CVE-2026-98239
CVE.org · Published
- Record status
- Published
- Identifier year (not publication year)
- 2026
- Source publication
- Source updated
- Imported by cveboard
- Source snapshot
- cve_2026-10-24_midnight_baseline ·
CNA source text (English)
net: lan743x: fix RX checksum use-after-free
In the Linux kernel, the following vulnerability has been resolved: net: lan743x: fix RX checksum use-after-free lan743x_rx_process_buffer() adds each non-first receive buffer to the head skb's frag_list. On the last descriptor, lan743x_rx_trim_skb() linearizes the head and frees the fragment skb metadata. The checksum-success path then writes ip_summed through the local skb pointer, which still points to the final fragment. This causes a use-after-free write when a packet spans more than one receive buffer. Set ip_summed on the surviving head skb instead. Multi-buffer receive can occur after a live MTU increase because existing ring entries keep their old buffer size until they are replenished. A KUnit test invoking lan743x_rx_process_buffer() with a two-buffer packet produced a one-byte KASAN use-after-free write before this change. The same test passed after the change. The driver object also builds with W=1. This was not tested on physical LAN743x hardware.
Scoped product and version facts
Fix information unknown; no fixed version is derived here. Missing information does not prove that no fix exists.
Exploitation unknown; this catalogue does not assess exploitation.
Linux
- Vendor
- Linux
- Product
- Linux
- Platforms
- Unknown
- Default status
unaffected
| Version (version) | Status (status) | Version scheme (versionType) | Exclusive end (lessThan) | Inclusive end (lessThanOrEqual) | Status changes (at → status) |
|---|---|---|---|---|---|
| cd6910501cfd9a3bdff2f5fc33c9f3cf165ca54a | affected | git | 0e52886c4324c9897c2c62f92be3dc8316cee67e | Unavailable | None listed |
| cd6910501cfd9a3bdff2f5fc33c9f3cf165ca54a | affected | git | a58024835c704419bb46d2a34e5223f65605f958 | Unavailable | None listed |
| cd6910501cfd9a3bdff2f5fc33c9f3cf165ca54a | affected | git | 6fe5c3a2503983abb431d93faeadfc7f5e6a7e33 | Unavailable | None listed |
| cd6910501cfd9a3bdff2f5fc33c9f3cf165ca54a | affected | git | 5c216bfa9fb7b36804485e67975e9c98055b31ef | Unavailable | None listed |
| cd6910501cfd9a3bdff2f5fc33c9f3cf165ca54a | affected | git | 161a403c8625e152de03d1da22bbf9cda6dc9f9f | Unavailable | None listed |
| cd6910501cfd9a3bdff2f5fc33c9f3cf165ca54a | affected | git | a9ce4053dc945c5372dedba5017ee675b30dc0c5 | Unavailable | None listed |
Linux
- Vendor
- Linux
- Product
- Linux
- Platforms
- Unknown
- Default status
affected
| Version (version) | Status (status) | Version scheme (versionType) | Exclusive end (lessThan) | Inclusive end (lessThanOrEqual) | Status changes (at → status) |
|---|---|---|---|---|---|
| 6.1 | affected | Unavailable | Unavailable | Unavailable | None listed |
| 0 | unaffected | semver | 6.1 | Unavailable | None listed |
| 6.1.189 | unaffected | semver | Unavailable | 6.1.* | None listed |
| 6.6.158 | unaffected | semver | Unavailable | 6.6.* | None listed |
| 6.12.112 | unaffected | semver | Unavailable | 6.12.* | None listed |
| 6.18.54 | unaffected | semver | Unavailable | 6.18.* | None listed |
| 7.2.8 | unaffected | semver | Unavailable | 7.2.* | None listed |
| 7.3 | unaffected | original_commit_for_fix | Unavailable | * | None listed |