CVE-2024-26688

一、漏洞信息
 漏洞编号：[CVE-2024-26688](https://nvd.nist.gov/vuln/detail/CVE-2024-26688)
 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
 CVSS V2.0分值：
  BaseScore：0.0 Low
  Vector：CVSS：2.0/
 漏洞简述：
  In the Linux kernel, the following vulnerability has been resolved:fs,hugetlb: fix NULL pointer dereference in hugetlbs_fill_superWhen configuring a hugetlb filesystem via the fsconfig() syscall, there isa possible NULL dereference in hugetlbfs_fill_super() caused by assigningNULL to ctx->hstate in hugetlbfs_parse_param() when the requested pagesizeis non valid.E.g: Taking the following steps:     fd = fsopen( hugetlbfs , FSOPEN_CLOEXEC);     fsconfig(fd, FSCONFIG_SET_STRING,  pagesize ,  1024 , 0);     fsconfig(fd, FSCONFIG_CMD_CREATE, NULL, NULL, 0);Given that the requested  pagesize  is invalid, ctxt->hstate will be replacedwith NULL, losing its previous value, and we will print an error: ... ... case Opt_pagesize: ps = memparse(param->string, &rest); ctx->hstate = h; if (!ctx->hstate) {         pr_err( Unsupported page size %lu MB n , ps / SZ_1M);         return -EINVAL; } return 0; ... ...This is a problem because later on, we will dereference ctxt->hstate inhugetlbfs_fill_super() ... ... sb->s_blocksize = huge_page_size(ctx->hstate); ... ...Causing below Oops.Fix this by replacing cxt->hstate value only when then pagesize is knownto be valid. kernel: hugetlbfs: Unsupported page size 0 MB kernel: BUG: kernel NULL pointer dereference, address: 0000000000000028 kernel: #PF: supervisor read access in kernel mode kernel: #PF: error_code(0x0000) - not-present page kernel: PGD 800000010f66c067 P4D 800000010f66c067 PUD 1b22f8067 PMD 0 kernel: Oops: 0000 [#1] PREEMPT SMP PTI kernel: CPU: 4 PID: 5659 Comm: syscall Tainted: G            E      6.8.0-rc2-default+ #22 5a47c3fef76212addcc6eb71344aabc35190ae8f kernel: Hardware name: Intel Corp. GROVEPORT/GROVEPORT, BIOS GVPRCRB1.86B.0016.D04.1705030402 05/03/2017 kernel: RIP: 0010:hugetlbfs_fill_super+0xb4/0x1a0 kernel: Code: 48 8b 3b e8 3e c6 ed ff 48 85 c0 48 89 45 20 0f 84 d6 00 00 00 48 b8 ff ff ff ff ff ff ff 7f 4c 89 e7 49 89 44 24 20 48 8b 03 <8b> 48 28 b8 00 10 00 00 48 d3 e0 49 89 44 24 18 48 8b 03 8b 40 28 kernel: RSP: 0018:ffffbe9960fcbd48 EFLAGS: 00010246 kernel: RAX: 0000000000000000 RBX: ffff9af5272ae780 RCX: 0000000000372004 kernel: RDX: ffffffffffffffff RSI: ffffffffffffffff RDI: ffff9af555e9b000 kernel: RBP: ffff9af52ee66b00 R08: 0000000000000040 R09: 0000000000370004 kernel: R10: ffffbe9960fcbd48 R11: 0000000000000040 R12: ffff9af555e9b000 kernel: R13: ffffffffa66b86c0 R14: ffff9af507d2f400 R15: ffff9af507d2f400 kernel: FS:  00007ffbc0ba4740(0000) GS:ffff9b0bd7000000(0000) knlGS:0000000000000000 kernel: CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033 kernel: CR2: 0000000000000028 CR3: 00000001b1ee0000 CR4: 00000000001506f0 kernel: Call Trace: kernel:  <TASK> kernel:  ? __die_body+0x1a/0x60 kernel:  ? page_fault_oops+0x16f/0x4a0 kernel:  ? search_bpf_extables+0x65/0x70 kernel:  ? fixup_exception+0x22/0x310 kernel:  ? exc_page_fault+0x69/0x150 kernel:  ? asm_exc_page_fault+0x22/0x30 kernel:  ? __pfx_hugetlbfs_fill_super+0x10/0x10 kernel:  ? hugetlbfs_fill_super+0xb4/0x1a0 kernel:  ? hugetlbfs_fill_super+0x28/0x1a0 kernel:  ? __pfx_hugetlbfs_fill_super+0x10/0x10 kernel:  vfs_get_super+0x40/0xa0 