CVE-2024-49863

一、漏洞信息
 漏洞编号：[CVE-2024-49863](https://nvd.nist.gov/vuln/detail/CVE-2024-49863)
 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.x分值：
  BaseScore：5.5 Medium
  Vector：CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
 漏洞简述：
  In the Linux kernel, the following vulnerability has been resolved:vhost/scsi: null-ptr-dereference in vhost_scsi_get_req()Since commit 3f8ca2e115e5 ( vhost/scsi: Extract common handling codefrom control queue handler ) a null pointer dereference bug can betriggered when guest sends an SCSI AN request.In vhost_scsi_ctl_handle_vq(), `vc.target` is assigned with`&v_req.tmf.lun[1]` within a switch-case block and is then passed tovhost_scsi_get_req() which extracts `vc->req` and `tpg`. However, fora `VIRTIO_SCSI_T_AN_*` request, tpg is not required, so `vc.target` isset to NULL in this branch. Later, in vhost_scsi_get_req(),`vc->target` is dereferenced without being checked, leading to a nullpointer dereference bug. This bug can be triggered from guest.When this bug occurs, the vhost_worker process is killed while holding`vq->mutex` and the corresponding tpg will remain occupiedindefinitely.Below is the KASAN report:Oops: general protection fault, probably for non-canonical address0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN NOPTIKASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]CPU: 1 PID: 840 Comm: poc Not tainted 6.10.0+ #1Hardware name: QEMU Ubuntu 24.04 PC (i440FX + PIIX, 1996), BIOS1.16.3-debian-1.16.3-2 04/01/2014RIP: 0010:vhost_scsi_get_req+0x165/0x3a0Code: 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 2b 02 00 0048 b8 00 00 00 00 00 fc ff df 4d 8b 65 30 4c 89 e2 48 c1 ea 03 <0f> b604 02 4c 89 e2 83 e2 07 38 d0 7f 08 84 c0 0f 85 be 01 00 00RSP: 0018:ffff888017affb50 EFLAGS: 00010246RAX: dffffc0000000000 RBX: ffff88801b000000 RCX: 0000000000000000RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff888017affcb8RBP: ffff888017affb80 R08: 0000000000000000 R09: 0000000000000000R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000R13: ffff888017affc88 R14: ffff888017affd1c R15: ffff888017993000FS:  000055556e076500(0000) GS:ffff88806b100000(0000) knlGS:0000000000000000CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033CR2: 00000000200027c0 CR3: 0000000010ed0004 CR4: 0000000000370ef0Call Trace: <TASK> ? show_regs+0x86/0xa0 ? die_addr+0x4b/0xd0 ? exc_general_protection+0x163/0x260 ? asm_exc_general_protection+0x27/0x30 ? vhost_scsi_get_req+0x165/0x3a0 vhost_scsi_ctl_handle_vq+0x2a4/0xca0 ? __pfx_vhost_scsi_ctl_handle_vq+0x10/0x10 ? __switch_to+0x721/0xeb0 ? __schedule+0xda5/0x5710 ? __kasan_check_write+0x14/0x30 ? _raw_spin_lock+0x82/0xf0 vhost_scsi_ctl_handle_kick+0x52/0x90 vhost_run_work_list+0x134/0x1b0 vhost_task_fn+0x121/0x350... </TASK>---[ end trace 0000000000000000 ]---Let s add a check in vhost_scsi_get_req.[whitespace fixes]
 漏洞公开时间：2024-10-22 02:15:06
 漏洞创建时间：2024-10-22 02:59:27
 漏洞详情参考链接：
  https://nvd.nist.gov/vuln/detail/CVE-2024-49863
<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/00fb5b23e1c9cdbe496f5cd6b40367cb895f6c93 |  |
| 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | https://git.kernel.org/stable/c/221af82f606d928ccef19a16d35633c63026f1be |  |
| 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | https://git.kernel.org/stable/c/25613e6d9841a1f9fb985be90df921fa99f800de |  |
| 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | https://git.kernel.org/stable/c/46128370a72c431df733af5ebb065c4d48c9ad39 |  |
