CVE-2025-21949

一、漏洞信息
 漏洞编号：[CVE-2025-21949](https://nvd.nist.gov/vuln/detail/CVE-2025-21949)
 漏洞归属组件：[kernel](https://gitee.com/src-openeuler/kernel)
 漏洞归属的版本：4.19.140,4.19.194,4.19.90,5.10.0,6.1.19,6.1.8,6.4.0,6.6.0
 CVSS V3.0分值：
  BaseScore：5.5 Medium
  Vector：CVSS：3.0/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:LoongArch: Set hugetlb mmap base address aligned with pmd sizeWith ltp test case  testcases/bin/hugefork02 , there is a dmesg errorreport message such as: kernel BUG at mm/hugetlb.c:5550! Oops - BUG[#1]: CPU: 0 UID: 0 PID: 1517 Comm: hugefork02 Not tainted 6.14.0-rc2+ #241 Hardware name: QEMU QEMU Virtual Machine, BIOS unknown 2/2/2022 pc 90000000004eaf1c ra 9000000000485538 tp 900000010edbc000 sp 900000010edbf940 a0 900000010edbfb00 a1 9000000108d20280 a2 00007fffe9474000 a3 00007ffff3474000 a4 0000000000000000 a5 0000000000000003 a6 00000000003cadd3 a7 0000000000000000 t0 0000000001ffffff t1 0000000001474000 t2 900000010ecd7900 t3 00007fffe9474000 t4 00007fffe9474000 t5 0000000000000040 t6 900000010edbfb00 t7 0000000000000001 t8 0000000000000005 u0 90000000004849d0 s9 900000010edbfa00 s0 9000000108d20280 s1 00007fffe9474000 s2 0000000002000000 s3 9000000108d20280 s4 9000000002b38b10 s5 900000010edbfb00 s6 00007ffff3474000 s7 0000000000000406 s8 900000010edbfa08    ra: 9000000000485538 unmap_vmas+0x130/0x218   ERA: 90000000004eaf1c __unmap_hugepage_range+0x6f4/0x7d0  PRMD: 00000004 (PPLV0 +PIE -PWE)  EUEN: 00000007 (+FPE +SXE +ASXE -BTE)  ECFG: 00071c1d (LIE=0,2-4,10-12 VS=7) ESTAT: 000c0000 [BRK] (IS= ECode=12 EsubCode=0) PRID: 0014c010 (Loongson-64bit, Loongson-3A5000) Process hugefork02 (pid: 1517, threadinfo=00000000a670eaf4, task=000000007a95fc64) Call Trace: [<90000000004eaf1c>] __unmap_hugepage_range+0x6f4/0x7d0 [<9000000000485534>] unmap_vmas+0x12c/0x218 [<9000000000494068>] exit_mmap+0xe0/0x308 [<900000000025fdc4>] mmput+0x74/0x180 [<900000000026a284>] do_exit+0x294/0x898 [<900000000026aa30>] do_group_exit+0x30/0x98 [<900000000027bed4>] get_signal+0x83c/0x868 [<90000000002457b4>] arch_do_signal_or_restart+0x54/0xfa0 [<90000000015795e8>] irqentry_exit_to_user_mode+0xb8/0x138 [<90000000002572d0>] tlb_do_page_fault_1+0x114/0x1b4The problem is that base address allocated from hugetlbfs is not alignedwith pmd size. Here add a checking for hugetlbfs and align base addresswith pmd size. After this patch the test case  testcases/bin/hugefork02 passes to run.This is similar to the commit 7f24cbc9c4d42db8a3c8484d1 ( mm/mmap: teachgeneric_get_unmapped_area{_topdown} to handle hugetlb mappings ).
 漏洞公开时间：2025-04-02 00:15:26
 漏洞创建时间：2025-04-02 01:35:58
 漏洞详情参考链接：
  https://nvd.nist.gov/vuln/detail/CVE-2025-21949
<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/242b34f48a377afe4b285b472bd0f17744fca8e8 |  |
| 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | https://git.kernel.org/stable/c/3109d5ff484b7bc7b955f166974c6776d91f247b |  |
| suse_bugzilla | http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2025-21949 | https://bugzilla.suse.com/show_bug.cgi?id=1240652 |
| suse_bugzilla | https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2025/CVE-2025-21949.mbox | https://bugzilla.suse.com/show_bug.cgi?id=1240652 |
| suse_bugzilla | https://git.kernel.org/stable/c/242b34f48a377afe4b285b472bd0f17744fca8e8 | https://bugzilla.suse.com/show_bug.cgi?id=1240652 |
| suse_bugzilla | https://git.kernel.org/stable/c/3109d5ff484b7bc7b955f166974c6776d91f247b | https://bugzilla.suse.com/show_bug.cgi?id=1240652 |
| suse_bugzilla | https://www.cve.org/CVERecord?id=CVE-2025-21949 | https://bugzilla.suse.com/show_bug.cgi?id=1240652 |
| suse_bugzilla | https://bugzilla.redhat.com/show_bug.cgi?id=2356622 | https://bugzilla.suse.com/show_bug.cgi?id=1240652 |
| redhat_bugzilla | https://lore.kernel.org/linux-cve-announce/2025040136-CVE-2025-21949-e05a@gregkh/T | https://bugzilla.redhat.com/show_bug.cgi?id=2356622 |
| anolis |  | https://anas.openanolis.cn/cves/detail/CVE-2025-21949 |

