Answer in brief
CVE-2026-98839 records a Unknown severity vulnerability in vt: selection: Fix unsigned underflow and slab-out-of-bounds read in paste_selection(). The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=e8c75a30a23c6ba63f4ef6895cbf41fd42f21aa2 <037d7e3ca5c593092f4b0d471eb869a85cbddde0 || >=e8c75a30a23c6ba63f4ef6895cbf41fd42f21aa2 <619c6d7dd76fff15a9714fbf02ce299b737f01a2 || >=e8c75a30a23c6ba63f4ef6895cbf41fd42f21aa2 <39495ef5d6f8019e62d65807f217a7ca8232727a || 54c522782fd11a720f959ee9cb5a15bb9580343d || 05c508edc9d0b44e4706d3c2cf14ee12aac210d2 || e5be0e24ffc7f5783a3864b5b958088ed15be9e8 || a4719f6d07b2c63223f7452c435c5f578f105cfe || b4492f1e7456bd162714c0ec2815c2749d930844 || 9a9c13ad21a8220cb70c9807a920f43520515f94 || 8c368d36878e2fc99285279fc5e14b3d3cb8947c || >=3.16.83 <3.17 || >=4.4.216 <4.5 || >=4.9.216 <4.10 || >=4.14.173 <4.15 || >=4.19.109 <4.20 || >=5.4.25 <5.5 || >=5.5.9 <5.6 | 037d7e3ca5c593092f4b0d471eb869a85cbddde0, 619c6d7dd76fff15a9714fbf02ce299b737f01a2, 39495ef5d6f8019e62d65807f217a7ca8232727a, 3.17, 4.5, 4.10, 4.15, 4.20, 5.5, 5.6 |
| Linux/Linuxgeneric | 5.6 | Not reported |
Published upstream
Oct 18, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 18, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Oct 18, 2026
In the Linux kernel, the following vulnerability has been resolved: vt: selection: Fix unsigned underflow and slab-out-of-bounds read in paste_selection() In paste_selection(), the loop copies min_t(unsigned int, vc_sel.buf_len - pasted,tty->receive_room) bytes per iteration into tty_ldisc_receive_buf() and increments pasted += count. Because the selection mutex (vc_sel.lock) is dropped inside the loop Whenever the line discipline buffer fills up and paste_selection() sleeps on tty->write_wait, a concurrent TIOCLINUX (TIOCL_SETSEL) ioctl can replace vc_sel.buffer with a shorter selection and reduce vc_sel.buf_len below pasted. When paste_selection() resumes, vc_sel.buf_len - pasted underflows as an unsigned integer to a large positive value, causing tty_ldisc_receive_buf(ld, vc_sel.buffer + pasted, NULL, count) to read up to 4094 bytes out-of-bounds past the newly allocated vc_sel.buffer. Fix this by terminating the loop when pasted >= vc_sel.buf_len. Kernel stack trace (Linux 7.3.0-rc3): ================================================================== BUG: KASAN: slab-out-of-bounds in n_tty_receive_buf_common+0xa01/0x1650 Read of size 4094 at addr ffff888101c58010 by task kworker/u17:1/65 Workqueue: events_unbound flush_to_ldisc Call Trace: <TASK> dump_stack_lvl+0x70/0xa0 print_report+0x153/0x4c6 kasan_report+0xf1/0x120 kasan_check_range+0x11c/0x200 __asan_memcpy+0x29/0x70 n_tty_receive_buf_common+0xa01/0x1650 tty_ldisc_receive_buf+0x66/0x110 tty_port_default_receive_buf+0x6b/0xb0 flush_to_ldisc+0x1b4/0x410 process_one_work+0x6ff/0x1110 worker_thread+0x4a8/0xb70 kthread+0x307/0x3e0 ret_from_fork+0x3ed/0x680 </TASK> ==================================================================
Quoted source text, attributed separately from HOL analysis.