| 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | https://git.kernel.org/stable/c/61517f33e76d2c5247c1e61e668693afe5b67e6f |  |
| 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | https://git.kernel.org/stable/c/6592347f06e2b19a624270a85ad4b3ae48c3b241 |  |
| 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | https://git.kernel.org/stable/c/ace9c778a214da9c98d7b69d904d1b0816f4f681 |  |
| suse_bugzilla | http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2024-49863 | https://bugzilla.suse.com/show_bug.cgi?id=1232255 |
| suse_bugzilla | https://www.cve.org/CVERecord?id=CVE-2024-49863 | https://bugzilla.suse.com/show_bug.cgi?id=1232255 |
| suse_bugzilla | https://git.kernel.org/stable/c/00fb5b23e1c9cdbe496f5cd6b40367cb895f6c93 | https://bugzilla.suse.com/show_bug.cgi?id=1232255 |
| suse_bugzilla | https://git.kernel.org/stable/c/221af82f606d928ccef19a16d35633c63026f1be | https://bugzilla.suse.com/show_bug.cgi?id=1232255 |
| suse_bugzilla | https://git.kernel.org/stable/c/25613e6d9841a1f9fb985be90df921fa99f800de | https://bugzilla.suse.com/show_bug.cgi?id=1232255 |
| suse_bugzilla | https://git.kernel.org/stable/c/46128370a72c431df733af5ebb065c4d48c9ad39 | https://bugzilla.suse.com/show_bug.cgi?id=1232255 |
| suse_bugzilla | https://git.kernel.org/stable/c/61517f33e76d2c5247c1e61e668693afe5b67e6f | https://bugzilla.suse.com/show_bug.cgi?id=1232255 |
| suse_bugzilla | https://git.kernel.org/stable/c/6592347f06e2b19a624270a85ad4b3ae48c3b241 | https://bugzilla.suse.com/show_bug.cgi?id=1232255 |
| suse_bugzilla | https://git.kernel.org/stable/c/ace9c778a214da9c98d7b69d904d1b0816f4f681 | https://bugzilla.suse.com/show_bug.cgi?id=1232255 |
| suse_bugzilla | https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2024/CVE-2024-49863.mbox | https://bugzilla.suse.com/show_bug.cgi?id=1232255 |
| suse_bugzilla | https://bugzilla.redhat.com/show_bug.cgi?id=2320569 | https://bugzilla.suse.com/show_bug.cgi?id=1232255 |
| redhat_bugzilla | https://lore.kernel.org/linux-cve-announce/2024102110-CVE-2024-49863-6a74@gregkh/T | https://bugzilla.redhat.com/show_bug.cgi?id=2320569 |
| debian |  | https://security-tracker.debian.org/tracker/CVE-2024-49863 |
| anolis |  | https://anas.openanolis.cn/cves/detail/CVE-2024-49863 |
| mageia |  | http://advisories.mageia.org/MGASA-2024-0345.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:
  openBrain开源漏洞感知系统
 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/00fb5b23e1c9cdbe496f5cd6b40367cb895f6c93 |  | nvd |
|  |  | https://git.kernel.org/stable/c/221af82f606d928ccef19a16d35633c63026f1be |  | nvd |
|  |  | https://git.kernel.org/stable/c/25613e6d9841a1f9fb985be90df921fa99f800de |  | nvd |
|  |  | https://git.kernel.org/stable/c/46128370a72c431df733af5ebb065c4d48c9ad39 |  | nvd |
|  |  | https://git.kernel.org/stable/c/61517f33e76d2c5247c1e61e668693afe5b67e6f |  | nvd |
|  |  | https://git.kernel.org/stable/c/6592347f06e2b19a624270a85ad4b3ae48c3b241 |  | nvd |
