| 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-2024-40996: bpf: Avoid splat in pskb_pull_reason |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| bpf: Avoid splat in pskb_pull_reason |
| |
| syzkaller builds (CONFIG_DEBUG_NET=y) frequently trigger a debug |
| hint in pskb_may_pull. |
| |
| We'd like to retain this debug check because it might hint at integer |
| overflows and other issues (kernel code should pull headers, not huge |
| value). |
| |
| In bpf case, this splat isn't interesting at all: such (nonsensical) |
| bpf programs are typically generated by a fuzzer anyway. |
| |
| Do what Eric suggested and suppress such warning. |
| |
| For CONFIG_DEBUG_NET=n we don't need the extra check because |
| pskb_may_pull will do the right thing: return an error without the |
| WARN() backtrace. |
| |
| The Linux kernel CVE team has assigned CVE-2024-40996 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 6.1.86 with commit 8af60bb2b215f478b886f1d6d302fefa7f0b917d and fixed in 6.1.96 with commit dacc15e9cb248d19e5fc63c54bef0b9b55007761 |
| Issue introduced in 6.6.27 with commit 1b2b26595bb09febf14c5444c873ac4ec90a5a77 and fixed in 6.6.36 with commit 7f9644782c559635bd676c12c59389a34ed7c866 |
| Issue introduced in 6.9 with commit 219eee9c0d16f1b754a8b85275854ab17df0850a and fixed in 6.9.7 with commit 5e90258303a358e88737afb5048bee9113beea3a |
| Issue introduced in 6.9 with commit 219eee9c0d16f1b754a8b85275854ab17df0850a and fixed in 6.10 with commit 2bbe3e5a2f4ef69d13be54f1cf895b4658287080 |
| Issue introduced in 6.8.6 with commit fff05b2b004d9a8a2416d08647f3dc9068e357c8 |
| |
| 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-2024-40996 |
| 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/filter.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/dacc15e9cb248d19e5fc63c54bef0b9b55007761 |
| https://git.kernel.org/stable/c/7f9644782c559635bd676c12c59389a34ed7c866 |
| https://git.kernel.org/stable/c/5e90258303a358e88737afb5048bee9113beea3a |
| https://git.kernel.org/stable/c/2bbe3e5a2f4ef69d13be54f1cf895b4658287080 |
