CVE-2026-43503 (GCVE-0-2026-43503)

Vulnerability from cvelistv5 – Published: 2026-05-23 11:44 – Updated: 2026-07-03 12:05
VLAI
Title
net: skbuff: propagate shared-frag marker through frag-transfer helpers
Summary
In the Linux kernel, the following vulnerability has been resolved: 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.
CWE
  • CWE-664 - Improper Control of a Resource Through its Lifetime
Assigner
References
URL Tags
https://git.kernel.org/stable/c/fbeab9555564a1b98…
https://git.kernel.org/stable/c/179f1852bdedc300e…
https://git.kernel.org/stable/c/12401fcfb01f53ccc…
https://git.kernel.org/stable/c/989214c66884d7071…
https://git.kernel.org/stable/c/fc6eb39c55e97df2f…
https://git.kernel.org/stable/c/ff375cc75f9167168…
https://git.kernel.org/stable/c/9bc9d6d6967a2239a…
https://git.kernel.org/stable/c/48f6a5356a33dd78e…
https://access.redhat.com/security/cve/CVE-2026-43503 vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2480902 issue-trackingx_refsource_REDHAT
https://security.access.redhat.com/data/csaf/v2/v… x_sadp-csaf-vex
https://access.redhat.com/errata/RHSA-2026:19540 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:33486 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:21695 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:21690 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:23233 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:20087 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:25044 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:21656 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:23245 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:21702 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:23240 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:20299 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:19569 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:19705 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:20593 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:20054 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:20129 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:19568 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:19666 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:23470 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:20130 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:20051 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:19521 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:23471 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:23469 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:24814 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:23468 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:19664 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:19711 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:19875 vendor-advisoryx_refsource_REDHAT
Impacted products
Vendor Product Version
Linux Linux Affected: cef401de7be8c4e155c6746bfccf721a4fa5fab9 , < fbeab9555564a1b98e8582cd106dfe46c4606991 (git)
Affected: cef401de7be8c4e155c6746bfccf721a4fa5fab9 , < 179f1852bdedc300e373e807cc102cd81feff196 (git)
Affected: cef401de7be8c4e155c6746bfccf721a4fa5fab9 , < 12401fcfb01f53ccc63ab0a3246570fe8f3105ee (git)
Affected: cef401de7be8c4e155c6746bfccf721a4fa5fab9 , < 989214c66884d70716d83dc1d0bf5e16287bf349 (git)
Affected: cef401de7be8c4e155c6746bfccf721a4fa5fab9 , < fc6eb39c55e97df2f94ad974b8a5bbcd019da2c8 (git)
Affected: cef401de7be8c4e155c6746bfccf721a4fa5fab9 , < ff375cc75f9167168db38e0464a482d5fbc8d81d (git)
Affected: cef401de7be8c4e155c6746bfccf721a4fa5fab9 , < 9bc9d6d6967a2239aa57af2aa53554eddd640d20 (git)
Affected: cef401de7be8c4e155c6746bfccf721a4fa5fab9 , < 48f6a5356a33dd78e7144ae1faef95ffc990aae0 (git)
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Linux Linux Affected: 3.9
Unaffected: 0 , < 3.9 (semver)
Unaffected: 5.10.257 , ≤ 5.10.* (semver)
Unaffected: 5.15.208 , ≤ 5.15.* (semver)
Unaffected: 6.1.174 , ≤ 6.1.* (semver)
Unaffected: 6.6.141 , ≤ 6.6.* (semver)
Unaffected: 6.12.91 , ≤ 6.12.* (semver)
Unaffected: 6.18.33 , ≤ 6.18.* (semver)
Unaffected: 7.0.10 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
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Red Hat NVIDIA for RHEL 10     cpe:/a:redhat:enterprise_linux_nvidia:10::el10
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Red Hat Red Hat OpenShift Container Platform 4.12     cpe:/a:redhat:openshift:4.12::el8
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Red Hat Red Hat OpenShift Container Platform 4.13     cpe:/a:redhat:openshift:4.13::el9
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Red Hat Red Hat OpenShift Container Platform 4.15     cpe:/a:redhat:openshift:4.15::el9
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Red Hat Red Hat OpenShift Container Platform 4.16     cpe:/a:redhat:openshift:4.16::el9
