{
"schemaVersion": 1,
"attribution": [
{
"source": "CISA Known Exploited Vulnerabilities",
"url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog",
"licence": "US government work"
},
{
"source": "GitHub Advisory Database",
"url": "https://github.com/advisories",
"licence": "CC BY 4.0"
},
{
"source": "Have I Been Pwned",
"url": "https://haveibeenpwned.com/",
"licence": "CC BY 4.0"
},
{
"source": "CVE Program (CVE records)",
"url": "https://www.cve.org/Legal/TermsOfUse",
"licence": "CVE Terms of Use",
"notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.",
"terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy."
},
{
"source": "FIRST EPSS",
"url": "https://www.first.org/epss/",
"licence": "free to use; FIRST requests attribution"
}
],
"record": {
"id": "CVE-2025-21868",
"sourceURL": "https://www.cve.org/CVERecord?id=CVE-2025-21868",
"idYear": 2025,
"status": "PUBLISHED",
"publishedAt": "2025-03-27T13:38:21.586Z",
"updatedAt": "2026-08-05T11:55:00.388Z",
"importedAt": "2026-10-24T01:57:29.455Z",
"snapshot": {
"id": "cve_2026-10-24_midnight_baseline",
"at": "2026-10-24T00:00:00.000Z",
"source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z"
},
"facts": {
"title": "net: allow small head cache usage with large MAX_SKB_FRAGS values",
"summary": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: allow small head cache usage with large MAX_SKB_FRAGS values\n\nSabrina reported the following splat:\n\n WARNING: CPU: 0 PID: 1 at net/core/dev.c:6935 netif_napi_add_weight_locked+0x8f2/0xba0\n Modules linked in:\n CPU: 0 UID: 0 PID: 1 Comm: swapper/0 Not tainted 6.14.0-rc1-net-00092-g011b03359038 #996\n Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Arch Linux 1.16.3-1-1 04/01/2014\n RIP: 0010:netif_napi_add_weight_locked+0x8f2/0xba0\n 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\n RSP: 0000:ffffc9000001fc60 EFLAGS: 00010293\n RAX: 0000000000000000 RBX: ffff88806ce48128 RCX: 1ffff11001664b9e\n RDX: ffff888008f00040 RSI: ffffffff8317ca42 RDI: ffff88800b325cb6\n RBP: ffff88800b325c40 R08: 0000000000000001 R09: ffffed100167502c\n R10: ffff88800b3a8163 R11: 0000000000000000 R12: ffff88800ac1c168\n R13: ffff88800ac1c168 R14: ffff88800ac1c168 R15: 0000000000000007\n FS: 0000000000000000(0000) GS:ffff88806ce00000(0000) knlGS:0000000000000000\n CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n CR2: ffff888008201000 CR3: 0000000004c94001 CR4: 0000000000370ef0\n DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\n DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\n Call Trace:\n \n gro_cells_init+0x1ba/0x270\n xfrm_input_init+0x4b/0x2a0\n xfrm_init+0x38/0x50\n ip_rt_init+0x2d7/0x350\n ip_init+0xf/0x20\n inet_init+0x406/0x590\n do_one_initcall+0x9d/0x2e0\n do_initcalls+0x23b/0x280\n kernel_init_freeable+0x445/0x490\n kernel_init+0x20/0x1d0\n ret_from_fork+0x46/0x80\n ret_from_fork_asm+0x1a/0x30\n \n irq event stamp: 584330\n hardirqs last enabled at (584338): [] __up_console_sem+0x77/0xb0\n hardirqs last disabled at (584345): [] __up_console_sem+0x5c/0xb0\n softirqs last enabled at (583242): [] netlink_insert+0x14d/0x470\n softirqs last disabled at (583754): [] netif_napi_add_weight_locked+0x77d/0xba0\n\non kernel built with MAX_SKB_FRAGS=45, where SKB_WITH_OVERHEAD(1024)\nis smaller than GRO_MAX_HEAD.\n\nSuch built additionally contains the revert of the single page frag cache\nso that napi_get_frags() ends up using the page frag allocator, triggering\nthe splat.\n\nNote that the underlying issue is independent from the mentioned\nrevert; address it ensuring that the small head cache will fit either TCP\nand GRO allocation and updating napi_alloc_skb() and __netdev_alloc_skb()\nto select kmalloc() usage for any allocation fitting such cache.",
"affected": [
{
"vendor": "Linux",
"product": "Linux",
"defaultStatus": "unaffected",
"versions": [
{
"version": "3948b05950fdd64002a5f182c65ba5cf2d53cf71",
"status": "affected",
"versionType": "git",
"lessThan": "ed8a77fee4618facd2a539cad7b7366697b5a575"
},
{
"version": "3948b05950fdd64002a5f182c65ba5cf2d53cf71",
"status": "affected",
"versionType": "git",
"lessThan": "ed0ca7d2127c63991cfaf1932b827e3f4f8ee480"
},
{
"version": "3948b05950fdd64002a5f182c65ba5cf2d53cf71",
"status": "affected",
"versionType": "git",
"lessThan": "648e440c98e260dec835e48a5d7a9993477b1f9d"
},
{
"version": "3948b05950fdd64002a5f182c65ba5cf2d53cf71",
"status": "affected",
"versionType": "git",
"lessThan": "14ad6ed30a10afbe91b0749d6378285f4225d482"
}
]
},
{
"vendor": "Linux",
"product": "Linux",
"defaultStatus": "affected",
"versions": [
{
"version": "6.4",
"status": "affected"
},
{
"version": "0",
"status": "unaffected",
"versionType": "semver",
"lessThan": "6.4"
},
{
"version": "6.6.117",
"status": "unaffected",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"version": "6.12.17",
"status": "unaffected",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"version": "6.13.5",
"status": "unaffected",
"versionType": "semver",
"lessThanOrEqual": "6.13.*"
},
{
"version": "6.14",
"status": "unaffected",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
]
}
]
}
}
}