CVE-2024-36916
Description
In the Linux kernel, the following vulnerability has been resolved: blk-iocost: avoid out of bounds shift UBSAN catches undefined behavior in blk-iocost, where sometimes iocg->delay is shifted right by a number that is too large, resulting in undefined behavior on some architectures. [ 186.556576] ------------[ cut here ]------------ UBSAN: shift-out-of-bounds in block/blk-iocost.c:1366:23 shift exponent 64 is too large for 64-bit type 'u64' (aka 'unsigned long long') CPU: 16 PID: 0 Comm: swapper/16 Tainted: G S E N 6.9.0-0_fbk700_debug_rc2_kbuilder_0_gc85af715cac0 #1 Hardware name: Quanta Twin Lakes MP/Twin Lakes Passive MP, BIOS F09_3A23 12/08/2020 Call Trace: <IRQ> dump_stack_lvl+0x8f/0xe0 __ubsan_handle_shift_out_of_bounds+0x22c/0x280 iocg_kick_delay+0x30b/0x310 ioc_timer_fn+0x2fb/0x1f80 __run_timer_base+0x1b6/0x250 ... Avoid that undefined behavior by simply taking the "delay = 0" branch if the shift is too large. I am not sure what the symptoms of an undefined value delay will be, but I suspect it could be more than a little annoying to debug.
Predictions
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
No mitigations published for this CVE yet.
The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.
✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here withsource_tier=community-verified.
OS impact
| OS | Version | Status | Fixed in |
|---|---|---|---|
| sles | affected | | |
| debian | bookworm | fixed | 6.1.94-1 |
| debian | bullseye | fixed | 5.10.218-1 |
| debian | forky | fixed | 6.8.11-1 |
| debian | sid | fixed | 6.8.11-1 |
| debian | trixie | fixed | 6.8.11-1 |
| debian | 10.0 | affected | |
| linux-kernel | affected | 5.10.217 | |
| linux-kernel | 6.9 | affected | |
References
- https://git.kernel.org/stable/c/488dc6808cb8369685f18cee81e88e7052ac153b
- https://git.kernel.org/stable/c/62accf6c1d7b433752cb3591bba8967b7a801ad5
- https://git.kernel.org/stable/c/844fc023e9f14a4fb1de5ae1eaefafd6d69c5fa1
- https://git.kernel.org/stable/c/beaa51b36012fad5a4d3c18b88a617aea7a9b96d
- https://git.kernel.org/stable/c/ce0e99cae00e3131872936713b7f55eefd53ab86
- https://git.kernel.org/stable/c/f6add0a6f78dc6360b822ca4b6f9f2f14174c8ca
- https://lists.debian.org/debian-lts-announce/2024/06/msg00019.html
- https://security.netapp.com/advisory/ntap-20240905-0006/
- https://cert-portal.siemens.com/productcert/html/ssa-265688.html
- https://cert-portal.siemens.com/productcert/html/ssa-613116.html
- https://www.suse.com/security/cve/CVE-2024-36916.html
- https://security-tracker.debian.org/tracker/CVE-2024-36916
CWEs
CWE-125
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.