| From bippy-5f407fcff5a0 Mon Sep 17 00:00:00 2001 |
| From: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
| To: <linux-cve-announce@vger.kernel.org> |
| Reply-to: <cve@kernel.org>, <linux-kernel@vger.kernel.org> |
| Subject: CVE-2024-49948: net: add more sanity checks to qdisc_pkt_len_init() |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| net: add more sanity checks to qdisc_pkt_len_init() |
| |
| One path takes care of SKB_GSO_DODGY, assuming |
| skb->len is bigger than hdr_len. |
| |
| virtio_net_hdr_to_skb() does not fully dissect TCP headers, |
| it only make sure it is at least 20 bytes. |
| |
| It is possible for an user to provide a malicious 'GSO' packet, |
| total length of 80 bytes. |
| |
| - 20 bytes of IPv4 header |
| - 60 bytes TCP header |
| - a small gso_size like 8 |
| |
| virtio_net_hdr_to_skb() would declare this packet as a normal |
| GSO packet, because it would see 40 bytes of payload, |
| bigger than gso_size. |
| |
| We need to make detect this case to not underflow |
| qdisc_skb_cb(skb)->pkt_len. |
| |
| The Linux kernel CVE team has assigned CVE-2024-49948 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 3.9 with commit 1def9238d4aa2146924994aa4b7dc861f03b9362 and fixed in 4.19.323 with commit d7d1a28f5dd57b4d83def876f8d7b4403bd37df9 |
| Issue introduced in 3.9 with commit 1def9238d4aa2146924994aa4b7dc861f03b9362 and fixed in 5.4.285 with commit 473426a1d53a68dd1e718e6cd00d57936993fa6c |
| Issue introduced in 3.9 with commit 1def9238d4aa2146924994aa4b7dc861f03b9362 and fixed in 5.10.227 with commit 566a931a1436d0e0ad13708ea55479b95426213c |
| Issue introduced in 3.9 with commit 1def9238d4aa2146924994aa4b7dc861f03b9362 and fixed in 5.15.168 with commit 2415f465730e48b6e38da1c7c097317bf5dd2d20 |
| Issue introduced in 3.9 with commit 1def9238d4aa2146924994aa4b7dc861f03b9362 and fixed in 6.1.113 with commit 27a8fabc54d2f960d47bdfbebf2bdc6e8a92a4c4 |
| Issue introduced in 3.9 with commit 1def9238d4aa2146924994aa4b7dc861f03b9362 and fixed in 6.6.55 with commit 9b0ee571d20a238a22722126abdfde61f1b2bdd0 |
| Issue introduced in 3.9 with commit 1def9238d4aa2146924994aa4b7dc861f03b9362 and fixed in 6.10.14 with commit ff1c3cadcf405ab37dd91418a62a7acecf3bc5e2 |
| Issue introduced in 3.9 with commit 1def9238d4aa2146924994aa4b7dc861f03b9362 and fixed in 6.11.3 with commit 1eebe602a8d8264a12e35e39d0645fa88dbbacdd |
| Issue introduced in 3.9 with commit 1def9238d4aa2146924994aa4b7dc861f03b9362 and fixed in 6.12 with commit ab9a9a9e9647392a19e7a885b08000e89c86b535 |
| |
| Please see https://www.kernel.org for a full list of currently supported |
| kernel versions by the kernel community. |
| |
| Unaffected versions might change over time as fixes are backported to |
| older supported kernel versions. The official CVE entry at |
| https://cve.org/CVERecord/?id=CVE-2024-49948 |
| will be updated if fixes are backported, please check that for the most |
| up to date information about this issue. |
| |
| |
| Affected files |
| ============== |
| |
| The file(s) affected by this issue are: |
| net/core/dev.c |
| |
| |
| Mitigation |
| ========== |
| |
| The Linux kernel CVE team recommends that you update to the latest |
| stable kernel version for this, and many other bugfixes. Individual |
| changes are never tested alone, but rather are part of a larger kernel |
| release. Cherry-picking individual commits is not recommended or |
| supported by the Linux kernel community at all. If however, updating to |
| the latest release is impossible, the individual changes to resolve this |
| issue can be found at these commits: |
| https://git.kernel.org/stable/c/d7d1a28f5dd57b4d83def876f8d7b4403bd37df9 |
| https://git.kernel.org/stable/c/473426a1d53a68dd1e718e6cd00d57936993fa6c |
| https://git.kernel.org/stable/c/566a931a1436d0e0ad13708ea55479b95426213c |
| https://git.kernel.org/stable/c/2415f465730e48b6e38da1c7c097317bf5dd2d20 |
| https://git.kernel.org/stable/c/27a8fabc54d2f960d47bdfbebf2bdc6e8a92a4c4 |
| https://git.kernel.org/stable/c/9b0ee571d20a238a22722126abdfde61f1b2bdd0 |
| https://git.kernel.org/stable/c/ff1c3cadcf405ab37dd91418a62a7acecf3bc5e2 |
| https://git.kernel.org/stable/c/1eebe602a8d8264a12e35e39d0645fa88dbbacdd |
| https://git.kernel.org/stable/c/ab9a9a9e9647392a19e7a885b08000e89c86b535 |
