| From bippy-7c5fe7eed585 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-2025-21638: sctp: sysctl: auth_enable: avoid using current->nsproxy |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| sctp: sysctl: auth_enable: avoid using current->nsproxy |
| |
| As mentioned in a previous commit of this series, using the 'net' |
| structure via 'current' is not recommended for different reasons: |
| |
| - Inconsistency: getting info from the reader's/writer's netns vs only |
| from the opener's netns. |
| |
| - current->nsproxy can be NULL in some cases, resulting in an 'Oops' |
| (null-ptr-deref), e.g. when the current task is exiting, as spotted by |
| syzbot [1] using acct(2). |
| |
| The 'net' structure can be obtained from the table->data using |
| container_of(). |
| |
| Note that table->data could also be used directly, but that would |
| increase the size of this fix, while 'sctp.ctl_sock' still needs to be |
| retrieved from 'net' structure. |
| |
| The Linux kernel CVE team has assigned CVE-2025-21638 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 3.15 with commit b14878ccb7fac0242db82720b784ab62c467c0dc and fixed in 5.4.292 with commit cf387cdebfaebae228dfba162f94c567a67610c3 |
| Issue introduced in 3.15 with commit b14878ccb7fac0242db82720b784ab62c467c0dc and fixed in 5.10.234 with commit dc583e7e5f8515ca489c0df28e4362a70eade382 |
| Issue introduced in 3.15 with commit b14878ccb7fac0242db82720b784ab62c467c0dc and fixed in 5.15.177 with commit bd2a2939423566c654545fa3e96a656662a0af9e |
| Issue introduced in 3.15 with commit b14878ccb7fac0242db82720b784ab62c467c0dc and fixed in 6.1.125 with commit 1b67030d39f2b00f94ac1f0af11ba6657589e4d3 |
| Issue introduced in 3.15 with commit b14878ccb7fac0242db82720b784ab62c467c0dc and fixed in 6.6.72 with commit 7ec30c54f339c640aa7e49d7e9f7bbed6bd42bf6 |
| Issue introduced in 3.15 with commit b14878ccb7fac0242db82720b784ab62c467c0dc and fixed in 6.12.10 with commit c184bc621e3cef03ac9ba81a50dda2dae6a21d36 |
| Issue introduced in 3.15 with commit b14878ccb7fac0242db82720b784ab62c467c0dc and fixed in 6.13 with commit 15649fd5415eda664ef35780c2013adeb5d9c695 |
| Issue introduced in 3.10.41 with commit e5eae4a0511241959498b180fa0df0d4f1b11b9c |
| Issue introduced in 3.12.21 with commit 88830f227a1f96e44d82ddfcb0cc81d517ec6dd8 |
| Issue introduced in 3.14.5 with commit 3938b0336a93fa5faa242dc9e5823ac69df9e066 |
| |
| 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-2025-21638 |
| 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/sctp/sysctl.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/cf387cdebfaebae228dfba162f94c567a67610c3 |
| https://git.kernel.org/stable/c/dc583e7e5f8515ca489c0df28e4362a70eade382 |
| https://git.kernel.org/stable/c/bd2a2939423566c654545fa3e96a656662a0af9e |
| https://git.kernel.org/stable/c/1b67030d39f2b00f94ac1f0af11ba6657589e4d3 |
| https://git.kernel.org/stable/c/7ec30c54f339c640aa7e49d7e9f7bbed6bd42bf6 |
| https://git.kernel.org/stable/c/c184bc621e3cef03ac9ba81a50dda2dae6a21d36 |
| https://git.kernel.org/stable/c/15649fd5415eda664ef35780c2013adeb5d9c695 |