kernel:  ? __pfx_bpf_lsm_capable+0x10/0x10 kernel:  vfs_get_tree+0x25/0xd0 kernel:  vfs_cmd_create+0x64/0xe0 kernel:  __x64_sys_fsconfig+0x395/0x410 kernel:  do_syscall_64+0x80/0x160 kernel:  ? syscall_exit_to_user_mode+0x82/0x240 kernel:  ? do_syscall_64+0x8d/0x160 kernel:  ? syscall_exit_to_user_mode+0x82/0x240 kernel:  ? do_syscall_64+0x8d/0x160 kernel:  ? exc_page_fault+0x69/0x150 kernel:  entry_SYSCALL_64_after_hwframe+0x6e/0x76 kernel: RIP: 0033:0x7ffbc0cb87c9 kernel: Code: 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 97 96 0d 00 f7 d8 64 89 01 48 kernel: RSP: 002b:00007ffc29d2f388 EFLAGS: 00000206 ORIG_RAX: 00000000000001af kernel: RAX: fffffffffff---truncated---
 漏洞公开时间：2024-04-03 23:15:52
 漏洞创建时间：2024-04-03 23:35:33
 漏洞详情参考链接：
  https://nvd.nist.gov/vuln/detail/CVE-2024-26688
<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/13c5a9fb07105557a1fa9efdb4f23d7ef30b7274 |  |
| 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | https://git.kernel.org/stable/c/1dde8ef4b7a749ae1bc73617c91775631d167557 |  |
| 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | https://git.kernel.org/stable/c/22850c9950a4e43a67299755d11498f3292d02ff |  |
| 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | https://git.kernel.org/stable/c/2e2c07104b4904aed1389a59b25799b95a85b5b9 |  |
| 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | https://git.kernel.org/stable/c/79d72c68c58784a3e1cd2378669d51bfd0cb7498 |  |
| 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | https://git.kernel.org/stable/c/80d852299987a8037be145a94f41874228f1a773 |  |
| 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | https://git.kernel.org/stable/c/ec78418801ef7b0c22cd6a30145ec480dd48db39 |  |
| suse_bugzilla | http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2024-26688 | https://bugzilla.suse.com/show_bug.cgi?id=1222482 |
| suse_bugzilla | https://www.cve.org/CVERecord?id=CVE-2024-26688 | https://bugzilla.suse.com/show_bug.cgi?id=1222482 |
| suse_bugzilla | https://git.kernel.org/stable/c/13c5a9fb07105557a1fa9efdb4f23d7ef30b7274 | https://bugzilla.suse.com/show_bug.cgi?id=1222482 |
| suse_bugzilla | https://git.kernel.org/stable/c/1dde8ef4b7a749ae1bc73617c91775631d167557 | https://bugzilla.suse.com/show_bug.cgi?id=1222482 |
| suse_bugzilla | https://git.kernel.org/stable/c/22850c9950a4e43a67299755d11498f3292d02ff | https://bugzilla.suse.com/show_bug.cgi?id=1222482 |
| suse_bugzilla | https://git.kernel.org/stable/c/2e2c07104b4904aed1389a59b25799b95a85b5b9 | https://bugzilla.suse.com/show_bug.cgi?id=1222482 |
| suse_bugzilla | https://git.kernel.org/stable/c/79d72c68c58784a3e1cd2378669d51bfd0cb7498 | https://bugzilla.suse.com/show_bug.cgi?id=1222482 |
| suse_bugzilla | https://git.kernel.org/stable/c/80d852299987a8037be145a94f41874228f1a773 | https://bugzilla.suse.com/show_bug.cgi?id=1222482 |
| suse_bugzilla | https://git.kernel.org/stable/c/ec78418801ef7b0c22cd6a30145ec480dd48db39 | https://bugzilla.suse.com/show_bug.cgi?id=1222482 |
| suse_bugzilla | https://bugzilla.redhat.com/show_bug.cgi?id=2273105 | https://bugzilla.suse.com/show_bug.cgi?id=1222482 |
| redhat_bugzilla | https://lore.kernel.org/linux-cve-announce/2024040336-CVE-2024-26688-7b0e@gregkh/T | https://bugzilla.redhat.com/show_bug.cgi?id=2273105 |
