CVE-2025-21868

MEDIUMNVD 5.55.5—
EchelonGraph scoreMEDIUM confidence

Score 5.5 from GitHub Security Advisory published 2025-03-27. NVD baseline CVSS 5.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 4 sources updated this week
5.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.5Exploit: None knownExposed: 0

A fix is available — apply it.

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

net: allow small head cache usage with large MAX_SKB_FRAGS values

Sabrina reported the following splat:

WARNING: CPU: 0 PID: 1 at net/core/dev.c:6935 netif_napi_add_weight_locked+0x8f2/0xba0 Modules linked in: CPU: 0 UID: 0 PID: 1 Comm: swapper/0 Not tainted 6.14.0-rc1-net-00092-g011b03359038 #996 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Arch Linux 1.16.3-1-1 04/01/2014 RIP: 0010:netif_napi_add_weight_locked+0x8f2/0xba0 Code: e8 c3 e6 6a fe 48 83 c4 28 5b 5d 41 5c 41 5d 41 5e 41 5f c3 cc cc cc cc c7 44 24 10 ff ff ff ff e9 8f fb ff ff e8 9e e6 6a fe <0f> 0b e9 d3 fe ff ff e8 92 e6 6a fe 48 8b 04 24 be ff ff ff ff 48 RSP: 0000:ffffc9000001fc60 EFLAGS: 00010293 RAX: 0000000000000000 RBX: ffff88806ce48128 RCX: 1ffff11001664b9e RDX: ffff888008f00040 RSI: ffffffff8317ca42 RDI: ffff88800b325cb6 RBP: ffff88800b325c40 R08: 0000000000000001 R09: ffffed100167502c R10: ffff88800b3a8163 R11: 0000000000000000 R12: ffff88800ac1c168 R13: ffff88800ac1c168 R14: ffff88800ac1c168 R15: 0000000000000007 FS: 0000000000000000(0000) GS:ffff88806ce00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffff888008201000 CR3: 0000000004c94001 CR4: 0000000000370ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: gro_cells_init+0x1ba/0x270 xfrm_input_init+0x4b/0x2a0 xfrm_init+0x38/0x50 ip_rt_init+0x2d7/0x350 ip_init+0xf/0x20 inet_init+0x406/0x590 do_one_initcall+0x9d/0x2e0 do_initcalls+0x23b/0x280 kernel_init_freeable+0x445/0x490 kernel_init+0x20/0x1d0 ret_from_fork+0x46/0x80 ret_from_fork_asm+0x1a/0x30 irq event stamp: 584330 hardirqs last enabled at (584338): [] __up_console_sem+0x77/0xb0 hardirqs last disabled at (584345): [] __up_console_sem+0x5c/0xb0 softirqs last enabled at (583242): [] netlink_insert+0x14d/0x470 softirqs last disabled at (583754): [] netif_napi_add_weight_locked+0x77d/0xba0

on kernel built with MAX_SKB_FRAGS=45, where SKB_WITH_OVERHEAD(1024) is smaller than GRO_MAX_HEAD.

Such built additionally contains the revert of the single page frag cache so that napi_get_frags() ends up using the page frag allocator, triggering the splat.

Note that the underlying issue is independent from the mentioned revert; address it ensuring that the small head cache will fit either TCP and GRO allocation and updating napi_alloc_skb() and __netdev_alloc_skb() to select kmalloc() usage for any allocation fitting such cache.

CVSS v3
5.5
EG Score
5.5(medium)
EG Risk
29(Track)
EG Risk 29/100SSVC: 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
Severity55% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
28%
KEV
Not listed

Published

March 27, 2025

Last Modified

August 5, 2026

Advisory Details (4)

Auto-updated Aug 2, 2026
No patch confirmed yet.
generic

net: allow small head cache usage with large MAX_SKB_FRAGS values - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/ed8a77fee4618facd2a539cad7b7366697b5a575
generic

net: allow small head cache usage with large MAX_SKB_FRAGS values - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/ed0ca7d2127c63991cfaf1932b827e3f4f8ee480
generic

net: allow small head cache usage with large MAX_SKB_FRAGS values - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/648e440c98e260dec835e48a5d7a9993477b1f9d
generic

net: allow small head cache usage with large MAX_SKB_FRAGS values - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/14ad6ed30a10afbe91b0749d6378285f4225d482

