CVE-2021-47540— Linux kernel 安全漏洞
一分钟漏洞结论
影响对象
Linux Linux
利用判断
尚无明确在野利用证据，仍需结合暴露面评估
建议动作
优先检查厂商安全公告和参考链接中的修复版本；无法立即升级时，限制受影响服务暴露并加强监测。
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，该漏洞源于存在空指针取消引用。
可能的 ATT&CK 技术 1 AI
T1499.001 · OS Exhaustion Flood影响版本矩阵 8
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | e57b7901469fc0b021930b83a8094baaf3d81b09< 932b338f4e5c4cb0c2ed640da3bced1e63620198 |
affected |
e57b7901469fc0b021930b83a8094baaf3d81b09< 14b03b8cebdf18ff13c39d58501b625411314de2 |
affected | ||
e57b7901469fc0b021930b83a8094baaf3d81b09< 6e53d6d26920d5221d3f4d4f5ffdd629ea69aa5c |
affected | ||
5.8 |
affected | ||
< 5.8 |
unaffected | ||
5.10.84≤ 5.10.* |
unaffected | ||
5.15.7≤ 5.15.* |
unaffected | ||
5.16≤ * |
unaffected |
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一、 漏洞 CVE-2021-47540 基础信息
漏洞信息
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Vulnerability Title
mt76: mt7915: fix NULL pointer dereference in mt7915_get_phy_mode
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
mt76: mt7915: fix NULL pointer dereference in mt7915_get_phy_mode
Fix the following NULL pointer dereference in mt7915_get_phy_mode
routine adding an ibss interface to the mt7915 driver.
[ 101.137097] wlan0: Trigger new scan to find an IBSS to join
[ 102.827039] wlan0: Creating new IBSS network, BSSID 26:a4:50:1a:6e:69
[ 103.064756] Unable to handle kernel NULL pointer dereference at virtual address 0000000000000000
[ 103.073670] Mem abort info:
[ 103.076520] ESR = 0x96000005
[ 103.079614] EC = 0x25: DABT (current EL), IL = 32 bits
[ 103.084934] SET = 0, FnV = 0
[ 103.088042] EA = 0, S1PTW = 0
[ 103.091215] Data abort info:
[ 103.094104] ISV = 0, ISS = 0x00000005
[ 103.098041] CM = 0, WnR = 0
[ 103.101044] user pgtable: 4k pages, 39-bit VAs, pgdp=00000000460b1000
[ 103.107565] [0000000000000000] pgd=0000000000000000, p4d=0000000000000000, pud=0000000000000000
[ 103.116590] Internal error: Oops: 96000005 [#1] SMP
[ 103.189066] CPU: 1 PID: 333 Comm: kworker/u4:3 Not tainted 5.10.75 #0
[ 103.195498] Hardware name: MediaTek MT7622 RFB1 board (DT)
[ 103.201124] Workqueue: phy0 ieee80211_iface_work [mac80211]
[ 103.206695] pstate: 20000005 (nzCv daif -PAN -UAO -TCO BTYPE=--)
[ 103.212705] pc : mt7915_get_phy_mode+0x68/0x120 [mt7915e]
[ 103.218103] lr : mt7915_mcu_add_bss_info+0x11c/0x760 [mt7915e]
[ 103.223927] sp : ffffffc011cdb9e0
[ 103.227235] x29: ffffffc011cdb9e0 x28: ffffff8006563098
[ 103.232545] x27: ffffff8005f4da22 x26: ffffff800685ac40
[ 103.237855] x25: 0000000000000001 x24: 000000000000011f
[ 103.243165] x23: ffffff8005f4e260 x22: ffffff8006567918
[ 103.248475] x21: ffffff8005f4df80 x20: ffffff800685ac58
[ 103.253785] x19: ffffff8006744400 x18: 0000000000000000
[ 103.259094] x17: 0000000000000000 x16: 0000000000000001
[ 103.264403] x15: 000899c3a2d9d2e4 x14: 000899bdc3c3a1c8
[ 103.269713] x13: 0000000000000000 x12: 0000000000000000
[ 103.275024] x11: ffffffc010e30c20 x10: 0000000000000000
[ 103.280333] x9 : 0000000000000050 x8 : ffffff8006567d88
[ 103.285642] x7 : ffffff8006563b5c x6 : ffffff8006563b44
[ 103.290952] x5 : 0000000000000002 x4 : 0000000000000001
[ 103.296262] x3 : 0000000000000001 x2 : 0000000000000001
[ 103.301572] x1 : 0000000000000000 x0 : 0000000000000011
[ 103.306882] Call trace:
[ 103.309328] mt7915_get_phy_mode+0x68/0x120 [mt7915e]
[ 103.314378] mt7915_bss_info_changed+0x198/0x200 [mt7915e]
[ 103.319941] ieee80211_bss_info_change_notify+0x128/0x290 [mac80211]
[ 103.326360] __ieee80211_sta_join_ibss+0x308/0x6c4 [mac80211]
[ 103.332171] ieee80211_sta_create_ibss+0x8c/0x10c [mac80211]
[ 103.337895] ieee80211_ibss_work+0x3dc/0x614 [mac80211]
[ 103.343185] ieee80211_iface_work+0x388/0x3f0 [mac80211]
[ 103.348495] process_one_work+0x288/0x690
[ 103.352499] worker_thread+0x70/0x464
[ 103.356157] kthread+0x144/0x150
[ 103.359380] ret_from_fork+0x10/0x18
[ 103.362952] Code: 394008c3 52800220 394000e4 7100007f (39400023)
来源: CVE Program / CVE List V5
CVSS Information
N/A
来源: CVE Program / CVE List V5
Vulnerability Type
N/A
来源: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
来源: 中国国家信息安全漏洞库 CNNVD
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，该漏洞源于存在空指针取消引用。
来源: 中国国家信息安全漏洞库 CNNVD
CVSS Information
N/A
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Type
N/A
来源: 中国国家信息安全漏洞库 CNNVD
受影响产品
二、漏洞 CVE-2021-47540 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
AI 生成 POC
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CVE-2021-47540 其他参考 (3)
同批安全公告 · Linux · 2024-05-24 · 共 72 条
| CVE-2021-47544 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2021-47506 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2021-47536 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2021-47520 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2023-52880 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2021-47505 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2021-47512 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2021-47502 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2021-47517 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2021-47533 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2021-47500 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2021-47541 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2021-47552 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2021-47551 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2021-47555 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2021-47561 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2021-47535 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2021-47559 | 7.5 HIGH | Linux kernel 安全漏洞 |
| CVE-2021-47515 | 7.5 HIGH | Linux kernel 安全漏洞 |
| CVE-2021-47554 | Linux kernel 安全漏洞 |
显示前 20 条，共 72 条。 查看全部 → →
IV. Related Vulnerabilities
V. Comments for CVE-2021-47540
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