{
  "cveId": "CVE-2026-98801",
  "url": "https://patchblox.com/security/cve/CVE-2026-98801",
  "summary": "CVE-2026-98801 is fixed in 39 products on 1 platform, first by DEBIAN-CVE-2026-98801, released October 19, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "net: restrict SO_RESERVE_MEM to TCP sockets and cap max value",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  net: restrict SO_RESERVE_MEM to TCP sockets and cap max value  Commit 2bb2f5fb21b0 (\u0022net: add new socket option SO_RESERVE_MEM\u0022) and commit d00c8ee31729 (\u0022net: fix possible NULL deref in sock_reserve_memory\u0022) only checked sk_has_account(sk), which is true for both TCP and UDP sockets.  However, SO_RESERVE_MEM and sk_unused_reserved_mem() are currently only supported by TCP: - On UDP sockets, sk-\u003Esk_forward_alloc is protected by   sk-\u003Esk_receive_queue.lock, whereas sock_reserve_memory() and   sock_release_reserved_memory() only acquire lock_sock(sk). Concurrent   UDP packet reception/release and setsockopt(SO_RESERVE_MEM) corrupt   sk_forward_alloc and memcg accounting. - udp_rmem_release() reclaims excess sk_forward_alloc without   accounting for sk_unused_reserved_mem(sk).  Restrict sock_reserve_memory() to TCP sockets (sk_is_tcp(sk)) for now. Supporting SO_RESERVE_MEM for UDP (acquiring sk_receive_queue.lock and honoring sk_unused_reserved_mem() in udp_rmem_release()) can be done in a future net-next series if needed.  In addition, reject val \u003E SZ_1G with -EINVAL in sk_setsockopt(SO_RESERVE_MEM). Without an upper bound, values near INT_MAX cause sk_mem_pages(delta) and (pages \u003C\u003C PAGE_SHIFT) to overflow 32-bit signed int, corrupting sk-\u003Esk_forward_alloc and sk-\u003Esk_reserved_mem. Using a page-aligned cap (SZ_1G) ensures that the page-rounded sk-\u003Esk_reserved_mem reported by getsockopt(SO_RESERVE_MEM) can always be passed back to setsockopt(SO_RESERVE_MEM).",
  "published": "2026-10-18T16:17:34Z",
  "severity": "Important",
  "cvss": 7.1,
  "epss": 0.00168,
  "epssPercentile": 0.06065,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-98801",
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  "noFixYet": [],
  "dataAsOf": "2026-11-09T07:25:28Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}