CVE-2024-56700

一、漏洞信息
 漏洞编号：[CVE-2024-56700](https://nvd.nist.gov/vuln/detail/CVE-2024-56700)
 漏洞归属组件：[kernel](https://gitee.com/src-openeuler/kernel)
 漏洞归属的版本：4.19.140,4.19.194,4.19.90,5.10.0,6.1.19,6.4.0,6.6.0
 CVSS V3.0分值：
  BaseScore：0.0 None
  Vector：CVSS：3.0/
 漏洞简述：
  In the Linux kernel, the following vulnerability has been resolved:media: wl128x: Fix atomicity violation in fmc_send_cmd()Atomicity violation occurs when the fmc_send_cmd() function is executedsimultaneously with the modification of the fmdev->resp_skb value.Consider a scenario where, after passing the validity check within thefunction, a non-null fmdev->resp_skb variable is assigned a null value.This results in an invalid fmdev->resp_skb variable passing the validitycheck. As seen in the later part of the function, skb = fmdev->resp_skb;when the invalid fmdev->resp_skb passes the check, a null pointerdereference error may occur at line 478, evt_hdr = (void *)skb->data;To address this issue, it is recommended to include the validity check offmdev->resp_skb within the locked section of the function. Thismodification ensures that the value of fmdev->resp_skb does not changeduring the validation process, thereby maintaining its validity.This possible bug is found by an experimental static analysis tooldeveloped by our team. This tool analyzes the locking APIsto extract function pairs that can be concurrently executed, and thenanalyzes the instructions in the paired functions to identify possibleconcurrency bugs including data races and atomicity violations.
 漏洞公开时间：2024-12-28 18:15:17
 漏洞创建时间：2024-12-28 18:31:08
 漏洞详情参考链接：
  https://nvd.nist.gov/vuln/detail/CVE-2024-56700
<details>
<summary>更多参考(点击展开)</summary>

| 参考来源 | 参考链接 | 来源链接 |
| ------- | -------- | -------- |
| 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | https://git.kernel.org/stable/c/2e63c908de357048180516b84740ed62dac0b269 |  |
| 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | https://git.kernel.org/stable/c/372dc9509122e5d45d4c12978e31c3c7d00aaca4 |  |
| 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | https://git.kernel.org/stable/c/378ce4e08ca2b1ac7bbf1d57b68643ca4226c5f8 |  |
| 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | https://git.kernel.org/stable/c/3c818ad07e964bca3d27adac1e1f50e1e3c9180e |  |
| 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | https://git.kernel.org/stable/c/80a3b2ee01eecf22dfa06968b3cde92c691dea10 |  |
| 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | https://git.kernel.org/stable/c/ca59f9956d4519ab18ab2270be47c6b8c6ced091 |  |
| 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | https://git.kernel.org/stable/c/d16109c9fdc1b8cea4fe63b42e06e926c3f68990 |  |
| 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | https://git.kernel.org/stable/c/d7408a052aa1b4f6fb6f1c7a8877b84017a07ac9 |  |
| 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | https://git.kernel.org/stable/c/ed228b74d8a500380150965d5becabf9a1e33141 |  |
| redhat_bugzilla | https://lore.kernel.org/linux-cve-announce/2024122836-CVE-2024-56700-d3d1@gregkh/T | https://bugzilla.redhat.com/show_bug.cgi?id=2334664 |
| debian |  | https://security-tracker.debian.org/tracker/CVE-2024-56700 |

</details>

漏洞分析指导链接：
  https://gitee.com/openeuler/cve-manager/blob/master/cve-vulner-manager/doc/md/manual.md
 漏洞数据来源:
  openBrain开源漏洞感知系统
 漏洞补丁信息：
  <details>
<summary>详情(点击展开)</summary>

无
</details>

二、漏洞分析结构反馈
 影响性分析说明：
  In the Linux kernel, the following vulnerability has been resolved:media: wl128x: Fix atomicity violation in fmc_send_cmd()Atomicity violation occurs when the fmc_send_cmd() function is executedsimultaneously with the modification of the fmdev-&gt;resp_skb value.Consider a scenario where, after passing the validity check within thefunction, a non-null fmdev-&gt;resp_skb variable is assigned a null value.This results in an invalid fmdev-&gt;resp_skb variable passing the validitycheck. As seen in the later part of the function, skb = fmdev-&gt;resp_skb;when the invalid fmdev-&gt;resp_skb passes the check, a null pointerdereference error may occur at line 478, evt_hdr = (void *)skb-&gt;data;To address this issue, it is recommended to include the validity check offmdev-&gt;resp_skb within the locked section of the function. Thismodification ensures that the value of fmdev-&gt;resp_skb does not changeduring the validation process, thereby maintaining its validity.This possible bug is found by an experimental static analysis tooldeveloped by our team. This tool analyzes the locking APIsto extract function pairs that can be concurrently executed, and thenanalyzes the instructions in the paired functions to identify possibleconcurrency bugs including data races and atomicity violations.The Linux kernel CVE team has assigned CVE-2024-56700 to this issue.
 openEuler评分：
  5.5
 Vector：CVSS：3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
 受影响版本排查(受影响/不受影响)：
  1.openEuler-20.03-LTS-SP4(4.19.90):受影响
2.openEuler-22.03-LTS-SP1:受影响
3.openEuler-22.03-LTS-SP3:受影响
4.openEuler-22.03-LTS-SP4:受影响
5.openEuler-24.03-LTS:受影响
6.openEuler-24.03-LTS-SP1:受影响
7.master:不受影响
8.openEuler-24.03-LTS-Next:不受影响

修复是否涉及abi变化(是/否)：
  1.openEuler-20.03-LTS-SP4(4.19.90):否
2.openEuler-22.03-LTS-SP1:否
3.openEuler-22.03-LTS-SP3:否
4.master:否
5.openEuler-24.03-LTS:否
6.openEuler-24.03-LTS-Next:否
7.openEuler-22.03-LTS-SP4:否
8.openEuler-24.03-LTS-SP1:否

原因说明：
  1.openEuler-20.03-LTS-SP4(4.19.90):正常修复
2.openEuler-22.03-LTS-SP1:正常修复
3.openEuler-22.03-LTS-SP3:正常修复
4.openEuler-22.03-LTS-SP4:正常修复
5.openEuler-24.03-LTS:正常修复
6.openEuler-24.03-LTS-SP1:正常修复
7.master:不受影响-漏洞代码不能被攻击者触发
8.openEuler-24.03-LTS-Next:不受影响-漏洞代码不能被攻击者触发

三、漏洞修复
安全公告链接：https://www.openeuler.org/zh/security/safety-bulletin/detail/?id=openEuler-SA-2025-1037

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