Tracker / CVE-2026-46300
CVE-2026-46300
In the Linux kernel, the following vulnerability has been resolved: net: skbuff: preserve shared-frag marker during coalescing skb_try_coalesce() can attach paged frags from @from to @to. If @from has SKBFL_SHARED_FRAG set, the resulting @to skb can contain the same externally-owned or page-cache-backed frags, but the shared-frag marker is currently lost. That breaks the invariant relied on by later in-place writers. In particular, ESP input checks skb_has_shared_frag() before deciding whether an uncloned nonlinear skb can skip skb_cow_data(). If TCP receive coalescing has moved shared frags into an unmarked skb, ESP can see skb_has_shared_frag() as false and decrypt in place over page-cache backed frags. Propagate SKBFL_SHARED_FRAG when skb_try_coalesce() transfers paged frags. The tailroom copy path does not need the marker because it copies bytes into @to's linear data rather than transferring frag descriptors.
Affected products and versions
| linux | linux_kernel |
|---|---|
| linux | linux_kernel · 3.9 → 5.10.257 |
| linux | linux_kernel · 5.11 → 5.15.208 |
| linux | linux_kernel · 5.16 → 6.1.174 |
| linux | linux_kernel · 6.13 → 6.18.33 |
| linux | linux_kernel · 6.19 → 7.0.10 |
| linux | linux_kernel · 6.2 → 6.6.141 |
| linux | linux_kernel · 6.7 → 6.12.91 |