - dm_blk_do_report_zones() loads and calls tgt-\u003etype-\u003ereport_zones out of a freed dm_table, giving a control-flow hijack primitive once the slab is reclaimed, and srcu_read_unlock() with an uninitialized stack index performs an out-of-bounds this_cpu_inc() past srcu_ctrs[] into adjacent per-CPU memory.\nA:H - The missing dm_put_live_table() permanently leaks an SRCU read-side critical section, so every later synchronize_srcu(\u0026md-\u003eio_barrier) \u2014 table swap, suspend, or device removal \u2014 blocks forever in an unkillable D state while holding md-\u003esuspend_lock, wedging dmsetup; independently, the use-after-free on the freed table produces an oops or panic."
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          "url": "https://git.kernel.org/stable/c/37f53a2c60d03743e0eacf7a0c01c279776fef4e"
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      "title": "dm: fix dm_blk_report_zones",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2025-38141",
    "datePublished": "2025-07-03T08:35:42.787Z",
    "dateReserved": "2025-04-16T04:51:23.987Z",
    "dateUpdated": "2026-08-05T11:59:51.188Z",
    "state": "PUBLISHED"
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          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/gpu/drm/xe/xe_guc_exec_queue_types.h",
            "drivers/gpu/drm/xe/xe_guc_submit.c",
            "drivers/gpu/drm/xe/xe_hw_fence.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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              "value": "AV:L - The vulnerable code is in a PCI HID driver\u0027s system-suspend callback, reachable only from the local machine by triggering a suspend (logind/systemctl suspend, lid close, or idle timeout). There is no network or remote-peer input path to `thc_i2c_subip_regs_save()`.\nAC:L - The bad pointer arithmetic is unconditional \u2014 every single suspend on affected Intel THC I2C hardware writes 60 bytes at the wrong address, ~40 of them past the end of the slab object, with no race or timing dependency. Heap grooming to place a chosen victim object in the adjacent kmalloc-192 slot is standard and under attacker control.\nPR:L - An unprivileged local user with an active session can initiate system suspend via systemd-logind, which default polkit policy grants to active local sessions without root. No CAP_SYS_ADMIN or `/sys/power/state` write access is needed, and the path is additionally reached by automatic idle suspend.\nUI:N - The attacker triggers the suspend themselves; no separate victim needs to take any action. The bug also fires on unattended idle or lid-close suspend with no user involvement at all.\nS:U - The out-of-bounds write corrupts kernel slab memory within the same kernel security authority. No VM, IOMMU, or sandbox boundary is crossed.\nC:H - The restore path performs a matching ~40-byte out-of-bounds read of the adjacent heap object and pushes it into hardware registers, and the OOB write can corrupt a groomed neighbouring object\u0027s length or pointer fields to yield an arbitrary-read primitive. Per kernel guidance, unbounded OOB access and memory corruption leverageable for disclosure score High.\nI:H - This is a slab out-of-bounds write of roughly 40 bytes past the allocation into an adjacent heap object, which also silently corrupts `struct thc_device`\u0027s own tail fields including the `i2c_subip_regs` pointer. Out-of-bounds heap writes are scored High because heap grooming can direct the corruption at security-relevant fields.\nA:H - The commit message and KASAN trace explicitly document a kernel crash from this out-of-bounds write, and it recurs on every suspend cycle. Corruption of the adjacent slab object plus programming garbage into live I2C controller registers on resume also renders the touch input device inoperable."
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              "value": "AV:L - The vulnerability is reached through the GPIO character device `/dev/gpiochipN` via `open()`, `ioctl()` and `close()`, requiring local access to the system. There is no network-facing path to the GPIO line-state notifier chain.\nAC:L - The attacker controls both sides of the race \u2014 one thread loops open/`GPIO_V2_GET_LINEINFO_WATCH_IOCTL`/close while another loops line request/release/set-config to fire `gpiod_line_state_notify()` \u2014 and can retry indefinitely; the fput-to-release window can additionally be stretched to a full jiffy by forcing the `schedule_delayed_work(\u0026delayed_fput_work, 1)` path, and the reporter hit the condition during normal operation.\nPR:L - No capability check exists anywhere in `gpio_chrdev_open()` or `gpio_ioctl()` \u2014 only file permissions on `/dev/gpiochipN`, which embedded, IoT, automotive and Raspberry-Pi-class deployments routinely grant to a non-root `gpio` group or to unprivileged libgpiod control daemons. A basic unprivileged local account with that group membership is sufficient.\nUI:N - The attacker performs every step itself \u2014 opening the chardev, arming the line watch, generating the line-state change, and closing the fd. No victim action or cooperation is needed.\nS:U - The use-after-free corrupts kernel heap memory within the same kernel security authority; there is no crossing of a VM, IOMMU, or sandbox boundary.\nC:H - This is a use-after-free on both the `struct file` and the ~9.4 KB `gpio_chardev_data` object; a resprayed `cdev` lets `kfifo_in_spinlocked()` and `fput(cdev-\u003efp)` read through attacker-chosen pointers, and `wake_up_poll()` on the freed wait queue yields a controlled call primitive, enabling arbitrary kernel memory disclosure.\nI:H - The queued work writes a 288-byte event record (with an attacker-supplied 32-byte consumer label) through the freed object\u0027s kfifo `data` pointer and performs a refcount decrement through a dangling `struct file *`, giving arbitrary-write and function-pointer-hijack primitives suitable for privilege escalation.\nA:H - In the common case the bug produces a `refcount_t` WARN (\"f_count incremented from zero; use-after-free condition present!\") \u2014 an immediate panic under `panic_on_warn` \u2014 followed by use-after-free accesses to a freed spinlock, kfifo and wait queue that reliably oops or panic the kernel, and the sequence is repeatable at will."
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmigrate: correct lock ordering for hugetlb file folios\n\nSyzbot has found a deadlock (analyzed by Lance Yang):\n\n1) Task (5749): Holds folio_lock, then tries to acquire i_mmap_rwsem(read lock).\n2) Task (5754): Holds i_mmap_rwsem(write lock), then tries to acquire\nfolio_lock.\n\nmigrate_pages()\n  -\u003e migrate_hugetlbs()\n    -\u003e unmap_and_move_huge_page()     \u003c- Takes folio_lock!\n      -\u003e remove_migration_ptes()\n        -\u003e __rmap_walk_file()\n          -\u003e i_mmap_lock_read()       \u003c- Waits for i_mmap_rwsem(read lock)!\n\nhugetlbfs_fallocate()\n  -\u003e hugetlbfs_punch_hole()           \u003c- Takes i_mmap_rwsem(write lock)!\n    -\u003e hugetlbfs_zero_partial_page()\n     -\u003e filemap_lock_hugetlb_folio()\n      -\u003e filemap_lock_folio()\n        -\u003e __filemap_get_folio        \u003c- Waits for folio_lock!\n\nThe migration path is the one taking locks in the wrong order according to\nthe documentation at the top of mm/rmap.c.  So expand the scope of the\nexisting i_mmap_lock to cover the calls to remove_migration_ptes() too.\n\nThis is (mostly) how it used to be after commit c0d0381ade79.  That was\nremoved by 336bf30eb765 for both file \u0026 anon hugetlb pages when it should\nonly have been removed for anon hugetlb pages."
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