CVE-2021-47126: Software Security Vulnerability Vulnerability

MODERATE
Advisory Identifier: GHSA-q96w-v39p-hcjw
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CVSS 5.5
CWE-125
Published
Advisory Summary

CVE-2021-47126 is a MODERATE (CVSS 5.5) security vulnerability vulnerability (CWE-125: Out-of-bounds Read) affecting Software libraries in the Maven ecosystem. The weakness occurs when the product reads data past the end, or before the beginning, of the intended buffer.. Remediation is available in the latest vendor maintenance releases.

CVE-2021-47126 at a Glance

CVE Identifier CVE-2021-47126
GHSA Identifier GHSA-q96w-v39p-hcjw
Severity MODERATE
CVSS v3.1 Base Score 5.5
CWE Classification CWE-125: Out-of-bounds Read
Affected Product Software
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 5.5

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H).

Attack Vector Local (AV:L)
Attack Complexity Low (AC:L)
Privileges Required Low (PR:L)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality None (C:N)
Integrity None (I:N)
Availability High (A:H)

How to Fix CVE-2021-47126

To remediate this vulnerability, upgrade all affected Software dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

mvn dependency:tree

How to Check if You Are Affected

To determine whether your Java application is affected by CVE-2021-47126, inspect your build dependencies using the Maven Dependency Plugin:

mvn dependency:tree

Analyze the terminal output to locate any version of Software in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than the patched release), your application is affected.

Note: The mvn dependency:tree command inspects the resolved dependency graph declared in your project's POM files; it does not perform automated security scanning or inspect runtime dynamic classpaths. Always verify runtime container classpaths and shaded JARs.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-125: Out-of-bounds Read, where the product reads data past the end, or before the beginning, of the intended buffer. In Software, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