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Red Hat Red Hat OpenShift Container Platform 4.18     cpe:/a:redhat:openshift:4.18::el9
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Red Hat Red Hat OpenShift Container Platform 4.19     cpe:/a:redhat:openshift:4.19::el9
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Red Hat Red Hat OpenShift Container Platform 4.20     cpe:/a:redhat:openshift:4.20::el9
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Red Hat Red Hat OpenShift Container Platform 4.21     cpe:/a:redhat:openshift:4.21::el9
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Red Hat Red Hat Enterprise Linux AppStream EUS (v. 10.0)     cpe:/o:redhat:enterprise_linux_eus:10.0
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Red Hat Red Hat Enterprise Linux AppStream (v. 10)     cpe:/o:redhat:enterprise_linux:10.2
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Red Hat Red Hat Enterprise Linux AppStream E4S (v.9.0)     cpe:/a:redhat:rhel_e4s:9.0::appstream
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Red Hat Red Hat Enterprise Linux AppStream E4S (v.9.2)     cpe:/a:redhat:rhel_e4s:9.2::appstream
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Red Hat Red Hat Enterprise Linux AppStream EUS (v.9.4)     cpe:/a:redhat:rhel_eus:9.4::appstream
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Red Hat Red Hat Enterprise Linux AppStream EUS (v.9.6)     cpe:/a:redhat:rhel_eus:9.6::appstream
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Red Hat Red Hat Enterprise Linux AppStream (v. 9)     cpe:/a:redhat:enterprise_linux:9::appstream
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Red Hat Red Hat Enterprise Linux BaseOS EUS (v. 10.0)     cpe:/o:redhat:enterprise_linux_eus:10.0
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Red Hat Red Hat Enterprise Linux BaseOS (v. 10)     cpe:/o:redhat:enterprise_linux:10.2
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Red Hat Red Hat Enterprise Linux BaseOS (v. 8)     cpe:/o:redhat:enterprise_linux:8::baseos
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Red Hat Red Hat Enterprise Linux BaseOS AUS (v.8.4)     cpe:/o:redhat:rhel_aus:8.4::baseos
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Red Hat Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.4)     cpe:/o:redhat:rhel_eus_long_life:8.4::baseos
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Red Hat Red Hat Enterprise Linux BaseOS AUS (v.8.6)     cpe:/o:redhat:rhel_aus:8.6::baseos
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Red Hat Red Hat Enterprise Linux BaseOS E4S (v.8.6)     cpe:/o:redhat:rhel_e4s:8.6::baseos
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Red Hat Red Hat Enterprise Linux BaseOS TUS (v.8.6)     cpe:/o:redhat:rhel_tus:8.6::baseos
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Red Hat Red Hat Enterprise Linux BaseOS E4S (v.8.8)     cpe:/o:redhat:rhel_e4s:8.8::baseos
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Red Hat Red Hat Enterprise Linux BaseOS TUS (v.8.8)     cpe:/o:redhat:rhel_tus:8.8::baseos
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Red Hat Red Hat Enterprise Linux BaseOS E4S (v.9.0)     cpe:/o:redhat:rhel_e4s:9.0::baseos
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Red Hat Red Hat Enterprise Linux BaseOS E4S (v.9.2)     cpe:/o:redhat:rhel_e4s:9.2::baseos
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Red Hat Red Hat Enterprise Linux BaseOS E4S (v.9.4)     cpe:/o:redhat:rhel_e4s:9.4::baseos
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Red Hat Red Hat Enterprise Linux BaseOS EUS (v.9.4)     cpe:/o:redhat:rhel_eus:9.4::baseos
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Red Hat Red Hat Enterprise Linux BaseOS EUS (v.9.6)     cpe:/o:redhat:rhel_eus:9.6::baseos
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Red Hat Red Hat Enterprise Linux BaseOS (v. 9)     cpe:/o:redhat:enterprise_linux:9::baseos
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Red Hat Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0)     cpe:/o:redhat:enterprise_linux_eus:10.0
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Red Hat Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)     cpe:/o:redhat:enterprise_linux:10.2
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Red Hat Red Hat Enterprise Linux CRB (v. 8)     cpe:/a:redhat:enterprise_linux:8::crb
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Red Hat Red Hat CodeReady Linux Builder EUS (v.9.4)     cpe:/a:redhat:rhel_eus:9.4::crb
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Red Hat Red Hat CodeReady Linux Builder EUS (v.9.6)     cpe:/a:redhat:rhel_eus:9.6::crb
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Red Hat Red Hat Enterprise Linux CodeReady Linux Builder (v. 9)     cpe:/a:redhat:enterprise_linux:9::crb
