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              "value": "AV:L - The vulnerable path is reached through local syscalls on the registered /dev/usbtmc* character device: open, asynchronous ioctl/read/write submission, then release. A USBTMC device must be present, but exploitation is driven from local device-file operations rather than network traffic.\nAC:L - The attacker can deliberately submit asynchronous URBs and drop the file reference before completion; the missing release-time drawdown makes the UAF deterministic enough to trigger. Any completion timing needed can be influenced by repeated attempts and, in the strongest scenario, by a controlled USBTMC device.\nPR:L - There are no capability or namespace-sensitive privilege checks in the usbtmc open/ioctl/release path. The attacker only needs ordinary local access sufficient to open the /dev/usbtmc* node.\nUI:N - No separate victim action is required once the attacker can access the device node. The attacker can open the file, issue the async operation, and cause release themselves.\nS:U - The corruption occurs within kernel USB/driver memory and affects the same kernel security authority. This is standard kernel memory corruption, not a VM, IOMMU, or sandbox boundary escape by itself.\nC:H - This is a use-after-free of per-file kernel state containing embedded USB anchors and callback context. Per the kernel scoring guidance, UAF memory corruption can be leveraged for high-impact information disclosure.\nI:H - The HCD giveback path and completion callbacks write through freed file_data/anchor memory, giving a heap corruption primitive. UAF corruption is defensibly scored as high integrity impact because it can support arbitrary write or control-flow exploitation.\nA:H - Syzbot reproduced a KASAN slab-use-after-free write in the USB giveback path after usbtmc_release freed the object. Even without full exploitation, this can crash or destabilize the kernel."
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            "value": "RHSA-2026:19540: NVIDIA for RHEL 10"
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            "value": "RHSA-2026:33486: NVIDIA for RHEL 10"
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            "value": "RHSA-2026:25044: Red Hat OpenShift Container Platform 4.16"
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            "lang": "en",
            "value": "RHSA-2026:20051: Red Hat Enterprise Linux BaseOS AUS (v.8.6), Red Hat Enterprise Linux BaseOS E4S (v.8.6), Red Hat Enterprise Linux BaseOS TUS (v.8.6)"
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            "value": "RHSA-2026:23471: Red Hat Enterprise Linux BaseOS E4S (v.8.8)"
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            "value": "RHSA-2026:23469: Red Hat Enterprise Linux BaseOS E4S (v.9.2)"
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            "value": "RHSA-2026:24814: Red Hat Enterprise Linux BaseOS E4S (v.9.4)"
          },
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            "lang": "en",
            "value": "RHSA-2026:23468: Red Hat Enterprise Linux BaseOS EUS (v.9.6)"
          },
          {
            "lang": "en",
            "value": "RHSA-2026:19664: Red Hat Enterprise Linux NFV (v. 8), Red Hat Enterprise Linux RT (v. 8)"
          },
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            "lang": "en",
            "value": "RHSA-2026:19711: Red Hat Enterprise Linux NFV E4S (v.9.0), Red Hat Enterprise Linux Real Time E4S (v.9.0)"
          },
          {
            "lang": "en",
            "value": "RHSA-2026:19875: Red Hat Enterprise Linux Real Time E4S (v.9.2), Red Hat Enterprise Linux Real Time for NFV E4S (v.9.2)"
          }
        ],
        "timeline": [
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            "lang": "en",
            "time": "2026-05-23T00:00:00.000Z",
            "value": "Reported to Red Hat."
          },
          {
            "lang": "en",
            "time": "2026-05-23T00:00:00.000Z",
            "value": "Made public."
          }
        ],
        "title": "kernel: net: skbuff: propagate shared-frag marker through frag-transfer helpers",
        "workarounds": [
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            "lang": "en",
            "value": "See the security bulletin for a detailed mitigation procedure."
          }
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              "versionType": "original_commit_for_fix"
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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."
