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CVE-2026-80852 (GCVE-0-2026-80852)

Vulnerability from cvelistv5 – Published: 2026-09-04 15:55 – Updated: 2026-09-04 15:55
VLAI
Title
tls: device: fix out-of-bounds write in tls_append_frag()
Summary
In the Linux kernel, the following vulnerability has been resolved: tls: device: fix out-of-bounds write in tls_append_frag() Found with syzkaller and a local syzbot instance running on top of a netdevsim TLS offload emulation; tls_device.c is otherwise only reachable on a machine with a NIC that implements the offload. tls_push_data() only checks whether the open record still has room for another frag at the bottom of its loop, and the MSG_MORE early break skips that check. The record survives to the next syscall with the frag count it already had, and tls_append_frag() does not check either, so with TLS_TX_ZEROCOPY_RO every splice(SPLICE_F_MORE) of a byte or two adds a non-coalescing pipe page and num_frags walks off the end of tls_record_info.frags[MAX_SKB_FRAGS]. Once the record is pushed, tls_push_record() runs the same index over sg_tx_data[MAX_SKB_FRAGS] and the sg_set_page() writes land on the destruct_work that follows it, which the workqueue then calls. The byte limit is fine because copy drops to 0 and the loop falls through to the same check; the frag count has no such feedback. Push the record rather than keep a full one open, which is what a plain TCP socket does - tcp_sendmsg_locked() uses tcp_mark_push() and new_segment in both the copy and the MSG_SPLICE_PAGES paths, and tls_sw already sets full_record when the sk_msg ring fills up, MSG_MORE or not. BUG: KASAN: slab-out-of-bounds in tls_append_frag ( net/tls/tls_device.c:269) Write of size 8 at addr ffff8881104d1530 by task tls_oob/450 CPU: 2 UID: 0 PID: 450 Comm: tls_oob Not tainted 7.2.0-rc7+ #329 PREEMPT Call Trace: <TASK> dump_stack_lvl (lib/dump_stack.c:94 lib/dump_stack.c:120) print_report (mm/kasan/report.c:378 mm/kasan/report.c:482) kasan_report (mm/kasan/report.c:595) tls_append_frag (net/tls/tls_device.c:269) tls_push_data (net/tls/tls_device.c:518) tls_device_sendmsg (net/tls/tls_device.c:583) inet_sendmsg (net/ipv4/af_inet.c:865) sock_sendmsg (net/socket.c:775 net/socket.c:790 net/socket.c:813) splice_to_socket (fs/splice.c:884) do_splice (fs/splice.c:936 fs/splice.c:1349) __do_splice (fs/splice.c:1431) __x64_sys_splice (fs/splice.c:1634 fs/splice.c:1616) do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94) entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121) </TASK> and, once the record is pushed: UBSAN: array-index-out-of-bounds in net/tls/tls_device.c:300:24 index 18 is out of range for type 'skb_frag_t [17]' UBSAN: array-index-out-of-bounds in net/tls/tls_device.c:301:41 index 18 is out of range for type 'scatterlist [17]' UBSAN: array-index-out-of-bounds in net/tls/tls_device.c:302:39 index 18 is out of range for type 'scatterlist [17]' UBSAN: array-index-out-of-bounds in net/tls/tls_device.c:307:38 index 26 is out of range for type 'scatterlist [17]' kernel tried to execute NX-protected page - exploit attempt? (uid: 0) BUG: unable to handle page fault for address: ffffea000411a680 #PF: supervisor instruction fetch in kernel mode #PF: error_code(0x0011) - permissions violation Oops: Oops: 0011 [#1] SMP KASAN PTI Workqueue: ktls_device_destruct 0xffffea000411a680 RIP: 0010:0xffffea000411a680 Call Trace: <TASK> worker_thread (kernel/workqueue.c:3405 kernel/workqueue.c:3486) kthread (kernel/kthread.c:436) ret_from_fork (arch/x86/kernel/process.c:158) ret_from_fork_asm (arch/x86/entry/entry_64.S:245) </TASK>
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: e8f69799810c32dd40c6724d829eccc70baad07f , < 03ced5da6120965d80ed56dbb7d78fa5c9128906 (git)
Affected: e8f69799810c32dd40c6724d829eccc70baad07f , < a832d7cb09da2a8e4e9734b4be14d3e76169d805 (git)
Affected: e8f69799810c32dd40c6724d829eccc70baad07f , < b7f10d4ff987bda038df90052cd4a1434a7412d4 (git)
Affected: e8f69799810c32dd40c6724d829eccc70baad07f , < fadbc1ed2a872a8649a44cf9e1cf9621fc58cd6e (git)
Affected: e8f69799810c32dd40c6724d829eccc70baad07f , < cd7e875b89597f3498917af764758391338d1802 (git)
Affected: e8f69799810c32dd40c6724d829eccc70baad07f , < 7e1208c135618358da5d7d6664874dc6e53c62fc (git)