| ubuntu | https://git.kernel.org/linus/79d72c68c58784a3e1cd2378669d51bfd0cb7498 (6.8-rc4) | https://ubuntu.com/security/CVE-2024-26688 |
| ubuntu | https://git.kernel.org/stable/c/1dde8ef4b7a749ae1bc73617c91775631d167557 | https://ubuntu.com/security/CVE-2024-26688 |
| ubuntu | https://git.kernel.org/stable/c/80d852299987a8037be145a94f41874228f1a773 | https://ubuntu.com/security/CVE-2024-26688 |
| ubuntu | https://git.kernel.org/stable/c/22850c9950a4e43a67299755d11498f3292d02ff | https://ubuntu.com/security/CVE-2024-26688 |
| ubuntu | https://git.kernel.org/stable/c/2e2c07104b4904aed1389a59b25799b95a85b5b9 | https://ubuntu.com/security/CVE-2024-26688 |
| ubuntu | https://git.kernel.org/stable/c/13c5a9fb07105557a1fa9efdb4f23d7ef30b7274 | https://ubuntu.com/security/CVE-2024-26688 |
| ubuntu | https://git.kernel.org/stable/c/ec78418801ef7b0c22cd6a30145ec480dd48db39 | https://ubuntu.com/security/CVE-2024-26688 |
| ubuntu | https://git.kernel.org/stable/c/79d72c68c58784a3e1cd2378669d51bfd0cb7498 | https://ubuntu.com/security/CVE-2024-26688 |
| ubuntu | https://www.cve.org/CVERecord?id=CVE-2024-26688 | https://ubuntu.com/security/CVE-2024-26688 |
| ubuntu | https://nvd.nist.gov/vuln/detail/CVE-2024-26688 | https://ubuntu.com/security/CVE-2024-26688 |
| ubuntu | https://launchpad.net/bugs/cve/CVE-2024-26688 | https://ubuntu.com/security/CVE-2024-26688 |
| ubuntu | https://security-tracker.debian.org/tracker/CVE-2024-26688 | https://ubuntu.com/security/CVE-2024-26688 |
| debian |  | https://security-tracker.debian.org/tracker/CVE-2024-26688 |
| ubuntu | https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-26688 | https://ubuntu.com/security/CVE-2024-26688 |

</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  |
| ------- | -------- | ------- | -------- | --------- |
| linux |  | https://git.kernel.org/linus/79d72c68c58784a3e1cd2378669d51bfd0cb7498 | https://git.kernel.org/linus/32021982a324dce93b4ae00c06213bf45fb319c8 | ubuntu |

</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:fs,hugetlb: fix NULL pointer dereference in hugetlbs_fill_superWhen configuring a hugetlb filesystem via the fsconfig() syscall, there isa possible NULL dereference in hugetlbfs_fill_super() caused by assigningNULL to ctx->hstate in hugetlbfs_parse_param() when the requested pagesizeis non valid.E.g: Taking the following steps:     fd = fsopen( hugetlbfs , FSOPEN_CLOEXEC);     fsconfig(fd, FSCONFIG_SET_STRING,  pagesize ,  1024 , 0);     fsconfig(fd, FSCONFIG_CMD_CREATE, NULL, NULL, 0);Given that the requested  pagesize  is invalid, ctxt->hstate will be replacedwith NULL, losing its previous value, and we will print an error: ... ... case Opt_pagesize: ps = memparse(param->string, &rest); ctx->hstate = h; if (!ctx->hstate) {         pr_err( Unsupported page size %lu MB n , ps / SZ_1M);         return -EINVAL; } return 0; ... ...This is a problem because later on, we will dereference ctxt->hstate inhugetlbfs_fill_super() ... ... sb->s_blocksize = huge_page_size(ctx->hstate); ... ...Causing below Oops.Fix this by replacing cxt->hstate value only when then pagesize is knownto be valid. kernel: hugetlbfs: Unsupported page size 0 MB kernel: BUG: kernel NULL pointer dereference, address: 0000000000000028 kernel: #PF: supervisor read access in kernel mode kernel: #PF: error_code(0x0000) - not-present page kernel: