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vuln-cve/data/2026/45xxx/CVE-2026-45866.json
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{
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"cveMetadata": {
"cveId": "CVE-2026-45866",
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"state": "PUBLISHED",
"assignerShortName": "Linux",
"dateReserved": "2026-05-13T15:03:33.080Z",
"datePublished": "2026-05-27T12:15:46.135Z",
"dateUpdated": "2026-05-27T12:15:46.135Z"
},
"containers": {
"cna": {
"providerMetadata": {
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux",
"dateUpdated": "2026-05-27T12:15:46.135Z"
},
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nserial: caif: fix use-after-free in caif_serial ldisc_close()\n\nThere is a use-after-free bug in caif_serial where handle_tx() may\naccess ser->tty after the tty has been freed.\n\nThe race condition occurs between ldisc_close() and packet transmission:\n\n CPU 0 (close) CPU 1 (xmit)\n ------------- ------------\n ldisc_close()\n tty_kref_put(ser->tty)\n [tty may be freed here]\n <-- race window -->\n caif_xmit()\n handle_tx()\n tty = ser->tty // dangling ptr\n tty->ops->write() // UAF!\n schedule_work()\n ser_release()\n unregister_netdevice()\n\nThe root cause is that tty_kref_put() is called in ldisc_close() while\nthe network device is still active and can receive packets.\n\nSince ser and tty have a 1:1 binding relationship with consistent\nlifecycles (ser is allocated in ldisc_open and freed in ser_release\nvia unregister_netdevice, and each ser binds exactly one tty), we can\nsafely defer the tty reference release to ser_release() where the\nnetwork device is unregistered.\n\nFix this by moving tty_kref_put() from ldisc_close() to ser_release(),\nafter unregister_netdevice(). This ensures the tty reference is held\nas long as the network device exists, preventing the UAF.\n\nNote: We save ser->tty before unregister_netdevice() because ser is\nembedded in netdev's private data and will be freed along with netdev\n(needs_free_netdev = true).\n\nHow to reproduce: Add mdelay(500) at the beginning of ldisc_close()\nto widen the race window, then run the reproducer program [1].\n\nNote: There is a separate deadloop issue in handle_tx() when using\nPORT_UNKNOWN serial ports (e.g., /dev/ttyS3 in QEMU without proper\nserial backend). This deadloop exists even without this patch,\nand is likely caused by inconsistency between uart_write_room() and\nuart_write() in serial core. It has been addressed in a separate\npatch [2].\n\nKASAN report:\n\n==================================================================\nBUG: KASAN: slab-use-after-free in handle_tx+0x5d1/0x620\nRead of size 1 at addr ffff8881131e1490 by task caif_uaf_trigge/9929\n\nCall Trace:\n <TASK>\n dump_stack_lvl+0x10e/0x1f0\n print_report+0xd0/0x630\n kasan_report+0xe4/0x120\n handle_tx+0x5d1/0x620\n dev_hard_start_xmit+0x9d/0x6c0\n __dev_queue_xmit+0x6e2/0x4410\n packet_xmit+0x243/0x360\n packet_sendmsg+0x26cf/0x5500\n __sys_sendto+0x4a3/0x520\n __x64_sys_sendto+0xe0/0x1c0\n do_syscall_64+0xc9/0xf80\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\nRIP: 0033:0x7f615df2c0d7\n\nAllocated by task 9930:\n\nFreed by task 64:\n\nLast potentially related work creation:\n\nThe buggy address belongs to the object at ffff8881131e1000\n which belongs to the cache kmalloc-cg-2k of size 2048\nThe buggy address is located 1168 bytes inside of\n freed 2048-byte region [ffff8881131e1000, ffff8881131e1800)\n\nThe buggy address belongs to the physical page:\npage_owner tracks the page as allocated\npage last free pid 9778 tgid 9778 stack trace:\n\nMemory state around the buggy address:\n ffff8881131e1380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb\n ffff8881131e1400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb\n>ffff8881131e1480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb\n ^\n ffff8881131e1500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb\n ffff8881131e1580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb\n==================================================================\n[1]: https://gist.github.com/mrpre/f683f244544f7b11e7fa87df9e6c2eeb\n[2]: https://lore.kernel.org/linux-serial/20260204074327.226165-1-jiayuan.chen@linux.dev/T/#u"