        }
      ],
      "metrics": [
        {
          "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"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - Triggering the impact requires locally splicing a root-owned file\u0027s page-cache pages into a socket and configuring an xfrm SA plus an nftables `dup`/TEE rule; a purely remote peer cannot create externally-owned, page-cache-backed frags. Matches the predecessor CVE-2026-43284 (AV:L).\nAC:L - The attacker controls every condition \u2014 the SA key, the dup/TEE rule, the spliced file pages, and the crafted ESP packet \u2014 and can reliably reproduce the in-place decrypt with no race or layout dependency outside their control.\nPR:L - Requires only an unprivileged local user: CAP_NET_ADMIN for xfrm/nftables is obtainable via user namespaces (`unshare -Urn`), and only read access to a (e.g. world-readable) root-owned file is needed to splice its page-cache pages.\nUI:N - The attacker performs all steps; the page-cache corruption occurs at decrypt time with no action required from any victim.\nS:C - The vulnerable component (ESP/network packet processing acting on the attacker\u0027s own packet) modifies resources in a different security authority \u2014 the page cache of a root-owned read-only file \u2014 crossing a privilege boundary, as scored in the predecessor CVE-2026-43284 (S:C).\nC:H - The in-place AEAD operation reads and writes externally-owned/potentially-freed pages across a trust boundary, a memory-safety violation leverageable for information disclosure; scored C:H consistent with the predecessor.\nI:H - The decrypt writes attacker-influenced data into the page cache of a root-owned read-only file, corrupting content read by privileged processes \u2014 a powerful confused-deputy write primitive enabling privilege escalation.\nA:H - Writing into pages the skb does not own (page-cache or freed/reused spliced pages) is memory corruption that can crash or destabilize the kernel and corrupt file/system state."
            }
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      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:28:26.468Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/fbeab9555564a1b98e8582cd106dfe46c4606991"
        },
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        },
        {
          "url": "https://git.kernel.org/stable/c/48f6a5356a33dd78e7144ae1faef95ffc990aae0"
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      "title": "net: skbuff: propagate shared-frag marker through frag-transfer helpers",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-43503",
    "datePublished": "2026-05-23T11:44:01.103Z",
    "dateReserved": "2026-05-01T14:12:56.014Z",
    "dateUpdated": "2026-08-24T12:06:46.973Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbonding: alb: fix UAF in rlb_arp_recv during bond up/down\n\nThe ALB RX path may access rx_hashtbl concurrently with bond\nteardown. During rapid bond up/down cycles, rlb_deinitialize()\nfrees rx_hashtbl while RX handlers are still running, leading\nto a null pointer dereference detected by KASAN.\n\nHowever, the root cause is that rlb_arp_recv() can still be accessed\nafter setting recv_probe to NULL, which is actually a use-after-free\n(UAF) issue. That is the reason for using the referenced commit in the\nFixes tag.\n\n[  214.174138] Oops: general protection fault, probably for non-canonical address 0xdffffc000000001d: 0000 [#1] SMP KASAN PTI\n[  214.186478] KASAN: null-ptr-deref in range [0x00000000000000e8-0x00000000000000ef]\n[  214.194933] CPU: 30 UID: 0 PID: 2375 Comm: ping Kdump: loaded Not tainted 6.19.0-rc8+ #2 PREEMPT(voluntary)\n[  214.205907] Hardware name: Dell Inc. PowerEdge R730/0WCJNT, BIOS 2.14.0 01/14/2022\n[  214.214357] RIP: 0010:rlb_arp_recv+0x505/0xab0 [bonding]\n[  214.220320] Code: 0f 85 2b 05 00 00 48 b8 00 00 00 00 00 fc ff df 40 0f b6 ed 48 c1 e5 06 49 03 ad 78 01 00 00 48 8d 7d 28 48 89 fa 48 c1 ea 03 \u003c0f\u003e b6\n 04 02 84 c0 74 06 0f 8e 12 05 00 00 80 7d 28 00 0f 84 8c 00\n[  214.241280] RSP: 0018:ffffc900073d8870 EFLAGS: 00010206\n[  214.247116] RAX: dffffc0000000000 RBX: ffff888168556822 RCX: ffff88816855681e\n[  214.255082] RDX: 000000000000001d RSI: dffffc0000000000 RDI: 