CVE-2022-50323

一、漏洞信息
 漏洞编号：[CVE-2022-50323](https://nvd.nist.gov/vuln/detail/CVE-2022-50323)
 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.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:net: do not sense pfmemalloc status in skb_append_pagefrags()skb_append_pagefrags() is used by af_unix and udp sendpage()implementation so far.In commit 326140063946 ( tcp: TX zerocopy should not sensepfmemalloc status ) we explained why we should not sensepfmemalloc status for pages owned by user space.We should also use skb_fill_page_desc_noacc()in skb_append_pagefrags() to avoid following KCSAN report:BUG: KCSAN: data-race in lru_add_fn / skb_append_pagefragswrite to 0xffffea00058fc1c8 of 8 bytes by task 17319 on cpu 0:__list_add include/linux/list.h:73 [inline]list_add include/linux/list.h:88 [inline]lruvec_add_folio include/linux/mm_inline.h:323 [inline]lru_add_fn+0x327/0x410 mm/swap.c:228folio_batch_move_lru+0x1e1/0x2a0 mm/swap.c:246lru_add_drain_cpu+0x73/0x250 mm/swap.c:669lru_add_drain+0x21/0x60 mm/swap.c:773free_pages_and_swap_cache+0x16/0x70 mm/swap_state.c:311tlb_batch_pages_flush mm/mmu_gather.c:59 [inline]tlb_flush_mmu_free mm/mmu_gather.c:256 [inline]tlb_flush_mmu+0x5b2/0x640 mm/mmu_gather.c:263tlb_finish_mmu+0x86/0x100 mm/mmu_gather.c:363exit_mmap+0x190/0x4d0 mm/mmap.c:3098__mmput+0x27/0x1b0 kernel/fork.c:1185mmput+0x3d/0x50 kernel/fork.c:1207copy_process+0x19fc/0x2100 kernel/fork.c:2518kernel_clone+0x166/0x550 kernel/fork.c:2671__do_sys_clone kernel/fork.c:2812 [inline]__se_sys_clone kernel/fork.c:2796 [inline]__x64_sys_clone+0xc3/0xf0 kernel/fork.c:2796do_syscall_x64 arch/x86/entry/common.c:50 [inline]do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80entry_SYSCALL_64_after_hwframe+0x63/0xcdread to 0xffffea00058fc1c8 of 8 bytes by task 17325 on cpu 1:page_is_pfmemalloc include/linux/mm.h:1817 [inline]__skb_fill_page_desc include/linux/skbuff.h:2432 [inline]skb_fill_page_desc include/linux/skbuff.h:2453 [inline]skb_append_pagefrags+0x210/0x600 net/core/skbuff.c:3974unix_stream_sendpage+0x45e/0x990 net/unix/af_unix.c:2338kernel_sendpage+0x184/0x300 net/socket.c:3561sock_sendpage+0x5a/0x70 net/socket.c:1054pipe_to_sendpage+0x128/0x160 fs/splice.c:361splice_from_pipe_feed fs/splice.c:415 [inline]__splice_from_pipe+0x222/0x4d0 fs/splice.c:559splice_from_pipe fs/splice.c:594 [inline]generic_splice_sendpage+0x89/0xc0 fs/splice.c:743do_splice_from fs/splice.c:764 [inline]direct_splice_actor+0x80/0xa0 fs/splice.c:931splice_direct_to_actor+0x305/0x620 fs/splice.c:886do_splice_direct+0xfb/0x180 fs/splice.c:974do_sendfile+0x3bf/0x910 fs/read_write.c:1255__do_sys_sendfile64 fs/read_write.c:1323 [inline]__se_sys_sendfile64 fs/read_write.c:1309 [inline]__x64_sys_sendfile64+0x10c/0x150 fs/read_write.c:1309do_syscall_x64 arch/x86/entry/common.c:50 [inline]do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80entry_SYSCALL_64_after_hwframe+0x63/0xcdvalue changed: 0x0000000000000000 -> 0xffffea00058fc188Reported by Kernel Concurrency Sanitizer on:CPU: 1 PID: 17325 Comm: syz-executor.0 Not tainted 6.1.0-rc1-syzkaller-00158-g440b7895c990-dirty #0Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/11/2022
 漏洞公开时间：2025-09-15 23:15:44
 漏洞创建时间：2025-09-15 23:31:33
 漏洞详情参考链接：
  https://nvd.nist.gov/vuln/detail/CVE-2022-50323
<details>
<summary>更多参考(点击展开)</summary>