</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/242b34f48a377afe4b285b472bd0f17744fca8e8 |  | nvd |
|  |  | https://git.kernel.org/stable/c/3109d5ff484b7bc7b955f166974c6776d91f247b |  | nvd |
| linux_kernel | 6.13.7 | https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=242b34f48a377afe4b285b472bd0f17744fca8e8Fixed |  | linuxkernelcves |
| linux_kernel | 6.14 | https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=3109d5ff484b7bc7b955f166974c6776d91f247bPlease |  | linuxkernelcves |

</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:LoongArch: Set hugetlb mmap base address aligned with pmd sizeWith ltp test case  testcases/bin/hugefork02 , there is a dmesg errorreport message such as: kernel BUG at mm/hugetlb.c:5550! Oops - BUG[#1]: CPU: 0 UID: 0 PID: 1517 Comm: hugefork02 Not tainted 6.14.0-rc2+ #241 Hardware name: QEMU QEMU Virtual Machine, BIOS unknown 2/2/2022 pc 90000000004eaf1c ra 9000000000485538 tp 900000010edbc000 sp 900000010edbf940 a0 900000010edbfb00 a1 9000000108d20280 a2 00007fffe9474000 a3 00007ffff3474000 a4 0000000000000000 a5 0000000000000003 a6 00000000003cadd3 a7 0000000000000000 t0 0000000001ffffff t1 0000000001474000 t2 900000010ecd7900 t3 00007fffe9474000 t4 00007fffe9474000 t5 0000000000000040 t6 900000010edbfb00 t7 0000000000000001 t8 0000000000000005 u0 90000000004849d0 s9 900000010edbfa00 s0 9000000108d20280 s1 00007fffe9474000 s2 0000000002000000 s3 9000000108d20280 s4 9000000002b38b10 s5 900000010edbfb00 s6 00007ffff3474000 s7 0000000000000406 s8 900000010edbfa08    ra: 9000000000485538 unmap_vmas+0x130/0x218   ERA: 90000000004eaf1c __unmap_hugepage_range+0x6f4/0x7d0  PRMD: 00000004 (PPLV0 +PIE -PWE)  EUEN: 00000007 (+FPE +SXE +ASXE -BTE)  ECFG: 00071c1d (LIE=0,2-4,10-12 VS=7) ESTAT: 000c0000 [BRK] (IS= ECode=12 EsubCode=0) PRID: 0014c010 (Loongson-64bit, Loongson-3A5000) Process hugefork02 (pid: 1517, threadinfo=00000000a670eaf4, task=000000007a95fc64) Call Trace: [<90000000004eaf1c>] __unmap_hugepage_range+0x6f4/0x7d0 [<9000000000485534>] unmap_vmas+0x12c/0x218 [<9000000000494068>] exit_mmap+0xe0/0x308 [<900000000025fdc4>] mmput+0x74/0x180 [<900000000026a284>] do_exit+0x294/0x898 [<900000000026aa30>] do_group_exit+0x30/0x98 [<900000000027bed4>] get_signal+0x83c/0x868 [<90000000002457b4>] arch_do_signal_or_restart+0x54/0xfa0 [<90000000015795e8>] irqentry_exit_to_user_mode+0xb8/0x138 [<90000000002572d0>] tlb_do_page_fault_1+0x114/0x1b4The problem is that base address allocated from hugetlbfs is not alignedwith pmd size. Here add a checking for hugetlbfs and align base addresswith pmd size. After this patch the test case  testcases/bin/hugefork02 passes to run.This is similar to the commit 7f24cbc9c4d42db8a3c8484d1 ( mm/mmap: teachgeneric_get_unmapped_area{_topdown} to handle hugetlb mappings ).
 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-24.03-LTS(6.6.0):受影响
2.openEuler-24.03-LTS-SP1(6.6.0):受影响
3.openEuler-24.03-LTS-SP2(6.6.0):受影响
4.openEuler-20.03-LTS-SP4(4.19.90):不受影响
5.openEuler-22.03-LTS-SP3(5.10.0):不受影响
6.openEuler-22.03-LTS-SP4(5.10.0):不受影响
7.master(6.6.0):不受影响
8.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-SP3(5.10.0):否
3.master(6.6.0):否
4.openEuler-24.03-LTS(6.6.0):否
5.openEuler-24.03-LTS-Next(6.6.0):否
6.openEuler-22.03-LTS-SP4(5.10.0):否
7.openEuler-24.03-LTS-SP1(6.6.0):否
8.openEuler-24.03-LTS-SP2(6.6.0):否

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

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