00000000000000e8\n[  214.263048] RBP: 00000000000000c0 R08: 0000000000000002 R09: ffffed11192021c8\n[  214.271013] R10: ffff8888c9010e43 R11: 0000000000000001 R12: 1ffff92000e7b119\n[  214.278978] R13: ffff8888c9010e00 R14: ffff888168556822 R15: ffff888168556810\n[  214.286943] FS:  00007f85d2d9cb80(0000) GS:ffff88886ccb3000(0000) knlGS:0000000000000000\n[  214.295966] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n[  214.302380] CR2: 00007f0d047b5e34 CR3: 00000008a1c2e002 CR4: 00000000001726f0\n[  214.310347] Call Trace:\n[  214.313070]  \u003cIRQ\u003e\n[  214.315318]  ? __pfx_rlb_arp_recv+0x10/0x10 [bonding]\n[  214.320975]  bond_handle_frame+0x166/0xb60 [bonding]\n[  214.326537]  ? __pfx_bond_handle_frame+0x10/0x10 [bonding]\n[  214.332680]  __netif_receive_skb_core.constprop.0+0x576/0x2710\n[  214.339199]  ? __pfx_arp_process+0x10/0x10\n[  214.343775]  ? sched_balance_find_src_group+0x98/0x630\n[  214.349513]  ? __pfx___netif_receive_skb_core.constprop.0+0x10/0x10\n[  214.356513]  ? arp_rcv+0x307/0x690\n[  214.360311]  ? __pfx_arp_rcv+0x10/0x10\n[  214.364499]  ? __lock_acquire+0x58c/0xbd0\n[  214.368975]  __netif_receive_skb_one_core+0xae/0x1b0\n[  214.374518]  ? __pfx___netif_receive_skb_one_core+0x10/0x10\n[  214.380743]  ? lock_acquire+0x10b/0x140\n[  214.385026]  process_backlog+0x3f1/0x13a0\n[  214.389502]  ? process_backlog+0x3aa/0x13a0\n[  214.394174]  __napi_poll.constprop.0+0x9f/0x370\n[  214.399233]  net_rx_action+0x8c1/0xe60\n[  214.403423]  ? __pfx_net_rx_action+0x10/0x10\n[  214.408193]  ? lock_acquire.part.0+0xbd/0x260\n[  214.413058]  ? sched_clock_cpu+0x6c/0x540\n[  214.417540]  ? mark_held_locks+0x40/0x70\n[  214.421920]  handle_softirqs+0x1fd/0x860\n[  214.426302]  ? __pfx_handle_softirqs+0x10/0x10\n[  214.431264]  ? __neigh_event_send+0x2d6/0xf50\n[  214.436131]  do_softirq+0xb1/0xf0\n[  214.439830]  \u003c/IRQ\u003e\n\nThe issue is reproducible by repeatedly running\nip link set bond0 up/down while receiving ARP messages, where\nrlb_arp_recv() can race with rlb_deinitialize() and dereference\na freed rx_hashtbl entry.\n\nFix this by setting recv_probe to NULL and then calling\nsynchronize_net() to wait for any concurrent RX processing to finish.\nThis ensures that no RX handler can access rx_hashtbl after it is freed\nin bond_alb_deinitialize()."
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        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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              "lang": "en",
              "value": "AV:L - The vulnerable code is reached via a received ARP frame on a bond slave; an unprivileged local user can reproduce the entire scenario inside a user namespace (`unshare -Urn`) by creating a balance-alb bond over veths, injecting ARP locally, and cycling the bond up/down, so no network/adjacent position is required.\nAC:L - In the user-namespace scenario the attacker controls both sides of the race \u2014 the ARP injection (RX side) and the bond up/down cycling (free side) \u2014 and the upstream report confirms it is readily reproducible by repeated cycling, so the race can be won reliably.\nPR:L - Triggering the free requires CAP_NET_ADMIN on the bond, but this is obtainable by any unprivileged user via a user+network namespace (which also grants CAP_NET_RAW for ARP injection), so only basic local user privileges are needed.\nUI:N - No victim interaction is required; the attacker drives both the packet receipt and the bond teardown themselves.\nS:U - The vulnerability and its impact are confined to the kernel\u0027s own security authority; there is no crossing of a VM/IOMMU/sandbox boundary.\nC:H - The UAF reads the contents of the freed `rx_hashtbl` object (after potential reallocation), which can be leveraged to disclose attacker-influenced or adjacent kernel heap data.\nI:H - The UAF writes into the freed/reallocated object, including copying 6 attacker-controlled bytes (the ARP source MAC) and link-pointer updates, providing a write primitive into reclaimed heap memory exploitable for control-flow corruption.\nA:H - The bug causes a KASAN-detected general protection fault / kernel oops (as shown in the report), reliably crashing the kernel."
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