Affected: e8f69799810c32dd40c6724d829eccc70baad07f , < b17cf742eaad70ae29ac558cefb3aa9bbeea03d4 (git)
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Linux Linux Affected: 4.18
Unaffected: 0 , < 4.18 (semver)
Unaffected: 6.1.187 , ≤ 6.1.* (semver)
Unaffected: 6.6.156 , ≤ 6.6.* (semver)
Unaffected: 6.12.108 , ≤ 6.12.* (semver)
Unaffected: 6.18.49 , ≤ 6.18.* (semver)
Unaffected: 7.1.13 , ≤ 7.1.* (semver)
Unaffected: 7.2.3 , ≤ 7.2.* (semver)
Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)
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{
  "containers": {
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        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntls: device: fix out-of-bounds write in tls_append_frag()\n\nFound with syzkaller and a local syzbot instance running on top of a\nnetdevsim TLS offload emulation; tls_device.c is otherwise only reachable\non a machine with a NIC that implements the offload.\n\ntls_push_data() only checks whether the open record still has room for\nanother frag at the bottom of its loop, and the MSG_MORE early break\nskips that check.  The record survives to the next syscall with the frag\ncount it already had, and tls_append_frag() does not check either, so\nwith TLS_TX_ZEROCOPY_RO every splice(SPLICE_F_MORE) of a byte or two adds\na non-coalescing pipe page and num_frags walks off the end of\ntls_record_info.frags[MAX_SKB_FRAGS].  Once the record is pushed,\ntls_push_record() runs the same index over sg_tx_data[MAX_SKB_FRAGS] and\nthe sg_set_page() writes land on the destruct_work that follows it, which\nthe workqueue then calls.\n\nThe byte limit is fine because copy drops to 0 and the loop falls through\nto the same check; the frag count has no such feedback.\n\nPush the record rather than keep a full one open, which is what a plain\nTCP socket does - tcp_sendmsg_locked() uses tcp_mark_push() and\nnew_segment in both the copy and the MSG_SPLICE_PAGES paths, and tls_sw\nalready sets full_record when the sk_msg ring fills up, MSG_MORE or not.\n\n  BUG: KASAN: slab-out-of-bounds in tls_append_frag ( net/tls/tls_device.c:269)\n  Write of size 8 at addr ffff8881104d1530 by task tls_oob/450\n\n  CPU: 2 UID: 0 PID: 450 Comm: tls_oob Not tainted 7.2.0-rc7+ #329 PREEMPT\n  Call Trace:\n   \u003cTASK\u003e\n   dump_stack_lvl (lib/dump_stack.c:94 lib/dump_stack.c:120)\n   print_report (mm/kasan/report.c:378 mm/kasan/report.c:482)\n   kasan_report (mm/kasan/report.c:595)\n   tls_append_frag (net/tls/tls_device.c:269)\n   tls_push_data (net/tls/tls_device.c:518)\n   tls_device_sendmsg (net/tls/tls_device.c:583)\n   inet_sendmsg (net/ipv4/af_inet.c:865)\n   sock_sendmsg (net/socket.c:775 net/socket.c:790 net/socket.c:813)\n   splice_to_socket (fs/splice.c:884)\n   do_splice (fs/splice.c:936 fs/splice.c:1349)\n   __do_splice (fs/splice.c:1431)\n   __x64_sys_splice (fs/splice.c:1634 fs/splice.c:1616)\n   do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)\n   entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)\n   \u003c/TASK\u003e\n\nand, once the record is pushed:\n\n  UBSAN: array-index-out-of-bounds in net/tls/tls_device.c:300:24\n  index 18 is out of range for type \u0027skb_frag_t [17]\u0027\n  UBSAN: array-index-out-of-bounds in net/tls/tls_device.c:301:41\n  index 18 is out of range for type \u0027scatterlist [17]\u0027\n  UBSAN: array-index-out-of-bounds in net/tls/tls_device.c:302:39\n  index 18 is out of range for type \u0027scatterlist [17]\u0027\n  UBSAN: array-index-out-of-bounds in net/tls/tls_device.c:307:38\n  index 26 is out of range for type \u0027scatterlist [17]\u0027\n\n  kernel tried to execute NX-protected page - exploit attempt? (uid: 0)\n  BUG: unable to handle page fault for address: ffffea000411a680\n  #PF: supervisor instruction fetch in kernel mode\n  #PF: error_code(0x0011) - permissions violation\n  Oops: Oops: 0011 [#1] SMP KASAN PTI\n  Workqueue: ktls_device_destruct 0xffffea000411a680\n  RIP: 0010:0xffffea000411a680\n  Call Trace:\n   \u003cTASK\u003e\n   worker_thread (kernel/workqueue.c:3405 kernel/workqueue.c:3486)\n   kthread (kernel/kthread.c:436)\n   ret_from_fork (arch/x86/kernel/process.c:158)\n   ret_from_fork_asm (arch/x86/entry/entry_64.S:245)\n   \u003c/TASK\u003e"
        }
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      "providerMetadata": {
