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vuln-cve/data/2026/80xxx/CVE-2026-80852.json
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{
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"cveMetadata": {
"cveId": "CVE-2026-80852",
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"state": "PUBLISHED",
"assignerShortName": "Linux",
"dateReserved": "2026-08-26T14:34:25.797Z",
"datePublished": "2026-09-04T15:55:02.806Z",
"dateUpdated": "2026-10-30T12:31:15.036Z"
},
"containers": {
"cna": {
"providerMetadata": {
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux",
"dateUpdated": "2026-10-30T12:31:15.036Z"
},
"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 <TASK>\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 </TASK>\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 'skb_frag_t [17]'\n UBSAN: array-index-out-of-bounds in net/tls/tls_device.c:301:41\n index 18 is out of range for type 'scatterlist [17]'\n UBSAN: array-index-out-of-bounds in net/tls/tls_device.c:302:39\n index 18 is out of range for type 'scatterlist [17]'\n UBSAN: array-index-out-of-bounds in net/tls/tls_device.c:307:38\n index 26 is out of range for type 'scatterlist [17]'\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 <TASK>\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 </TASK>"
}
],
"affected": [
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "unaffected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"net/tls/tls_device.c"
],
"versions": [
{
"version": "e8f69799810c32dd40c6724d829eccc70baad07f",
"lessThan": "bc09411a11b5a676c59ff8612c6873d014f6fb36",
"status": "affected",
"versionType": "git"
},
{
"version": "e8f69799810c32dd40c6724d829eccc70baad07f",
"lessThan": "1fc6eb0c756b8be693b72e9e636ae5e236dcb6ee",
"status": "affected",
"versionType": "git"
},
{
"version": "e8f69799810c32dd40c6724d829eccc70baad07f",
"lessThan": "03ced5da6120965d80ed56dbb7d78fa5c9128906",
"status": "affected",
"versionType": "git"
},
{
"version": "e8f69799810c32dd40c6724d829eccc70baad07f",
"lessThan": "a832d7cb09da2a8e4e9734b4be14d3e76169d805",
"status": "affected",
"versionType": "git"
},
{
"version": "e8f69799810c32dd40c6724d829eccc70baad07f",
"lessThan": "b7f10d4ff987bda038df90052cd4a1434a7412d4",
"status": "affected",
"versionType": "git"
},
{
"version": "e8f69799810c32dd40c6724d829eccc70baad07f",
"lessThan": "fadbc1ed2a872a8649a44cf9e1cf9621fc58cd6e",
"status": "affected",
"versionType": "git"
},
{
"version": "e8f69799810c32dd40c6724d829eccc70baad07f",
"lessThan": "cd7e875b89597f3498917af764758391338d1802",
"status": "affected",
"versionType": "git"
},
{
"version": "e8f69799810c32dd40c6724d829eccc70baad07f",
"lessThan": "7e1208c135618358da5d7d6664874dc6e53c62fc",
"status": "affected",
"versionType": "git"
},
{
"version": "e8f69799810c32dd40c6724d829eccc70baad07f",
"lessThan": "b17cf742eaad70ae29ac558cefb3aa9bbeea03d4",
"status": "affected",
"versionType": "git"
}
]
},
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "affected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"net/tls/tls_device.c"
],
"versions": [
{
"version": "4.18",
"status": "affected"
},
{
"version": "0",
"lessThan": "4.18",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "5.10.273",
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "5.15.224",
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.1.187",
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.6.156",
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.12.108",
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.18.49",
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "7.1.13",
"lessThanOrEqual": "7.1.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "7.2.3",
"lessThanOrEqual": "7.2.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "7.3",
"lessThanOrEqual": "*",
"status": "unaffected",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"operator": "OR",
"negate": false,
"cpeMatch": [
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "4.18",
"versionEndExcluding": "5.10.273"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "4.18",
"versionEndExcluding": "5.15.224"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "4.18",
"versionEndExcluding": "6.1.187"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "4.18",
"versionEndExcluding": "6.6.156"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "4.18",
"versionEndExcluding": "6.12.108"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "4.18",
"versionEndExcluding": "6.18.49"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "4.18",
"versionEndExcluding": "7.1.13"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "4.18",
"versionEndExcluding": "7.2.3"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "4.18",
"versionEndExcluding": "7.3"
}
]
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]
}
],
"references": [
{
"url": "https://git.kernel.org/stable/c/bc09411a11b5a676c59ff8612c6873d014f6fb36"
},
{
"url": "https://git.kernel.org/stable/c/1fc6eb0c756b8be693b72e9e636ae5e236dcb6ee"
},
{
"url": "https://git.kernel.org/stable/c/03ced5da6120965d80ed56dbb7d78fa5c9128906"
},
{
"url": "https://git.kernel.org/stable/c/a832d7cb09da2a8e4e9734b4be14d3e76169d805"
},
{
"url": "https://git.kernel.org/stable/c/b7f10d4ff987bda038df90052cd4a1434a7412d4"
},
{
"url": "https://git.kernel.org/stable/c/fadbc1ed2a872a8649a44cf9e1cf9621fc58cd6e"
},
{
"url": "https://git.kernel.org/stable/c/cd7e875b89597f3498917af764758391338d1802"
},
{
"url": "https://git.kernel.org/stable/c/7e1208c135618358da5d7d6664874dc6e53c62fc"
},
{
"url": "https://git.kernel.org/stable/c/b17cf742eaad70ae29ac558cefb3aa9bbeea03d4"
}
],
"title": "tls: device: fix out-of-bounds write in tls_append_frag()",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
}
}
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