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Red Hat Red Hat Enterprise Linux Real Time for NFV EUS (v. 10.0)     cpe:/o:redhat:enterprise_linux_eus:10.0
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Red Hat Red Hat Enterprise Linux Real Time for NFV (v. 10)     cpe:/o:redhat:enterprise_linux:10.2
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Red Hat Red Hat Enterprise Linux NFV (v. 8)     cpe:/a:redhat:enterprise_linux:8::nfv
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Red Hat Red Hat Enterprise Linux NFV E4S (v.9.0)     cpe:/a:redhat:rhel_e4s:9.0::nfv
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Red Hat Red Hat Enterprise Linux Real Time for NFV E4S (v.9.2)     cpe:/a:redhat:rhel_e4s:9.2::nfv
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Red Hat Red Hat Enterprise Linux Real Time for NFV EUS (v.9.4)     cpe:/a:redhat:rhel_eus:9.4::nfv
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Red Hat Red Hat Enterprise Linux Real Time for NFV EUS (v.9.6)     cpe:/a:redhat:rhel_eus:9.6::nfv
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Red Hat Red Hat Enterprise Linux Real Time for NFV (v. 9)     cpe:/a:redhat:enterprise_linux:9::nfv
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Red Hat Red Hat Enterprise Linux Real Time EUS (v. 10.0)     cpe:/o:redhat:enterprise_linux_eus:10.0
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Red Hat Red Hat Enterprise Linux Real Time (v. 10)     cpe:/o:redhat:enterprise_linux:10.2
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Red Hat Red Hat Enterprise Linux RT (v. 8)     cpe:/a:redhat:enterprise_linux:8::realtime
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Red Hat Red Hat Enterprise Linux Real Time E4S (v.9.0)     cpe:/a:redhat:rhel_e4s:9.0::realtime
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Red Hat Red Hat Enterprise Linux Real Time E4S (v.9.2)     cpe:/a:redhat:rhel_e4s:9.2::realtime
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Red Hat Red Hat Enterprise Linux Real Time EUS (v.9.4)     cpe:/a:redhat:rhel_eus:9.4::realtime
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Red Hat Red Hat Enterprise Linux Real Time EUS (v.9.6)     cpe:/a:redhat:rhel_eus:9.6::realtime
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Red Hat Red Hat Enterprise Linux Real Time (v. 9)     cpe:/a:redhat:enterprise_linux:9::realtime
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Red Hat Red Hat Enterprise Linux 6     cpe:/o:redhat:enterprise_linux:6
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Red Hat Red Hat Enterprise Linux 7     cpe:/o:redhat:enterprise_linux:7
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Red Hat Red Hat OpenShift Container Platform 4     cpe:/a:redhat:openshift:4
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Show details on NVD website

{
  "containers": {
    "adp": [
      {
        "affected": [
          {
            "cpes": [
              "cpe:/a:redhat:enterprise_linux_nvidia:10::el10"
            ],
            "defaultStatus": "affected",
            "product": "NVIDIA for RHEL 10",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/a:redhat:openshift:4.12::el8"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat OpenShift Container Platform 4.12",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/a:redhat:openshift:4.13::el9"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat OpenShift Container Platform 4.13",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/a:redhat:openshift:4.15::el9"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat OpenShift Container Platform 4.15",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/a:redhat:openshift:4.16::el9"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat OpenShift Container Platform 4.16",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/a:redhat:openshift:4.18::el9"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat OpenShift Container Platform 4.18",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/a:redhat:openshift:4.19::el9"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat OpenShift Container Platform 4.19",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/a:redhat:openshift:4.20::el9"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat OpenShift Container Platform 4.20",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/a:redhat:openshift:4.21::el9"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat OpenShift Container Platform 4.21",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/o:redhat:enterprise_linux_eus:10.0"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat Enterprise Linux AppStream EUS (v. 10.0)",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/o:redhat:enterprise_linux:10.2"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat Enterprise Linux