In the Linux kernel, the following vulnerability has been resolved: ipv6: Fix KASAN: slab-out-of-bounds Read in fib6_nh_flush_exceptions Reported by syzbot: HEAD commit: 90c911ad Merge tag 'fixes' of git://git.kernel.org/pub/scm.. git tree: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master dashboard link: https://syzkaller.appspot.com/bug?extid=123aa35098fd3c000eb7 compiler: Debian clang version 11.0.1-2 ================================================================== BUG: KASAN: slab-out-of-bounds in fib6_nh_get_excptn_bucket net/ipv6/route.c:1604 [inline] BUG: KASAN: slab-out-of-bounds in fib6_nh_flush_exceptions+0xbd/0x360 net/ipv6/route.c:1732 Read of size 8 at addr ffff8880145c78f8 by task syz-executor.4/17760 CPU: 0 PID: 17760 Comm: syz-executor.4 Not tainted 5.12.0-rc8-syzkaller #0 Call Trace: <IRQ> __dump_stack lib/dump_stack.c:79 [inline] dump_stack+0x202/0x31e lib/dump_stack.c:120 print_address_description+0x5f/0x3b0 mm/kasan/report.c:232 __kasan_report mm/kasan/report.c:399 [inline] kasan_report+0x15c/0x200 mm/kasan/report.c:416 fib6_nh_get_excptn_bucket net/ipv6/route.c:1604 [inline] fib6_nh_flush_exceptions+0xbd/0x360 net/ipv6/route.c:1732 fib6_nh_release+0x9a/0x430 net/ipv6/route.c:3536 fib6_info_destroy_rcu+0xcb/0x1c0 net/ipv6/ip6_fib.c:174 rcu_do_batch kernel/rcu/tree.c:2559 [inline] rcu_core+0x8f6/0x1450 kernel/rcu/tree.c:2794 __do_softirq+0x372/0x7a6 kernel/softirq.c:345 invoke_softirq kernel/softirq.c:221 [inline] __irq_exit_rcu+0x22c/0x260 kernel/softirq.c:422 irq_exit_rcu+0x5/0x20 kernel/softirq.c:434 sysvec_apic_timer_interrupt+0x91/0xb0 arch/x86/kernel/apic/apic.c:1100 </IRQ> asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:632 RIP: 0010:lock_acquire+0x1f6/0x720 kernel/locking/lockdep.c:5515 Code: f6 84 24 a1 00 00 00 02 0f 85 8d 02 00 00 f7 c3 00 02 00 00 49 bd 00 00 00 00 00 fc ff df 74 01 fb 48 c7 44 24 40 0e 36 e0 45 <4b> c7 44 3d 00 00 00 00 00 4b c7 44 3d 09 00 00 00 00 43 c7 44 3d RSP: 0018:ffffc90009e06560 EFLAGS: 00000206 RAX: 1ffff920013c0cc0 RBX: 0000000000000246 RCX: dffffc0000000000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc90009e066e0 R08: dffffc0000000000 R09: fffffbfff1f992b1 R10: fffffbfff1f992b1 R11: 0000000000000000 R12: 0000000000000000 R13: dffffc0000000000 R14: 0000000000000000 R15: 1ffff920013c0cb4 rcu_lock_acquire+0x2a/0x30 include/linux/rcupdate.h:267 rcu_read_lock include/linux/rcupdate.h:656 [inline] ext4_get_group_info+0xea/0x340 fs/ext4/ext4.h:3231 ext4_mb_prefetch+0x123/0x5d0 fs/ext4/mballoc.c:2212 ext4_mb_regular_allocator+0x8a5/0x28f0 fs/ext4/mballoc.c:2379 ext4_mb_new_blocks+0xc6e/0x24f0 fs/ext4/mballoc.c:4982 ext4_ext_map_blocks+0x2be3/0x7210 fs/ext4/extents.c:4238 ext4_map_blocks+0xab3/0x1cb0 fs/ext4/inode.c:638 ext4_getblk+0x187/0x6c0 fs/ext4/inode.c:848 ext4_bread+0x2a/0x1c0 fs/ext4/inode.c:900 ext4_append+0x1a4/0x360 fs/ext4/namei.c:67 ext4_init_new_dir+0x337/0xa10 fs/ext4/namei.c:2768 ext4_mkdir+0x4b8/0xc00 fs/ext4/namei.c:2814 vfs_mkdir+0x45b/0x640 fs/namei.c:3819 ovl_do_mkdir fs/overlayfs/overlayfs.h:161 [inline] ovl_mkdir_real+0x53/0x1a0 fs/overlayfs/dir.c:146 ovl_create_real+0x280/0x490 fs/overlayfs/dir.c:193 ovl_workdir_create+0x425/0x600 fs/overlayfs/super.c:788 ovl_make_workdir+0xed/0x1140 fs/overlayfs/super.c:1355 ovl_get_workdir fs/overlayfs/super.c:1492 [inline] ovl_fill_super+0x39ee/0x5370 fs/overlayfs/super.c:2035 mount_nodev+0x52/0xe0 fs/super.c:1413 legacy_get_tree+0xea/0x180 fs/fs_context.c:592 vfs_get_tree+0x86/0x270 fs/super.c:1497 do_new_mount fs/namespace.c:2903 [inline] path_mount+0x196f/0x2be0 fs/namespace.c:3233 do_mount fs/namespace.c:3246 [inline] __do_sys_mount fs/namespace.c:3454 [inline] __se_sys_mount+0x2f9/0x3b0 fs/namespace.c:3431 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x4665f9 Code: ff ff c3 66 2e 0f 1f 84 ---truncated---

References

NVD — CVE-2021-47126 NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-47126
git.kernel.org/stable/c/0987023582... WEB
https://git.kernel.org/stable/c/09870235827451409ff546b073d754a19fd17e2e
git.kernel.org/stable/c/0a462e25ef... WEB
https://git.kernel.org/stable/c/0a462e25ef0f7ab305081a08d435bbd1f13c0a94
git.kernel.org/stable/c/7ba7fa78a9... WEB
https://git.kernel.org/stable/c/7ba7fa78a92dc410b6f93ed73075ab669c3a0b59
git.kernel.org/stable/c/821bbf79fe... WEB
https://git.kernel.org/stable/c/821bbf79fe46a8b1d18aa456e8ed0a3c208c3754