| 参考来源 | 参考链接 | 来源链接 |
| ------- | -------- | -------- |
|  | https://git.kernel.org/stable/c/92b4c5c3fa810212da20088bcc6c0a77fc8607bd |  |
|  | https://lore.kernel.org/linux-cve-announce/2025091553-CVE-2022-50323-a29f@gregkh/T/#u |  |
|  | https://git.kernel.org/stable/c/228ebc41dfab5b5d34cd76835ddb0ca8ee12f513 |  |
|  | https://lore.kernel.org/linux-cve-announce/2025091553-CVE-2022-50323-a29f@gregkh/T |  |
|  | https://nvd.nist.gov/vuln/detail/CVE-2022-50323 |  |
|  | https://bugzilla.redhat.com/show_bug.cgi?id=2395275 |  |
|  | https://git.kernel.org/stable/c/847a2859814b31392340a2b16604b25afaa92dcc |  |
|  | https://ubuntu.com/security/CVE-2022-50323 |  |
|  | https://www.cve.org/CVERecord?id=CVE-2022-50323 |  |
|  | https://git.kernel.org/linus/228ebc41dfab5b5d34cd76835ddb0ca8ee12f513 |  |
|  | https://security-tracker.debian.org/tracker/CVE-2022-50323 |  |

</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:
  七彩瞬析开源风险感知平台
 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  |
| ------- | -------- | ------- | -------- | --------- |
| gregkh/linux |  | https://git.kernel.org/stable/c/92b4c5c3fa810212da20088bcc6c0a77fc8607bd |  | ljqc |
| gregkh/linux |  | https://git.kernel.org/stable/c/847a2859814b31392340a2b16604b25afaa92dcc |  | ljqc |
|  |  | https://git.kernel.org/stable/c/92b4c5c3fa810212da20088bcc6c0a77fc8607bd |  | cvelistv5 |
|  |  | https://git.kernel.org/stable/c/228ebc41dfab5b5d34cd76835ddb0ca8ee12f513 |  | cvelistv5 |
|  |  | https://git.kernel.org/stable/c/847a2859814b31392340a2b16604b25afaa92dcc |  | cvelistv5 |
|  |  | https://git.kernel.org/linus/228ebc41dfab5b5d34cd76835ddb0ca8ee12f513 |  | osv |

