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CVE-2026-31423— net/sched: sch_hfsc: fix divide-by-zero in rtsc_min()

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sch_hfsc模块的rtsc_min函数存在除零错误，可能导致内核崩溃。

AI Predicted 4.4 Difficulty: Moderate EPSS 0.17% · P6

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< ad8e8fec40290a8c8cf145c0deaadf76f80c5163 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< ab1ff5890c7354afc7be56502fcfbd61f3b7ae4f affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 25b6821884713a31e2b49fb67b0ebd765b33e0a9 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< c56f78614e7781aaceca9bd3cb2128bf7d45c3bd affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< b9e6431cbea8bb1fae8069ed099b4ee100499835 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 17c1b9807b8a67d676b6dcf749ee932ebaa7f568 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< d0aefec1b1a1ba2c1d251028dc2c4e5b4ce1fea5 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 4576100b8cd03118267513cafacde164b498b322 affected
… +10 more rows
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I. Basic Information for CVE-2026-31423

Vulnerability Information
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Vulnerability Title
net/sched: sch_hfsc: fix divide-by-zero in rtsc_min()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: net/sched: sch_hfsc: fix divide-by-zero in rtsc_min() m2sm() converts a u32 slope to a u64 scaled value. For large inputs (e.g. m1=4000000000), the result can reach 2^32. rtsc_min() stores the difference of two such u64 values in a u32 variable `dsm` and uses it as a divisor. When the difference is exactly 2^32 the truncation yields zero, causing a divide-by-zero oops in the concave-curve intersection path: Oops: divide error: 0000 RIP: 0010:rtsc_min (net/sched/sch_hfsc.c:601) Call Trace: init_ed (net/sched/sch_hfsc.c:629) hfsc_enqueue (net/sched/sch_hfsc.c:1569) [...] Widen `dsm` to u64 and replace do_div() with div64_u64() so the full difference is preserved.
Source: CVE Program / CVE List V5
CVSS Information
N/A
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sch_hfsc模块的rtsc_min函数存在除零错误，可能导致内核崩溃。
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 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 ~ ad8e8fec40290a8c8cf145c0deaadf76f80c5163 -
Linux Linux 2.6.12 -

II. Public POCs for CVE-2026-31423

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III. Intelligence Information for CVE-2026-31423

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Same Patch Batch · Linux · 2026-04-13 · 15 CVEs total

CVE-2026-31414 9.8 CRITICAL netfilter: nf_conntrack_expect: use expect->helper
CVE-2026-31419 7.8 HIGH net: bonding: fix use-after-free in bond_xmit_broadcast()
CVE-2026-31417 7.5 HIGH net/x25: Fix overflow when accumulating packets
CVE-2026-31426 7.0 HIGH ACPI: EC: clean up handlers on probe failure in acpi_ec_setup()
CVE-2026-31428 netfilter: nfnetlink_log: fix uninitialized padding leak in NFULA_PAYLOAD
CVE-2026-31427 netfilter: nf_conntrack_sip: fix use of uninitialized rtp_addr in process_sdp
CVE-2026-31425 rds: ib: reject FRMR registration before IB connection is established
CVE-2026-31424 netfilter: x_tables: restrict xt_check_match/xt_check_target extensions for NFPROTO_ARP
CVE-2026-31422 net/sched: cls_flow: fix NULL pointer dereference on shared blocks
CVE-2026-31420 bridge: mrp: reject zero test interval to avoid OOM panic
CVE-2026-31421 net/sched: cls_fw: fix NULL pointer dereference on shared blocks
CVE-2026-31418 netfilter: ipset: drop logically empty buckets in mtype_del
CVE-2026-31416 netfilter: nfnetlink_log: account for netlink header size
CVE-2026-31415 ipv6: avoid overflows in ip6_datagram_send_ctl()

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-31423

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