{"id":"CVE-2026-31515","title":"af_key: validate families in pfkey_send_migrate()","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\naf_key: validate families in pfkey_send_migrate()\n\nsyzbot was able to trigger a crash in skb_put() [1]\n\nIssue is that pfkey_send_migrate() does not check old/new famili…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= 08de61beab8a21c8e0b3906a97defda5f1f66ece < d0c5aa8dd38887714f1aad04236a3620b56a5e4e","Linux >= 08de61beab8a21c8e0b3906a97defda5f1f66ece < e06b596fc4eb01936a2e5dccad17c946d660bab8","Linux >= 08de61beab8a21c8e0b3906a97defda5f1f66ece < 8ddf8de7e758f6888988467af9ffc8adf589fb16","Linux >= 08de61beab8a21c8e0b3906a97defda5f1f66ece < d3225e6b9bd51ec177970a628fe4b11237ce87d5","Linux >= 08de61beab8a21c8e0b3906a97defda5f1f66ece < 7b18692c59afb8e5c364c8e3ac01e51dd6b52028","Linux >= 08de61beab8a21c8e0b3906a97defda5f1f66ece < 83f644ea92987c100b82d8481ae2230faeed3d34","Linux >= 08de61beab8a21c8e0b3906a97defda5f1f66ece < ee836e820a40e2ca4da8af7310bff92d586772d4","Linux >= 08de61beab8a21c8e0b3906a97defda5f1f66ece < eb2d16a7d599dc9d4df391b5e660df9949963786","Linux 2.6.21"],"published":"2026-04-22","updated":"2026-09-08","sourceUpdated":"2026-09-08T08:47:35.688Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-31515","references":[{"url":"https://git.kernel.org/stable/c/d0c5aa8dd38887714f1aad04236a3620b56a5e4e"},{"url":"https://git.kernel.org/stable/c/e06b596fc4eb01936a2e5dccad17c946d660bab8"},{"url":"https://git.kernel.org/stable/c/8ddf8de7e758f6888988467af9ffc8adf589fb16"},{"url":"https://git.kernel.org/stable/c/d3225e6b9bd51ec177970a628fe4b11237ce87d5"},{"url":"https://git.kernel.org/stable/c/7b18692c59afb8e5c364c8e3ac01e51dd6b52028"},{"url":"https://git.kernel.org/stable/c/83f644ea92987c100b82d8481ae2230faeed3d34"},{"url":"https://git.kernel.org/stable/c/ee836e820a40e2ca4da8af7310bff92d586772d4"},{"url":"https://git.kernel.org/stable/c/eb2d16a7d599dc9d4df391b5e660df9949963786"}],"tags":["cve.org"],"epss":0.00171,"epssPercentile":0.05675,"ingestedAt":"2026-09-08T15:33:26.990Z","slug":"CVE-2026-31515","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\naf_key: validate families in pfkey_send_migrate()\n\nsyzbot was able to trigger a crash in skb_put() [1]\n\nIssue is that pfkey_send_migrate() does not check old/new families,\nand that set_ipsecrequest() @family argument was truncated,\nthus possibly overfilling the skb.\n\nValidate families early, do not wait set_ipsecrequest().\n\n[1]\n\nskbuff: skb_over_panic: text:ffffffff8a752120 len:392 put:16 head:ffff88802a4ad040 data:ffff88802a4ad040 tail:0x188 end:0x180 dev:<NULL>\n kernel BUG at net/core/skbuff.c:214 !\nCall Trace:\n <TASK>\n  skb_over_panic net/core/skbuff.c:219 [inline]\n  skb_put+0x159/0x210 net/core/skbuff.c:2655\n  skb_put_zero include/linux/skbuff.h:2788 [inline]\n  set_ipsecrequest net/key/af_key.c:3532 [inline]\n  pfkey_send_migrate+0x1270/0x2e50 net/key/af_key.c:3636\n  km_migrate+0x155/0x260 net/xfrm/xfrm_state.c:2848\n  xfrm_migrate+0x2140/0x2450 net/xfrm/xfrm_policy.c:4705\n  xfrm_do_migrate+0x8ff/0xaa0 net/xfrm/xfrm_user.c:3150\n\n## Affected\n\n- `Linux >= 08de61beab8a21c8e0b3906a97defda5f1f66ece < d0c5aa8dd38887714f1aad04236a3620b56a5e4e`\n- `Linux >= 08de61beab8a21c8e0b3906a97defda5f1f66ece < e06b596fc4eb01936a2e5dccad17c946d660bab8`\n- `Linux >= 08de61beab8a21c8e0b3906a97defda5f1f66ece < 8ddf8de7e758f6888988467af9ffc8adf589fb16`\n- `Linux >= 08de61beab8a21c8e0b3906a97defda5f1f66ece < d3225e6b9bd51ec177970a628fe4b11237ce87d5`\n- `Linux >= 08de61beab8a21c8e0b3906a97defda5f1f66ece < 7b18692c59afb8e5c364c8e3ac01e51dd6b52028`\n- `Linux >= 08de61beab8a21c8e0b3906a97defda5f1f66ece < 83f644ea92987c100b82d8481ae2230faeed3d34`\n- `Linux >= 08de61beab8a21c8e0b3906a97defda5f1f66ece < ee836e820a40e2ca4da8af7310bff92d586772d4`\n- `Linux >= 08de61beab8a21c8e0b3906a97defda5f1f66ece < eb2d16a7d599dc9d4df391b5e660df9949963786`\n- `Linux 2.6.21`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}