In the Linux kernel, the following vulnerability has been resolved:
tls: fix use-after-free on failed backlog decryption
When the decrypt request goes to the backlog and crypto_aead_decrypt
returns -EBUSY, tls_do_decryption will wait until all async
decryptions have completed. If one of them fails, tls_do_decryption
will return -EBADMSG and tls_decrypt_sg jumps to the error path,
releasing all the pages. But the pages have been passed to the async
callback, and have already been released by tls_decrypt_done.
The only true async case is when crypto_aead_decrypt returns
-EINPROGRESS. With -EBUSY, we already waited so we can tell
tls_sw_recvmsg that the data is available for immediate copy, but we
need to notify tls_decrypt_sg (via the new ->async_done flag) that the
memory has already been released.
[
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "unaffected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"net/tls/tls_sw.c"
],
"versions": [
{
"version": "cd1bbca03f3c",
"lessThan": "f2b85a4cc763",
"status": "affected",
"versionType": "git"
},
{
"version": "13eca403876b",
"lessThan": "81be85353b0f",
"status": "affected",
"versionType": "git"
},
{
"version": "ab6397f072e5",
"lessThan": "1ac9fb84bc7e",
"status": "affected",
"versionType": "git"
},
{
"version": "859054147318",
"lessThan": "13114dc55430",
"status": "affected",
"versionType": "git"
}
]
},
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "unaffected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"net/tls/tls_sw.c"
],
"versions": [
{
"version": "6.6.18",
"lessThan": "6.6.21",
"status": "affected",
"versionType": "custom"
},
{
"version": "6.7.6",
"lessThan": "6.7.9",
"status": "affected",
"versionType": "custom"
}
]
}
]