        "dateUpdated": "2026-09-04T15:55:02.806Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/03ced5da6120965d80ed56dbb7d78fa5c9128906"
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        {
          "url": "https://git.kernel.org/stable/c/a832d7cb09da2a8e4e9734b4be14d3e76169d805"
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          "url": "https://git.kernel.org/stable/c/b7f10d4ff987bda038df90052cd4a1434a7412d4"
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        },
        {
          "url": "https://git.kernel.org/stable/c/b17cf742eaad70ae29ac558cefb3aa9bbeea03d4"
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      ],
      "title": "tls: device: fix out-of-bounds write in tls_append_frag()",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-80852",
    "datePublished": "2026-09-04T15:55:02.806Z",
    "dateReserved": "2026-08-26T14:34:25.797Z",
    "dateUpdated": "2026-09-04T15:55:02.806Z",
    "state": "PUBLISHED"
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  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-80852",
      "date": "2026-09-14",
      "epss": "0.00161",
      "percentile": "0.05619"
    },
    "microsoft_vex": {
      "current_release_date": "2026-09-07T01:49:28.000Z",
      "cve": "CVE-2026-80852",
      "id": "msrc_CVE-2026-80852",
      "initial_release_date": "2026-09-06T05:08:46.000Z",
      "product_status:known_affected": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "tls: device: fix out-of-bounds write in tls_append_frag()",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-80852.json",
      "version": "2"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-80852\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-09-04T16:18:14.073\",\"lastModified\":\"2026-09-04T16:18:14.073\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\ntls: device: fix out-of-bounds write in tls_append_frag()\\n\\nFound with syzkaller and a local syzbot instance running on top of a\\nnetdevsim TLS offload emulation; tls_device.c is otherwise only reachable\\non a machine with a NIC that implements the offload.\\n\\ntls_push_data() only checks whether the open record still has room for\\nanother frag at the bottom of its loop, and the MSG_MORE early break\\nskips that check.  The record survives to the next syscall with the frag\\ncount it already had, and tls_append_frag() does not check either, so\\nwith TLS_TX_ZEROCOPY_RO every splice(SPLICE_F_MORE) of a byte or two adds\\na non-coalescing pipe page and num_frags walks off the end of\\ntls_record_info.frags[MAX_SKB_FRAGS].  Once the record is pushed,\\ntls_push_record() runs the same index over sg_tx_data[MAX_SKB_FRAGS] and\\nthe sg_set_page() writes land on the destruct_work that follows it, which\\nthe workqueue then calls.\\n\\nThe byte limit is fine because copy drops to 0 and the loop falls through\\nto the same check; the frag count has no such feedback.\\n\\nPush the record rather than keep a full one open, which is what a plain\\nTCP socket does - tcp_sendmsg_locked() uses tcp_mark_push() and\\nnew_segment in both the copy and the MSG_SPLICE_PAGES paths, and tls_sw\\nalready sets full_record when the sk_msg ring fills up, MSG_MORE or not.\\n\\n  BUG: KASAN: slab-out-of-bounds in tls_append_frag ( net/tls/tls_device.c:269)\\n  Write of size 8 at addr ffff8881104d1530 by task tls_oob/450\\n\\n  CPU: 2 UID: 0 PID: 450 Comm: tls_oob Not tainted 7.2.0-rc7+ #329 PREEMPT\\n  Call Trace:\\n   \u003cTASK\u003e\\n   dump_stack_lvl (lib/dump_stack.c:94 lib/dump_stack.c:120)\\n   print_report (mm/kasan/report.c:378 mm/kasan/report.c:482)\\n   kasan_report (mm/kasan/report.c:595)\\n   tls_append_frag (net/tls/tls_device.c:269)\\n   tls_push_data (net/tls/tls_device.c:518)\\n   tls_device_sendmsg (net/tls/tls_device.c:583)\\n   inet_sendmsg (net/ipv4/af_inet.c:865)\\n   sock_sendmsg (net/socket.c:775 net/socket.c:790 net/socket.c:813)\\n   splice_to_socket (fs/splice.c:884)\\n   do_splice (fs/splice.c:936 fs/splice.c:1349)\\n   __do_splice (fs/splice.c:1431)\\n   __x64_sys_splice (fs/splice.c:1634 fs/splice.c:1616)\\n   do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)\\n   entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)\\n   \u003c/TASK\u003e\\n\\nand, once the record is