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CVE-2025-39847 ppp: fix memory leak in pad_compress_skb
Description
In the Linux kernel, the following vulnerability has been resolved: ppp: fix memory leak in pad_compress_skb If alloc_skb() fails in pad_compress_skb(), it returns NULL without releasing the old skb. The caller does: skb = pad_compress_skb(ppp, skb); if (!skb) goto drop; drop: kfree_skb(skb); When pad_compress_skb() returns NULL, the reference to the old skb is lost and kfree_skb(skb) ends up doing nothing, leading to a memory leak. Align pad_compress_skb() semantics with realloc(): only free the old skb if allocation and compression succeed. At the call site, use the new_skb variable so the original skb is not lost when pad_compress_skb() fails.
Affected products and versions
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux 6.17 | earliest → < 6.17 | 6.17 |
| Linux 6.16 | earliest → < 6.16.6 | 6.16.6 |
| Linux 6.12 | earliest → < 6.12.46 | 6.12.46 |
| Linux 6.6 | earliest → < 6.6.105 | 6.6.105 |
| Linux 6.1 | earliest → < 6.1.151 | 6.1.151 |
| Linux 5.15 | earliest → < 5.15.192 | 5.15.192 |
| Linux 5.10 | earliest → < 5.10.243 | 5.10.243 |
| Linux 5.4 | earliest → < 5.4.299 | 5.4.299 |
| Linux | 2.6.15 | No fix stated |
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| Product | Affected versions | Fixed in |
|---|---|---|
| SIMATIC CN 4100 5.0 | earliest → < 5.0 | 5.0 |
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