AppStream (v. 10)",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/a:redhat:rhel_e4s:9.0::appstream"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat Enterprise Linux AppStream E4S (v.9.0)",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/a:redhat:rhel_e4s:9.2::appstream"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat Enterprise Linux AppStream E4S (v.9.2)",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/a:redhat:rhel_eus:9.4::appstream"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat Enterprise Linux AppStream EUS (v.9.4)",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/a:redhat:rhel_eus:9.6::appstream"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat Enterprise Linux AppStream EUS (v.9.6)",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/a:redhat:enterprise_linux:9::appstream"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat Enterprise Linux AppStream (v. 9)",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/o:redhat:enterprise_linux_eus:10.0"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat Enterprise Linux BaseOS EUS (v. 10.0)",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/o:redhat:enterprise_linux:10.2"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat Enterprise Linux BaseOS (v. 10)",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/o:redhat:enterprise_linux:8::baseos"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat Enterprise Linux BaseOS (v. 8)",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/o:redhat:rhel_aus:8.4::baseos"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat Enterprise Linux BaseOS AUS (v.8.4)",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/o:redhat:rhel_eus_long_life:8.4::baseos"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.4)",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/o:redhat:rhel_aus:8.6::baseos"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat Enterprise Linux BaseOS AUS (v.8.6)",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/o:redhat:rhel_e4s:8.6::baseos"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat Enterprise Linux BaseOS E4S (v.8.6)",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/o:redhat:rhel_tus:8.6::baseos"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat Enterprise Linux BaseOS TUS (v.8.6)",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/o:redhat:rhel_e4s:8.8::baseos"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat Enterprise Linux BaseOS E4S (v.8.8)",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/o:redhat:rhel_tus:8.8::baseos"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat Enterprise Linux BaseOS TUS (v.8.8)",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/o:redhat:rhel_e4s:9.0::baseos"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat Enterprise Linux BaseOS E4S (v.9.0)",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/o:redhat:rhel_e4s:9.2::baseos"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat Enterprise Linux BaseOS E4S (v.9.2)",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/o:redhat:rhel_e4s:9.4::baseos"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat Enterprise Linux BaseOS E4S (v.9.4)",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/o:redhat:rhel_eus:9.4::baseos"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat Enterprise Linux BaseOS EUS (v.9.4)",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
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            "net/ipv4/tcp_output.c"
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          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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              "status": "unaffected",
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              "status": "unaffected",
              "version": "6.12.91",
              "versionType": "semver"
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              "lessThanOrEqual": "6.18.*",
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              "status": "unaffected",
              "version": "7.0.10",
              "versionType": "semver"