pushed:\\n\\n  UBSAN: array-index-out-of-bounds in net/tls/tls_device.c:300:24\\n  index 18 is out of range for type \u0027skb_frag_t [17]\u0027\\n  UBSAN: array-index-out-of-bounds in net/tls/tls_device.c:301:41\\n  index 18 is out of range for type \u0027scatterlist [17]\u0027\\n  UBSAN: array-index-out-of-bounds in net/tls/tls_device.c:302:39\\n  index 18 is out of range for type \u0027scatterlist [17]\u0027\\n  UBSAN: array-index-out-of-bounds in net/tls/tls_device.c:307:38\\n  index 26 is out of range for type \u0027scatterlist [17]\u0027\\n\\n  kernel tried to execute NX-protected page - exploit attempt? (uid: 0)\\n  BUG: unable to handle page fault for address: ffffea000411a680\\n  #PF: supervisor instruction fetch in kernel mode\\n  #PF: error_code(0x0011) - permissions violation\\n  Oops: Oops: 0011 [#1] SMP KASAN PTI\\n  Workqueue: ktls_device_destruct 0xffffea000411a680\\n  RIP: 0010:0xffffea000411a680\\n  Call Trace:\\n   \u003cTASK\u003e\\n   worker_thread (kernel/workqueue.c:3405 kernel/workqueue.c:3486)\\n   kthread (kernel/kthread.c:436)\\n   ret_from_fork (arch/x86/kernel/process.c:158)\\n   ret_from_fork_asm (arch/x86/entry/entry_64.S:245)\\n   \u003c/TASK\u003e\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/tls/tls_device.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"e8f69799810c32dd40c6724d829eccc70baad07f\",\"lessThan\":\"03ced5da6120965d80ed56dbb7d78fa5c9128906\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"e8f69799810c32dd40c6724d829eccc70baad07f\",\"lessThan\":\"a832d7cb09da2a8e4e9734b4be14d3e76169d805\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"e8f69799810c32dd40c6724d829eccc70baad07f\",\"lessThan\":\"b7f10d4ff987bda038df90052cd4a1434a7412d4\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"e8f69799810c32dd40c6724d829eccc70baad07f\",\"lessThan\":\"fadbc1ed2a872a8649a44cf9e1cf9621fc58cd6e\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"e8f69799810c32dd40c6724d829eccc70baad07f\",\"lessThan\":\"cd7e875b89597f3498917af764758391338d1802\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"e8f69799810c32dd40c6724d829eccc70baad07f\",\"lessThan\":\"7e1208c135618358da5d7d6664874dc6e53c62fc\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"e8f69799810c32dd40c6724d829eccc70baad07f\",\"lessThan\":\"b17cf742eaad70ae29ac558cefb3aa9bbeea03d4\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/tls/tls_device.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"4.18\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"4.18\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.187\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.156\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.108\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.49\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.13\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2.3\",\"lessThanOrEqual\":\"7.2.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.3-rc1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/03ced5da6120965d80ed56dbb7d78fa5c9128906\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/7e1208c135618358da5d7d6664874dc6e53c62fc\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a832d7cb09da2a8e4e9734b4be14d3e76169d805\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b17cf742eaad70ae29ac558cefb3aa9bbeea03d4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b7f10d4ff987bda038df90052cd4a1434a7412d4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/cd7e875b89597f3498917af764758391338d1802\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/fadbc1ed2a872a8649a44cf9e1cf9621fc58cd6e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "suse_vex": {
      "aggregate_severity": "important",
      "current_release_date": "2026-09-10T01:50:31Z",
      "cve": "CVE-2026-80852",
      "id": "CVE-2026-80852",
      "initial_release_date": "2026-09-05T00:26:10Z",
      "product_status:known_affected": "335",
      "product_status:known_not_affected": "6",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-80852",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-80852.json",
      "version": "5"
    }
  }
}



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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.


Detection rules are retrieved from Rulezet.