Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_conntrack_irc: fix parse_dcc() off-by-one OOB read parse_dcc() treats data_end as an inclusive end pointer, but its only caller passes data_limit = ib_ptr + datalen, which points one past the last valid byte. The newline search loop iterates while tmp <= data_end, so when no newline is present, *tmp is read at tmp == data_end, one byte beyond the region filled by skb_header_pointer(). irc_buffer is kmalloc'd as MAX_SEARCH_SIZE + 1 bytes and datalen is capped at MAX_SEARCH_SIZE, so the stray read does not fault. The byte is uninitialized or stale; if it contains an ASCII digit, simple_strtoul will consume it and produce a wrong DCC IP or port in the conntrack expectation. The extra allocation byte is also a fragile guard: if the cap or allocation size changes, this becomes a real out-of-bounds read. Change the loop and its post-loop check to use strict less-than, consistent with the caller's exclusive-end convention. Update the function comment accordingly.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before abb8c32b88ea3f46beb68c34fe9a3ac8ed664e7e; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 437e0a3854b3a44ec15afa9ab88ec215adf3a2fd; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 910c33e4a8c046c3cc1fa5a465a4d41a1bb398f1; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 2b70f61f569bb29acb380e6f616a1bbdee15668f; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 2393f0bd7a467ad475598f3a5b9de27ca36e3037; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before aff589556ed772cb1c0c2d7b4d91ec45c0c39416; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before eeef3b81f449560653662df2dde6f6fe247c5365; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before ef6400ca25a13fd6dedbe8ef4a1d0979bbbfe88a |
| Linux / Linux | affected 2.6.12; unaffected 0 before 2.6.12; unaffected 5.10.261 through 5.10.*; unaffected 5.15.212 through 5.15.*; unaffected 6.1.178 through 6.1.*; unaffected 6.6.145 through 6.6.*; unaffected 6.12.97 through 6.12.*; unaffected 6.18.40 through 6.18.*; unaffected 7.1.5 through 7.1.*; unaffected 7.2 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/abb8c32b88ea3f46beb68c34fe9a3ac8ed664e7e
- https://git.kernel.org/stable/c/437e0a3854b3a44ec15afa9ab88ec215adf3a2fd
- https://git.kernel.org/stable/c/910c33e4a8c046c3cc1fa5a465a4d41a1bb398f1
- https://git.kernel.org/stable/c/2b70f61f569bb29acb380e6f616a1bbdee15668f
- https://git.kernel.org/stable/c/2393f0bd7a467ad475598f3a5b9de27ca36e3037
- https://git.kernel.org/stable/c/aff589556ed772cb1c0c2d7b4d91ec45c0c39416
- https://git.kernel.org/stable/c/eeef3b81f449560653662df2dde6f6fe247c5365
- https://git.kernel.org/stable/c/ef6400ca25a13fd6dedbe8ef4a1d0979bbbfe88a
ADP enrichment
No English description supplied.
No references supplied.