CVE-2021-47549— sata_fsl: fix UAF in sata_fsl_port_stop when rmmod sata_fsl
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I. Basic Information for CVE-2021-47549
Vulnerability Information
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Vulnerability Title
sata_fsl: fix UAF in sata_fsl_port_stop when rmmod sata_fsl
Source: NVD (National Vulnerability Database)
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: sata_fsl: fix UAF in sata_fsl_port_stop when rmmod sata_fsl When the `rmmod sata_fsl.ko` command is executed in the PPC64 GNU/Linux, a bug is reported: ================================================================== BUG: Unable to handle kernel data access on read at 0x80000800805b502c Oops: Kernel access of bad area, sig: 11 [#1] NIP [c0000000000388a4] .ioread32+0x4/0x20 LR [80000000000c6034] .sata_fsl_port_stop+0x44/0xe0 [sata_fsl] Call Trace: .free_irq+0x1c/0x4e0 (unreliable) .ata_host_stop+0x74/0xd0 [libata] .release_nodes+0x330/0x3f0 .device_release_driver_internal+0x178/0x2c0 .driver_detach+0x64/0xd0 .bus_remove_driver+0x70/0xf0 .driver_unregister+0x38/0x80 .platform_driver_unregister+0x14/0x30 .fsl_sata_driver_exit+0x18/0xa20 [sata_fsl] .__se_sys_delete_module+0x1ec/0x2d0 .system_call_exception+0xfc/0x1f0 system_call_common+0xf8/0x200 ================================================================== The triggering of the BUG is shown in the following stack: driver_detach device_release_driver_internal __device_release_driver drv->remove(dev) --> platform_drv_remove/platform_remove drv->remove(dev) --> sata_fsl_remove iounmap(host_priv->hcr_base); <---- unmap kfree(host_priv); <---- free devres_release_all release_nodes dr->node.release(dev, dr->data) --> ata_host_stop ap->ops->port_stop(ap) --> sata_fsl_port_stop ioread32(hcr_base + HCONTROL) <---- UAF host->ops->host_stop(host) The iounmap(host_priv->hcr_base) and kfree(host_priv) functions should not be executed in drv->remove. These functions should be executed in host_stop after port_stop. Therefore, we move these functions to the new function sata_fsl_host_stop and bind the new function to host_stop.
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，该漏洞源于内存释放后重用。
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
II. Public POCs for CVE-2021-47549
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Same Patch Batch · Linux · 2024-05-24 · 73 CVEs total
| CVE-2021-47547 | net: tulip: de4x5: fix the problem that the array 'lp->phy[8]' may be out of bound | |
| CVE-2021-47569 | io_uring: fail cancellation for EXITING tasks | |
| CVE-2021-47567 | powerpc/32: Fix hardlockup on vmap stack overflow | |
| CVE-2021-47554 | vdpa_sim: avoid putting an uninitialized iova_domain | |
| CVE-2021-47555 | net: vlan: fix underflow for the real_dev refcnt | |
| CVE-2021-47553 | sched/scs: Reset task stack state in bringup_cpu() | |
| CVE-2021-47551 | drm/amd/amdkfd: Fix kernel panic when reset failed and been triggered again | |
| CVE-2021-47552 | blk-mq: cancel blk-mq dispatch work in both blk_cleanup_queue and disk_release() | |
| CVE-2021-47550 | drm/amd/amdgpu: fix potential memleak | |
| CVE-2021-47548 | ethernet: hisilicon: hns: hns_dsaf_misc: fix a possible array overflow in hns_dsaf_ge_srst | |
| CVE-2021-47556 | ethtool: ioctl: fix potential NULL deref in ethtool_set_coalesce() | |
| CVE-2021-47546 | ipv6: fix memory leak in fib6_rule_suppress | |
| CVE-2021-47544 | tcp: fix page frag corruption on page fault | |
| CVE-2021-47542 | net: qlogic: qlcnic: Fix a NULL pointer dereference in qlcnic_83xx_add_rings() | |
| CVE-2021-47541 | net/mlx4_en: Fix an use-after-free bug in mlx4_en_try_alloc_resources() | |
| CVE-2021-47540 | mt76: mt7915: fix NULL pointer dereference in mt7915_get_phy_mode | |
| CVE-2021-47539 | rxrpc: Fix rxrpc_peer leak in rxrpc_look_up_bundle() | |
| CVE-2021-47538 | rxrpc: Fix rxrpc_local leak in rxrpc_lookup_peer() | |
| CVE-2021-47536 | net/smc: fix wrong list_del in smc_lgr_cleanup_early | |
| CVE-2021-47537 | octeontx2-af: Fix a memleak bug in rvu_mbox_init() |
Showing top 20 of 73 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-2021-47549
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