}
],
"affected": [
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "unaffected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"drivers/net/caif/caif_serial.c"
],
"versions": [
{
"version": "56e0ef527b184b3de2d7f88c6190812b2b2ac6bf",
"lessThan": "5e266ba8d330d3b8e5bc198f238cd8901826cfa1",
"status": "affected",
"versionType": "git"
},
{
"version": "56e0ef527b184b3de2d7f88c6190812b2b2ac6bf",
"lessThan": "d3c75db4e0460641dbcd274b40867e252d801da1",
"status": "affected",
"versionType": "git"
},
{
"version": "56e0ef527b184b3de2d7f88c6190812b2b2ac6bf",
"lessThan": "4e63d6f68544ae5269ac9735ae5b69b59b5b8725",
"status": "affected",
"versionType": "git"
},
{
"version": "56e0ef527b184b3de2d7f88c6190812b2b2ac6bf",
"lessThan": "331e2b7051635780edea248dd08ae2026c126f4a",
"status": "affected",
"versionType": "git"
},
{
"version": "56e0ef527b184b3de2d7f88c6190812b2b2ac6bf",
"lessThan": "52731ef4438155cea782fac74e547a327ab9e7c5",
"status": "affected",
"versionType": "git"
},
{
"version": "56e0ef527b184b3de2d7f88c6190812b2b2ac6bf",
"lessThan": "c8c197aaa56b25a2d54f3aa07e27e228d6c08546",
"status": "affected",
"versionType": "git"
},
{
"version": "56e0ef527b184b3de2d7f88c6190812b2b2ac6bf",
"lessThan": "40962f2bf8cdba63af23aec95ad3f49b689e58e2",
"status": "affected",
"versionType": "git"
},
{
"version": "56e0ef527b184b3de2d7f88c6190812b2b2ac6bf",
"lessThan": "308e7e4d0a846359685f40aade023aee7b27284c",
"status": "affected",
"versionType": "git"
}
]
},
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "affected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"drivers/net/caif/caif_serial.c"
],
"versions": [
{
"version": "3.11",
"status": "affected"
},
{
"version": "0",
"lessThan": "3.11",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "5.10.252",
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "5.15.202",
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.1.165",
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.6.128",
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.12.75",
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.18.14",
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.19.4",
"lessThanOrEqual": "6.19.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "7.0",
"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": "3.11",
"versionEndExcluding": "5.10.252"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "3.11",
"versionEndExcluding": "5.15.202"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "3.11",
"versionEndExcluding": "6.1.165"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "3.11",
"versionEndExcluding": "6.6.128"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "3.11",
"versionEndExcluding": "6.12.75"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "3.11",
"versionEndExcluding": "6.18.14"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "3.11",
"versionEndExcluding": "6.19.4"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "3.11",
"versionEndExcluding": "7.0"
}
]
}
]
}
],
"references": [
{
"url": "https://git.kernel.org/stable/c/5e266ba8d330d3b8e5bc198f238cd8901826cfa1"
},
{
"url": "https://git.kernel.org/stable/c/d3c75db4e0460641dbcd274b40867e252d801da1"
},
{
"url": "https://git.kernel.org/stable/c/4e63d6f68544ae5269ac9735ae5b69b59b5b8725"
},
{
"url": "https://git.kernel.org/stable/c/331e2b7051635780edea248dd08ae2026c126f4a"
},
{
"url": "https://git.kernel.org/stable/c/52731ef4438155cea782fac74e547a327ab9e7c5"
},
{
"url": "https://git.kernel.org/stable/c/c8c197aaa56b25a2d54f3aa07e27e228d6c08546"
},
{
"url": "https://git.kernel.org/stable/c/40962f2bf8cdba63af23aec95ad3f49b689e58e2"
},
{
"url": "https://git.kernel.org/stable/c/308e7e4d0a846359685f40aade023aee7b27284c"
}
],
"title": "serial: caif: fix use-after-free in caif_serial ldisc_close()",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
}
}
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