| 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-2025-38637: net_sched: skbprio: Remove overly strict queue assertions |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| net_sched: skbprio: Remove overly strict queue assertions |
| |
| In the current implementation, skbprio enqueue/dequeue contains an assertion |
| that fails under certain conditions when SKBPRIO is used as a child qdisc under |
| TBF with specific parameters. The failure occurs because TBF sometimes peeks at |
| packets in the child qdisc without actually dequeuing them when tokens are |
| unavailable. |
| |
| This peek operation creates a discrepancy between the parent and child qdisc |
| queue length counters. When TBF later receives a high-priority packet, |
| SKBPRIO's queue length may show a different value than what's reflected in its |
| internal priority queue tracking, triggering the assertion. |
| |
| The fix removes this overly strict assertions in SKBPRIO, they are not |
| necessary at all. |
| |
| The Linux kernel CVE team has assigned CVE-2025-38637 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 4.19 with commit aea5f654e6b78a0c976f7a25950155932c77a53f and fixed in 5.4.292 with commit 7abc8318ce0712182bf0783dcfdd9a6a8331160e |
| Issue introduced in 4.19 with commit aea5f654e6b78a0c976f7a25950155932c77a53f and fixed in 5.10.236 with commit 1284733bab736e598341f1d3f3b94e2a322864a8 |
| Issue introduced in 4.19 with commit aea5f654e6b78a0c976f7a25950155932c77a53f and fixed in 5.15.180 with commit 32ee79682315e6d3c99947b3f38b078a09a66919 |
| Issue introduced in 4.19 with commit aea5f654e6b78a0c976f7a25950155932c77a53f and fixed in 6.1.134 with commit 1dcc144c322a8d526b791135604c0663f1af9d85 |
| Issue introduced in 4.19 with commit aea5f654e6b78a0c976f7a25950155932c77a53f and fixed in 6.6.87 with commit 864ca690ff135078d374bd565b9872f161c614bc |
| Issue introduced in 4.19 with commit aea5f654e6b78a0c976f7a25950155932c77a53f and fixed in 6.12.23 with commit 2f35b7673a3aa3d09b3eb05811669622ebaa98ca |
| Issue introduced in 4.19 with commit aea5f654e6b78a0c976f7a25950155932c77a53f and fixed in 6.13.11 with commit 2286770b07cb5268c03d11274b8efd43dff0d380 |
| Issue introduced in 4.19 with commit aea5f654e6b78a0c976f7a25950155932c77a53f and fixed in 6.14.2 with commit 034b293bf17c124fec0f0e663f81203b00aa7a50 |
| Issue introduced in 4.19 with commit aea5f654e6b78a0c976f7a25950155932c77a53f and fixed in 6.15 with commit ce8fe975fd99b49c29c42e50f2441ba53112b2e8 |
| |
| 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-2025-38637 |
| 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/sch_skbprio.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/7abc8318ce0712182bf0783dcfdd9a6a8331160e |
| https://git.kernel.org/stable/c/1284733bab736e598341f1d3f3b94e2a322864a8 |
| https://git.kernel.org/stable/c/32ee79682315e6d3c99947b3f38b078a09a66919 |
| https://git.kernel.org/stable/c/1dcc144c322a8d526b791135604c0663f1af9d85 |
| https://git.kernel.org/stable/c/864ca690ff135078d374bd565b9872f161c614bc |
| https://git.kernel.org/stable/c/2f35b7673a3aa3d09b3eb05811669622ebaa98ca |
| https://git.kernel.org/stable/c/2286770b07cb5268c03d11274b8efd43dff0d380 |
| https://git.kernel.org/stable/c/034b293bf17c124fec0f0e663f81203b00aa7a50 |
| https://git.kernel.org/stable/c/ce8fe975fd99b49c29c42e50f2441ba53112b2e8 |
