The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - net: skbuff: propagate shared-frag marker through frag-transfer helpers Two frag-transfer helpers     (__pskb_copy_fclone() and skb_shift()) fail to propagate the SKBFL_SHARED_FRAG bit in skb_shinfo()->flags     when moving frags from source to destination. __pskb_copy_fclone() defers the rest of the shinfo metadata     to skb_copy_header() after copying frag descriptors, but that helper only carries over gso_{size,segs,     type} and never touches skb_shinfo()->flags; skb_shift() moves frag descriptors directly and leaves flags     untouched. As a result, the destination skb keeps a reference to the same externally-owned or page-cache-     backed pages while reporting skb_has_shared_frag() as false. The mismatch is harmful in any in-place     writer that uses skb_has_shared_frag() to decide whether shared pages must be detoured through     skb_cow_data(). ESP input is one such writer (esp4.c, esp6.c), and a single nft 'dup to <local>' rule --     or any other nf_dup_ipv4() / xt_TEE caller -- is enough to land a pskb_copy()'d skb in esp_input() with     the marker stripped, letting an unprivileged user write into the page cache of a root-owned read-only file     via authencesn-ESN stray writes. Set SKBFL_SHARED_FRAG on the destination whenever frag descriptors were     actually moved from the source. skb_copy() and skb_copy_expand() share skb_copy_header() too but linearize     all paged data into freshly allocated head storage and emerge with nr_frags == 0, so skb_has_shared_frag()     returns false on its own; they need no change. The same omission exists in skb_gro_receive() and     skb_gro_receive_list(). The former moves the incoming skb's frag descriptors into the accumulator's last     sub-skb via two paths (a direct frag-move loop and the head_frag + memcpy path); the latter chains the     incoming skb whole onto p's frag_list. Downstream skb_segment() reads only skb_shinfo(p)->flags, and     skb_segment_list() reuses each sub-skb's shinfo as the nskb -- both p and lp must carry the marker. The     same omission also exists in tcp_clone_payload(), which builds an MTU probe skb by moving frag descriptors     from skbs on sk_write_queue into a freshly allocated nskb. The helper falls into the same family and     warrants the same fix for consistency; no TCP TX-side in-place writer is currently known to reach a user     page through this gap, but a future consumer depending on the marker would regress silently. The same     omission exists in skb_segment(): the per-iteration flag merge takes only head_skb's flag, and the inner     switch that rebinds frag_skb to list_skb on head_skb-frags exhaustion does not fold the new frag_skb's     flag into nskb. Fold frag_skb's flag at both sites so segments drawing frags from frag_list members carry     the marker. (CVE-2026-43503)

Note that Nessus relies on the presence of the package as reported by the vendor.

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Linux Distros Unpatched Vulnerability : CVE-2026-43503

high Nessus Plugin ID 316600

Version 1.13

Version 1.12

Version 1.11

Version 1.10

Version 1.9

Version 1.8

Version 1.7

Version 1.6

Version 1.4

Version 1.3

Version 1.2

Version 1.1

Version 1.13 Jun 23, 2026, 12:45 PM Detection (updated detection logic) Plugin metadata Plugin Feed: 202606231245
Version 1.12 Jun 17, 2026, 2:25 PM Detection (updated detection logic) Plugin metadata Plugin Feed: 202606171425
Version 1.11 Jun 12, 2026, 7:53 PM Detection (updated detection logic) Plugin metadata Plugin Feed: 202606121953
Version 1.10 Jun 10, 2026, 6:51 AM Detection (updated detection logic) Plugin metadata Plugin Feed: 202606100651
Version 1.9 Jun 6, 2026, 1:00 AM Detection (updated detection logic) Plugin metadata Plugin Feed: 202606060100
Version 1.8 Jun 5, 2026, 1:04 PM Plugin metadata Detection (updated detection logic) Plugin Feed: 202606051304
Version 1.7 Jun 4, 2026, 12:19 PM Detection (updated detection logic) Plugin metadata Plugin Feed: 202606041219
Version 1.6 Jun 4, 2026, 6:01 AM CVSS metrics ("CVSSv2 score" set to 4.9) CVSS metrics ("CVSSv2 vector" set to "CVSS2#AV:L/AC:L/Au:N/C:N/I:C/A:N") Detection (updated detection logic) Plugin metadata Plugin Feed: 202606040601
Version 1.4 May 30, 2026, 6:41 AM CVSS metrics ("CVSSv3 score" set to 7.8) CVSS metrics ("CVSSv3 vector" set to "CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H") CVSSv3 severity (based on None, severity increased from "Low" to "High") Detection (updated detection logic) Plugin metadata CVSS metrics ("CVSSv2 score" set to 6.8) CVSS metrics ("CVSSv2 vector" set to "CVSS2#AV:L/AC:L/Au:S/C:C/I:C/A:C") Plugin Feed: 202605300641
Version 1.3 May 29, 2026, 5:27 PM Detection (updated detection logic) Plugin metadata Plugin Feed: 202605291727
Version 1.2 May 27, 2026, 12:56 AM Detection (updated detection logic) Plugin metadata Plugin Feed: 202605270056
Version 1.1 May 25, 2026, 10:30 PM New Plugin Feed: 202605252230