CVE-2021-47191— scsi: scsi_debug: Fix out-of-bound read in resp_readcap16()
Possible ATT&CK Techniques 3AI
T1059 · Command and Scripting Interpreter T1068 · Exploitation for Privilege Escalation T1203 · Exploitation for Client ExecutionAffected Version Matrix 8
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Linux | Linux | c65b1445d153a66ca91b00c1f10187e495c17918< 3e20cb072679bdb47747ccc8bee3233a4cf0765a | affected |
c65b1445d153a66ca91b00c1f10187e495c17918< 5b8bed6464ad6653586e30df046185fd816ad999 | affected | ||
c65b1445d153a66ca91b00c1f10187e495c17918< 4e3ace0051e7e504b55d239daab8789dd89b863c | affected | ||
2.6.18 | affected | ||
< 2.6.18 | unaffected | ||
5.10.82≤ 5.10.* | unaffected | ||
5.15.5≤ 5.15.* | unaffected | ||
5.16≤ * | unaffected |
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I. Basic Information for CVE-2021-47191
Vulnerability Information
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Vulnerability Title
scsi: scsi_debug: Fix out-of-bound read in resp_readcap16()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: scsi: scsi_debug: Fix out-of-bound read in resp_readcap16() The following warning was observed running syzkaller: [ 3813.830724] sg_write: data in/out 65466/242 bytes for SCSI command 0x9e-- guessing data in; [ 3813.830724] program syz-executor not setting count and/or reply_len properly [ 3813.836956] ================================================================== [ 3813.839465] BUG: KASAN: stack-out-of-bounds in sg_copy_buffer+0x157/0x1e0 [ 3813.841773] Read of size 4096 at addr ffff8883cf80f540 by task syz-executor/1549 [ 3813.846612] Call Trace: [ 3813.846995] dump_stack+0x108/0x15f [ 3813.847524] print_address_description+0xa5/0x372 [ 3813.848243] kasan_report.cold+0x236/0x2a8 [ 3813.849439] check_memory_region+0x240/0x270 [ 3813.850094] memcpy+0x30/0x80 [ 3813.850553] sg_copy_buffer+0x157/0x1e0 [ 3813.853032] sg_copy_from_buffer+0x13/0x20 [ 3813.853660] fill_from_dev_buffer+0x135/0x370 [ 3813.854329] resp_readcap16+0x1ac/0x280 [ 3813.856917] schedule_resp+0x41f/0x1630 [ 3813.858203] scsi_debug_queuecommand+0xb32/0x17e0 [ 3813.862699] scsi_dispatch_cmd+0x330/0x950 [ 3813.863329] scsi_request_fn+0xd8e/0x1710 [ 3813.863946] __blk_run_queue+0x10b/0x230 [ 3813.864544] blk_execute_rq_nowait+0x1d8/0x400 [ 3813.865220] sg_common_write.isra.0+0xe61/0x2420 [ 3813.871637] sg_write+0x6c8/0xef0 [ 3813.878853] __vfs_write+0xe4/0x800 [ 3813.883487] vfs_write+0x17b/0x530 [ 3813.884008] ksys_write+0x103/0x270 [ 3813.886268] __x64_sys_write+0x77/0xc0 [ 3813.886841] do_syscall_64+0x106/0x360 [ 3813.887415] entry_SYSCALL_64_after_hwframe+0x44/0xa9 This issue can be reproduced with the following syzkaller log: r0 = openat(0xffffffffffffff9c, &(0x7f0000000040)='./file0\x00', 0x26e1, 0x0) r1 = syz_open_procfs(0xffffffffffffffff, &(0x7f0000000000)='fd/3\x00') open_by_handle_at(r1, &(0x7f00000003c0)=ANY=[@ANYRESHEX], 0x602000) r2 = syz_open_dev$sg(&(0x7f0000000000), 0x0, 0x40782) write$binfmt_aout(r2, &(0x7f0000000340)=ANY=[@ANYBLOB="00000000deff000000000000000000000000000000000000000000000000000047f007af9e107a41ec395f1bded7be24277a1501ff6196a83366f4e6362bc0ff2b247f68a972989b094b2da4fb3607fcf611a22dd04310d28c75039d"], 0x126) In resp_readcap16() we get "int alloc_len" value -1104926854, and then pass the huge arr_len to fill_from_dev_buffer(), but arr is only 32 bytes. This leads to OOB in sg_copy_buffer(). To solve this issue, define alloc_len as u32.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
