CVE-2024-40958

HIGHNVD 7.87.8—
EchelonGraph scoreMEDIUM confidence

Score 7.8 from GitHub Security Advisory (severity: HIGH) published 2024-07-12. NVD baseline CVSS 7.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
7.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 7.8Exploit: NoneExposed: 0

A fix is available — apply it.

In the Linux kernel, the following vulnerability has been resolved:

netns: Make get_net_ns() handle zero refcount net

Syzkaller hit a warning: refcount_t: addition on 0; use-after-free. WARNING: CPU: 3 PID: 7890 at lib/refcount.c:25 refcount_warn_saturate+0xdf/0x1d0 Modules linked in: CPU: 3 PID: 7890 Comm: tun Not tainted 6.10.0-rc3-00100-gcaa4f9578aba-dirty #310 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014 RIP: 0010:refcount_warn_saturate+0xdf/0x1d0 Code: 41 49 04 31 ff 89 de e8 9f 1e cd fe 84 db 75 9c e8 76 26 cd fe c6 05 b6 41 49 04 01 90 48 c7 c7 b8 8e 25 86 e8 d2 05 b5 fe 90 <0f> 0b 90 90 e9 79 ff ff ff e8 53 26 cd fe 0f b6 1 RSP: 0018:ffff8881067b7da0 EFLAGS: 00010286 RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff811c72ac RDX: ffff8881026a2140 RSI: ffffffff811c72b5 RDI: 0000000000000001 RBP: ffff8881067b7db0 R08: 0000000000000000 R09: 205b5d3730353139 R10: 0000000000000000 R11: 205d303938375420 R12: ffff8881086500c4 R13: ffff8881086500c4 R14: ffff8881086500b0 R15: ffff888108650040 FS: 00007f5b2961a4c0(0000) GS:ffff88823bd00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055d7ed36fd18 CR3: 00000001482f6000 CR4: 00000000000006f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: ? show_regs+0xa3/0xc0 ? __warn+0xa5/0x1c0 ? refcount_warn_saturate+0xdf/0x1d0 ? report_bug+0x1fc/0x2d0 ? refcount_warn_saturate+0xdf/0x1d0 ? handle_bug+0xa1/0x110 ? exc_invalid_op+0x3c/0xb0 ? asm_exc_invalid_op+0x1f/0x30 ? __warn_printk+0xcc/0x140 ? __warn_printk+0xd5/0x140 ? refcount_warn_saturate+0xdf/0x1d0 get_net_ns+0xa4/0xc0 ? __pfx_get_net_ns+0x10/0x10 open_related_ns+0x5a/0x130 __tun_chr_ioctl+0x1616/0x2370 ? __sanitizer_cov_trace_switch+0x58/0xa0 ? __sanitizer_cov_trace_const_cmp2+0x1c/0x30 ? __pfx_tun_chr_ioctl+0x10/0x10 tun_chr_ioctl+0x2f/0x40 __x64_sys_ioctl+0x11b/0x160 x64_sys_call+0x1211/0x20d0 do_syscall_64+0x9e/0x1d0 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f5b28f165d7 Code: b3 66 90 48 8b 05 b1 48 2d 00 64 c7 00 26 00 00 00 48 c7 c0 ff ff ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 b8 10 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 81 48 2d 00 8 RSP: 002b:00007ffc2b59c5e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f5b28f165d7 RDX: 0000000000000000 RSI: 00000000000054e3 RDI: 0000000000000003 RBP: 00007ffc2b59c650 R08: 00007f5b291ed8c0 R09: 00007f5b2961a4c0 R10: 0000000029690010 R11: 0000000000000246 R12: 0000000000400730 R13: 00007ffc2b59cf40 R14: 0000000000000000 R15: 0000000000000000 Kernel panic - not syncing: kernel: panic_on_warn set ...

