Skip to content
CVE PROGRAM SOURCE RECORD7.8 High

CVE-2022-50569

xfrm: Update ipcomp_scratches with NULL when freed

Read JSON ↗CVE.org ↗
Status
Published
Published
Updated
Assigning organization
Linux

Description

In the Linux kernel, the following vulnerability has been resolved: xfrm: Update ipcomp_scratches with NULL when freed Currently if ipcomp_alloc_scratches() fails to allocate memory ipcomp_scratches holds obsolete address. So when we try to free the percpu scratches using ipcomp_free_scratches() it tries to vfree non existent vm area. Described below: static void * __percpu *ipcomp_alloc_scratches(void) { ... scratches = alloc_percpu(void *); if (!scratches) return NULL; ipcomp_scratches does not know about this allocation failure. Therefore holding the old obsolete address. ... } So when we free, static void ipcomp_free_scratches(void) { ... scratches = ipcomp_scratches; Assigning obsolete address from ipcomp_scratches if (!scratches) return; for_each_possible_cpu(i) vfree(*per_cpu_ptr(scratches, i)); Trying to free non existent page, causing warning: trying to vfree existent vm area. ... } Fix this breakage by updating ipcomp_scrtches with NULL when scratches is freed

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < debca61df6bc2f65e020656c9c5b878d6b38d30faffected
  • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < a39f456d62810c0efb43cead22f98d95b53e4b1aaffected
  • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 1e8abde895b3ac6a368cbdb372e8800c49e73a28affected
  • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 18373ed500f7cd53e24d9b0bd0f1c09d78dba87eaffected
  • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < be81c44242b20fc3bdcc73480ef8aaee56f5d0b6affected
  • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 03155680191ef0f004b1d6a5714c5b8cd271ab61affected
  • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < f3bdba4440d82e0da2b1bfc35d3836c8a8e00677affected
  • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 2c19945ce8095d065df550e7fe350cd5cc40c6e6affected
  • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 8a04d2fc700f717104bfb95b0f6694e448a4537faffected

Linux Linux

Default version status: affected

  • 2.6.12affected
  • 0 to < 2.6.12unaffected
  • 4.9.331 to ≤ 4.9.*unaffected
  • 4.14.296 to ≤ 4.14.*unaffected
  • 4.19.262 to ≤ 4.19.*unaffected
  • 5.4.220 to ≤ 5.4.*unaffected
  • 5.10.150 to ≤ 5.10.*unaffected
  • 5.15.75 to ≤ 5.15.*unaffected
  • 5.19.17 to ≤ 5.19.*unaffected
  • 6.0.3 to ≤ 6.0.*unaffected
  • 6.1 to ≤ *unaffected

References