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: skbuff: propagate shared-frag marker through frag-transfer helpers\n\nTwo frag-transfer helpers (__pskb_copy_fclone() and skb_shift()) fail\nto propagate the SKBFL_SHARED_FRAG bit in skb_shinfo()-\u003eflags when\nmoving frags from source to destination.  __pskb_copy_fclone() defers\nthe rest of the shinfo metadata to skb_copy_header() after copying\nfrag descriptors, but that helper only carries over gso_{size,segs,\ntype} and never touches skb_shinfo()-\u003eflags; skb_shift() moves frag\ndescriptors directly and leaves flags untouched.  As a result, the\ndestination skb keeps a reference to the same externally-owned or\npage-cache-backed pages while reporting skb_has_shared_frag() as\nfalse.\n\nThe mismatch is harmful in any in-place writer that uses\nskb_has_shared_frag() to decide whether shared pages must be detoured\nthrough skb_cow_data().  ESP input is one such writer (esp4.c,\nesp6.c), and a single nft \u0027dup to \u003clocal\u003e\u0027 rule -- or any other\nnf_dup_ipv4() / xt_TEE caller -- is enough to land a pskb_copy()\u0027d\nskb in esp_input() with the marker stripped, letting an unprivileged\nuser write into the page cache of a root-owned read-only file via\nauthencesn-ESN stray writes.\n\nSet SKBFL_SHARED_FRAG on the destination whenever frag descriptors\nwere actually moved from the source.  skb_copy() and skb_copy_expand()\nshare skb_copy_header() too but linearize all paged data into freshly\nallocated head storage and emerge with nr_frags == 0, so\nskb_has_shared_frag() returns false on its own; they need no change.\n\nThe same omission exists in skb_gro_receive() and skb_gro_receive_list().\nThe former moves the incoming skb\u0027s frag descriptors into the\naccumulator\u0027s last sub-skb via two paths (a direct frag-move loop and\nthe head_frag + memcpy path); the latter chains the incoming skb whole\nonto p\u0027s frag_list.  Downstream skb_segment() reads only\nskb_shinfo(p)-\u003eflags, and skb_segment_list() reuses each sub-skb\u0027s\nshinfo as the nskb -- both p and lp must carry the marker.\n\nThe same omission also exists in tcp_clone_payload(), which builds an\nMTU probe skb by moving frag descriptors from skbs on sk_write_queue\ninto a freshly allocated nskb.  The helper falls into the same family\nand warrants the same fix for consistency; no TCP TX-side in-place\nwriter is currently known to reach a user page through this gap, but\na future consumer depending on the marker would regress silently.\n\nThe same omission exists in skb_segment(): the per-iteration flag\nmerge takes only head_skb\u0027s flag, and the inner switch that rebinds\nfrag_skb to list_skb on head_skb-frags exhaustion does not fold the\nnew frag_skb\u0027s flag into nskb.  Fold frag_skb\u0027s flag at both sites\nso segments drawing frags from frag_list members carry the marker."
        }
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      "metrics": [
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          "cvssV3_1": {
            "baseScore": 8.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
            "version": "3.1"
          }
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      "providerMetadata": {
        "dateUpdated": "2026-06-14T17:45:49.109Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/fbeab9555564a1b98e8582cd106dfe46c4606991"
        },
        {
          "url": "https://git.kernel.org/stable/c/179f1852bdedc300e373e807cc102cd81feff196"
        },
        {
          "url": "https://git.kernel.org/stable/c/12401fcfb01f53ccc63ab0a3246570fe8f3105ee"
        },
        {
          "url": "https://git.kernel.org/stable/c/989214c66884d70716d83dc1d0bf5e16287bf349"
        },
        {
          "url": "https://git.kernel.org/stable/c/fc6eb39c55e97df2f94ad974b8a5bbcd019da2c8"
        },
        {
          "url": "https://git.kernel.org/stable/c/ff375cc75f9167168db38e0464a482d5fbc8d81d"
        },
        {
          "url": "https://git.kernel.org/stable/c/9bc9d6d6967a2239aa57af2aa53554eddd640d20"
        },
        {
          "url": "https://git.kernel.org/stable/c/48f6a5356a33dd78e7144ae1faef95ffc990aae0"
        }
      ],
      "title": "net: skbuff: propagate shared-frag marker through frag-transfer helpers",
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        "engine": "bippy-1.2.0"
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    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-43503",
    "datePublished": "2026-05-23T11:44:01.103Z",
    "dateReserved": "2026-05-01T14:12:56.014Z",
    "dateUpdated": "2026-07-03T12:05:13.320Z",
    "state": "PUBLISHED"
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  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-43503",
      "date": "2026-07-04",
      "epss": "0.00135",
