9.8

CVE-2026-74268: linux

CVSS: 9.8v3.1CriticalReceived
AliasesUBUNTU-CVE-2026-74268DEBIAN-CVE-2026-74268
Published 15-08-2026Last modified 16-10-2026
Open JSON

Vulnerability summary

CVE-2026-74268 is a critical (CVSS 9.8) vulnerability in linux. EPSS estimates a 0.71% chance of exploitation in the next 30 days, higher than 52.8% of scored vulnerabilities.

Overall risk
70/100
0100
High · default modelHow is this calculated?
CVSS score
9.8/10
010
Critical · v3.1 (CVE.org)
EPSS score
0.71%
0%100%
Low · +0.02 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 11 · Related 11
OPENSUSE-SU-2026:22091-1SUSE-SU-2026:4640-1SUSE-SU-2026:4687-1SUSE-SU-2026:4706-1USN-8781-1USN-8816-1

Timeline

  1. 15-08-2026
    PublishedVulnerability first disclosed.
  2. 16-10-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: tcp: clear sock_ops cb flags before force-closing a child socket A child socket inherits the listener's bpf_sock_ops_cb_flags via sk_clone_lock(). If its setup fails in tcp_v4_syn_recv_sock() / tcp_v6_syn_recv_sock(), the child is freed through put_and_exit, where inet_csk_prepare_forced_close() drops the socket lock and tcp_done() runs without it. If BPF_SOCK_OPS_STATE_CB_FLAG was inherited, tcp_done() -> tcp_set_state() calls tcp_call_bpf(), which expects the lock and trips sock_owned_by_me(): WARNING: include/net/sock.h:1799 at tcp_set_state+0x433/0x550 RIP: 0010:tcp_set_state+0x433/0x550 include/net/sock.h:1799 Call Trace: <IRQ> tcp_done+0xba/0x250 net/ipv4/tcp.c:5095 tcp_v4_syn_recv_sock+0x850/0xa50 net/ipv4/tcp_ipv4.c:1787 tcp_check_req+0xf30/0x1360 net/ipv4/tcp_minisocks.c:926 tcp_v4_rcv+0x1047/0x1b50 net/ipv4/tcp_ipv4.c:2164 </IRQ> The child is freed before it is ever established, so it should run no sock_ops callback. Clear its cb flags in inet_csk_prepare_for_destroy_sock(), the common point for the IPv4, IPv6 and chtls forced-close paths and for the MPTCP ->syn_recv_sock() failure path (dispose_child), which reaches tcp_done() on a child that was never established too.

CVSS metrics

5 scores · 4 sources · 2 versions

EPSS trend

Probability

0.71%

Chance of exploitation in the next 30 days

Percentile

53%

Versus all other CVEs

30-day change

+0.02 pp

From 0.69% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.71%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

No weakness data has been published for this record.

Affected systems

Ubuntu165 products
  • linuxAll versions (No fix recorded) | < 7.0.0-34.34
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 7.0.0-1013.13
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Debian2 products
  • linuxAll versions (No fix recorded) | < 6.1.190-1 | < 6.12.111-1 | < 7.1.5-1
  • linux-6.12< 6.12.111-1~deb12u1
Linux1 product
  • linux≥ d44874910a26f3a8f81edf873a2473363f07f660, < 5d5389b2c37ca00da61d1407618ebe15abae0c8b | ≥ d44874910a26f3a8f81edf873a2473363f07f660, < 9f30ba9aa0270a18fdd1e6cd426c480c35f7de9d | ≥ d44874910a26f3a8f81edf873a2473363f07f660, < 71e9c53220abd7f5a45aa4d5e5b420d3479f3a4f | ≥ d44874910a26f3a8f81edf873a2473363f07f660, < 9fffa6465851a1910a6e9cb7272787dd615b26b1 | ≥ d44874910a26f3a8f81edf873a2473363f07f660, < fe23d56e9266d58ba5c380f1970118eedeee0b68 | ≥ d44874910a26f3a8f81edf873a2473363f07f660, < ce311bd2e36596f0aa2c92ca86fb3e019ac57eae | ≥ d44874910a26f3a8f81edf873a2473363f07f660, < 8874dafc9099bc49c2e5ebba030f85d276421f92 | ≥ d44874910a26f3a8f81edf873a2473363f07f660, < 990348e5bb457697c2f1f7f7b65154a3334d9d2b | 4.16

3 vendors · 168 products

References

20 links
Show all 20 references