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resp_readcap16存在越界读取漏洞。
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-2021-47191
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|---|
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Other References for CVE-2021-47191 (3)
Same Patch Batch · Linux · 2024-04-10 · 39 CVEs total
| CVE-2021-47215 | 9.8 CRITICAL | net/mlx5e: kTLS, Fix crash in RX resync flow |
| CVE-2021-47203 | 8.8 HIGH | scsi: lpfc: Fix list_add() corruption in lpfc_drain_txq() |
| CVE-2021-47183 | 8.8 HIGH | scsi: lpfc: Fix link down processing to address NULL pointer dereference |
| CVE-2021-47184 | 8.8 HIGH | i40e: Fix NULL ptr dereference on VSI filter sync |
| CVE-2021-47188 | 7.8 HIGH | scsi: ufs: core: Improve SCSI abort handling |
| CVE-2021-47197 | 7.8 HIGH | net/mlx5e: nullify cq->dbg pointer in mlx5_debug_cq_remove() |
| CVE-2021-47196 | 7.8 HIGH | RDMA/core: Set send and receive CQ before forwarding to the driver |
| CVE-2021-47209 | 7.8 HIGH | sched/fair: Prevent dead task groups from regaining cfs_rq's |
| CVE-2021-47194 | 7.8 HIGH | cfg80211: call cfg80211_stop_ap when switch from P2P_GO type |
| CVE-2024-26815 | 7.8 HIGH | net/sched: taprio: proper TCA_TAPRIO_TC_ENTRY_INDEX check |
| CVE-2021-47200 | 7.8 HIGH | drm/prime: Fix use after free in mmap with drm_gem_ttm_mmap |
| CVE-2021-47189 | 7.8 HIGH | btrfs: fix memory ordering between normal and ordered work functions |
| CVE-2021-47201 | 7.8 HIGH | iavf: free q_vectors before queues in iavf_disable_vf |
| CVE-2021-47219 | 7.1 HIGH | scsi: scsi_debug: Fix out-of-bound read in resp_report_tgtpgs() |
| CVE-2021-47205 | clk: sunxi-ng: Unregister clocks/resets when unbinding | |
| CVE-2021-47207 | ALSA: gus: fix null pointer dereference on pointer block | |
| CVE-2021-47206 | usb: host: ohci-tmio: check return value after calling platform_get_resource() | |
| CVE-2021-47199 | net/mlx5e: CT, Fix multiple allocations and memleak of mod acts | |
| CVE-2021-47210 | usb: typec: tipd: Remove WARN_ON in tps6598x_block_read | |
| CVE-2021-47211 | ALSA: usb-audio: fix null pointer dereference on pointer cs_desc |
Showing top 20 of 39 CVEs. View all on vendor page → →
IV. Related Vulnerabilities
Same product: Linux
- CVE-2026-68450
btrfs: free mapping node on duplicate reloc root insert - CVE-2026-68449
ata: sata_dwc_460ex: fix infinite loop in NCQ tag completion - CVE-2026-68448
ovl: check access to copy_file_range source with src mounter - CVE-2026-68447
drm/amdkfd: clamp v9 CRIU control stack checkpoint copy to B - CVE-2026-68446
drm/vmwgfx: Validate vmw_surface_metadata::array_size
Same vendor: Linux
- CVE-2026-68450
btrfs: free mapping node on duplicate reloc root insert - CVE-2026-68449
ata: sata_dwc_460ex: fix infinite loop in NCQ tag completion - CVE-2026-68448
ovl: check access to copy_file_range source with src mounter - CVE-2026-68447
drm/amdkfd: clamp v9 CRIU control stack checkpoint copy to B - CVE-2026-68446
drm/vmwgfx: Validate vmw_surface_metadata::array_size
V. Comments for CVE-2021-47191
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