CVE-2024-50121

一、漏洞信息
 漏洞编号：[CVE-2024-50121](https://nvd.nist.gov/vuln/detail/CVE-2024-50121)
 漏洞归属组件：[kernel](https://gitee.com/src-openeuler/kernel)
 漏洞归属的版本：4.19.140,4.19.194,4.19.90,5.10.0,6.1.0,6.1.14,6.1.19,6.1.5,6.1.6,6.1.8,6.4.0,6.6.0
 CVSS V3.0分值：
  BaseScore：7.8 High
  Vector：CVSS：3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
 漏洞简述：
  In the Linux kernel, the following vulnerability has been resolved:nfsd: cancel nfsd_shrinker_work using sync mode in nfs4_state_shutdown_netIn the normal case, when we excute `echo 0 > /proc/fs/nfsd/threads`, thefunction `nfs4_state_destroy_net` in `nfs4_state_shutdown_net` willrelease all resources related to the hashed `nfs4_client`. If the`nfsd_client_shrinker` is running concurrently, the `expire_client`function will first unhash this client and then destroy it. This canlead to the following warning. Additionally, numerous use-after-freeerrors may occur as well.nfsd_client_shrinker         echo 0 > /proc/fs/nfsd/threadsexpire_client                nfsd_shutdown_net  unhash_client                ...                               nfs4_state_shutdown_net                                 /* won t wait shrinker exit */  /*                             cancel_work(&nn->nfsd_shrinker_work)   * nfsd_file for this          /* won t destroy unhashed client1 */   * client1 still alive         nfs4_state_destroy_net   */                               nfsd_file_cache_shutdown                                 /* trigger warning */                                 kmem_cache_destroy(nfsd_file_slab)                                 kmem_cache_destroy(nfsd_file_mark_slab)  /* release nfsd_file and mark */  __destroy_client====================================================================BUG nfsd_file (Not tainted): Objects remaining in nfsd_file on__kmem_cache_shutdown()--------------------------------------------------------------------CPU: 4 UID: 0 PID: 764 Comm: sh Not tainted 6.12.0-rc3+ #1 dump_stack_lvl+0x53/0x70 slab_err+0xb0/0xf0 __kmem_cache_shutdown+0x15c/0x310 kmem_cache_destroy+0x66/0x160 nfsd_file_cache_shutdown+0xac/0x210 [nfsd] nfsd_destroy_serv+0x251/0x2a0 [nfsd] nfsd_svc+0x125/0x1e0 [nfsd] write_threads+0x16a/0x2a0 [nfsd] nfsctl_transaction_write+0x74/0xa0 [nfsd] vfs_write+0x1a5/0x6d0 ksys_write+0xc1/0x160 do_syscall_64+0x5f/0x170 entry_SYSCALL_64_after_hwframe+0x76/0x7e====================================================================BUG nfsd_file_mark (Tainted: G    B   W         ): Objects remainingnfsd_file_mark on __kmem_cache_shutdown()-------------------------------------------------------------------- dump_stack_lvl+0x53/0x70 slab_err+0xb0/0xf0 __kmem_cache_shutdown+0x15c/0x310 kmem_cache_destroy+0x66/0x160 nfsd_file_cache_shutdown+0xc8/0x210 [nfsd] nfsd_destroy_serv+0x251/0x2a0 [nfsd] nfsd_svc+0x125/0x1e0 [nfsd] write_threads+0x16a/0x2a0 [nfsd] nfsctl_transaction_write+0x74/0xa0 [nfsd] vfs_write+0x1a5/0x6d0 ksys_write+0xc1/0x160 do_syscall_64+0x5f/0x170 entry_SYSCALL_64_after_hwframe+0x76/0x7eTo resolve this issue, cancel `nfsd_shrinker_work` using synchronousmode in nfs4_state_shutdown_net.
 漏洞公开时间：2024-11-06 02:15:15
 漏洞创建时间：2024-11-07 15:09:59
 漏洞详情参考链接：
  https://nvd.nist.gov/vuln/detail/CVE-2024-50121
<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/add1df5eba163a3a6ece11cb85890e2e410baaea |  |
| 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | https://git.kernel.org/stable/c/d5ff2fb2e7167e9483846e34148e60c0c016a1f6 |  |
| 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | https://git.kernel.org/stable/c/f965dc0f099a54fca100acf6909abe52d0c85328 |  |
| suse_bugzilla | http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2024-50121 | https://bugzilla.suse.com/show_bug.cgi?id=1232925 |
| suse_bugzilla | https://www.cve.org/CVERecord?id=CVE-2024-50121 | https://bugzilla.suse.com/show_bug.cgi?id=1232925 |
| suse_bugzilla | https://git.kernel.org/stable/c/add1df5eba163a3a6ece11cb85890e2e410baaea | https://bugzilla.suse.com/show_bug.cgi?id=1232925 |
| suse_bugzilla | https://git.kernel.org/stable/c/d5ff2fb2e7167e9483846e34148e60c0c016a1f6 | https://bugzilla.suse.com/show_bug.cgi?id=1232925 |
| suse_bugzilla | https://git.kernel.org/stable/c/f965dc0f099a54fca100acf6909abe52d0c85328 | https://bugzilla.suse.com/show_bug.cgi?id=1232925 |
| suse_bugzilla | https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2024/CVE-2024-50121.mbox | https://bugzilla.suse.com/show_bug.cgi?id=1232925 |
| suse_bugzilla | https://bugzilla.redhat.com/show_bug.cgi?id=2323905 | https://bugzilla.suse.com/show_bug.cgi?id=1232925 |
| redhat_bugzilla | https://lore.kernel.org/linux-cve-announce/2024110556-CVE-2024-50121-2a0a@gregkh/T | https://bugzilla.redhat.com/show_bug.cgi?id=2323905 |
| debian |  | https://security-tracker.debian.org/tracker/CVE-2024-50121 |
| mageia |  | http://advisories.mageia.org/MGASA-2024-0368.html |

