CVE-2026-72121— 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基金会开源的一个操作系统内核。 Linux kernel 6.15版本存在安全漏洞，该漏洞源于can bcm模块在更新过滤器和定时器值时缺少锁定，导致并发访问时存在竞争条件，可能导致数据被覆盖或状态不一致。
可能的 ATT&CK 技术 1 AI
T1190 · Exploit Public-Facing Application影响版本矩阵 27
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | 7595de7bc56e0e52b74e56c90f7e247bf626d628< 96994180bd7b248b0cc698afe926e23fc1bda59b |
affected |
fbd8fdc2b218e979cfe422b139b8f74c12419d1f< caa8704a7f3cb7806331596195385437126ecb3a |
affected | ||
2a437b86ac5a9893c902f30ef66815bf13587bf6< a7c369e7da8203e2b5be12bbcac7b9ab2ed5b658 |
affected | ||
76c84c3728178b2d38d5604e399dfe8b0752645e< a7eb6db1cd3f7b556a301dc1265945ad112089f7 |
affected | ||
cc55dd28c20a6611e30596019b3b2f636819a4c0< 834cbca3b12e46887f7a9b35f1981a888360ea4c |
affected | ||
c2aba69d0c36a496ab4f2e81e9c2b271f2693fd7< 19b1994069dd29478ba767de1f98f14a088198dc |
affected | ||
c2aba69d0c36a496ab4f2e81e9c2b271f2693fd7< fc9f5ee1b073bd233d9c604e338af4ebb42cbc33 |
affected | ||
c2aba69d0c36a496ab4f2e81e9c2b271f2693fd7< 749179c2e25b95d22499ed29096b3e02d6dfd2b4 |
affected | ||
| … +19 条更多 | |||
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一、 漏洞 CVE-2026-72121 基础信息
漏洞信息
对漏洞内容有疑问？看看神龙的深度分析是否有帮助！
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Vulnerability Title
can: bcm: add locking when updating filter and timer values
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
can: bcm: add locking when updating filter and timer values
KCSAN detected a simultaneous access to timer values that can be
overwritten in bcm_rx_setup() when updating timer and filter content
while bcm_rx_handler(), bcm_rx_timeout_handler() or bcm_rx_thr_handler()
run concurrently on incoming CAN traffic.
Protect the timer (ival1/ival2/kt_ival1/kt_ival2/kt_lastmsg) and filter
(nframes/flags/frames/last_frames) updates in bcm_rx_setup() with a new
per-op bcm_rx_update_lock, taken with the matching scope in the RX
handlers. memcpy_from_msg() is staged into a temporary buffer before the
lock is taken, since it can sleep and must not run under a spinlock.
hrtimer_cancel() is always called without bcm_rx_update_lock held, since
bcm_rx_timeout_handler()/bcm_rx_thr_handler() take the same lock and a
running callback would otherwise deadlock against the canceller.
Also close a related race: bcm_rx_setup() cleared the RTR flag in the
stored reply frame's can_id as a separate, unprotected step after the
frame content was already installed, so a concurrent bcm_rx_handler()
could transmit a stale reply with CAN_RTR_FLAG still set. Fold that
normalization into the initial frame preparation instead (on the staged
buffer for updates, directly on op->frames pre-registration for new
ops), so the installed frame is always atomically self-consistent.
bcm_rx_handler()'s RX_RTR_FRAME check now takes a lock-protected
snapshot of op->flags before deciding whether to call bcm_can_tx(),
but does not hold the lock across that call.
Also take a lock-protected snapshot of the currframe in bcm_can_tx()
to avoid partly overwrites by content updates in bcm_tx_setup().
Finally check if a TX_RESET_MULTI_IDX/SETTIMER might have reset
op->currframe between the two locked sections in bcm_can_tx().
Omit calling hrtimer_forward() with zero interval in bcm_rx_thr_handler().
kt_ival2 may have been concurrently cleared by bcm_rx_setup() before it
cancels this timer, so check kt_ival2 inside the bcm_rx_update_lock.
来源: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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基金会开源的一个操作系统内核。 Linux kernel 6.15版本存在安全漏洞，该漏洞源于can bcm模块在更新过滤器和定时器值时缺少锁定，导致并发访问时存在竞争条件，可能导致数据被覆盖或状态不一致。
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-2026-72121 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2026-72121 补丁与修复 (6)
同批安全公告 · Linux · 2026-08-15 · 共 845 条
| CVE-2026-72407 | 10.0 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-72408 | 10.0 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-74475 | 10.0 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-74279 | 10.0 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-74280 | 10.0 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-72421 | 10.0 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-74309 | 10.0 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-72493 | 9.9 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-74376 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-74433 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-74434 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-72191 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-72299 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-72398 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-74384 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-72442 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-74436 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-74545 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-72046 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-72473 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
显示前 20 条，共 845 条。 查看全部 → →
IV. Related Vulnerabilities
V. Comments for CVE-2026-72121
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