This is trigger as below: ns0 ns1 tun_set_iff() //dev is tun0 tun->dev = dev //ip link set tun0 netns ns1 put_net() //ref is 0 __tun_chr_ioctl() //TUNGETDEVNETNS net = dev_net(tun->dev); open_related_ns(&net->ns, get_net_ns); //ns1 get_net_ns() get_net() //addition on 0

Use maybe_get_net() in get_net_ns in case net's ref is zero to fix this

CVSS v3
7.8
EG Score
7.8(medium)
EG Risk
35(Track)
EG Risk 35/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity78% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS
18.6%
KEV
Not listed

Published

July 12, 2024

Last Modified

May 12, 2026

References (18)

Vendor Advisories for CVE-2024-40958(3)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(23)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulinux-tools-azure (6.8.0-1014.16) @ noble2026-05-22ubuntu
ubuntulinux-tools-nvidia-lowlatency-64k (6.8.0-1013.14.1) @ noble2026-05-22ubuntu
ubuntulinux-tools-iot (5.4.0.1043.41) @ focal2026-05-22ubuntu
ubuntulinux-xilinx-zynqmp-tools-5.4.0-1051 (5.4.0-1051.55) @ focal2026-05-22ubuntu
ubuntulinux-virtual-hwe-20.04-edge (5.15.0.121.121) @ jammy2026-05-22ubuntu
ubuntulinux-tools-lowlatency-hwe-22.04-edge (6.8.0-44.44.1~22.04.1) @ jammy2026-05-22ubuntu
ubuntulinux-virtual-hwe-22.04-edge (6.8.0-45.45~22.04.1) @ jammy2026-05-22ubuntu
ubuntulinux-tools-nvidia-hwe-22.04-edge (6.8.0-1013.14~22.04.1) @ jammy2026-05-22ubuntu
ubuntulinux-virtual-hwe-24.04-edge (6.8.0-44.44) @ noble2026-05-22ubuntu
ubuntulinux-tools-azure-lts-22.04 (5.15.0.1072.70) @ jammy2026-05-22ubuntu
ubuntulinux-tools-lowlatency-hwe-20.04-edge (5.15.0.121.131~20.04.1) @ focal2026-05-22ubuntu
ubuntulinux-tools-raspi (6.8.0-1011.12) @ noble2026-05-22ubuntu
ubuntulinux-tools-oracle-edge (5.15.0.1067.73~20.04.1) @ focal2026-05-22ubuntu
ubuntulinux-tools-raspi2-hwe-18.04-edge (5.4.0.1116.146) @ focal2026-05-22ubuntu
ubuntulinux-tools-azure-fde-edge (5.15.0.1072.81~20.04.1.49) @ focal2026-05-22ubuntu
ubuntulinux-tools-raspi-hwe-18.04-edge (5.4.0.1116.128~18.04.1) @ bionic2026-05-22ubuntu
ubuntulinux-xilinx-zynqmp-tools-host (5.15.0-1035.39) @ jammy2026-05-22ubuntu
ubuntulinux-virtual-hwe-18.04-edge (5.4.0.195.193) @ focal2026-05-22ubuntu
ubuntulinux-virtual-hwe-18.04-edge (5.4.0.195.215~18.04.1) @ bionic2026-05-22ubuntu
redhatkernel-rt-0:4.18.0-553.22.1.rt7.363.el8_102024-09-24redhat
redhatkernel-0:4.18.0-553.22.1.el8_102024-09-24redhat
redhatkernel-0:5.14.0-427.31.1.el9_42024-08-15redhat
linuxKernel @ 5.4.279—osv

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Additional Vendor Advisories

(19)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 10× in last 7d / 43× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 109 total refreshes for this CVE.

  1. 2026-07-23 02:39 UTCEG score recompute
  2. 2026-07-22 14:07 UTCEPSS rescore
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  70. 2026-05-22 00:22 UTCVendor advisory
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Related CVEs(same product + same vendor + same CWE)

Frequently asked(5)

What is CVE-2024-40958?
CVE-2024-40958 is a high vulnerability published on July 12, 2024. In the Linux kernel, the following vulnerability has been resolved: netns: Make getnetns() handle zero refcount net Syzkaller hit a warning: refcount_t: addition on 0; use-after-free. WARNING: CPU: 3 PID: 7890 at lib/refcount.c:25 refcountwarnsaturate+0xdf/0x1d0 Modules linked in: CPU: 3 PID: 7890…
When was CVE-2024-40958 disclosed?
CVE-2024-40958 was first published in the National Vulnerability Database on July 12, 2024, with the most recent update on May 12, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2024-40958 actively exploited?
CVE-2024-40958 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 18.6% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2024-40958?
CVE-2024-40958 has a CVSS v3 base score of 7.8 (NVD).
How do I remediate CVE-2024-40958?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2024-40958, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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