Vendor Advisories for CVE-2025-21868(1)

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

Patch Availability(10)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulinux-virtual-hwe-24.04-edge (6.11.0-26.26~24.04.1) @ noble2026-05-30ubuntu
ubuntulinux-tools-ibm-lts-24.04 (6.8.0-1033.33) @ noble2026-05-30ubuntu
ubuntulinux-tools-aws (6.11.0-1014.15) @ oracular2026-05-30ubuntu
ubuntulinux-tools-oracle-64k (6.11.0-1016.17) @ oracular2026-05-30ubuntu
ubuntulinux-virtual-6.8 (6.8.0-78.78) @ noble2026-05-30ubuntu
ubuntulinux-tools-oracle-lts-24.04 (6.8.0-1032.33) @ noble2026-05-30ubuntu
ubuntulinux-tools-raspi-realtime-6.8 (6.8.0-2028.29) @ noble2026-05-30ubuntu
ubuntulinux-virtual-hwe-22.04-edge (6.8.0-78.78~22.04.1) @ jammy2026-05-30ubuntu
ubuntulinux-tools-azure-nvidia-lts-24.04 (6.8.0-1022.23) @ noble2026-05-30ubuntu
linuxKernel @ 6.6.117—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.

Additional Vendor Advisories

(9)

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 / 46× 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 114 total refreshes for this CVE.

  1. 2026-08-07 16:26 UTCEPSS rescore
  2. 2026-08-06 13:46 UTCEPSS rescore
  3. 2026-08-05 19:16 UTCEPSS rescore
  4. 2026-08-05 14:01 UTCEG score recompute
  5. 2026-08-05 14:01 UTCVendor advisory
  6. 2026-08-05 14:01 UTCGHSA enrichment
  7. 2026-08-04 15:09 UTCEPSS rescore
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  13. 2026-07-30 07:19 UTCEG score recompute
  14. 2026-07-30 07:19 UTCVendor advisory
  15. 2026-07-30 07:19 UTCGHSA enrichment
  16. 2026-07-30 01:29 UTCEPSS rescore
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  22. 2026-07-24 10:41 UTCOSV refresh
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  24. 2026-07-23 02:50 UTCEG score recompute
  25. 2026-07-22 14:07 UTCEPSS rescore
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  22. 2026-07-08 15:14 UTCEPSS rescore
  23. 2026-07-07 13:45 UTCEPSS rescore
  24. 2026-07-07 06:21 UTCOSV refresh
  25. 2026-07-06 16:26 UTCEPSS rescore
  26. 2026-07-05 02:30 UTCEPSS rescore
  27. 2026-07-04 06:30 UTCEPSS rescore
  28. 2026-07-01 15:06 UTCEPSS rescore
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  54. 2026-06-18 17:35 UTCOSV refresh
  55. 2026-06-17 17:52 UTCEPSS rescore
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Frequently asked(5)

What is CVE-2025-21868?
CVE-2025-21868 is a medium vulnerability published on March 27, 2025. In the Linux kernel, the following vulnerability has been resolved: net: allow small head cache usage with large MAXSKBFRAGS values Sabrina reported the following splat: WARNING: CPU: 0 PID: 1 at net/core/dev.c:6935 netifnapiaddweightlocked+0x8f2/0xba0 Modules linked in: CPU: 0 UID: 0 PID: 1 Comm:…
When was CVE-2025-21868 disclosed?
CVE-2025-21868 was first published in the National Vulnerability Database on March 27, 2025, with the most recent update on August 5, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2025-21868 actively exploited?
CVE-2025-21868 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 71.9% of all scored CVEs.
What is the CVSS score of CVE-2025-21868?
CVE-2025-21868 has a CVSS v3 base score of 5.5 (NVD).
How do I remediate CVE-2025-21868?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2025-21868, 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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