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CVE-2024-56693— brd: defer automatic disk creation until module initialization succeeds

EPSS 0.03% · P8

Affected Version Matrix 14

VendorProductVersion RangeStatus
LinuxLinux7f9b348cb5e94259acdcbafbcaed55d3bb515304< 41219c147df8bbd6591f59af5d695fb6c9a1cbffaffected
7f9b348cb5e94259acdcbafbcaed55d3bb515304< 259bf925583ec9e3781df778cadf00594095090daffected
7f9b348cb5e94259acdcbafbcaed55d3bb515304< 410896624db639500f24f46478b4bfa05c76bf56affected
7f9b348cb5e94259acdcbafbcaed55d3bb515304< c0c2744cd2939ec5999c51dbaf2af16886548b7baffected
7f9b348cb5e94259acdcbafbcaed55d3bb515304< 63dfd728b30f79495dacc886127695a379805152affected
7f9b348cb5e94259acdcbafbcaed55d3bb515304< 826cc42adf44930a633d11a5993676d85ddb0842affected
5.14affected
< 5.14unaffected
… +6 more rows
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I. Basic Information for CVE-2024-56693

Vulnerability Information
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Vulnerability Title
brd: defer automatic disk creation until module initialization succeeds
Source: NVD (National Vulnerability Database)
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: brd: defer automatic disk creation until module initialization succeeds My colleague Wupeng found the following problems during fault injection: BUG: unable to handle page fault for address: fffffbfff809d073 PGD 6e648067 P4D 123ec8067 PUD 123ec4067 PMD 100e38067 PTE 0 Oops: Oops: 0000 [#1] PREEMPT SMP KASAN NOPTI CPU: 5 UID: 0 PID: 755 Comm: modprobe Not tainted 6.12.0-rc3+ #17 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.1-2.fc37 04/01/2014 RIP: 0010:__asan_load8+0x4c/0xa0 ... Call Trace: <TASK> blkdev_put_whole+0x41/0x70 bdev_release+0x1a3/0x250 blkdev_release+0x11/0x20 __fput+0x1d7/0x4a0 task_work_run+0xfc/0x180 syscall_exit_to_user_mode+0x1de/0x1f0 do_syscall_64+0x6b/0x170 entry_SYSCALL_64_after_hwframe+0x76/0x7e loop_init() is calling loop_add() after __register_blkdev() succeeds and is ignoring disk_add() failure from loop_add(), for loop_add() failure is not fatal and successfully created disks are already visible to bdev_open(). brd_init() is currently calling brd_alloc() before __register_blkdev() succeeds and is releasing successfully created disks when brd_init() returns an error. This can cause UAF for the latter two case: case 1: T1: modprobe brd brd_init brd_alloc(0) // success add_disk disk_scan_partitions bdev_file_open_by_dev // alloc file fput // won't free until back to userspace brd_alloc(1) // failed since mem alloc error inject // error path for modprobe will release code segment // back to userspace __fput blkdev_release bdev_release blkdev_put_whole bdev->bd_disk->fops->release // fops is freed now, UAF! case 2: T1: T2: modprobe brd brd_init brd_alloc(0) // success open(/dev/ram0) brd_alloc(1) // fail // error path for modprobe close(/dev/ram0) ... /* UAF! */ bdev->bd_disk->fops->release Fix this problem by following what loop_init() does. Besides, reintroduce brd_devices_mutex to help serialize modifications to brd_list.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于HID:wacom模块中设备产品名称报告不正确，导致空指针取消引用。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
LinuxLinux 7f9b348cb5e94259acdcbafbcaed55d3bb515304 ~ 41219c147df8bbd6591f59af5d695fb6c9a1cbff -
LinuxLinux 5.14 -

II. Public POCs for CVE-2024-56693

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III. Intelligence Information for CVE-2024-56693

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Same Patch Batch · Linux · 2024-12-28 · 32 CVEs total

CVE-2024-56692f2fs: fix to do sanity check on node blkaddr in truncate_node()
CVE-2024-56708EDAC/igen6: Avoid segmentation fault on module unload
CVE-2024-56707octeontx2-pf: handle otx2_mbox_get_rsp errors in otx2_dmac_flt.c
CVE-2024-56705media: atomisp: Add check for rgby_data memory allocation failure
CVE-2024-56706s390/cpum_sf: Fix and protect memory allocation of SDBs with mutex
CVE-2024-567049p/xen: fix release of IRQ
CVE-2024-56703ipv6: Fix soft lockups in fib6_select_path under high next hop churn
CVE-2024-56701powerpc/pseries: Fix dtl_access_lock to be a rw_semaphore
CVE-2024-56702bpf: Mark raw_tp arguments with PTR_MAYBE_NULL
CVE-2024-56700media: wl128x: Fix atomicity violation in fmc_send_cmd()
CVE-2024-56699s390/pci: Fix potential double remove of hotplug slot
CVE-2024-56698usb: dwc3: gadget: Fix looping of queued SG entries
CVE-2024-56697drm/amdgpu: Fix the memory allocation issue in amdgpu_discovery_get_nps_info()
CVE-2024-56696ALSA: core: Fix possible NULL dereference caused by kunit_kzalloc()
CVE-2024-56694bpf: fix recursive lock when verdict program return SK_PASS
CVE-2024-56695drm/amdkfd: Use dynamic allocation for CU occupancy array in 'kfd_get_cu_occupancy()'
CVE-2024-56676thermal: testing: Initialize some variables annoteded with _free()
CVE-2024-56691mfd: intel_soc_pmic_bxtwc: Use IRQ domain for USB Type-C device
CVE-2024-56689PCI: endpoint: epf-mhi: Avoid NULL dereference if DT lacks 'mmio'
CVE-2024-56690crypto: pcrypt - Call crypto layer directly when padata_do_parallel() return -EBUSY

Showing top 20 of 32 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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