Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1336 CNY

100%
Buy Us a Coffee

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

AI Predicted 4.4 Difficulty: Moderate EPSS 0.12% · P2

Possible ATT&CK Techniques 1AI

T1496 · Resource Hijacking

Affected Version Matrix 18

VendorProductVersion RangeStatus
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< ad8e8fec40290a8c8cf145c0deaadf76f80c5163affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< ab1ff5890c7354afc7be56502fcfbd61f3b7ae4faffected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 25b6821884713a31e2b49fb67b0ebd765b33e0a9affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< c56f78614e7781aaceca9bd3cb2128bf7d45c3bdaffected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< b9e6431cbea8bb1fae8069ed099b4ee100499835affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 17c1b9807b8a67d676b6dcf749ee932ebaa7f568affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< d0aefec1b1a1ba2c1d251028dc2c4e5b4ce1fea5affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 4576100b8cd03118267513cafacde164b498b322affected
… +10 more rows
Get alerts for future matching vulnerabilitiesLog in to subscribe

I. Basic Information for CVE-2026-31423

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

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

VendorProductAffected VersionsCPESubscribe
LinuxLinux 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 ~ ad8e8fec40290a8c8cf145c0deaadf76f80c5163 -
LinuxLinux 2.6.12 -

II. Public POCs for CVE-2026-31423

#POC DescriptionSource LinkShenlong Link
AI-Generated POCPremium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2026-31423

请登录查看更多情报信息。

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

CVE-2026-314149.8 CRITICALnetfilter: nf_conntrack_expect: use expect->helper
CVE-2026-314197.8 HIGHnet: bonding: fix use-after-free in bond_xmit_broadcast()
CVE-2026-314177.5 HIGHnet/x25: Fix overflow when accumulating packets
CVE-2026-314267.0 HIGHACPI: EC: clean up handlers on probe failure in acpi_ec_setup()
CVE-2026-31428netfilter: nfnetlink_log: fix uninitialized padding leak in NFULA_PAYLOAD
CVE-2026-31427netfilter: nf_conntrack_sip: fix use of uninitialized rtp_addr in process_sdp
CVE-2026-31425rds: ib: reject FRMR registration before IB connection is established
CVE-2026-31424netfilter: x_tables: restrict xt_check_match/xt_check_target extensions for NFPROTO_ARP
CVE-2026-31422net/sched: cls_flow: fix NULL pointer dereference on shared blocks
CVE-2026-31420bridge: mrp: reject zero test interval to avoid OOM panic
CVE-2026-31421net/sched: cls_fw: fix NULL pointer dereference on shared blocks
CVE-2026-31418netfilter: ipset: drop logically empty buckets in mtype_del
CVE-2026-31416netfilter: nfnetlink_log: account for netlink header size
CVE-2026-31415ipv6: avoid overflows in ip6_datagram_send_ctl()

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-31423

No comments yet

Leave a comment