CVE-2024-36916
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…
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.73%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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.
- CVSS 3.1
- 7.1 HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
- EPSS
- 0.73% probability · 52th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-125
- Affected
- linux/linux kernel · debian/debian linux
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/488dc6808cb8369685f18cee81e88e7052ac153bPatch
- https://git.kernel.org/stable/c/62accf6c1d7b433752cb3591bba8967b7a801ad5Patch
- https://git.kernel.org/stable/c/844fc023e9f14a4fb1de5ae1eaefafd6d69c5fa1Patch
- https://git.kernel.org/stable/c/beaa51b36012fad5a4d3c18b88a617aea7a9b96dPatch
- https://git.kernel.org/stable/c/ce0e99cae00e3131872936713b7f55eefd53ab86Patch
- https://git.kernel.org/stable/c/f6add0a6f78dc6360b822ca4b6f9f2f14174c8caPatch
- https://git.kernel.org/stable/c/488dc6808cb8369685f18cee81e88e7052ac153bPatch
- https://git.kernel.org/stable/c/62accf6c1d7b433752cb3591bba8967b7a801ad5Patch
- https://git.kernel.org/stable/c/844fc023e9f14a4fb1de5ae1eaefafd6d69c5fa1Patch
- https://git.kernel.org/stable/c/beaa51b36012fad5a4d3c18b88a617aea7a9b96dPatch
- https://git.kernel.org/stable/c/ce0e99cae00e3131872936713b7f55eefd53ab86Patch
- https://git.kernel.org/stable/c/f6add0a6f78dc6360b822ca4b6f9f2f14174c8caPatch
- https://lists.debian.org/debian-lts-announce/2024/06/msg00019.htmlThird Party Advisory
- https://security.netapp.com/advisory/ntap-20240905-0006/Third Party Advisory
- https://cert-portal.siemens.com/productcert/html/ssa-265688.html
- https://cert-portal.siemens.com/productcert/html/ssa-613116.html
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.