Answer in brief
CVE-2026-98287 records a Unknown severity vulnerability in pppoatm: ensure a writable skb header and linear data. 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 | >=4cf476ced45d7f12df30a68e833b263e7a2202d1 <208ccc4d08b1897451e9ba01c016bf93ff107966 || >=4cf476ced45d7f12df30a68e833b263e7a2202d1 <e6cd1bba7d113c15c00ac63671213a096fe4d686 || >=4cf476ced45d7f12df30a68e833b263e7a2202d1 <ffc448eb54f5ba80d4212c1e870cdb92b0f709fa || >=4cf476ced45d7f12df30a68e833b263e7a2202d1 <8e66c5969acd859ba72fb0a7fa895623fc1b3769 || >=4cf476ced45d7f12df30a68e833b263e7a2202d1 <e2f5529b0016db7d34f411408607f5cf395a542e || >=4cf476ced45d7f12df30a68e833b263e7a2202d1 <30992fe39e65589ed8e000425e088fa74994b811 || >=4cf476ced45d7f12df30a68e833b263e7a2202d1 <ecc7253683a3c55caa868ce0ee530fcb0044bd3c | 208ccc4d08b1897451e9ba01c016bf93ff107966, e6cd1bba7d113c15c00ac63671213a096fe4d686, ffc448eb54f5ba80d4212c1e870cdb92b0f709fa, 8e66c5969acd859ba72fb0a7fa895623fc1b3769, e2f5529b0016db7d34f411408607f5cf395a542e, 30992fe39e65589ed8e000425e088fa74994b811, ecc7253683a3c55caa868ce0ee530fcb0044bd3c |
| Linux/Linuxgeneric | 5.11 | Not reported |
Published upstream
Oct 6, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 6, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Oct 6, 2026
In the Linux kernel, the following vulnerability has been resolved: pppoatm: ensure a writable skb header and linear data In pppoatm_send(), LLC encapsulation checks whether there is sufficient headroom for the 4-byte LLC header, but does not ensure that the skb header is writable. Normal transmit packets passing through ppp_start_xmit() have their header unshared via skb_cow_head(). However, packets can also reach pppoatm_send() via PPP channel bridging (PPPIOCBRIDGECHAN) without going through ppp_start_xmit(). Use skb_cow_head() to ensure both sufficient headroom and a writable header before pushing the LLC header. While at it: - Call pskb_may_pull(skb, 1) before inspecting skb->data[0] to prevent out-of-bounds reads on zero-length or non-linear frames (e.g. from bridging). - Defer SC_COMP_PROT protocol compression until after pppoatm_may_send() succeeds. This eliminates the temporary skb allocation on admission failure and completely removes the fragile "undo" heuristic at the nospace label, avoiding any risk of reading uninitialized headroom or performing an unbalanced skb_push().
Quoted source text, attributed separately from HOL analysis.