{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-98839", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-25T10:25:14.373Z", "datePublished": "2026-10-18T15:50:11.869Z", "dateUpdated": "2026-10-19T09:26:31.558Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T09:26:31.558Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nvt: selection: Fix unsigned underflow and slab-out-of-bounds read in paste_selection()\n\nIn paste_selection(), the loop copies min_t(unsigned int,\nvc_sel.buf_len - pasted,tty->receive_room) bytes per iteration into\ntty_ldisc_receive_buf() and increments pasted += count.\n\nBecause the selection mutex (vc_sel.lock) is dropped inside the loop\nWhenever the line discipline buffer fills up and paste_selection()\nsleeps on tty->write_wait, a concurrent TIOCLINUX (TIOCL_SETSEL) ioctl\ncan replace vc_sel.buffer with a shorter selection and reduce\nvc_sel.buf_len below pasted.\n\nWhen paste_selection() resumes, vc_sel.buf_len - pasted underflows as an\nunsigned integer to a large positive value, causing\ntty_ldisc_receive_buf(ld, vc_sel.buffer + pasted, NULL, count) to read\nup to 4094 bytes out-of-bounds past the newly allocated vc_sel.buffer.\n\nFix this by terminating the loop when pasted >= vc_sel.buf_len.\n\nKernel stack trace (Linux 7.3.0-rc3):\n ==================================================================\n BUG: KASAN: slab-out-of-bounds in n_tty_receive_buf_common+0xa01/0x1650\n Read of size 4094 at addr ffff888101c58010 by task kworker/u17:1/65\n Workqueue: events_unbound flush_to_ldisc\n Call Trace:\n \n dump_stack_lvl+0x70/0xa0\n print_report+0x153/0x4c6\n kasan_report+0xf1/0x120\n kasan_check_range+0x11c/0x200\n __asan_memcpy+0x29/0x70\n n_tty_receive_buf_common+0xa01/0x1650\n tty_ldisc_receive_buf+0x66/0x110\n tty_port_default_receive_buf+0x6b/0xb0\n flush_to_ldisc+0x1b4/0x410\n process_one_work+0x6ff/0x1110\n worker_thread+0x4a8/0xb70\n kthread+0x307/0x3e0\n ret_from_fork+0x3ed/0x680\n \n ==================================================================" } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/tty/vt/selection.c" ], "versions": [ { "version": "e8c75a30a23c6ba63f4ef6895cbf41fd42f21aa2", "lessThan": "037d7e3ca5c593092f4b0d471eb869a85cbddde0", "status": "affected", "versionType": "git" }, { "version": "e8c75a30a23c6ba63f4ef6895cbf41fd42f21aa2", "lessThan": "619c6d7dd76fff15a9714fbf02ce299b737f01a2", "status": "affected", "versionType": "git" }, { "version": "e8c75a30a23c6ba63f4ef6895cbf41fd42f21aa2", "lessThan": "39495ef5d6f8019e62d65807f217a7ca8232727a", "status": "affected", "versionType": "git" }, { "version": "54c522782fd11a720f959ee9cb5a15bb9580343d", "status": "affected", "versionType": "git" }, { "version": "05c508edc9d0b44e4706d3c2cf14ee12aac210d2", "status": "affected", "versionType": "git" }, { "version": "e5be0e24ffc7f5783a3864b5b958088ed15be9e8", "status": "affected", "versionType": "git" }, { "version": "a4719f6d07b2c63223f7452c435c5f578f105cfe", "status": "affected", "versionType": "git" }, { "version": "b4492f1e7456bd162714c0ec2815c2749d930844", "status": "affected", "versionType": "git" }, { "version": "9a9c13ad21a8220cb70c9807a920f43520515f94", "status": "affected", "versionType": "git" }, { "version": "8c368d36878e2fc99285279fc5e14b3d3cb8947c", "status": "affected", "versionType": "git" }, { "version": "3.16.83", "lessThan": "3.17", "status": "affected", "versionType": "semver" }, { "version": "4.4.216", "lessThan": "4.5", "status": "affected", "versionType": "semver" }, { "version": "4.9.216", "lessThan": "4.10", "status": "affected", "versionType": "semver" }, { "version": "4.14.173", "lessThan": "4.15", "status": "affected", "versionType": "semver" }, { "version": "4.19.109", "lessThan": "4.20", "status": "affected", "versionType": "semver" }, { "version": "5.4.25", "lessThan": "5.5", "status": "affected", "versionType": "semver" }, { "version": "5.5.9", "lessThan": "5.6", "status": "affected", "versionType": "semver" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/tty/vt/selection.c" ], "versions": [ { "version": "5.6", "status": "affected" }, { "version": "0", "lessThan": "5.6", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.56", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2.10", "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": "5.6", "versionEndExcluding": "6.18.56" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.6", "versionEndExcluding": "7.2.10" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.6", "versionEndExcluding": "7.3" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.16.83" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.4.216" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.9.216" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.14.173" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.19.109" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.4.25" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.5.9" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/037d7e3ca5c593092f4b0d471eb869a85cbddde0" }, { "url": "https://git.kernel.org/stable/c/619c6d7dd76fff15a9714fbf02ce299b737f01a2" }, { "url": "https://git.kernel.org/stable/c/39495ef5d6f8019e62d65807f217a7ca8232727a" } ], "title": "vt: selection: Fix unsigned underflow and slab-out-of-bounds read in paste_selection()", "x_generator": { "engine": "bippy-1.2.0" } } } }