{
  "cveId": "CVE-2026-43244",
  "url": "https://patchblox.com/security/cve/CVE-2026-43244",
  "summary": "CVE-2026-43244 is fixed in 60 products on 1 platform, first by ALAS2023-2026-1543, released April 7, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "kcm: fix zero-frag skb in frag_list on partial sendmsg error",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  kcm: fix zero-frag skb in frag_list on partial sendmsg error  Syzkaller reported a warning in kcm_write_msgs() when processing a message with a zero-fragment skb in the frag_list.  When kcm_sendmsg() fills MAX_SKB_FRAGS fragments in the current skb, it allocates a new skb (tskb) and links it into the frag_list before copying data. If the copy subsequently fails (e.g. -EFAULT from user memory), tskb remains in the frag_list with zero fragments:    head skb (msg being assembled, NOT yet in sk_write_queue)   \u002B-----------\u002B   | frags[17] |  (MAX_SKB_FRAGS, all filled with data)   | frag_list-\u002B--\u003E tskb   \u002B-----------\u002B    \u002B----------\u002B                    | frags[0] |  (empty! copy failed before filling)                    \u002B----------\u002B  For SOCK_SEQPACKET with partial data already copied, the error path saves this message via partial_message for later completion. For SOCK_SEQPACKET, sock_write_iter() automatically sets MSG_EOR, so a subsequent zero-length write(fd, NULL, 0) completes the message and queues it to sk_write_queue. kcm_write_msgs() then walks the frag_list and hits:    WARN_ON(!skb_shinfo(skb)-\u003Enr_frags)  TCP has a similar pattern where skbs are enqueued before data copy and cleaned up on failure via tcp_remove_empty_skb(). KCM was missing the equivalent cleanup.  Fix this by tracking the predecessor skb (frag_prev) when allocating a new frag_list entry. On error, if the tail skb has zero frags, use frag_prev to unlink and free it in O(1) without walking the singly-linked frag_list. frag_prev is safe to dereference because the entire message chain is only held locally (or in kcm-\u003Eseq_skb) and is not added to sk_write_queue until MSG_EOR, so the send path cannot free it underneath us.  Also change the WARN_ON to WARN_ON_ONCE to avoid flooding the log if the condition is somehow hit repeatedly.  There are currently no KCM selftests in the kernel tree; a simple reproducer is available at [1].  [1] https://gist.github.com/mrpre/a94d431c757e8d6f168f4dd1a3749daa",
  "published": "2026-04-07T09:00:00Z",
  "severity": "Moderate",
  "cvss": 5.5,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
  "cwe": "Missing Release of Memory after Effective Lifetime",
  "epss": 0.00156,
  "epssPercentile": 0.0472,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-43244",
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