CVE-2024-56717 Affecting linux-6.1 package, versions <6.1.128-1~deb11u1
Threat Intelligence
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Test your applications- Snyk IDSNYK-DEBIAN11-LINUX61-9055627
- published3 Mar 2025
- disclosed29 Dec 2024
Introduced: 29 Dec 2024
CVE-2024-56717 (opens in a new tab)How to fix?
Upgrade Debian:11 linux-6.1 to version 6.1.128-1~deb11u1 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream linux-6.1 package and not the linux-6.1 package as distributed by Debian.
See How to fix? for Debian:11 relevant fixed versions and status.
In the Linux kernel, the following vulnerability has been resolved:
net: mscc: ocelot: fix incorrect IFH SRC_PORT field in ocelot_ifh_set_basic()
Packets injected by the CPU should have a SRC_PORT field equal to the CPU port module index in the Analyzer block (ocelot->num_phys_ports).
The blamed commit copied the ocelot_ifh_set_basic() call incorrectly from ocelot_xmit_common() in net/dsa/tag_ocelot.c. Instead of calling with "x", it calls with BIT_ULL(x), but the field is not a port mask, but rather a single port index.
[ side note: this is the technical debt of code duplication :( ]
The error used to be silent and doesn't appear to have other user-visible manifestations, but with new changes in the packing library, it now fails loudly as follows:
------------[ cut here ]------------ Cannot store 0x40 inside bits 46-43 - will truncate sja1105 spi2.0: xmit timed out WARNING: CPU: 1 PID: 102 at lib/packing.c:98 __pack+0x90/0x198 sja1105 spi2.0: timed out polling for tstamp CPU: 1 UID: 0 PID: 102 Comm: felix_xmit Tainted: G W N 6.13.0-rc1-00372-gf706b85d972d-dirty #2605 Call trace: __pack+0x90/0x198 (P) __pack+0x90/0x198 (L) packing+0x78/0x98 ocelot_ifh_set_basic+0x260/0x368 ocelot_port_inject_frame+0xa8/0x250 felix_port_deferred_xmit+0x14c/0x258 kthread_worker_fn+0x134/0x350 kthread+0x114/0x138
The code path pertains to the ocelot switchdev driver and to the felix secondary DSA tag protocol, ocelot-8021q. Here seen with ocelot-8021q.
The messenger (packing) is not really to blame, so fix the original commit instead.
References
- https://security-tracker.debian.org/tracker/CVE-2024-56717
- https://git.kernel.org/stable/c/2d5df3a680ffdaf606baa10636bdb1daf757832e
- https://git.kernel.org/stable/c/2f3c62ffe88116cd2a39cd73e01103535599970f
- https://git.kernel.org/stable/c/59c4ca8d8d7918eb6e2df91d2c254827264be309
- https://git.kernel.org/stable/c/a8836eae3288c351acd3b2743d2fad2a4ee2bd56