|  |  | https://git.kernel.org/stable/c/ace9c778a214da9c98d7b69d904d1b0816f4f681 |  | 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:vhost/scsi: null-ptr-dereference in vhost_scsi_get_req()Since commit 3f8ca2e115e5 ( vhost/scsi: Extract common handling codefrom control queue handler ) a null pointer dereference bug can betriggered when guest sends an SCSI AN request.In vhost_scsi_ctl_handle_vq(), `vc.target` is assigned with`&v_req.tmf.lun[1]` within a switch-case block and is then passed tovhost_scsi_get_req() which extracts `vc->req` and `tpg`. However, fora `VIRTIO_SCSI_T_AN_*` request, tpg is not required, so `vc.target` isset to NULL in this branch. Later, in vhost_scsi_get_req(),`vc->target` is dereferenced without being checked, leading to a nullpointer dereference bug. This bug can be triggered from guest.When this bug occurs, the vhost_worker process is killed while holding`vq->mutex` and the corresponding tpg will remain occupiedindefinitely.Below is the KASAN report:Oops: general protection fault, probably for non-canonical address0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN NOPTIKASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]CPU: 1 PID: 840 Comm: poc Not tainted 6.10.0+ #1Hardware name: QEMU Ubuntu 24.04 PC (i440FX + PIIX, 1996), BIOS1.16.3-debian-1.16.3-2 04/01/2014RIP: 0010:vhost_scsi_get_req+0x165/0x3a0Code: 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 2b 02 00 0048 b8 00 00 00 00 00 fc ff df 4d 8b 65 30 4c 89 e2 48 c1 ea 03 <0f> b604 02 4c 89 e2 83 e2 07 38 d0 7f 08 84 c0 0f 85 be 01 00 00RSP: 0018:ffff888017affb50 EFLAGS: 00010246RAX: dffffc0000000000 RBX: ffff88801b000000 RCX: 0000000000000000RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff888017affcb8RBP: ffff888017affb80 R08: 0000000000000000 R09: 0000000000000000R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000R13: ffff888017affc88 R14: ffff888017affd1c R15: ffff888017993000FS:  000055556e076500(0000) GS:ffff88806b100000(0000) knlGS:0000000000000000CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033CR2: 00000000200027c0 CR3: 0000000010ed0004 CR4: 0000000000370ef0Call Trace: <TASK> ? show_regs+0x86/0xa0 ? die_addr+0x4b/0xd0 ? exc_general_protection+0x163/0x260 ? asm_exc_general_protection+0x27/0x30 ? vhost_scsi_get_req+0x165/0x3a0 vhost_scsi_ctl_handle_vq+0x2a4/0xca0 ? __pfx_vhost_scsi_ctl_handle_vq+0x10/0x10 ? __switch_to+0x721/0xeb0 ? __schedule+0xda5/0x5710 ? __kasan_check_write+0x14/0x30 ? _raw_spin_lock+0x82/0xf0 vhost_scsi_ctl_handle_kick+0x52/0x90 vhost_run_work_list+0x134/0x1b0 vhost_task_fn+0x121/0x350... </TASK>---[ end trace 0000000000000000 ]---Let s add a check in vhost_scsi_get_req.[whitespace fixes] 
 openEuler评分：
  5.5
 Vector：CVSS:3.1/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-22.03-LTS-SP1(5.10.0):受影响
2.openEuler-22.03-LTS-SP3(5.10.0):受影响
3.openEuler-22.03-LTS-SP4(5.10.0):受影响
4.openEuler-24.03-LTS(6.6.0):受影响
5.openEuler-20.03-LTS-SP4(4.19.90):不受影响
6.master(6.12.33):不受影响
7.openEuler-24.03-LTS-Next(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(6.12.33):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.master(6.12.33):
9.openEuler-20.03-LTS-SP4(4.19.90):
10.openEuler-22.03-LTS-SP1(5.10.0):
11.openEuler-22.03-LTS-SP3(5.10.0):
12.openEuler-22.03-LTS-SP4(5.10.0):
13.openEuler-24.03-LTS(6.6.0):
14.openEuler-24.03-LTS-Next(6.6.0):
15.openEuler-24.03-LTS-SP1(6.6.0):

原因说明：
  1.master(6.12.33):
2.openEuler-20.03-LTS-SP4(4.19.90):
3.openEuler-22.03-LTS-SP3(5.10.0):
4.openEuler-22.03-LTS-SP4(5.10.0):
5.openEuler-24.03-LTS(6.6.0):
6.openEuler-24.03-LTS-Next(6.6.0):
7.openEuler-24.03-LTS-SP1(6.6.0):
8.openEuler-24.03-LTS-SP2(6.6.0):
9.openEuler-24.03-LTS-SP3(6.6.0):

三、漏洞修复
安全公告链接：https://www.openeuler.org/zh/security/safety-bulletin/detail/?id=openEuler-SA-2025-2802

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