      "percentile": "0.03299"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-43503\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-05-23T12:17:02.547\",\"lastModified\":\"2026-07-02T12:17:20.070\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnet: skbuff: propagate shared-frag marker through frag-transfer helpers\\n\\nTwo frag-transfer helpers (__pskb_copy_fclone() and skb_shift()) fail\\nto propagate the SKBFL_SHARED_FRAG bit in skb_shinfo()-\u003eflags when\\nmoving frags from source to destination.  __pskb_copy_fclone() defers\\nthe rest of the shinfo metadata to skb_copy_header() after copying\\nfrag descriptors, but that helper only carries over gso_{size,segs,\\ntype} and never touches skb_shinfo()-\u003eflags; skb_shift() moves frag\\ndescriptors directly and leaves flags untouched.  As a result, the\\ndestination skb keeps a reference to the same externally-owned or\\npage-cache-backed pages while reporting skb_has_shared_frag() as\\nfalse.\\n\\nThe mismatch is harmful in any in-place writer that uses\\nskb_has_shared_frag() to decide whether shared pages must be detoured\\nthrough skb_cow_data().  ESP input is one such writer (esp4.c,\\nesp6.c), and a single nft \u0027dup to \u003clocal\u003e\u0027 rule -- or any other\\nnf_dup_ipv4() / xt_TEE caller -- is enough to land a pskb_copy()\u0027d\\nskb in esp_input() with the marker stripped, letting an unprivileged\\nuser write into the page cache of a root-owned read-only file via\\nauthencesn-ESN stray writes.\\n\\nSet SKBFL_SHARED_FRAG on the destination whenever frag descriptors\\nwere actually moved from the source.  skb_copy() and skb_copy_expand()\\nshare skb_copy_header() too but linearize all paged data into freshly\\nallocated head storage and emerge with nr_frags == 0, so\\nskb_has_shared_frag() returns false on its own; they need no change.\\n\\nThe same omission exists in skb_gro_receive() and skb_gro_receive_list().\\nThe former moves the incoming skb\u0027s frag descriptors into the\\naccumulator\u0027s last sub-skb via two paths (a direct frag-move loop and\\nthe head_frag + memcpy path); the latter chains the incoming skb whole\\nonto p\u0027s frag_list.  Downstream skb_segment() reads only\\nskb_shinfo(p)-\u003eflags, and skb_segment_list() reuses each sub-skb\u0027s\\nshinfo as the nskb -- both p and lp must carry the marker.\\n\\nThe same omission also exists in tcp_clone_payload(), which builds an\\nMTU probe skb by moving frag descriptors from skbs on sk_write_queue\\ninto a freshly allocated nskb.  The helper falls into the same family\\nand warrants the same fix for consistency; no TCP TX-side in-place\\nwriter is currently known to reach a user page through this gap, but\\na future consumer depending on the marker would regress silently.\\n\\nThe same omission exists in skb_segment(): the per-iteration flag\\nmerge takes only head_skb\u0027s flag, and the inner switch that rebinds\\nfrag_skb to list_skb on head_skb-frags exhaustion does not fold the\\nnew frag_skb\u0027s flag into nskb.  Fold frag_skb\u0027s flag at both sites\\nso segments drawing frags from frag_list members carry the marker.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/core/gro.c\",\"net/core/skbuff.c\",\"net/ipv4/tcp_output.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"cef401de7be8c4e155c6746bfccf721a4fa5fab9\",\"lessThan\":\"fbeab9555564a1b98e8582cd106dfe46c4606991\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"cef401de7be8c4e155c6746bfccf721a4fa5fab9\",\"lessThan\":\"179f1852bdedc300e373e807cc102cd81feff196\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"cef401de7be8c4e155c6746bfccf721a4fa5fab9\",\"lessThan\":\"12401fcfb01f53ccc63ab0a3246570fe8f3105ee\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"cef401de7be8c4e155c6746bfccf721a4fa5fab9\",\"lessThan\":\"989214c66884d70716d83dc1d0bf5e16287bf349\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"cef401de7be8c4e155c6746bfccf721a4fa5fab9\",\"lessThan\":\"fc6eb39c55e97df2f94ad974b8a5bbcd019da2c8\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"cef401de7be8c4e155c6746bfccf721a4fa5fab9\",\"lessThan\":\"ff375cc75f9167168db38e0464a482d5fbc8d81d\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"cef401de7be8c4e155c6746bfccf721a4fa5fab9\",\"lessThan\":\"9bc9d6d6967a2239aa57af2aa53554eddd640d20\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"cef401de7be8c4e155c6746bfccf721a4fa5fab9\",\"lessThan\":\"48f6a5356a33dd78e7144ae1faef95ffc990aae0\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/core/gro.c\",\"net/core/skbuff.c\",\"net/ipv4/tcp_output.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"3.9\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"3.9\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.257\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.208\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.174\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.141\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.91\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.33\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.0.10\",\"lessThanOrEqual\":\"7.0.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]},{\"source\":\"0b0ca135-0b70-47e7-9f44-1890c2a1c46c\",\"affectedData\":[{\"vendor\":\"Red 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  }
}


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

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Detection rules are retrieved from Rulezet.

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