Improper Locking Affecting kernel-syms package, versions <6.4.0-150600.23.14.2

Note: Versions mentioned in the description apply only to the upstream kernel-syms package and not the kernel-syms package as distributed by SLES. See How to fix? for SLES:15.6 relevant fixed versions and status.

In the Linux kernel, the following vulnerability has been resolved:

eth: sungem: remove .ndo_poll_controller to avoid deadlocks

Erhard reports netpoll warnings from sungem:

netpoll_send_skb_on_dev(): eth0 enabled interrupts in poll (gem_start_xmit+0x0/0x398) WARNING: CPU: 1 PID: 1 at net/core/netpoll.c:370 netpoll_send_skb+0x1fc/0x20c

gem_poll_controller() disables interrupts, which may sleep. We can't sleep in netpoll, it has interrupts disabled completely. Strangely, gem_poll_controller() doesn't even poll the completions, and instead acts as if an interrupt has fired so it just schedules NAPI and exits. None of this has been necessary for years, since netpoll invokes NAPI directly.

• https://www.suse.com/security/cve/CVE-2024-38597.html
• https://bugzilla.suse.com/1226749
• https://git.kernel.org/stable/c/476adb3bbbd7886e8251d3b9ce2d3c3e680f35d6
• https://git.kernel.org/stable/c/5de5aeb98f9a000adb0db184e32765e4815d860b
• https://git.kernel.org/stable/c/6400d205fbbcbcf9b8510157e1f379c1d7e2e937
• https://git.kernel.org/stable/c/ac0a230f719b02432d8c7eba7615ebd691da86f4
• https://git.kernel.org/stable/c/e22b23f5888a065d084e87db1eec639c445e677f
• https://git.kernel.org/stable/c/faf94f1eb8a34b2c31b2042051ef36f63420ecce
• https://git.kernel.org/stable/c/fbeeb55dbb33d562149c57e794f06b7414e44289