blk-iocost: avoid out of bounds shift
- Published
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Not listed in CISA KEV
- Fix
- Fixed in 5.10.217, 5.15.159, 6.1.91, 6.6.31, 6.8.10
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
- Exploitation: none
- Automatable: no
- Technical impact: partial
Summary
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.
Timeline
- CVE published
- CISA SSVC assessment
Exploitation: none · Automatable: no · Technical impact: partial
- Record last updated
Affected versions
- Linux Linux
From 5160a5a53c0c4ae3708959d9465ea43ad5d90542 · fixed in 62accf6c1d7b433752cb3591bba8967b7a801ad5; From 5160a5a53c0c4ae3708959d9465ea43ad5d90542 · fixed in 844fc023e9f14a4fb1de5ae1eaefafd6d69c5fa1; From 5160a5a53c0c4ae3708959d9465ea43ad5d90542 · fixed in f6add0a6f78dc6360b822ca4b6f9f2f14174c8ca; From 5160a5a53c0c4ae3708959d9465ea43ad5d90542 · fixed in ce0e99cae00e3131872936713b7f55eefd53ab86; From 5160a5a53c0c4ae3708959d9465ea43ad5d90542 · fixed in 488dc6808cb8369685f18cee81e88e7052ac153b; From 5160a5a53c0c4ae3708959d9465ea43ad5d90542 · fixed in beaa51b36012fad5a4d3c18b88a617aea7a9b96d
- Linux Linux
5.10
- KernelLinux
From 5.10.0 · fixed in 5.10.217; From 5.11.0 · fixed in 5.15.159; From 5.16.0 · fixed in 6.1.91; From 6.2.0 · fixed in 6.6.31; From 6.7.0 · fixed in 6.8.10