PGD 800000010f66c067 P4D 800000010f66c067 PUD 1b22f8067 PMD 0 kernel: Oops: 0000 [#1] PREEMPT SMP PTI kernel: CPU: 4 PID: 5659 Comm: syscall Tainted: G            E      6.8.0-rc2-default+ #22 5a47c3fef76212addcc6eb71344aabc35190ae8f kernel: Hardware name: Intel Corp. GROVEPORT/GROVEPORT, BIOS GVPRCRB1.86B.0016.D04.1705030402 05/03/2017 kernel: RIP: 0010:hugetlbfs_fill_super+0xb4/0x1a0 kernel: Code: 48 8b 3b e8 3e c6 ed ff 48 85 c0 48 89 45 20 0f 84 d6 00 00 00 48 b8 ff ff ff ff ff ff ff 7f 4c 89 e7 49 89 44 24 20 48 8b 03 <8b> 48 28 b8 00 10 00 00 48 d3 e0 49 89 44 24 18 48 8b 03 8b 40 28 kernel: RSP: 0018:ffffbe9960fcbd48 EFLAGS: 00010246 kernel: RAX: 0000000000000000 RBX: ffff9af5272ae780 RCX: 0000000000372004 kernel: RDX: ffffffffffffffff RSI: ffffffffffffffff RDI: ffff9af555e9b000 kernel: RBP: ffff9af52ee66b00 R08: 0000000000000040 R09: 0000000000370004 kernel: R10: ffffbe9960fcbd48 R11: 0000000000000040 R12: ffff9af555e9b000 kernel: R13: ffffffffa66b86c0 R14: ffff9af507d2f400 R15: ffff9af507d2f400 kernel: FS:  00007ffbc0ba4740(0000) GS:ffff9b0bd7000000(0000) knlGS:0000000000000000 kernel: CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033 kernel: CR2: 0000000000000028 CR3: 00000001b1ee0000 CR4: 00000000001506f0 kernel: Call Trace: kernel:  <TASK> kernel:  ? __die_body+0x1a/0x60 kernel:  ? page_fault_oops+0x16f/0x4a0 kernel:  ? search_bpf_extables+0x65/0x70 kernel:  ? fixup_exception+0x22/0x310 kernel:  ? exc_page_fault+0x69/0x150 kernel:  ? asm_exc_page_fault+0x22/0x30 kernel:  ? __pfx_hugetlbfs_fill_super+0x10/0x10 kernel:  ? hugetlbfs_fill_super+0xb4/0x1a0 kernel:  ? hugetlbfs_fill_super+0x28/0x1a0 kernel:  ? __pfx_hugetlbfs_fill_super+0x10/0x10 kernel:  vfs_get_super+0x40/0xa0 kernel:  ? __pfx_bpf_lsm_capable+0x10/0x10 kernel:  vfs_get_tree+0x25/0xd0 kernel:  vfs_cmd_create+0x64/0xe0 kernel:  __x64_sys_fsconfig+0x395/0x410 kernel:  do_syscall_64+0x80/0x160 kernel:  ? syscall_exit_to_user_mode+0x82/0x240 kernel:  ? do_syscall_64+0x8d/0x160 kernel:  ? syscall_exit_to_user_mode+0x82/0x240 kernel:  ? do_syscall_64+0x8d/0x160 kernel:  ? exc_page_fault+0x69/0x150 kernel:  entry_SYSCALL_64_after_hwframe+0x6e/0x76 kernel: RIP: 0033:0x7ffbc0cb87c9 kernel: Code: 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 97 96 0d 00 f7 d8 64 89 01 48 kernel: RSP: 002b:00007ffc29d2f388 EFLAGS: 00000206 ORIG_RAX: 00000000000001af kernel: RAX: fffffffffff---truncated--- 
 openEuler评分：
  5.5
 Vector：CVSS：2.0/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-22.03-LTS(5.10.0):受影响
2.openEuler-22.03-LTS-SP1(5.10.0):受影响
3.openEuler-22.03-LTS-SP2(5.10.0):受影响
4.openEuler-22.03-LTS-SP3(5.10.0):受影响
5.openEuler-20.03-LTS-SP1(4.19.90):不受影响
6.openEuler-20.03-LTS-SP4(4.19.90):不受影响
7.master(6.1.0):不受影响
8.openEuler-22.03-LTS-Next(5.10.0):不受影响
9.openEuler-24.03-LTS:不受影响
10.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-SP1(4.19.90):否
2.openEuler-20.03-LTS-SP4(4.19.90):否
3.openEuler-22.03-LTS(5.10.0):否
4.openEuler-22.03-LTS-SP1(5.10.0):否
5.openEuler-22.03-LTS-SP2(5.10.0):否
6.openEuler-22.03-LTS-SP3(5.10.0):否
7.master(6.1.0):否
8.openEuler-22.03-LTS-Next(5.10.0):否
9.openEuler-24.03-LTS:否
10.openEuler-24.03-LTS-Next:否

三、漏洞修复
安全公告链接：https://www.openeuler.org/zh/security/safety-bulletin/detail/?id=openEuler-SA-2024-1622

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