Frequently Asked Questions

What is CVE-2021-47126?
CVE-2021-47126 is a security vulnerability in Software classified as a security vulnerability vulnerability under CWE-125: Out-of-bounds Read.
Which Software versions are affected?
Affected versions include releases prior to current release patches.
What version fixes CVE-2021-47126?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What is the CVSS score of CVE-2021-47126?
CVE-2021-47126 has a CVSS v3.1 base score of 5.5 (MODERATE) with vector string CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.
What CWE is associated with CVE-2021-47126?
CVE-2021-47126 is classified under CWE-125: Out-of-bounds Read (The product reads data past the end, or before the beginning, of the intended buffer.).
How can I check Maven dependencies for CVE-2021-47126?
Run the dependency tree command: 'mvn dependency:tree'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-q96w-v39p-hcjw",
  "modified" : "2024-11-06T18:31:03Z",
  "published" : "2024-03-15T21:30:44Z",
  "aliases" : [ "CVE-2021-47126" ],
  "details" : "In the Linux kernel, the following vulnerability has been resolved:\n\nipv6: Fix KASAN: slab-out-of-bounds Read in fib6_nh_flush_exceptions\n\nReported by syzbot:\nHEAD commit:    90c911ad Merge tag 'fixes' of git://git.kernel.org/pub/scm..\ngit tree:       git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master\ndashboard link: https://syzkaller.appspot.com/bug?extid=123aa35098fd3c000eb7\ncompiler:       Debian clang version 11.0.1-2\n\n==================================================================\nBUG: KASAN: slab-out-of-bounds in fib6_nh_get_excptn_bucket net/ipv6/route.c:1604 [inline]\nBUG: KASAN: slab-out-of-bounds in fib6_nh_flush_exceptions+0xbd/0x360 net/ipv6/route.c:1732\nRead of size 8 at addr ffff8880145c78f8 by task syz-executor.4/17760\n\nCPU: 0 PID: 17760 Comm: syz-executor.4 Not tainted 5.12.0-rc8-syzkaller #0\nCall Trace:\n <IRQ>\n __dump_stack lib/dump_stack.c:79 [inline]\n dump_stack+0x202/0x31e lib/dump_stack.c:120\n print_address_description+0x5f/0x3b0 mm/kasan/report.c:232\n __kasan_report mm/kasan/report.c:399 [inline]\n kasan_report+0x15c/0x200 mm/kasan/report.c:416\n fib6_nh_get_excptn_bucket net/ipv6/route.c:1604 [inline]\n fib6_nh_flush_exceptions+0xbd/0x360 net/ipv6/route.c:1732\n fib6_nh_release+0x9a/0x430 net/ipv6/route.c:3536\n fib6_info_destroy_rcu+0xcb/0x1c0 net/ipv6/ip6_fib.c:174\n rcu_do_batch kernel/rcu/tree.c:2559 [inline]\n rcu_core+0x8f6/0x1450 kernel/rcu/tree.c:2794\n __do_softirq+0x372/0x7a6 kernel/softirq.c:345\n invoke_softirq kernel/softirq.c:221 [inline]\n __irq_exit_rcu+0x22c/0x260 kernel/softirq.c:422\n irq_exit_rcu+0x5/0x20 kernel/softirq.c:434\n sysvec_apic_timer_interrupt+0x91/0xb0 arch/x86/kernel/apic/apic.c:1100\n </IRQ>\n asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:632\nRIP: 0010:lock_acquire+0x1f6/0x720 kernel/locking/lockdep.c:5515\nCode: f6 84 24 a1 00 00 00 02 0f 85 8d 02 00 00 f7 c3 00 02 00 00 49 bd 00 00 00 00 00 fc ff df 74 01 fb 48 c7 44 24 40 0e 36 e0 45 <4b> c7 44 3d 00 00 00 00 00 4b c7 44 3d 09 00 00 00 00 43 c7 44 3d\nRSP: 0018:ffffc90009e06560 EFLAGS: 00000206\nRAX: 1ffff920013c0cc0 RBX: 0000000000000246 RCX: dffffc0000000000\nRDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000\nRBP: ffffc90009e066e0 R08: dffffc0000000000 R09: fffffbfff1f992b1\nR10: fffffbfff1f992b1 R11: 0000000000000000 R12: 0000000000000000\nR13: dffffc0000000000 R14: 0000000000000000 R15: 1ffff920013c0cb4\n rcu_lock_acquire+0x2a/0x30 include/linux/rcupdate.h:267\n rcu_read_lock include/linux/rcupdate.h:656 [inline]\n ext4_get_group_info+0xea/0x340 fs/ext4/ext4.h:3231\n ext4_mb_prefetch+0x123/0x5d0 fs/ext4/mballoc.c:2212\n ext4_mb_regular_allocator+0x8a5/0x28f0 fs/ext4/mballoc.c:2379\n ext4_mb_new_blocks+0xc6e/0x24f0 fs/ext4/mballoc.c:4982\n ext4_ext_map_blocks+0x2be3/0x7210 fs/ext4/extents.c:4238\n ext4_map_blocks+0xab3/0x1cb0 fs/ext4/inode.c:638\n ext4_getblk+0x187/0x6c0 fs/ext4/inode.c:848\n ext4_bread+0x2a/0x1c0 fs/ext4/inode.c:900\n ext4_append+0x1a4/0x360 fs/ext4/namei.c:67\n ext4_init_new_dir+0x337/0xa10 fs/ext4/namei.c:2768\n ext4_mkdir+0x4b8/0xc00 fs/ext4/namei.c:2814\n vfs_mkdir+0x45b/0x640 fs/namei.c:3819\n ovl_do_mkdir fs/overlayfs/overlayfs.h:161 [inline]\n ovl_mkdir_real+0x53/0x1a0 fs/overlayfs/dir.c:146\n ovl_create_real+0x280/0x490 fs/overlayfs/dir.c:193\n ovl_workdir_create+0x425/0x600 fs/overlayfs/super.c:788\n ovl_make_workdir+0xed/0x1140 fs/overlayfs/super.c:1355\n ovl_get_workdir fs/overlayfs/super.c:1492 [inline]\n ovl_fill_super+0x39ee/0x5370 fs/overlayfs/super.c:2035\n mount_nodev+0x52/0xe0 fs/super.c:1413\n legacy_get_tree+0xea/0x180 fs/fs_context.c:592\n vfs_get_tree+0x86/0x270 fs/super.c:1497\n do_new_mount fs/namespace.c:2903 [inline]\n path_mount+0x196f/0x2be0 fs/namespace.c:3233\n do_mount fs/namespace.c:3246 [inline]\n __do_sys_mount fs/namespace.c:3454 [inline]\n __se_sys_mount+0x2f9/0x3b0 fs/namespace.c:3431\n do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46\n entry_SYSCALL_64_after_hwframe+0x44/0xae\nRIP: 0033:0x4665f9\nCode: ff ff c3 66 2e 0f 1f 84 \n---truncated---",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"
  } ],
  "affected" : [ ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2021-47126"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/09870235827451409ff546b073d754a19fd17e2e"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/0a462e25ef0f7ab305081a08d435bbd1f13c0a94"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/7ba7fa78a92dc410b6f93ed73075ab669c3a0b59"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/821bbf79fe46a8b1d18aa456e8ed0a3c208c3754"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-125" ],
    "severity" : "MODERATE",
    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2024-03-15T21:15:07Z"
  }
}