</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:
  其它
 漏洞补丁信息：
  <details>
<summary>详情(点击展开)</summary>

| 影响的包 | 修复版本 | 修复补丁 | 问题引入补丁 | 来源  |
| ------- | -------- | ------- | -------- | --------- |
|  |  | https://git.kernel.org/stable/c/add1df5eba163a3a6ece11cb85890e2e410baaea |  | nvd |
|  |  | https://git.kernel.org/stable/c/d5ff2fb2e7167e9483846e34148e60c0c016a1f6 |  | nvd |
|  |  | https://git.kernel.org/stable/c/f965dc0f099a54fca100acf6909abe52d0c85328 |  | nvd |

</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:nfsd: cancel nfsd_shrinker_work using sync mode in nfs4_state_shutdown_netIn the normal case, when we excute `echo 0 > /proc/fs/nfsd/threads`, thefunction `nfs4_state_destroy_net` in `nfs4_state_shutdown_net` willrelease all resources related to the hashed `nfs4_client`. If the`nfsd_client_shrinker` is running concurrently, the `expire_client`function will first unhash this client and then destroy it. This canlead to the following warning. Additionally, numerous use-after-freeerrors may occur as well.nfsd_client_shrinker         echo 0 > /proc/fs/nfsd/threadsexpire_client                nfsd_shutdown_net  unhash_client                ...                               nfs4_state_shutdown_net                                 /* won t wait shrinker exit */  /*                             cancel_work(&nn->nfsd_shrinker_work)   * nfsd_file for this          /* won t destroy unhashed client1 */   * client1 still alive         nfs4_state_destroy_net   */                               nfsd_file_cache_shutdown                                 /* trigger warning */                                 kmem_cache_destroy(nfsd_file_slab)                                 kmem_cache_destroy(nfsd_file_mark_slab)  /* release nfsd_file and mark */  __destroy_client====================================================================BUG nfsd_file (Not tainted): Objects remaining in nfsd_file on__kmem_cache_shutdown()--------------------------------------------------------------------CPU: 4 UID: 0 PID: 764 Comm: sh Not tainted 6.12.0-rc3+ #1 dump_stack_lvl+0x53/0x70 slab_err+0xb0/0xf0 __kmem_cache_shutdown+0x15c/0x310 kmem_cache_destroy+0x66/0x160 nfsd_file_cache_shutdown+0xac/0x210 [nfsd] nfsd_destroy_serv+0x251/0x2a0 [nfsd] nfsd_svc+0x125/0x1e0 [nfsd] write_threads+0x16a/0x2a0 [nfsd] nfsctl_transaction_write+0x74/0xa0 [nfsd] vfs_write+0x1a5/0x6d0 ksys_write+0xc1/0x160 do_syscall_64+0x5f/0x170 entry_SYSCALL_64_after_hwframe+0x76/0x7e====================================================================BUG nfsd_file_mark (Tainted: G    B   W         ): Objects remainingnfsd_file_mark on __kmem_cache_shutdown()-------------------------------------------------------------------- dump_stack_lvl+0x53/0x70 slab_err+0xb0/0xf0 __kmem_cache_shutdown+0x15c/0x310 kmem_cache_destroy+0x66/0x160 nfsd_file_cache_shutdown+0xc8/0x210 [nfsd] nfsd_destroy_serv+0x251/0x2a0 [nfsd] nfsd_svc+0x125/0x1e0 [nfsd] write_threads+0x16a/0x2a0 [nfsd] nfsctl_transaction_write+0x74/0xa0 [nfsd] vfs_write+0x1a5/0x6d0 ksys_write+0xc1/0x160 do_syscall_64+0x5f/0x170 entry_SYSCALL_64_after_hwframe+0x76/0x7eTo resolve this issue, cancel `nfsd_shrinker_work` using synchronousmode in nfs4_state_shutdown_net.
 openEuler评分：
  7.8
 Vector：CVSS：3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
 受影响版本排查(受影响/不受影响)：
  1.openEuler-24.03-LTS(6.6.0):受影响
2.openEuler-20.03-LTS-SP4(4.19.90):不受影响
3.openEuler-22.03-LTS-SP3(5.10.0):不受影响
4.openEuler-22.03-LTS-SP4(5.10.0):不受影响
5.master:不受影响
6.openEuler-24.03-LTS-Next(6.6.0):不受影响
7.openEuler-24.03-LTS-SP1(6.6.0):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(5.10.0):否
3.openEuler-22.03-LTS-SP3(5.10.0):否
4.master:否
5.openEuler-24.03-LTS(6.6.0):否
6.openEuler-24.03-LTS-Next(6.6.0):否
7.openEuler-22.03-LTS-SP4(5.10.0):否
8.openEuler-24.03-LTS-SP1(6.6.0):否

原因说明：
  1.openEuler-24.03-LTS(6.6.0):正常修复
2.master:不受影响-漏洞代码不能被攻击者触发
3.openEuler-24.03-LTS-Next(6.6.0):不受影响-漏洞代码不能被攻击者触发
4.openEuler-20.03-LTS-SP4(4.19.90):不受影响-漏洞代码不存在
5.openEuler-22.03-LTS-SP3(5.10.0):不受影响-漏洞代码不存在
6.openEuler-22.03-LTS-SP4(5.10.0):不受影响-漏洞代码不存在
7.openEuler-24.03-LTS-SP1(6.6.0):不受影响-漏洞代码不存在

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