Description
The blk_rq_map_user_iov function in block/blk-map.c in the Linux kernel before 2.6.37-rc7 allows local users to cause a denial of service (panic) via a zero-length I/O request in a device ioctl to a SCSI device, related to an unaligned map. NOTE: this vulnerability exists because of an incomplete fix for CVE-2010-4163.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 5.0 | linux-2.6 | 2.6.26-26lenny2 | DSA-2153-1 |
| Debian 5.0 | user-mode-linux | 2.6.26-1um-2+26lenny2 | DSA-2153-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 6 | perf +14 | 2.6.32-71.14.1.el6 | RHSA-2011:0007 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Red Hat MRG 1 | perf +10 | 2.6.33.7-rt29.55.el5rt | RHSA-2011:0330 |
Advisories 3
- RHSA-2011:0007 Red Hat Security Advisory: kernel security and bug fix update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- DSA-2153-1 linux-2.6 - several issues Debian Security (DSA / DLA) · Mar 9, 2026
- RHSA-2011:0330 Red Hat Security Advisory: kernel-rt security and bug fix update Red Hat Security Advisories (RHSA) · Jan 14, 2026
References
- 45660 vdb-entry
- [oss-security] 20101130 Re: CVE request: kernel: Multiple DoS issues in block layer mailing-list
- [oss-security] 20101130 Re: CVE request: kernel: Multiple DoS issues in block layer mailing-list
- RHSA-2011:0007 vendor-advisory
- [oss-security] 20101129 Re: CVE request: kernel: Multiple DoS issues in block layer mailing-list
- [linux-kernel] 20101129 Re: [PATCH] block: check for proper length of iov entries earlier in blk_rq_map_user_iov() mailing-list
- [linux-kernel] 20101129 [PATCH] block: check for proper length of iov entries earlier in blk_rq_map_user_iov() mailing-list
- 42890 third-party-advisory
- https://patchwork.kernel.org/patch/363282/
- http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=5478755616ae2ef1ce144dded589b62b2a50d575
- http://www.kernel.org/pub/linux/kernel/v2.6/testing/ChangeLog-2.6.37-rc7
- linux-blkrqmapuseriov-dos(64496) vdb-entry