CVE-2021-46959— spi: Fix use-after-free with devm_spi_alloc_*
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I. Basic Information for CVE-2021-46959
Vulnerability Information
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Vulnerability Title
spi: Fix use-after-free with devm_spi_alloc_*
Source: NVD (National Vulnerability Database)
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: spi: Fix use-after-free with devm_spi_alloc_* We can't rely on the contents of the devres list during spi_unregister_controller(), as the list is already torn down at the time we perform devres_find() for devm_spi_release_controller. This causes devices registered with devm_spi_alloc_{master,slave}() to be mistakenly identified as legacy, non-devm managed devices and have their reference counters decremented below 0. ------------[ cut here ]------------ WARNING: CPU: 1 PID: 660 at lib/refcount.c:28 refcount_warn_saturate+0x108/0x174 [<b0396f04>] (refcount_warn_saturate) from [<b03c56a4>] (kobject_put+0x90/0x98) [<b03c5614>] (kobject_put) from [<b0447b4c>] (put_device+0x20/0x24) r4:b6700140 [<b0447b2c>] (put_device) from [<b07515e8>] (devm_spi_release_controller+0x3c/0x40) [<b07515ac>] (devm_spi_release_controller) from [<b045343c>] (release_nodes+0x84/0xc4) r5:b6700180 r4:b6700100 [<b04533b8>] (release_nodes) from [<b0454160>] (devres_release_all+0x5c/0x60) r8:b1638c54 r7:b117ad94 r6:b1638c10 r5:b117ad94 r4:b163dc10 [<b0454104>] (devres_release_all) from [<b044e41c>] (__device_release_driver+0x144/0x1ec) r5:b117ad94 r4:b163dc10 [<b044e2d8>] (__device_release_driver) from [<b044f70c>] (device_driver_detach+0x84/0xa0) r9:00000000 r8:00000000 r7:b117ad94 r6:b163dc54 r5:b1638c10 r4:b163dc10 [<b044f688>] (device_driver_detach) from [<b044d274>] (unbind_store+0xe4/0xf8) Instead, determine the devm allocation state as a flag on the controller which is guaranteed to be stable during cleanup.
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 devm_spi_alloc_* 存在释放后重用问题。
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
II. Public POCs for CVE-2021-46959
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Same Patch Batch · Linux · 2024-02-29 · 53 CVEs total
| CVE-2021-47020 | soundwire: stream: fix memory leak in stream config error path | |
| CVE-2021-47068 | net/nfc: fix use-after-free llcp_sock_bind/connect | |
| CVE-2021-47067 | soc/tegra: regulators: Fix locking up when voltage-spread is out of range | |
| CVE-2021-47062 | KVM: SVM: Use online_vcpus, not created_vcpus, to iterate over vCPUs | |
| CVE-2021-47065 | rtw88: Fix array overrun in rtw_get_tx_power_params() | |
| CVE-2021-47064 | mt76: fix potential DMA mapping leak | |
| CVE-2021-47063 | drm: bridge/panel: Cleanup connector on bridge detach | |
| CVE-2021-47066 | async_xor: increase src_offs when dropping destination page | |
| CVE-2021-47055 | mtd: require write permissions for locking and badblock ioctls | |
| CVE-2021-47054 | bus: qcom: Put child node before return | |
| CVE-2021-47056 | crypto: qat - ADF_STATUS_PF_RUNNING should be set after adf_dev_init | |
| CVE-2021-47016 | m68k: mvme147,mvme16x: Don't wipe PCC timer config bits | |
| CVE-2024-26620 | s390/vfio-ap: always filter entire AP matrix | |
| CVE-2024-26619 | riscv: Fix module loading free order | |
| CVE-2024-26618 | arm64/sme: Always exit sme_alloc() early with existing storage | |
| CVE-2024-26617 | fs/proc/task_mmu: move mmu notification mechanism inside mm lock | |
| CVE-2024-26616 | btrfs: scrub: avoid use-after-free when chunk length is not 64K aligned | |
| CVE-2024-26615 | net/smc: fix illegal rmb_desc access in SMC-D connection dump | |
| CVE-2024-26614 | tcp: make sure init the accept_queue's spinlocks once | |
| CVE-2024-26612 | netfs, fscache: Prevent Oops in fscache_put_cache() |
Showing top 20 of 53 CVEs. View all on vendor page → →
IV. Related Vulnerabilities
Same product: Linux
- CVE-2026-43500
rxrpc: Also unshare DATA/RESPONSE packets when paged frags a - CVE-2026-43475
scsi: storvsc: Fix scheduling while atomic on PREEMPT_RT - CVE-2026-43474
fs: init flags_valid before calling vfs_fileattr_get - CVE-2026-43473
scsi: mpi3mr: Add NULL checks when resetting request and rep - CVE-2026-43472
unshare: fix unshare_fs() handling
Same vendor: Linux
- CVE-2026-43500
rxrpc: Also unshare DATA/RESPONSE packets when paged frags a - CVE-2026-43475
scsi: storvsc: Fix scheduling while atomic on PREEMPT_RT - CVE-2026-43474
fs: init flags_valid before calling vfs_fileattr_get - CVE-2026-43473
scsi: mpi3mr: Add NULL checks when resetting request and rep - CVE-2026-43472
unshare: fix unshare_fs() handling
V. Comments for CVE-2021-46959
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