| From bippy-1.2.0 Mon Sep 17 00:00:00 2001 |
| From: Greg Kroah-Hartman <gregkh@kernel.org> |
| To: <linux-cve-announce@vger.kernel.org> |
| Reply-to: <cve@kernel.org>, <linux-kernel@vger.kernel.org> |
| Subject: CVE-2025-37749: net: ppp: Add bound checking for skb data on ppp_sync_txmung |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| net: ppp: Add bound checking for skb data on ppp_sync_txmung |
| |
| Ensure we have enough data in linear buffer from skb before accessing |
| initial bytes. This prevents potential out-of-bounds accesses |
| when processing short packets. |
| |
| When ppp_sync_txmung receives an incoming package with an empty |
| payload: |
| (remote) gef➤ p *(struct pppoe_hdr *) (skb->head + skb->network_header) |
| $18 = { |
| type = 0x1, |
| ver = 0x1, |
| code = 0x0, |
| sid = 0x2, |
| length = 0x0, |
| tag = 0xffff8880371cdb96 |
| } |
| |
| from the skb struct (trimmed) |
| tail = 0x16, |
| end = 0x140, |
| head = 0xffff88803346f400 "4", |
| data = 0xffff88803346f416 ":\377", |
| truesize = 0x380, |
| len = 0x0, |
| data_len = 0x0, |
| mac_len = 0xe, |
| hdr_len = 0x0, |
| |
| it is not safe to access data[2]. |
| |
| [pabeni@redhat.com: fixed subj typo] |
| |
| The Linux kernel CVE team has assigned CVE-2025-37749 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 2.6.12 with commit 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and fixed in 5.4.293 with commit 529401c8f12ecc35f9ea5d946d5a5596cf172b48 |
| Issue introduced in 2.6.12 with commit 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and fixed in 5.10.237 with commit de5a4f0cba58625e88b7bebd88f780c8c0150997 |
| Issue introduced in 2.6.12 with commit 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and fixed in 5.15.181 with commit 99aa698dec342a07125d733e39aab4394b3b7e05 |
| Issue introduced in 2.6.12 with commit 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and fixed in 6.1.135 with commit b78f2b458f56a5a4d976c8e01c43dbf58d3ea2ca |
| Issue introduced in 2.6.12 with commit 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and fixed in 6.6.88 with commit fbaffe8bccf148ece8ad67eb5d7aa852cabf59c8 |
| Issue introduced in 2.6.12 with commit 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and fixed in 6.12.24 with commit b4c836d33ca888695b2f2665f948bc1b34fbd533 |
| Issue introduced in 2.6.12 with commit 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and fixed in 6.13.12 with commit 1f6eb9fa87a781d5370c0de7794ae242f1a95ee5 |
| Issue introduced in 2.6.12 with commit 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and fixed in 6.14.3 with commit 6e8a6bf43cea4347121ab21bb1ed8d7bef7e732e |
| Issue introduced in 2.6.12 with commit 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and fixed in 6.15 with commit aabc6596ffb377c4c9c8f335124b92ea282c9821 |
| |
| 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-2025-37749 |
| 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: |
| drivers/net/ppp/ppp_synctty.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/529401c8f12ecc35f9ea5d946d5a5596cf172b48 |
| https://git.kernel.org/stable/c/de5a4f0cba58625e88b7bebd88f780c8c0150997 |
| https://git.kernel.org/stable/c/99aa698dec342a07125d733e39aab4394b3b7e05 |
| https://git.kernel.org/stable/c/b78f2b458f56a5a4d976c8e01c43dbf58d3ea2ca |
| https://git.kernel.org/stable/c/fbaffe8bccf148ece8ad67eb5d7aa852cabf59c8 |
| https://git.kernel.org/stable/c/b4c836d33ca888695b2f2665f948bc1b34fbd533 |
| https://git.kernel.org/stable/c/1f6eb9fa87a781d5370c0de7794ae242f1a95ee5 |
| https://git.kernel.org/stable/c/6e8a6bf43cea4347121ab21bb1ed8d7bef7e732e |
| https://git.kernel.org/stable/c/aabc6596ffb377c4c9c8f335124b92ea282c9821 |
