In the Linux kernel, the following vulnerability has been resolved: net:
stmmac: protect updates of 64-bit statistics counters As explained by a
comment in <linux/u64_stats_sync.h>, write side of struct u64_stats_sync
must ensure mutual exclusion, or one seqcount update could be lost on
32-bit platforms, thus blocking readers forever. Such lockups have been
observed in real world after stmmac_xmit() on one CPU raced with
stmmac_napi_poll_tx() on another CPU. To fix the issue without introducing
a new lock, split the statics into three parts: 1. fields updated only
under the tx queue lock, 2. fields updated only during NAPI poll, 3. fields
updated only from interrupt context, Updates to fields in the first two
groups are already serialized through other locks. It is sufficient to
split the existing struct u64_stats_sync so that each group has its own.
Note that tx_set_ic_bit is updated from both contexts. Split this counter
so that each context gets its own, and calculate their sum to get the total
value in stmmac_get_ethtool_stats(). For the third group, multiple
interrupts may be processed by different CPUs at the same time, but
interrupts on the same CPU will not nest. Move fields from this group to a
newly created per-cpu struct stmmac_pcpu_stats.
git.kernel.org/linus/38cc3c6dcc09dc3a1800b5ec22aef643ca11eab8 (6.8-rc4)
git.kernel.org/stable/c/38cc3c6dcc09dc3a1800b5ec22aef643ca11eab8
git.kernel.org/stable/c/9680b2ab54ba8d72581100e8c45471306101836e
git.kernel.org/stable/c/e6af0f082a4b87b99ad033003be2a904a1791b3f
launchpad.net/bugs/cve/CVE-2024-26690
nvd.nist.gov/vuln/detail/CVE-2024-26690
security-tracker.debian.org/tracker/CVE-2024-26690
www.cve.org/CVERecord?id=CVE-2024-26690