| 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-2024-26739: net/sched: act_mirred: don't override retval if we already lost the skb |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| net/sched: act_mirred: don't override retval if we already lost the skb |
| |
| If we're redirecting the skb, and haven't called tcf_mirred_forward(), |
| yet, we need to tell the core to drop the skb by setting the retcode |
| to SHOT. If we have called tcf_mirred_forward(), however, the skb |
| is out of our hands and returning SHOT will lead to UaF. |
| |
| Move the retval override to the error path which actually need it. |
| |
| The Linux kernel CVE team has assigned CVE-2024-26739 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 4.19 with commit e5cf1baf92cb785b90390db1c624948e70c8b8bd and fixed in 5.10.238 with commit 0117fe0a4615a7c8d30d6ebcbf87332fbe63e6fd |
| Issue introduced in 4.19 with commit e5cf1baf92cb785b90390db1c624948e70c8b8bd and fixed in 5.15.182 with commit 9d3ef89b6a5e9f2e940de2cef3d543be0be8dec5 |
| Issue introduced in 4.19 with commit e5cf1baf92cb785b90390db1c624948e70c8b8bd and fixed in 6.1.136 with commit e873e8f7d03a2ee5b77fb1a305c782fed98e2754 |
| Issue introduced in 4.19 with commit e5cf1baf92cb785b90390db1c624948e70c8b8bd and fixed in 6.6.19 with commit 28cdbbd38a4413b8eff53399b3f872fd4e80db9d |
| Issue introduced in 4.19 with commit e5cf1baf92cb785b90390db1c624948e70c8b8bd and fixed in 6.7.7 with commit f4e294bbdca8ac8757db436fc82214f3882fc7e7 |
| Issue introduced in 4.19 with commit e5cf1baf92cb785b90390db1c624948e70c8b8bd and fixed in 6.8 with commit 166c2c8a6a4dc2e4ceba9e10cfe81c3e469e3210 |
| |
| 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-2024-26739 |
| 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/sched/act_mirred.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/0117fe0a4615a7c8d30d6ebcbf87332fbe63e6fd |
| https://git.kernel.org/stable/c/9d3ef89b6a5e9f2e940de2cef3d543be0be8dec5 |
| https://git.kernel.org/stable/c/e873e8f7d03a2ee5b77fb1a305c782fed98e2754 |
| https://git.kernel.org/stable/c/28cdbbd38a4413b8eff53399b3f872fd4e80db9d |
| https://git.kernel.org/stable/c/f4e294bbdca8ac8757db436fc82214f3882fc7e7 |
| https://git.kernel.org/stable/c/166c2c8a6a4dc2e4ceba9e10cfe81c3e469e3210 |