</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:net: do not sense pfmemalloc status in skb_append_pagefrags()skb_append_pagefrags() is used by af_unix and udp sendpage()implementation so far.In commit 326140063946 ( tcp: TX zerocopy should not sensepfmemalloc status ) we explained why we should not sensepfmemalloc status for pages owned by user space.We should also use skb_fill_page_desc_noacc()in skb_append_pagefrags() to avoid following KCSAN report:BUG: KCSAN: data-race in lru_add_fn / skb_append_pagefragswrite to 0xffffea00058fc1c8 of 8 bytes by task 17319 on cpu 0:__list_add include/linux/list.h:73 [inline]list_add include/linux/list.h:88 [inline]lruvec_add_folio include/linux/mm_inline.h:323 [inline]lru_add_fn+0x327/0x410 mm/swap.c:228folio_batch_move_lru+0x1e1/0x2a0 mm/swap.c:246lru_add_drain_cpu+0x73/0x250 mm/swap.c:669lru_add_drain+0x21/0x60 mm/swap.c:773free_pages_and_swap_cache+0x16/0x70 mm/swap_state.c:311tlb_batch_pages_flush mm/mmu_gather.c:59 [inline]tlb_flush_mmu_free mm/mmu_gather.c:256 [inline]tlb_flush_mmu+0x5b2/0x640 mm/mmu_gather.c:263tlb_finish_mmu+0x86/0x100 mm/mmu_gather.c:363exit_mmap+0x190/0x4d0 mm/mmap.c:3098__mmput+0x27/0x1b0 kernel/fork.c:1185mmput+0x3d/0x50 kernel/fork.c:1207copy_process+0x19fc/0x2100 kernel/fork.c:2518kernel_clone+0x166/0x550 kernel/fork.c:2671__do_sys_clone kernel/fork.c:2812 [inline]__se_sys_clone kernel/fork.c:2796 [inline]__x64_sys_clone+0xc3/0xf0 kernel/fork.c:2796do_syscall_x64 arch/x86/entry/common.c:50 [inline]do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80entry_SYSCALL_64_after_hwframe+0x63/0xcdread to 0xffffea00058fc1c8 of 8 bytes by task 17325 on cpu 1:page_is_pfmemalloc include/linux/mm.h:1817 [inline]__skb_fill_page_desc include/linux/skbuff.h:2432 [inline]skb_fill_page_desc include/linux/skbuff.h:2453 [inline]skb_append_pagefrags+0x210/0x600 net/core/skbuff.c:3974unix_stream_sendpage+0x45e/0x990 net/unix/af_unix.c:2338kernel_sendpage+0x184/0x300 net/socket.c:3561sock_sendpage+0x5a/0x70 net/socket.c:1054pipe_to_sendpage+0x128/0x160 fs/splice.c:361splice_from_pipe_feed fs/splice.c:415 [inline]__splice_from_pipe+0x222/0x4d0 fs/splice.c:559splice_from_pipe fs/splice.c:594 [inline]generic_splice_sendpage+0x89/0xc0 fs/splice.c:743do_splice_from fs/splice.c:764 [inline]direct_splice_actor+0x80/0xa0 fs/splice.c:931splice_direct_to_actor+0x305/0x620 fs/splice.c:886do_splice_direct+0xfb/0x180 fs/splice.c:974do_sendfile+0x3bf/0x910 fs/read_write.c:1255__do_sys_sendfile64 fs/read_write.c:1323 [inline]__se_sys_sendfile64 fs/read_write.c:1309 [inline]__x64_sys_sendfile64+0x10c/0x150 fs/read_write.c:1309do_syscall_x64 arch/x86/entry/common.c:50 [inline]do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80entry_SYSCALL_64_after_hwframe+0x63/0xcdvalue changed: 0x0000000000000000 -&gt; 0xffffea00058fc188Reported by Kernel Concurrency Sanitizer on:CPU: 1 PID: 17325 Comm: syz-executor.0 Not tainted 6.1.0-rc1-syzkaller-00158-g440b7895c990-dirty #0Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/11/2022The Linux kernel CVE team has assigned CVE-2022-50323 to this issue.
 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.master(6.12.33):不受影响
2.openEuler-20.03-LTS-SP4(4.19.90):不受影响
3.openEuler-22.03-LTS-SP3(5.10.0):受影响
4.openEuler-22.03-LTS-SP4(5.10.0):受影响
5.openEuler-24.03-LTS(6.6.0):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
8.openEuler-24.03-LTS-SP2(6.6.0):不受影响
9.openEuler-24.03-LTS-SP3(6.6.0):不受影响

修复是否涉及abi变化(是/否)：
  1.master(6.12.33):否
2.openEuler-20.03-LTS-SP4(4.19.90):否
3.openEuler-22.03-LTS-SP3(5.10.0):否
4.openEuler-22.03-LTS-SP4(5.10.0):否
5.openEuler-24.03-LTS(6.6.0):否
6.openEuler-24.03-LTS-Next(6.6.0):否
7.openEuler-24.03-LTS-SP1(6.6.0):否
8.openEuler-24.03-LTS-SP2(6.6.0):否
9.openEuler-24.03-LTS-SP3(6.6.0):否

原因说明：
  1.master(6.12.33):不受影响-漏洞代码不能被攻击者触发
2.openEuler-20.03-LTS-SP4(4.19.90):不受影响-漏洞代码不存在
3.openEuler-22.03-LTS-SP3(5.10.0):不修复-超出修复范围
4.openEuler-22.03-LTS-SP4(5.10.0):不修复-超出修复范围
5.openEuler-24.03-LTS(6.6.0):不受影响-漏洞代码不能被攻击者触发
6.openEuler-24.03-LTS-Next(6.6.0):不受影响-漏洞代码不能被攻击者触发
7.openEuler-24.03-LTS-SP1(6.6.0):不受影响-漏洞代码不能被攻击者触发
8.openEuler-24.03-LTS-SP2(6.6.0):不受影响-漏洞代码不能被攻击者触发
9.openEuler-24.03-LTS-SP3(6.6.0):不受影响-漏洞代码不能被攻击者触发

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