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CVE-2024-53125— bpf: sync_linked_regs() must preserve subreg_def

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于bpf子系统中sync_linked_regs函数未能保留subreg_def标记，可能导致BPF_F_TEST_RND_HI32标志下的错误重写。

CVSS 7.8 · High EPSS 0.23% · P13

Affected Version Matrix 14

VendorProduct Version RangeStatus
Linux Linux 75748837b7e56919679e02163f45d5818c644d03< dadf82c1b2608727bcc306843b540cd7414055a7 affected
75748837b7e56919679e02163f45d5818c644d03< b57ac2d92c1f565743f6890a5b9cf317ed856b09 affected
75748837b7e56919679e02163f45d5818c644d03< 60fd3538d2a8fd44c41d25088c0ece3e1fd30659 affected
75748837b7e56919679e02163f45d5818c644d03< bfe9446ea1d95f6cb7848da19dfd58d2eec6fd84 affected
75748837b7e56919679e02163f45d5818c644d03< e2ef0f317a52e678fe8fa84b94d6a15b466d6ff0 affected
75748837b7e56919679e02163f45d5818c644d03< e9bd9c498cb0f5843996dbe5cbce7a1836a83c70 affected
5.10 affected
< 5.10 unaffected
… +6 more rows
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I. Basic Information for CVE-2024-53125

Vulnerability Information
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Vulnerability Title
bpf: sync_linked_regs() must preserve subreg_def
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: bpf: sync_linked_regs() must preserve subreg_def Range propagation must not affect subreg_def marks, otherwise the following example is rewritten by verifier incorrectly when BPF_F_TEST_RND_HI32 flag is set: 0: call bpf_ktime_get_ns call bpf_ktime_get_ns 1: r0 &= 0x7fffffff after verifier r0 &= 0x7fffffff 2: w1 = w0 rewrites w1 = w0 3: if w0 < 10 goto +0 --------------> r11 = 0x2f5674a6 (r) 4: r1 >>= 32 r11 <<= 32 (r) 5: r0 = r1 r1 |= r11 (r) 6: exit; if w0 < 0xa goto pc+0 r1 >>= 32 r0 = r1 exit (or zero extension of w1 at (2) is missing for architectures that require zero extension for upper register half). The following happens w/o this patch: - r0 is marked as not a subreg at (0); - w1 is marked as subreg at (2); - w1 subreg_def is overridden at (3) by copy_register_state(); - w1 is read at (5) but mark_insn_zext() does not mark (2) for zero extension, because w1 subreg_def is not set; - because of BPF_F_TEST_RND_HI32 flag verifier inserts random value for hi32 bits of (2) (marked (r)); - this random value is read at (5).
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于bpf子系统中sync_linked_regs函数未能保留subreg_def标记，可能导致BPF_F_TEST_RND_HI32标志下的错误重写。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 75748837b7e56919679e02163f45d5818c644d03 ~ dadf82c1b2608727bcc306843b540cd7414055a7 -
Linux Linux 5.10 -

II. Public POCs for CVE-2024-53125

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III. Intelligence Information for CVE-2024-53125

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Patches & Fixes for CVE-2024-53125 (6)

Same Patch Batch · Linux · 2024-12-04 · 16 CVEs total

CVE-2024-53138 9.8 CRITICAL net/mlx5e: kTLS, Fix incorrect page refcounting
CVE-2024-53135 8.8 HIGH KVM: VMX: Bury Intel PT virtualization (guest/host mode) behind CONFIG_BROKEN
CVE-2024-53127 7.8 HIGH Revert "mmc: dw_mmc: Fix IDMAC operation with pages bigger than 4K"
CVE-2024-53133 7.8 HIGH drm/amd/display: Handle dml allocation failure to avoid crash
CVE-2024-53139 7.8 HIGH sctp: fix possible UAF in sctp_v6_available()
CVE-2024-53140 7.8 HIGH netlink: terminate outstanding dump on socket close
CVE-2024-53136 7.5 HIGH mm: revert "mm: shmem: fix data-race in shmem_getattr()"
CVE-2024-53126 7.1 HIGH vdpa: solidrun: Fix UB bug with devres
CVE-2024-53128 sched/task_stack: fix object_is_on_stack() for KASAN tagged pointers
CVE-2024-53129 drm/rockchip: vop: Fix a dereferenced before check warning
CVE-2024-53130 nilfs2: fix null-ptr-deref in block_dirty_buffer tracepoint
CVE-2024-53131 nilfs2: fix null-ptr-deref in block_touch_buffer tracepoint
CVE-2024-53132 drm/xe/oa: Fix "Missing outer runtime PM protection" warning
CVE-2024-53134 pmdomain: imx93-blk-ctrl: correct remove path
CVE-2024-53137 ARM: fix cacheflush with PAN

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2024-53125

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