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.
Product status
b3f9b92a6ec1a9a5e4b4b36e484f2f62cc73277c (git) before 9ca6a040f76c0b149293e430dabab446f3fc8ab7
b3f9b92a6ec1a9a5e4b4b36e484f2f62cc73277c (git) before 87a35a36742df328d0badf4fbc2e56061c15846c
b3f9b92a6ec1a9a5e4b4b36e484f2f62cc73277c (git) before 0b21e9cd4559102da798bdcba453b64ecd7be7ee
b3f9b92a6ec1a9a5e4b4b36e484f2f62cc73277c (git) before 1d8b354eafb8876d8bdb1bef69c7d2438aacfbe8
b3f9b92a6ec1a9a5e4b4b36e484f2f62cc73277c (git) before 85c1c86a67e09143aa464e9bf09c397816772348
b3f9b92a6ec1a9a5e4b4b36e484f2f62cc73277c (git) before 631fc8ab5beb9e0ec8651fb9875b9a968e7b4ae4
b3f9b92a6ec1a9a5e4b4b36e484f2f62cc73277c (git) before 33a5bac5f14772730d2caf632ae97b6c2ee95044
b3f9b92a6ec1a9a5e4b4b36e484f2f62cc73277c (git) before 4844123fe0b853a4982c02666cb3fd863d701d50
2.6.15
Any version before 2.6.15
5.4.299 (semver)
5.10.243 (semver)
5.15.192 (semver)
6.1.151 (semver)
6.6.105 (semver)
6.12.46 (semver)
6.16.6 (semver)
6.17 (original_commit_for_fix)
References
lists.debian.org/debian-lts-announce/2025/10/msg00008.html
lists.debian.org/debian-lts-announce/2025/10/msg00007.html
git.kernel.org/...c/9ca6a040f76c0b149293e430dabab446f3fc8ab7
git.kernel.org/...c/87a35a36742df328d0badf4fbc2e56061c15846c
git.kernel.org/...c/0b21e9cd4559102da798bdcba453b64ecd7be7ee
git.kernel.org/...c/1d8b354eafb8876d8bdb1bef69c7d2438aacfbe8
git.kernel.org/...c/85c1c86a67e09143aa464e9bf09c397816772348
git.kernel.org/...c/631fc8ab5beb9e0ec8651fb9875b9a968e7b4ae4
git.kernel.org/...c/33a5bac5f14772730d2caf632ae97b6c2ee95044
git.kernel.org/...c/4844123fe0b853a4982c02666cb3fd863d701d50
